Home ReviewsRefund
Home/Acura/TL/Acura TL III (2003-2006)/Repair manual/Testing & Diagnostics/Pgm-Fi System
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Pgm-Fi System Acura TL III

Testing & Diagnostics 349 illustrations ~59495 words

Scheme 1

Scheme 1: Component Location Index
Scheme 1: Component Location Index

Scheme 2

Scheme 2
Scheme 2

DTC Troubleshooting

DTCDescription
DTC P0107MAP Sensor Circuit Low Voltage (2004-2005 models)
DTC P0107MAP Sensor Circuit Low Voltage (2006 model)
DTC P0108MAP Sensor Circuit High Voltage (2004-2005 models)
DTC P0108MAP Sensor Circuit High Voltage (2006 model)
DTC P0111IAT Sensor Circuit Range/Performance Problem (2006 model)
DTC P1116ECT Sensor Circuit Range/Performance Problem (2006 model)
DTC P0112IAT Sensor Circuit Low Voltage
DTC P0113IAT Sensor Circuit High Voltage (2004-2005 models)
DTC P0113IAT Sensor Circuit High Voltage (2006 model)
DTC P0116ECT Sensor Circuit Range/Performance Problem (2004-2005 models)
DTC P0116ECT Sensor Circuit Range/Performance Problem (2006 model)
DTC P0117ECT Sensor Circuit Low Voltage
DTC P0118ECT Sensor Circuit High Voltage (2004-2005 models)
DTC P0118ECT Sensor Circuit High Voltage (2006 model)
DTC P0125ECT Sensor Malfunction/Slow Response (2004-2005 models)
DTC P0125ECT Sensor Malfunction/Slow Response (2006 model)
DTC P0128Cooling System Malfunction
DTC P0133Rear A/F Sensor (Bank 1, Sensor 1) Slow Response (2004 model)
DTC P0153Front A/F Sensor (Bank 2, Sensor 1) Slow Response (2004 model)
DTC P0133Rear A/F Sensor (Bank 1, Sensor 1) Slow Response (2005-2006 models)
DTC P0153Front A/F Sensor (Bank 2, Sensor 1) Slow Response (2005-2006 models)
DTC P0134Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2004-2005 models)
DTC P0154Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction (2004-2005 models)
DTC P0134Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2006 model)
DTC P0154Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction (2006 model)
DTC P0135Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2004-2005 models)
DTC P0155Front A/F Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction (2004-2005 models)
DTC P0135Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2006 model)
DTC P0155Front A/F Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction (2006 model)
DTC P0137Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2004 model)
DTC P0157Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage (2004 model)
DTC P0137Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2005-2006 models)
DTC P0157Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage (2005-2006 models)
DTC P0138Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2004 model)
DTC P0158Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2004 model)
DTC P0138Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2005 model)
DTC P0158Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2005 model)
DTC P0138Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2006 model)
DTC P0158Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2006 model)
DTC P0139Rear Secondary HO2S (Bank 1, Sensor 2) Slow Response (2004 model)
DTC P0159Front Secondary HO2S (Bank 2, Sensor 2) Slow Response (2004 model)
DTC P0139Rear Secondary HO2S (Bank 1, Sensor 2) Slow Response (2005-2006 models)
DTC P0159Front Secondary HO2S (Bank 2, Sensor 2) Slow Response (2005-2006 models)
DTC P0141Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2004-2005 models)
DTC P0161Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction (2004-2005 models)
DTC P0141Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2006 model)
DTC P0161Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction (2006 model)
DTC P0171Rear Bank (Bank 1) Fuel System Too Lean
DTC P0172Rear Bank (Bank 1) Fuel System Too Rich
DTC P0174Front Bank (Bank 2) Fuel System Too Lean
DTC P0175Front Bank (Bank 2) Fuel System Too Rich
DTC P0300Random Misfire and Any Combination of the Following
DTC P0301No. 1 Cylinder Misfire Detected
DTC P0302No. 2 Cylinder Misfire Detected
DTC P0303No. 3 Cylinder Misfire Detected
DTC P0304No. 4 Cylinder Misfire Detected
DTC P0305No. 5 Cylinder Misfire Detected
DTC P0306No. 6 Cylinder Misfire Detected
DTC P0301No. 1 Cylinder Misfire Detected (2004-2005 models)
DTC P0302No. 2 Cylinder Misfire Detected (2004-2005 models)
DTC P0303No. 3 Cylinder Misfire Detected (2004-2005 models)
DTC P0304No. 4 Cylinder Misfire Detected (2004-2005 models)
DTC P0305No. 5 Cylinder Misfire Detected (2004-2005 models)
DTC P0306No. 6 Cylinder Misfire Detected (2004-2005 models)
DTC P0301No. 1 Cylinder Misfire Detected (2006 model)
DTC P0302No. 2 Cylinder Misfire Detected (2006 model)
DTC P0303No. 3 Cylinder Misfire Detected (2006 model)
DTC P0304No. 4 Cylinder Misfire Detected (2006 model)
DTC P0305No. 5 Cylinder Misfire Detected (2006 model)
DTC P0306No. 6 Cylinder Misfire Detected (2006 model)
DTC P0325Knock Sensor Circuit Malfunction
DTC P0335CKP Sensor A No Signal (2004-2005 models)
DTC P0385CKP Sensor B No Signal (2004-2005 models)
DTC P0335CKP Sensor A No Signal (2006 model)
DTC P0385CKP Sensor B No Signal (2006 model)
DTC P0339CKP Sensor A Circuit Intermittent Interruption
DTC P0389CKP Sensor B Circuit Intermittent Interruption
DTC P0340CMP Sensor No Signal (2004-2005 Models)
DTC P0340CMP Sensor No Signal (2006 Model)
DTC P0344CMP Sensor Circuit Intermittent Interruption
DTC P0562Charging System Low Voltage (2006 Model)
DTC P0563ECM/PCM Power Source Circuit Unexpected Voltage
DTC P0563ECM/PCM Power Source Circuit Unexpected Voltage (2006 Model)
DTC P0603ECM/PCM Internal Circuit Malfunction (Keep Alive Memory (KAM) Error)
DTC P0630VIN Not Programmed or Mismatch (2005-2006 Models)
DTC P0685ECM/PCM Internal Circuit Malfunction (Power Control Circuit)
DTC P0700A/T Control System Malfunction
DTC P0715Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)
DTC P0715Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)
DTC P0720Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)
DTC P0720Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)
DTC P1109BARO Sensor Circuit Out of Range High (2005-2006 Models)
DTC P1128MAP Sensor Circuit Lower Than Expected
DTC P1129MAP Sensor Circuit Higher Than Expected
DTC P1172, P1174Rear A/F Sensor (Bank 1, Sensor 1) Circuit Out of Range High (2005-2006 Models); Front A/F Sensor (Bank 2, Sensor 1) Circuit Out of Range High (2005-2006 Models)
DTC P1297ELD Circuit Low Voltage (2004-2005 Models)
DTC P1297ELD Circuit Low Voltage (2006 Model)
DTC P1298ELD Circuit High Voltage (2004-2005 Models)
DTC P1298ELD Circuit High Voltage (2006 Model)
DTC P1549Charging System High Voltage (2006 Model)
DTC P16BBAlternator B Terminal Circuit Low Voltage (2006 Model)
DTC P16BCAlternator FR Terminal Circuit/IGP Circuit Low Voltage (2006 Model)
DTC P2195, P2197Rear A/F Sensor (Bank 1, Sensor 1) Signal Stuck Lean; Front A/F Sensor (Bank 2, Sensor 1) Signal Stuck Lean
DTC P2227BARO Sensor Circuit Range/Performance Problem
DTC P2228BARO Sensor Circuit Low Voltage
DTC P2229BARO Sensor Circuit High Voltage
DTC P2237, P2240Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit High Voltage (2004-2005 Models)
DTC P2237, 2240Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit High Voltage (2006 Model)
DTC P2238, P2241Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit Low Voltage (2004-2005 Models)
DTC P2238, P2241Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit Low Voltage (2006 Model)
DTC P2243, P2247Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models)
DTC P2243, P2247Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage (2006 Model)
DTC P2245, P2249Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models)
DTC P2245, P2249Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit Low Voltage (2006 Model)
DTC P2251, P2254Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit High Voltage (2004-2005 Models)
DTC P2251, P2254Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit High Voltage (2006 Model)
DTC P2252, P2255Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2004-2005 models); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit Low Voltage (2004-2005 models)
DTC P2252, P2255Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit Low Voltage (2006 Model)
DTC P2270, P2271, P2272, P2273Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean (2005-2006 Models); Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Rich (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Rich (2005-2006 Models)
DTC P2610ECM/PCM Ignition Off Internal Timer Malfunction (2006 Model)
DTC P2627, P2630Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models)
DTC P2627, P2630Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage (2006 Model)
DTC P2628, P2631Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models)
DTC P2628, P2631Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage (2006 Model)
DTC P2A00, P2A03Rear A/F Sensor (Bank 1, Sensor 1) Circuit Range/Performance Problem; Front A/F Sensor (Bank 2, Sensor 1) Circuit Range/Performance Problem
DTC U0073, U0155F-CAN Malfunction (BUS-OFF) (2004-2005 Models); F-CAN Malfunction (Gauge Control Module-ECM/PCM) (2004-2005 Models)
DTC U0073, U0155F-CAN Malfunction (BUS-OFF) (2006 Model); F-CAN Malfunction (Gauge Control Module-ECM/PCM) (2006 Model)
DTC U0122F-CAN Malfunction (VSA-ECM/PCM) (2004-2005 Models)
DTC U0122F-CAN Malfunction (VSA-ECM/PCM) (2006 Model)

DTC TROUBLESHOOTING INDEX

DTC P0107: MAP Sensor Circuit Low Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 3

Scheme 3: DTC P0107: MAP Sensor Circuit Low Voltage (2004-2005 Models)
Scheme 3: DTC P0107: MAP Sensor Circuit Low Voltage (2004-2005 Models)

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5
  1. Turn the ignition switch ON (II).
  2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the MAP sensor 3P connector.
  5. Turn the ignition switch ON (II).
  6. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less indicated? YES - Go to step 9 . NO - Go to step 7 .
  7. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 13 . NO - Go to step 8 .
  8. Measure voltage between ECM/PCM connector terminals D4 and D6. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D6) and the MAP sensor, then go to step 15 . NO - Go to step 20 .
  9. Turn the ignition switch OFF.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector D (17P).
  12. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D5) and the MAP sensor, then go to step 15 . NO - Go to step 20 .
  13. Turn the ignition switch OFF.
  14. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0107 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0107 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0107: MAP Sensor Circuit Low Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 6

Scheme 6: DTC P0107: MAP Sensor Circuit Low Voltage (2006 Model)
Scheme 6: DTC P0107: MAP Sensor Circuit Low Voltage (2006 Model)

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8
  1. Turn the ignition switch ON (II).
  2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the MAP sensor 3P connector.
  5. Turn the ignition switch ON (II).
  6. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less indicated? YES - Go to step 9 . NO - Go to step 7 .
  7. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 13 . NO - Go to step 8 .
  8. Measure voltage between ECM/PCM connector terminals C4 and C6. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (C6) and the MAP sensor, then go to step 15 . NO - Go to step 20 .
  9. Turn the ignition switch OFF.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector C (22P).
  12. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C5) and the MAP sensor, then go to step 15 . NO - Go to step 20 .
  13. Turn the ignition switch OFF.
  14. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0107 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0107 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0108: MAP Sensor Circuit High Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 9

Scheme 9: DTC P0108: MAP Sensor Circuit High Voltage (2004-2005 Models)
Scheme 9: DTC P0108: MAP Sensor Circuit High Voltage (2004-2005 Models)

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13
  1. Turn the ignition switch ON (II).
  2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the MAP sensor 3P connector.
  5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 8 . NO - Go to step 19 .
  8. Remove the jumper wire from the MAP sensor 3P connector.
  9. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 15 . NO - Go to step 10 .
  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector D (17P).
  13. Connect MAP sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM/PCM connector terminal D4 and body ground. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the ECM/PCM (D4) and the MAP sensor, then go to step 21 .
  15. Turn the ignition switch OFF.
  16. Connect ECM/PCM connector terminals D4 and D5 with a jumper wire.
  17. Turn the ignition switch ON (II).
  18. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 26 . NO - Repair open in the wire between the ECM/PCM (D5) and the MAP sensor, then go to step 21 .
  19. Turn the ignition switch OFF.
  20. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0108 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0108 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0108: MAP Sensor Circuit High Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 14

Scheme 14: DTC P0108: MAP Sensor Circuit High Voltage (2006 Model)
Scheme 14: DTC P0108: MAP Sensor Circuit High Voltage (2006 Model)

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17

Scheme 18

Scheme 18
Scheme 18
  1. Turn the ignition switch ON (II).
  2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the MAP sensor 3P connector.
  5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 8 . NO - Go to step 19 .
  8. Remove the jumper wire from the MAP sensor 3P connector.
  9. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 15 . NO - Go to step 10 .
  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector C (22P).
  13. Connect MAP sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM/PCM connector terminal C4 and body ground. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the ECM/PCM (C4) and the MAP sensor, then go to step 21 .
  15. Turn the ignition switch OFF.
  16. Connect ECM/PCM connector terminals C4 and C5 with a jumper wire.
  17. Turn the ignition switch ON (II).
  18. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 26 . NO - Repair open in the wire between the ECM/PCM (C5) and the MAP sensor, then go to step 21 .
  19. Turn the ignition switch OFF.
  20. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0108 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0108 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0111, P1116: IAT Sensor Circuit Range/Performance Problem (2006 Model); ECT Sensor Circuit Range/Performance Problem (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Check for poor connections or loose terminals at the ECT sensor and the IAT sensor. Are the connections and terminals OK? YES - Go to step 2 . NO - Repair the connectors or terminals, then go to step 25 .
  2. Start the engine, and let it idle for 10 minutes.
  3. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 129°F (54°C) or less, or 1.54 V or more indicated? YES - Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 . NO - Go to step 4 .
  4. Turn the ignition switch OFF.
  5. Remove the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  6. Allow the IAT sensor to cool ambient temperature.
  7. Note the ambient temperature.
  8. Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
  9. Turn the ignition switch ON (II).
  10. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
  11. Compare the IAT SENSOR and the ambient temperature. Does the IAT SENSOR differ 5.4°F (3°C) or more? YES - Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 . NO - Go to step 12 .
  12. Disconnect the IAT sensor from the 2P connector.
  13. Using a heat gun, blow hot air on the IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
  14. Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
  15. Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 82°F (28°C) or more? YES - Go to step 16 . NO - Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 .
  16. Turn the ignition switch OFF.
  17. Drain the coolant (see «COOLANT CHECK»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ).
  18. Remove the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  19. Allow the ECT sensor to cool to ambient temperature.
  20. Note the ambient temperature.
  21. Connect the ECT sensor to its 2P connector, but do not install it on the engine.
  22. Turn the ignition switch ON (II).
  23. Note the value of the value of ECT SENSOR quickly in the DATA LIST with the HDS.
  24. Compare the value of the ECT SENSOR and the ambient temperature. Does the ECT SENSOR differ 5.4°F (3°C) or more? YES - Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  25. Turn the ignition switch ON (II).
  26. Reset the ECM/PCM with the HDS.
  27. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0111 and/or P1116 is indicated, check for poor connections or loose terminals at the ECT sensor, or the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P0112: IAT Sensor Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 19

Scheme 19: DTC P0112: IAT Sensor Circuit Low Voltage
Scheme 19: DTC P0112: IAT Sensor Circuit Low Voltage
  1. Turn the ignition switch ON (II).
  2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the IAT sensor 2P connector.
  5. Turn the ignition switch ON (II).
  6. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7 . NO - Go to step 11 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector D (17P) (2004-2005 models), A (31P) (2006 model).
  10. Check for continuity between IAT sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the IAT sensor and the ECM/PCM (D16 (2004-2005 models)), (A5 (2006 model)), then go to step 13 . NO - Go to step 18 .
  11. Turn the ignition switch OFF.
  12. Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) .
  13. Reconnect all connectors.
  14. Turn the ignition switch ON (II).
  15. Reset the ECM/PCM with the HDS.
  16. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  17. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  18. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0113: IAT Sensor Circuit High Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 20

Scheme 20: DTC P0113: IAT Sensor Circuit High Voltage (2004-2005 Models)
Scheme 20: DTC P0113: IAT Sensor Circuit High Voltage (2004-2005 Models)

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22

Scheme 23

Scheme 23
Scheme 23

Scheme 24

Scheme 24
Scheme 24
  1. Turn the ignition switch ON (II).
  2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the IAT sensor 2P connector.
  5. Connect IAT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 8 . NO - Go to step 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between IAT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 17 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector D (17P).
  15. Connect IAT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  16. Check for continuity between ECM/PCM connector terminal D10 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (D10) and the IAT sensor, then go to step 20 .
  17. Measure voltage between ECM/PCM connector terminal D16 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D16) and the IAT sensor, then go to step 20 . NO - Go to step 25 .
  18. Turn the ignition switch OFF.
  19. Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0113: IAT Sensor Circuit High Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 25

Scheme 25: DTC P0113: IAT Sensor Circuit High Voltage (2006 Model)
Scheme 25: DTC P0113: IAT Sensor Circuit High Voltage (2006 Model)

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29
  1. Turn the ignition switch ON (II).
  2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (- 40°C) or less, or 4.90 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the IAT sensor 2P connector.
  5. Connect IAT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 8 . NO - Go to step 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between IAT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 17 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector C (22P).
  15. Connect IAT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  16. Check for continuity between ECM/PCM connector terminal C12 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (C12) and the IAT sensor, then go to step 20 .
  17. Measure voltage between ECM/PCM connector terminal A5 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A5) and the IAT sensor, then go to step 20 . NO - Go to step 25 .
  18. Turn the ignition switch OFF.
  19. Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0116: ECT Sensor Circuit Range/Performance Problem (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 176°F (80°C) or more, or 0.86 V or less indicated? YES - Go to step 3 . NO - Go to step 7 .
  3. Note the current coolant temperature.
  4. Turn the ignition switch OFF.
  5. Let the engine cool off for 1 hour.
  6. Check the ECT SENSOR in the DATA LIST with the HDS. Did the ECT change 3.6°F (2°C) or more? YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system (see «FAN MOTOR TEST»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) . NO - Go to step 10 .
  7. Note the current coolant temperature.
  8. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  9. Check the ECT SENSOR in the DATA LIST with the HDS. Does the ECT change 3.6°F (2°C) or more? YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system (see «FAN MOTOR TEST»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ). NO - Go to step 10 .
  10. Turn the ignition switch OFF.
  11. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  12. Turn the ignition switch ON (II).
  13. Reset the ECM/PCM with the HDS.
  14. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  15. Allow the engine to cool to between 23°F (-5°C) and 77°F (25°C).
  16. Start the engine, and let it idle 20 minutes.
  17. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0116 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 18 .
  18. Monitor the OBD STATUS for DTC P0116 in the DTCs MENU with the HDS. Does the screen indicate PASSED YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 15 and recheck.

DTC P0116: ECT Sensor Circuit Range/Performance Problem (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 176°F (80°C) or more, or 0.78 V or less indicated? YES - Go to step 6 . NO - Go to step 3 .
  3. Note the value of the ECT SENSOR in the DATA LIST with the HDS.
  4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  5. Check the ECT SENSOR in the DATA LIST with the HDS. Did the ECT SENSOR change 18°F (10°C) or more? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM. NO - Go to step 11 .
  6. Note the value of the ECT SENSOR in the DATA LIST with the HDS.
  7. Turn the ignition switch OFF.
  8. Open the engine hood, and let the engine cool for 3 hours.
  9. Turn the ignition switch ON (II).
  10. Check the ECT SENSOR in the DATA LIST with the HDS. Did the ECT SENSOR change 18°F (10°C) or more? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM. NO - Go to step 11 .
  11. Turn the ignition switch OFF.
  12. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  16. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0116 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC P0117: ECT Sensor Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 30

Scheme 30: DTC P0117: ECT Sensor Circuit Low Voltage
Scheme 30: DTC P0117: ECT Sensor Circuit Low Voltage
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less Indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Turn the ignition switch ON (II).
  6. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7 . NO - Go to step 11 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector D (17P) (2004-2005 models), A (31P) (2006 model).
  10. Check for continuity between ECT sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the ECT sensor and the ECM/PCM (D17 (2004-2005 models)), (A14 (2006 model)), then go to step 13 . NO - Go to step 18 .
  11. Turn the ignition switch OFF.
  12. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  13. Reconnect all connectors.
  14. Turn the ignition switch ON (II).
  15. Reset the ECM/PCM with the HDS.
  16. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  17. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  18. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0118: ECT Sensor Circuit High Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 31

Scheme 31: DTC P0118: ECT Sensor Circuit High Voltage (2004-2005 Models)
Scheme 31: DTC P0118: ECT Sensor Circuit High Voltage (2004-2005 Models)

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 8 . NO - Go to step 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between ECT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 17 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector D (17P).
  15. Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  16. Check for continuity between ECM/PCM connector terminal D10 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (D10) and the ECT sensor, then go to step 20 .
  17. Measure voltage between ECM/PCM connector terminal D17 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D17) and the ECT sensor, then go to step 20 . NO - Go to step 25 .
  18. Turn the ignition switch OFF.
  19. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0118: ECT Sensor Circuit High Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 36

Scheme 36: DTC P0118: ECT Sensor Circuit High Voltage (2006 Model)
Scheme 36: DTC P0118: ECT Sensor Circuit High Voltage (2006 Model)

Scheme 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40 °C) or less, or 4.90 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 8 . NO - Go to step 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between ECT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 17 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector C (22P).
  15. Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  16. Check for continuity between ECM/PCM connector terminal C12 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (C12) and the ECT sensor, then go to step 20 .
  17. Measure voltage between ECM/PCM connector terminal A14 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A14) and the ECT sensor, then go to step 20 . NO - Go to step 25 .
  18. Turn the ignition switch OFF.
  19. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0125: ECT Sensor Malfunction/Slow Response (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Start the engine, and let it idle.
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 86°F (30°C) or less, or 2.61 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
  3. Let the engine idle 6 minutes.
  4. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 86°F (30°C) or less, or 2.61 V or more indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
  5. Turn the ignition switch OFF.
  6. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  7. Turn the ignition switch ON (II).
  8. Reset the ECM/PCM with the HDS.
  9. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  10. Allow the engine to cool to between 23°F (-5°C) and 77°F (25°C).
  11. Start the engine, and let it idle 20 minutes.
  12. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0125 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 13 .
  13. Monitor the OBD STATUS for DTC P0125 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 10 . and recheck.

DTC P0125: ECT Sensor Malfunction/Slow Response (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Start the engine, and let it idle for 5 minutes or more.
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 10°F (-12°C) or less, or 4.45 V or higher indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  5. Turn the ignition switch ON (II).
  6. Reset the ECM/PCM with the HDS.
  7. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  8. Allow the engine to cool to outside temperature.
  9. Start the engine, and let it idle for 20 minutes.
  10. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0125 is indicated, check for poor connections or loose terminals at the ECT sensor, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 11 .
  11. Monitor the OBD STATUS for DTC P0125 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 8 . and recheck.

DTC P0128: Cooling System Malfunction

Note. If any of the DTCs listed below are stored at the same time as DTC P0128, troubleshoot those DTCs first, then recheck for P0128. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

P0112, P0113: Intake air temperature (IAT) sensor

P0116, P0117, P0118: Engine coolant temperature (ECT) sensor

P0300: Random misfire

P0301, P0302, P0303, P0304, P0305, P0306: No. 1, No. 2, No. 3, No. 4, No. 5, or No. 6 Cylinder misfire

P0335, P0339: Crankshaft position (CKP) sensor A

P0385, P0389: Crankshaft position (CKP) sensor B

P2227, P2228, P2229: Barometric pressure (BARO) sensor

P2646, P2647, P2648, P2649: VTEC system

P0506, P0507: Idle control system malfunction

DTC P0128 can occasionally set when the hood is opened while the engine is running.

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the blower switch OFF.
  4. Turn the A/C switch OFF.
  5. Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES - Go to step 6 . NO - Wait until the FAN CTRL is turned off, then go to step 6 .
  6. Check the ECT SENSOR in the DATA LIST with the HDS, then check the radiator fan operation. Does the radiator fan keep running when the engine coolant temperature is less than 158°F (70°C)? YES - Check the radiator fan low speed circuit (see «RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__radiator-and-ac-condenser-fan-low) ), the radiator fan high speed circuit (see «RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/cooling-fan/#fan-controls) ), and the radiator fan relay (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). If the circuits and the relay are OK, go to step 21 . NO - Go to step 7 .
  7. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  8. Turn the ignition switch OFF.
  9. Turn the ignition switch ON (II).
  10. Do the RADIATOR FAN TEST in the INSPECTION MENU with the HDS for 20 minutes.
  11. Check the ECT SENSOR in the DATA LIST with the HDS. Is about 140°F (60°C) or less, or 1.25 V or more indicated? YES - Intermittent failure, system is OK at this time. NO - Go to step 12 .
  12. Turn the ignition switch OFF.
  13. Cool down the engine until the coolant temperature is between 23°F (-5°C) and 95°F (35°C).
  14. Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ).
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  18. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0128 is indicated, check the cooling system, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check the cooling system, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) .
  22. Cool down the engine until the coolant temperature is between 23°F (-5°C) and 95°F (35°C).
  23. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0128 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0133, P0153: Rear A/F Sensor (Bank 1, Sensor 1) Slow Response (2004 Model); Front A/F Sensor (Bank 2, Sensor 1) Slow Response (2004 Model)

Note. If DTC P0139 and/or P0159* is stored at the same time as DTC P0133 and/or P0153*, troubleshoot DTC P0139 and/or P0159* first, then recheck for DTC P0133 and/or P0153*. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 5th gear) Vehicle speed at 30 mph (48 km/h) or more, and engine speed between 1,350 and 2,350 rpm
  5. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  11. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 5th gear) Vehicle speed at 30 mph (48 km/h) or more, and engine speed between 1,350 and 2,350 rpm
  12. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0133 and/or P0153* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 13 .
  13. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 . and recheck.

DTC P0133, P0153: Rear A/F Sensor (Bank 1, Sensor 1) Slow Response (2005-2006 Models); Front A/F Sensor (Bank 2, Sensor 1) Slow Response (2005-2006 Models)

Note. If DTC P0139 and/or P0159* is stored at the same time as DTC P0133 and/or P0153*, troubleshoot DTC P0139 and/or P0159* first, then recheck for DTC P0133 and/or P0153*. Information marked with an asterisk (*) applies to the front bank. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 5th gear) Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h)
  5. Monitor the OBD STATUS for DTC P0133 and/or P01531 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 . and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .)
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 5th gear) Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h)
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0133 and/or P0153* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 14 .
  14. Monitor the OBD STATUS for DTC P0133 and/or P01531 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 . and recheck.

DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction (2004-2005 Models)

Note. If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 41

Scheme 41: DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2004-2005 Models); F
Scheme 41: DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2004-2005 Models); F

Scheme 42

Scheme 42
Scheme 42

Scheme 43

Scheme 43
Scheme 43
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B12 (B20)* and D10. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .)
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs Indicated? YES - If DTC P0134 and/or P0154* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0134 and/or P0154* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was update, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2006 Model), Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction (2006 Model)

Note. If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 44

Scheme 44: DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2006 Model), Front A
Scheme 44: DTC P0134, P0154: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction (2006 Model), Front A

Scheme 45

Scheme 45
Scheme 45

Scheme 46

Scheme 46
Scheme 46
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B12 (B20)* and C12. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .)
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0134 and/or P0154* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0134 and/or P0154* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was update, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 47

Scheme 47: DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2004-2005 Models);
Scheme 47: DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2004-2005 Models);

Scheme 48

Scheme 48
Scheme 48

Scheme 49

Scheme 49
Scheme 49

Scheme 50

Scheme 50
Scheme 50

Scheme 51

Scheme 51
Scheme 51

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53
Scheme 53

Scheme 54

Scheme 54
Scheme 54

Scheme 55

Scheme 55
Scheme 55

Scheme 56

Scheme 56
Scheme 56
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Check these fuses: No. 19 Fl ECU (ECM/PCM) (40 A) fuse in the under-hood fuse/relay box. No. 4 LAF (A/F SENSOR) (15 A) fuse in the under-dash fuse/relay box. No. 23 IGP (7.5 A) fuse in the under-dash fuse/relay box. Are any of the fuses blown? YES - Repair short in the wire between the A/F sensors, the secondary HO2S, the A/F sensor relay (LAF), and the fuses, then replace the blown fuse(s), and go to step 23 . NO - Go to step 7 .
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. At the sensor side, measure resistance between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 2. Is there 2.5-3.2 ohms at room temperature? YES - Go to step 9 . NO - Go to step 22 .
  9. At the sensor side, check for continuity between each terminal at the A/F sensor (Sensor 1) 8P connector and body ground. Is there continuity? YES - Go to step 22 . NO - Go to step 10 .
  10. At the sensor side, check for continuity between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 3, No. 4, No. 6, No. 7, and No. 8 individually. Is there continuity? YES - Go to step 22 . NO - Go to step 11 .
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector E (31P).
  13. Check for continuity between ECM/PCM connector terminal E7 (E6)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E7 (E6)*) and the A/F sensor (Sensor 1), then go to step 23 . NO - Go to step 14 .
  14. Connect A/F sensor (Sensor 1) 8P connector terminal No. 2 to body ground with a jumper wire.
  15. Check for continuity between ECM/PCM connector terminal E7 (E6)* and body ground. Is there continuity? YES - Go to step 16 . NO - Repair open in the wire between the ECM/PCM (E7 (E6)*) and the A/F sensor (Sensor 1), then go to step 23 .
  16. Connect A/F sensor (Sensor 1) 8P connector terminal No. 1 to body ground with a jumper wire.
  17. Remove the A/F sensor relay (LAF) (A).
  18. Check for continuity between A/F sensor relay (LAF) 4P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay (LAF), then go to step 23 .
  19. Disconnect ECM/PCM connector A (31P).
  20. Check for continuity between ECM/PCM connector terminal A4 and A/F sensor relay (LAF) 4P connector terminal No. 4. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the ECM/PCM (A4) and the A/F sensor relay (LAF), then go to step 23 .
  21. Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay (LAF) OK? YES - Go to step 29 . NO - Replace the A/F sensor relay (LAF), then go to step 23 .
  22. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  23. Reconnect all connectors.
  24. Turn the ignition switch ON (II).
  25. Reset the ECM/PCM with the HDS.
  26. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0135 and/or P0155* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0135 and/or P0155* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 26 and recheck.
  29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0135 and/or P0155* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION .

Scheme 57

Scheme 57: DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2006 Model); Front
Scheme 57: DTC P0135, P0155: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction (2006 Model); Front

Scheme 58

Scheme 58
Scheme 58

Scheme 59

Scheme 59
Scheme 59

Scheme 60

Scheme 60
Scheme 60

Scheme 61

Scheme 61
Scheme 61

Scheme 62

Scheme 62
Scheme 62

Scheme 63

Scheme 63
Scheme 63

Scheme 64

Scheme 64
Scheme 64

Scheme 65

Scheme 65
Scheme 65

Scheme 66

Scheme 66
Scheme 66
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Check these fuses: No. 19 Fl ECU (ECM/PCM) (40 A) fuse in the under-hood fuse/relay box. No. 4 LAF (A/F SENSOR) (15 A) fuse in the under-dash fuse/relay box. No. 23 IGP (7.5 A) fuse in the under-dash fuse/relay box. Are any of the fuses blown? YES - Repair short in the wire between the A/F sensors, the secondary HO2S, the A/F sensor relay (LAF), and the fuses, then replace the blown fuse(s), and go to step 23 . NO - Go to step 7 .
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. At the sensor side, measure resistance between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 2. Is there 2.5-3.2 ohms at room temperature? YES - Go to step 9 . NO - Go to step 22 .
  9. At the sensor side, check for continuity between each terminal at the A/F sensor (Sensor 1) 8P connector and body ground. Is there continuity? YES - Go to step 22 . NO - Go to step 10 .
  10. At the sensor side, check for continuity between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 3, No. 4, No. 6, No. 7 and No. 8 individually. Is there continuity? YES - Go to step 22 . NO - Go to step 11 .
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector A (31P).
  13. Check for continuity between ECM/PCM connector terminal A7 (A6)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A7 (A6)*) and the A/F sensor (Sensor 1), then go to step 23 . NO - Go to step 14 .
  14. Connect A/F sensor (Sensor 1) 8P connector terminal No. 2 to body ground with a jumper wire.
  15. Check for continuity between ECM/PCM connector terminal A7 (A6)* and body ground. Is there continuity? YES - Go to step 16 . NO - Repair open in the wire between the ECM/PCM (A7 (A6)*) and the A/F sensor (Sensor 1), then go to step 23 .
  16. Connect A/F sensor (Sensor 1) 8P connector terminal No. 1 to body ground with a jumper wire.
  17. Remove the A/F sensor relay (LAF) (A).
  18. Check for continuity between A/F sensor relay (LAF) 4P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay (LAF), then go to step 23 .
  19. Disconnect ECM/PCM connector E (31P).
  20. Check for continuity between ECM/PCM connector terminal E4 and A/F sensor relay (LAF) 4P connector terminal No. 4. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the ECM/PCM (E4) and the A/F sensor relay (LAF), then go to step 23 .
  21. Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay (LAF) OK? YES - Go to step 29 . NO - Replace the A/F sensor relay (LAF), then go to step 23 .
  22. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .)
  23. Reconnect all connectors.
  24. Turn the ignition switch ON (II).
  25. Reset the ECM/PCM with the HDS.
  26. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0135 and/or P0155* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0135 and/or P0155* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 26 and recheck.
  29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0135 and/or P0155* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2004 Model); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage (2004 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 67

Scheme 67: DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2004 Model); Front Sec
Scheme 67: DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2004 Model); Front Sec
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.29 V or less for 1 minute or more? YES - Go to step 5 . NO - Go to step 1 .
  5. Turn the ignition switch OFF.
  6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  7. Turn the ignition switch ON (II).
  8. Check the HO2S S2 in the DATA LIST with the HDS. Is there about 0.29 V or less? YES - Go to step 11 . NO - Go to step 15 .
  9. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  10. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 15 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 9 and recheck.
  11. Turn the ignition switch OFF.
  12. Jump the SCS line with the HDS.
  13. Disconnect ECM/PCM connector B (24P).
  14. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 17 . NO - Go to step 24 .
  15. Turn the ignition switch OFF.
  16. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  17. Turn the ignition switch ON (II).
  18. Reset the ECM/PCM with the HDS.
  19. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  20. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  21. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0137 and/or P0157* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 23 .
  23. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 20 and recheck.
  24. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  25. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  26. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0137 and/or P0157* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage (2005-2006 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 68

Scheme 68: DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2005-2006 Models); Fro
Scheme 68: DTC P0137, P0157: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage (2005-2006 Models); Fro
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.29 V or less? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  7. Turn the ignition switch ON (II).
  8. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.29 V or less? YES - Go to step 9 . NO - Go to step 13 .
  9. Turn the ignition switch OFF.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector B (24P).
  12. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 15 . NO - Go to step 23 .
  13. Turn the ignition switch OFF.
  14. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  20. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drive 1 minute or more
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0137 and/or P0157* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 22 .
  22. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 19 . and recheck.
  23. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  24. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  25. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drivel minute or more
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0137 and/or P0157* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2004 Model); Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2004 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 69

Scheme 69: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2004 Model); Front Se
Scheme 69: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2004 Model); Front Se

Scheme 70

Scheme 70
Scheme 70

Scheme 71

Scheme 71
Scheme 71

Scheme 72

Scheme 72
Scheme 72
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.75 V or more for 1 minute or more? YES - Go to step 7 . NO - Go to step 5 .
  5. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (MAT in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  6. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 19 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 5 . and recheck.
  7. Turn the ignition switch OFF.
  8. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  9. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
  10. Turn the ignition switch ON (II).
  11. Check the HO2S S2 in the DATA LIST with the HDS. Is there about 0.75 V or more? YES - Go to step 12 . NO - Go to step 19 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connectors B (24P) and D (17P).
  15. Check for continuity between ECM/PCM connector terminals D10 and B9 (B18)*. Is there continuity? YES - Go to step 28 . NO - Go to step 16 .
  16. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
  17. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
  18. Check for continuity between ECM/PCM connector terminal B9 (B18)* and body ground. Is there continuity? YES - Repair open in the wire between the ECM/PCM (D10) and the secondary HO2S (Sensor 2), then go to step 21 . NO - Repair open in the wire between the ECM/PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 21 .
  19. Turn the ignition switch OFF.
  20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  25. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 25 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 27 .
  27. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 25 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 24 . and recheck.
  28. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  29. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  30. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  31. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2005 Model); Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2005 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 73

Scheme 73: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2005 Model); Front Se
Scheme 73: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2005 Model); Front Se

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  7. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
  8. Turn the ignition switch ON (II).
  9. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 10 . NO - Go to step 19 .
  10. Turn the ignition switch OFF.
  11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
  12. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
  13. Turn the ignition switch ON (II).
  14. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 15 . NO - Repair open in the wire between the ECM/PCM (D10) and the secondary HO2S (Sensor 2), then go to step 21 .
  15. Turn the ignition switch OFF.
  16. Jump the SCS line with the HDS.
  17. Disconnect ECM/PCM connector B (24P).
  18. Check for continuity between ECM/PCM connector terminal B9 (B18)* and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the ECM/PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 21 .
  19. Turn the ignition switch OFF.
  20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  26. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drive 1 minute or more
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 26 . and recheck.
  29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  31. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drive 1 minute or more
  32. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2006 Model); Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 76

Scheme 76: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2006 Model); Front Se
Scheme 76: DTC P0138, P0158: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage (2006 Model); Front Se

Scheme 77

Scheme 77
Scheme 77

Scheme 78

Scheme 78
Scheme 78
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  7. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
  8. Turn the ignition switch ON (II).
  9. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 10 . NO - Go to step 19 .
  10. Turn the ignition switch OFF.
  11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
  12. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
  13. Turn the ignition switch ON (II).
  14. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES - Go to step 15 . NO - Repair open in the wire between the ECM/PCM (C12) and the secondary HO2S (Sensor 2), then go to step 21 .
  15. Turn the ignition switch OFF.
  16. Jump the SCS line with the HDS.
  17. Disconnect ECM/PCM connector B (24P).
  18. Check for continuity between ECM/PCM connector terminal B9 (B18)* and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the ECM/PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 21 .
  19. Turn the ignition switch OFF.
  20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  26. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drive 1 minute or more
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 . and recheck.
  29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  31. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Engine speed at 1,500-3,000 rpm Drive 1 minute or more
  32. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0138 and/or P0158* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0139, P0159: Rear Secondary HO2S (Bank 1, Sensor 2) Slow Response (2004 Model); Front Secondary HO2S (Bank 2, Sensor 2) Slow Response (2004 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  5. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 . and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Engine speed at 2,000-3,000 rpm Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0139 and/or P0159* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 14 .
  14. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 and recheck.

DTC P0139, P0159: Rear Secondary HO2S (Bank 1, Sensor 2) Slow Response (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Slow Response (2005-2006 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
  5. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) A/T in D position (M/T in 4th gear) Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0139 and/or P0159* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 14 .
  14. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 . and recheck.

DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2004-2005 Models); Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 79

Scheme 79: DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2004-2005 Model
Scheme 79: DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2004-2005 Model

Scheme 80

Scheme 80
Scheme 80

Scheme 81

Scheme 81
Scheme 81

Scheme 82

Scheme 82
Scheme 82

Scheme 83

Scheme 83
Scheme 83

Scheme 84

Scheme 84
Scheme 84

Scheme 85

Scheme 85
Scheme 85

Scheme 86

Scheme 86
Scheme 86

Scheme 87

Scheme 87
Scheme 87
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Check these fuses: No. 19 Fl ECU (ECM/PCM) (40 A) fuse in the under-hood fuse/relay box. No. 4 LAF (A/F SENSOR) (15 A) fuse in the under-dash fuse/relay box. No. 23 IGP (7.5 A) fuse in the under-dash fuse/relay box. Are any of the fuses blown? YES - Repair short in the wire between the A/F sensors, the secondary HO2S, the A/F sensor relay (LAF), and the fuses, then replace the blown fuse(s), and go to step 22 . NO - Go to step 7 .
  7. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  8. At the secondary HO2S (Sensor 2) side, measure resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-6.6 ohms at room temperature? YES - Go to step 9 . NO - Go to step 21 .
  9. Check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. Is there continuity? YES - Go to step 21 . NO - Go to step 10 .
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector E (31P).
  12. Check for continuity between ECM/PCM connector terminal E9 (E8)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E9 (E8)*) and the secondary HO2S (Sensor 2), then go to step 22 . NO - Go to step 13 .
  13. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM/PCM connector terminal E9 (E8)* and body ground. Is there continuity? YES - Go to step 15 . NO - Repair open in the wire between the ECM/PCM (E9 (E8)*) and the secondary HO2S (Sensor 2), then go to step 22 .
  15. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 4 to body ground with a jumper wire.
  16. Remove the A/F sensor relay (LAF) (A).
  17. Check for continuity between A/F sensor relay (LAF) 4P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 18 . NO - Repair open in the wire between the A/F sensor, the secondary HO2S, and the A/F sensor relay (LAF), then go to step 22 .
  18. Disconnect ECM/PCM connector A (31P).
  19. Check for continuity between ECM/PCM connector terminal A4 and A/F sensor relay (LAF) 4P connector terminal No. 4. Is there continuity? YES - Go to step 20 . NO - Repair open in the wire between the ECM/PCM (A4) and the A/F sensor relay (LAF), then go to step 22 .
  20. Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay (LAF) OK? YES - Go to step 27 . NO - Replace the A/F sensor relay (LAF), then go to step 22 .
  21. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0141 and/or P0161* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 26 .
  26. Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 24 and recheck.
  27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0141 and/or P0161* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2006 Model); Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 88

Scheme 88: DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2006 Model); Fr
Scheme 88: DTC P0141, P0161: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction (2006 Model); Fr

Scheme 89

Scheme 89
Scheme 89

Scheme 90

Scheme 90
Scheme 90

Scheme 91

Scheme 91
Scheme 91

Scheme 92

Scheme 92
Scheme 92

Scheme 93

Scheme 93
Scheme 93

Scheme 94

Scheme 94
Scheme 94

Scheme 95

Scheme 95
Scheme 95
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Check these fuses: No. 19 Fl ECU (ECM/PCM) (40 A) fuse in the under-hood fuse/relay box. No. 4 LAF (A/F SENSOR) (15 A) fuse in the under-dash fuse/relay box. No. 23 IGP (7.5 A) fuse in the under-dash fuse/relay box. Are any of the fuses blown? YES - Repair short in the wire between the A/F sensors, the secondary HO2S, the A/F sensor relay (LAF), and the fuses, then replace the blown fuse(s), and go to step 22 . NO - Go to step 7 .
  7. Disconnect the secondary HO2S (Sensor 2) 4P connector.
  8. At the secondary HO2S (Sensor 2) side, measure resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-6.6 ohms at room temperature? YES - Go to step 9 . NO - Go to step 21 .
  9. Check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. Is there continuity? YES - Go to step 21 . NO - Go to step 10 .
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector A (31P).
  12. Check for continuity between ECM/PCM connector terminal A9 (A8)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A9 (A8)*) and the secondary HO2S (Sensor 2), then go to step 22 . NO - Go to step 13 .
  13. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM/PCM connector terminal A9 (A8)* and body ground. Is there continuity? YES - Go to step 15 . NO - Repair open in the wire between the ECM/PCM (A9 (A8)*) and the secondary HO2S (Sensor 2), then go to step 22 .
  15. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 4 to body ground with a jumper wire.
  16. Remove the A/F sensor relay (LAF) (A).
  17. Check for continuity between A/F sensor relay (LAF) 4P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 18 . NO - Repair open in the wire between the A/F sensor, the secondary HO2S, and the A/F sensor relay (LAF), then go to step 22 .
  18. Disconnect ECM/PCM connector E (31P).
  19. Check for continuity between ECM/PCM connector terminal E4 and A/F sensor relay (LAF) 4P connector terminal No. 4. Is there continuity? YES - Go to step 20 . NO - Repair open in the wire between the ECM/PCM (E4) and the A/F sensor relay (LAF), then go to step 22 .
  20. Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay (LAF) OK? YES - Go to step 27 . NO - Replace the A/F sensor relay (LAF), then go to step 22 .
  21. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  22. Turn the ignition switch ON (II).
  23. Reset the ECM/PCM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0141 and/or P0161* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 26 .
  26. Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 24 . and recheck.
  27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0141 and/or P0161* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0171, P0172, P0174, P0175: Rear Bank (Bank 1) Fuel System Too Lean; Rear Bank (Bank 1) Fuel System Too Rich; Front Bank (Bank 2) Fuel System Too Lean; Front Bank (Bank 2) Fuel System Too Rich

Note. If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174, and/or P0175, troubleshoot those DTCs first, then recheck for P0171, P0172, P0174, and/or P0175. P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0133, P0153, P2195, P2197, P2237, P2238, P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2627, P2628, P2630, P2631, P2A00, P2A03: Air fuel ratio (A/F) sensor (Sensor 1) P0134, P0135, P0154, P0155: Air fuel ratio (A/F) sensor (Sensor 1) heater P0137, P0138, P0139, P0157, P0158, P0159: Secondary HO2S (Sensor 2) P0141, P0161: Secondary HO2S (Sensor 2) heater P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system P2279: Intake air leakage Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Check the valve clearances and adjust if necessary (P0172 and P0175 only). If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 2 . NO - Check these items: If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system) ), then go to step 2 . If the pressure is too low, check the fuel pump, the fuel pressure regulator and the fuel feed line, then go to step 2 .
  2. Turn the ignition switch ON (II).
  3. Reset the ECM/PCM with the HDS.
  4. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  5. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  6. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 5th gear) Drive at a steady speed between 25-55 mph (40-88 km/h) for 5 minutes, then drive at a steady speed between 15-75 mph (24-120 km/h) for 15 minutes. NOTE: DTC P0171, P0172, P0174, and/or P0175 may take up to 80 minutes of test driving to set. Using the HDS, monitor the long term fuel trim (LT FUEL TRIM). If the long term fuel trim within 0.86-1.17, there is no problem at this time.
  7. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0171, P0172, P0174, or P0175 is indicated, go to step 25 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306: Random Misfire and Any Combination of the Following; No. 1 Cylinder Misfire Detected; No. 2 Cylinder Misfire Detected; No. 3 Cylinder Misfire Detected; No. 4 Cylinder Misfire Detected; No. 5 Cylinder Misfire Detected; No. 6 Cylinder Misfire Detected

Special Tools Required

  1. Pressure gauge adapter 07NAJ-P07010A
  2. A/T low pressure gauge w/panel 07406-0070300
  3. A/T pressure hose 07406-0020201
  4. A/T pressure hose, 2,210 mm 07MAJ-PY4011A
  5. A/T pressure adapter 07MAJ-PY40120
  6. Oil pressure hose 07ZAJ-S5A0200

Note. If the misfire is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0306) will be stored. If the misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfire stops, the MIL will remain on. Troubleshoot the following DTCs first, if any of them were stored along with the random misfire DTC(s): Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor

P0171, P0172, P0174, P0175: Fuel system

P0335, P0339, P0385, P0389: Crankshaft position (CKP) sensor A/B

P0506, P0507: Idle control system

P0340, P0344: Camshaft position (CMP) sensor

P2646, P2647, P2648, P2649: VTEC system

P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system

Scheme 96

Scheme 96
Scheme 96
  1. Record all freeze data and any on-board snapshot with the HDS.
  2. Clear the DTC with the HDS.
  3. Start the engine (in Park or neutral), then let it idle without load.
  4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then recheck.
  5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9 . NO - Go to step 6 .
  6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 8 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 . and recheck.
  8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9 . NO - Intermittent failure, system is OK at this time.
  9. Turn the ignition switch OFF.
  10. Check the fuel quality. Is the quality good? YES - Go to step 11 . NO - Drain the tank, and fill it with a known-good fuel, then go to step 20 .
  11. Inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/tl/iii-2003-2006/remont/ignition-system/#ignition-system) ). If the spark plugs are fouled or worn, replace them.
  12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 14 . NO - Go to step 20 .
  14. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Go to step 15 . NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system) ) then go to step 20 . If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system) ), then go to step 20 .
  15. Turn the ignition switch OFF.
  16. Remove the rocker arm oil pressure switch (VTEC oil pressure switch) (A), and install the special tools as shown, then install the rocker arm oil pressure switch (VTEC oil pressure switch) in the pressure gauge adapter (B). NOTE: Install the switch in the reverse order of removal with a new O-ring.
  17. Reconnect rocker arm oil pressure switch (VTEC oil pressure switch) 2P connector.
  18. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
  19. Check the oil pressure at engine speed of 1,000 and 2,000 rpm. Keep the measuring time as short as possible (less than 1 minute) because the engine is running without load. Is the oil pressure below 49 kPa (0.5 kgf/cm 2 , 7 psi) ? YES - Check for air in the fuel line, then go to step 20 . NO - Inspect the VTEC system (see «VTEC ROCKER ARM TEST»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ), then go to step 20 .
  20. Turn the ignition switch ON (II).
  21. Reset the ECM/PCM with the HDS.
  22. Clear the CKP pattern with the HDS.
  23. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  24. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  25. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to troubleshooting DTC P0301, P0302, P0303, P0304, P0305, or P0306, 2004-2005 models (see «DTC P0301, P0302, P0303, P0304, P0305, P0306: NO. 1 CYLINDER MISFIRE DETECTED (2004-2005 MODELS); NO. 2 CYLINDER MISFIRE DETECTED (2004-2005 MODELS); NO. 3 CYLINDER MISFIRE DETECTED (2004-2005 MODELS); NO. 4 CYLINDER MISFIRE DETECTED (2004-2005 MODELS); NO. 5 CYLINDER MISFIRE DETECTED (2004-2005 MODELS); NO. 6 CYLINDER MISFIRE DETECTED (2004-2005 MODELS)»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-p0302-p0303-p0304-p0305) ), 2006 model (see «DTC P0301, P0302, P0303, P0304, P0305, P0306: NO. 1 CYLINDER MISFIRE DETECTED (2006 MODEL); NO. 2 CYLINDER MISFIRE DETECTED (2006 MODEL); NO. 3 CYLINDER MISFIRE DETECTED (2006 MODEL); NO. 4 CYLINDER MISFIRE DETECTED (2006 MODEL); NO. 5 CYLINDER MISFIRE DETECTED (2006 MODEL); NO. 6 CYLINDER MISFIRE DETECTED (2006 MODEL)»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-p0302-p0303-p0304-p0305) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 27 .
  27. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 . and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 . and recheck.

DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2004-2005 Models); No. 2 Cylinder Misfire Detected (2004-2005 Models); No. 3 Cylinder Misfire Detected (2004-2005 Models); No. 4 Cylinder Misfire Detected (2004-2005 Models); No. 5 Cylinder Misfire Detected (2004-2005 Models); No. 6 Cylinder Misfire Detected (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 97

Scheme 97: DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2004-2005 Models); No
Scheme 97: DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2004-2005 Models); No

Scheme 98

Scheme 98
Scheme 98

Scheme 99

Scheme 99
Scheme 99

Scheme 100

Scheme 100
Scheme 100

Scheme 101

Scheme 101
Scheme 101

Scheme 102

Scheme 102
Scheme 102

Scheme 103

Scheme 103
Scheme 103

Scheme 104

Scheme 104
Scheme 104

Scheme 105

Scheme 105
Scheme 105

Scheme 106

Scheme 106
Scheme 106

Scheme 107

Scheme 107
Scheme 107
  1. Clear the DTC with the HDS.
  2. Start the engine (in Park or neutral), then let it idle without load.
  3. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 8 . NO - If the screen indicates PASSED, go to step 4 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
  4. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 8 . NO - Go to step 5 .
  5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  6. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 8 . NO - If the screen indicates PASSED, go to step 7 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 5 . and recheck.
  7. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 8 . NO - Intermittent failure, system is OK at this time. Check the fuel and ignition system circuit connectors for loose wires or poor connections.
  8. Turn the ignition switch OFF.
  9. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  10. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  11. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 12 . NO - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Make sure the coil connections are secure.
  12. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was moved? YES - Replace the faulty ignition coil (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/ignition-system/#ignition-system) ), then go to step 54 . NO - Go to step 13 .
  13. Turn the ignition switch OFF.
  14. Exchange the spark plug from the problem cylinder with one from another cylinder.
  15. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  16. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 17 . NO - Intermittent misfire due to spark plug fouling (no misfire at this time).
  17. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was moved? YES - Replace the faulty spark plug, then go to step 54 . NO - Go to step 18 .
  18. Turn the ignition switch OFF.
  19. Exchange the injector from the problem cylinder with one from the another cylinder.
  20. Start the engine, and let it idle 2 minutes.
  21. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  22. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 23 . NO - Intermittent misfire due to bad contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
  23. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 54 . NO - Go to step 24 .
  24. Turn the ignition switch OFF.
  25. Disconnect ignition coil 3P connector from the problem cylinder.
  26. Turn the ignition switch ON (II).
  27. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 28 . NO - Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 54 .
  28. Turn the ignition switch OFF.
  29. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 30 . NO - Repair open in the wire between the ignition coil and G101, then go to step 54 .
  30. Turn the ignition switch OFF.
  31. Jump the SCS line with the HDS.
  32. Disconnect ECM/PCM connector E (31P).
  33. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 E20 YEL/GRN No. 2 P0302 E19 BLU/RED No. 3 P0303 E18 WHT/BLU No. 4 P0304 E17 BRN No. 5 P0305 E16 BLK/RED No. 6 P0306 E15 BRN/WHT Is there continuity? YES - Repair short in the wire between the ECM/PCM and the ignition coil, then go to step 54 . NO - Go to step 34 .
  34. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see «JUMPER WIRE SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). JUMPER WIRE SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 YEL/GRN No. 2 P0302 BLU/RED No. 3 P0303 WHT/BLU No. 4 P0304 BRN No. 5 P0305 BLK/RED No. 6 P0306 BRN/WHT
  35. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 E20 YEL/GRN No. 2 P0302 E19 BLU/RED No. 3 P0303 E18 WHT/BLU No. 4 P0304 E17 BRN No. 5 P0305 E16 BLK/RED No. 6 P0306 E15 BRN/WHT Is there continuity? YES - Go to step 36 . NO - Repair open in the wire between the ECM/PCM and the ignition coil, then go to step 54 .
  36. Reconnect the ignition coil 3P connector and ECM/PCM connector E (31P).
  37. Do an engine compression and a cylinder leakdown test. Did the engine pass both tests? YES - Go to step 38 . NO - Repair the engine, then go to step 54 .
  38. Do the «VTEC ROCKER ARM TEST»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) . Did the engine pass the test? YES - Go to step 39 . NO - Repair the VTEC rocker arm, then go to step 54 .
  39. Turn the ignition switch OFF.
  40. Jump the SCS line with the HDS.
  41. Disconnect ECM/PCM connector E (31P).
  42. Turn the ignition switch ON (II).
  43. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 E21 BRN No. 2 P0302 E31 RED No. 3 P0303 E30 BLU No. 4 P0304 E29 YEL No. 5 P0305 E28 BLK/RED No. 6 P0306 E27 WHT/BLU Is there battery voltage? YES - Go to step 53 . NO - Go to step 44 .
  44. Turn the ignition switch OFF.
  45. Remove the intake manifold (see «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  46. Disconnect the injector 2P connector from the problem cylinder.
  47. Turn the ignition switch ON (II).
  48. Measure voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 49 . NO - Repair open in the wire between the injector and PGM-FI main relay 1 (Fl MAIN), then go to step 54 .
  49. Turn the ignition switch OFF.
  50. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 E21 BRN No. 2 P0302 E31 RED No. 3 P0303 E30 BLU No. 4 P0304 E29 YEL No. 5 P0305 E28 BLK/RED No. 6 P0306 E27 WHT/BLU Is there continuity? YES - Repair short in the wire between the ECM/PCM and the injector, then go to step 54 . NO - Go to step 51 .
  51. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see «JUMPER WIRE SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). JUMPER WIRE SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 BRN No. 2 P0302 RED No. 3 P0303 BLU No. 4 P0304 YEL No. 5 P0305 BLK/RED No. 6 P0306 WHT/BLU
  52. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 E21 BRN No. 2 P0302 E31 RED No. 3 P0303 E30 BLU No. 4 P0304 E29 YEL No. 5 P0305 E28 BLK/RED No. 6 P0306 E27 WHT/BLU Is there continuity? YES - Go to step 53 . NO - Repair open in the wire between the ECM/PCM and the injector, then go to step 54 .
  53. Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES - Go to step 63 . NO - Replace the injector (see «INJECTOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 54 .
  54. Reconnect all connectors.
  55. Turn the ignition switch ON (II).
  56. Reset the ECM/PCM with the HDS.
  57. Clear the CKP pattern with the HDS.
  58. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  59. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  60. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  61. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0301, P0302, P0303, P0304, P0305, or P0306 (see «DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306: RANDOM MISFIRE AND ANY COMBINATION OF THE FOLLOWING; NO. 1 CYLINDER MISFIRE DETECTED; NO. 2 CYLINDER MISFIRE DETECTED; NO. 3 CYLINDER MISFIRE DETECTED; NO. 4 CYLINDER MISFIRE DETECTED; NO. 5 CYLINDER MISFIRE DETECTED; NO. 6 CYLINDER MISFIRE DETECTED»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dtc-p0300-p0301-p0302-p0303-p0304) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 62 .
  62. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 . and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 60 and recheck.
  63. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  64. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  65. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the injector, the ignition coil, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2006 Model); No. 2 Cylinder Misfire Detected (2006 Model); No. 3 Cylinder Misfire Detected (2006 Model); No. 4 Cylinder Misfire Detected (2006 Model); No. 5 Cylinder Misfire Detected (2006 Model); No. 6 Cylinder Misfire Detected (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 108

Scheme 108: DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2006 Model); No. 2 Cy
Scheme 108: DTC P0301, P0302, P0303, P0304, P0305, P0306: No. 1 Cylinder Misfire Detected (2006 Model); No. 2 Cy

Scheme 109

Scheme 109
Scheme 109

Scheme 110

Scheme 110
Scheme 110

Scheme 111

Scheme 111
Scheme 111

Scheme 112

Scheme 112
Scheme 112

Scheme 113

Scheme 113
Scheme 113

Scheme 114

Scheme 114
Scheme 114

Scheme 115

Scheme 115
Scheme 115

Scheme 116

Scheme 116
Scheme 116

Scheme 117

Scheme 117
Scheme 117

Scheme 118

Scheme 118
Scheme 118
  1. Clear the DTC with the HDS.
  2. Start the engine (in Park or neutral), then let it idle without load.
  3. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 8 . NO - If the screen indicates PASSED, go to step 4 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
  4. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 8 . NO - Go to step 5 .
  5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  6. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 8 . NO - If the screen indicates PASSED, go to step 7 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
  7. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 8 . NO - Intermittent failure, system is OK at this time. Check the fuel and ignition system circuit connectors for loose wires or poor connections.
  8. Turn the ignition switch OFF.
  9. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  10. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  11. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 12 . NO - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Make sure the coil connections are secure.
  12. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was moved? YES - Replace the faulty ignition coil (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/ignition-system/#ignition-system) ), then go to step 54 . NO - Go to step 13 .
  13. Turn the ignition switch OFF.
  14. Exchange the spark plug from the problem cylinder with one from another cylinder.
  15. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  16. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 17 . NO - Intermittent misfire due to spark plug fouling (no misfire at this time).
  17. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was moved? YES - Replace the faulty spark plug, then go to step 54 . NO - Go to step 18 .
  18. Turn the ignition switch OFF.
  19. Exchange the injector from the problem cylinder with one from the another cylinder.
  20. Start the engine, and let it idle 2 minutes.
  21. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  22. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 23 . NO - Intermittent misfire due to bad contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
  23. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 54 . NO - Go to step 24 .
  24. Turn the ignition switch OFF.
  25. Disconnect ignition coil 3P connector from the problem cylinder.
  26. Turn the ignition switch ON (II).
  27. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 28 . NO - Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 54 .
  28. Turn the ignition switch OFF.
  29. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity YES - Go to step 30 . NO - Repair open in the wire between the ignition coil and G101, then go to step 54 .
  30. Turn the ignition switch OFF.
  31. Jump the SCS line with the HDS.
  32. Disconnect ECM/PCM connector A (31P).
  33. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A20 YEL/GRN No. 2 P0302 A19 BLU/RED No. 3 P0303 A18 WHT/BLU No. 4 P0304 A17 BRN No. 5 P0305 A16 BLK/RED No. 6 P0306 A15 BRN/WHT Is there continuity? YES - Repair short in the wire between the ECM/PCM and the ignition coil, then go to step 54 . NO - Go to step 34 .
  34. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see «JUMPER WIRE SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). JUMPER WIRE SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 YEL/GRN No. 2 P0302 BLU/RED No. 3 P0303 WHT/BLU No. 4 P0304 BRN No. 5 P0305 BLK/RED No. 6 P0306 BRN/WHT
  35. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A20 YEL/GRN No. 2 P0302 A19 BLU/RED No. 3 P0303 A18 WHT/BLU No. 4 P0304 A17 BRN No. 5 P0305 A16 BLK/RED No. 6 P0306 A15 BRN/WHT Is there continuity? YES - Go to step 36 . NO - Repair open in the wire between the ECM/PCM and the ignition coil, then go to step 54 .
  36. Reconnect the ignition coil 3P connector and ECM/PCM connector A (31P).
  37. Do an engine compression and a cylinder leakdown test. Did the engine pass both tests? YES - Go to step 38 . NO - Repair the engine, then go to step 54 .
  38. Do the «VTEC ROCKER ARM TEST»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) . Did the engine pass the test? YES - Go to step 39 . NO - Repair the VTEC rocker arm, then go to step 54 .
  39. Turn the ignition switch OFF.
  40. Jump the SCS line with the HDS.
  41. Disconnect ECM/PCM connector A (31P).
  42. Turn the ignition switch ON (II).
  43. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A21 BRN No. 2 P0302 A31 RED No. 3 P0303 A30 BLU No. 4 P0304 A29 YEL No. 5 P0305 A28 BLK/RED No. 6 P0306 A27 WHT/BLU Is there battery voltage? YES - Go to step 53 . NO - Go to step 44 .
  44. Turn the ignition switch OFF.
  45. Remove the intake manifold (see «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  46. Disconnect the injector 2P connector from the problem cylinder.
  47. Turn the ignition switch ON (II).
  48. Measure voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 49 . NO - Repair open in the wire between the injector and PGM-FI main relay 1 (Fl MAIN), then go to step 54 .
  49. Turn the ignition switch OFF.
  50. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A21 BRN No. 2 P0302 A31 RED No. 3 P0303 A30 BLU No. 4 P0304 A29 YEL No. 5 P0305 A28 BLK/RED No. 6 P0306 A27 WHT/BLU Is there continuity? YES - Repair short in the wire between the ECM/PCM and the injector, then go to step 54 . NO - Go to step 51 .
  51. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see «JUMPER WIRE SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). JUMPER WIRE SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 BRN No. 2 P0302 RED No. 3 P0303 BLU No. 4 P0304 YEL No. 5 P0305 BLK/RED No. 6 P0306 WHT/BLU
  52. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see «ECM/PCM CONNECTOR TERMINAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). ECM/PCM CONNECTOR TERMINAL SPECIFICATION PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A21 BRN No. 2 P0302 A31 RED No. 3 P0303 A30 BLU No. 4 P0304 A29 YEL No. 5 P0305 A28 BLK/RED No. 6 P0306 A27 WHT/BLU Is there continuity? YES - Go to step 53 . NO - Repair open in the wire between the ECM/PCM and the injector, then go to step 54 .
  53. Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES - Go to step 63 . NO - Replace the injector (see «INJECTOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 54 .
  54. Reconnect all connectors.
  55. Turn the ignition switch ON (II).
  56. Reset the ECM/PCM with the HDS.
  57. Clear the CKP pattern with the HDS.
  58. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  59. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  60. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  61. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0301, P0302, P0303, P0304, P0305, or P0306 (see «DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306: RANDOM MISFIRE AND ANY COMBINATION OF THE FOLLOWING; NO. 1 CYLINDER MISFIRE DETECTED; NO. 2 CYLINDER MISFIRE DETECTED; NO. 3 CYLINDER MISFIRE DETECTED; NO. 4 CYLINDER MISFIRE DETECTED; NO. 5 CYLINDER MISFIRE DETECTED; NO. 6 CYLINDER MISFIRE DETECTED»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dtc-p0300-p0301-p0302-p0303-p0304) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 62 .
  62. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 . and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 60 . and recheck.
  63. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  64. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Engine coolant temperature Vehicle speed Throttle position CLV (calculated load value)
  65. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the injector, the ignition coil, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0325: Knock Sensor Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 119

Scheme 119: DTC P0325: Knock Sensor Circuit Malfunction
Scheme 119: DTC P0325: Knock Sensor Circuit Malfunction

Scheme 120

Scheme 120
Scheme 120

Scheme 121

Scheme 121
Scheme 121

Scheme 122

Scheme 122
Scheme 122
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
  5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES - Go to step 6 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the ECM/PCM.
  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
  8. Disconnect the knock sensor subharness 1P connector.
  9. Disconnect ECM/PCM connector B (24P).
  10. Check for continuity between ECM/PCM connector terminal B6 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B6) and the knock sensor subharness, then go to step 19 . NO - Go to step 11 .
  11. Connect the knock sensor subharness 1P connector terminal to body ground with a jumper wire.
  12. Check for continuity between ECM/PCM connector terminal B6 and body ground. Is there continuity? YES - Go to step 13 . NO - Repair open in the wire between the ECM/PCM (B6) and the knock sensor subharness, then go to step 19 .
  13. Remove the intake manifold (see «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  14. Disconnect the knock sensor 1P connector.
  15. Check for continuity between the knock sensor subharness 1P connector terminal and body ground. Is there continuity? YES - Repair short in the knock sensor subharness, then go to step 18 . NO - Go to step 16 .
  16. Check the knock sensor subharness for an open. Is the subharness OK? YES - Go to step 17 . NO - Repair open in the knock sensor subharness, then go to step 18 .
  17. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  18. Install the intake manifold (see «INSTALLATION»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  19. Reconnect all connectors.
  20. Turn the ignition switch ON (II).
  21. Reset the ECM/PCM with the HDS.
  22. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  23. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0325 is indicated, go to step 26 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 25 .
  25. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 . If the screen indicates NOT COMPLETED, go to step 22 . and recheck.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0325 is indicated, check for poor connections or loose terminals at the knock sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0335, P0385: CKP Sensor A No Signal (2004-2005 Models); CKP Sensor B No Signal (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to CKP sensor B. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 123

Scheme 123: DTC P0335, P0385: CKP Sensor A No Signal (2004-2005 Models); CKP Sensor B No Signal (2004-2005 Model
Scheme 123: DTC P0335, P0385: CKP Sensor A No Signal (2004-2005 Models); CKP Sensor B No Signal (2004-2005 Model

Scheme 124

Scheme 124
Scheme 124

Scheme 125

Scheme 125
Scheme 125

Scheme 126

Scheme 126
Scheme 126

Scheme 127

Scheme 127
Scheme 127
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect CKP sensor A/B 6P connector.
  7. Turn the ignition switch ON (II).
  8. Measure voltage between CKP sensor A/B 6P connector terminal No. 6 (No. 3)* and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the wire between CKP sensor A/B and PGM-FI main relay 1 (Fl MAIN), then go to step 18 .
  9. Measure voltage between CKP sensor A/B 6P connector terminal No. 5 (No. 2)* and body ground. Is there about 5 V? YES - Go to step 10 . NO - Go to step 11 .
  10. Measure voltage between CKP sensor A/B 6P connector terminals No. 4 (No. 1)* and No. 6 (No. 3)*. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between CKP sensor A/Band G101, then go to step 18 .
  11. Measure voltage between ECM/PCM connector terminal D13 (D1)* and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D13(D1)*) and CKP sensor A/B, then go to step 18 . NO - Go to step 12 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector D (17P).
  15. Check for continuity between ECM/PCM connector terminal D13 (D1)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D13 (D1)*) and CKP sensor A/B, then go to step 18 . NO - Go to step 25 .
  16. Turn the ignition switch OFF.
  17. Replace the CKP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Clear the CKP pattern with the HDS.
  22. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0335 and/or P0385* is indicated, check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0335 and/or P0385* is indicated, check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0335, P0385: CKP Sensor A No Signal (2006 Model); CKP Sensor B No Signal (2006 Model)

Note. Information marked with an asterisk (*) applies to CKP sensor B. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 128

Scheme 128: DTC P0335, P0385: CKP Sensor A No Signal (2006 Model); CKP Sensor B No Signal (2006 Model)
Scheme 128: DTC P0335, P0385: CKP Sensor A No Signal (2006 Model); CKP Sensor B No Signal (2006 Model)

Scheme 129

Scheme 129
Scheme 129

Scheme 130

Scheme 130
Scheme 130

Scheme 131

Scheme 131
Scheme 131

Scheme 132

Scheme 132
Scheme 132
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect CKP sensor A/B 6P connector.
  7. Turn the ignition switch ON (II).
  8. Measure voltage between CKP sensor A/B 6P connector terminal No. 6 (No. 3)* and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the wire between CKP sensor A/B and PGM-FI main relay 1 (Fl MAIN), then go to step 18 .
  9. Measure voltage between CKP sensor A/B 6P connector terminal No. 5 (No. 2)* and body ground. Is there about 5 V? YES - Go to step 10 . NO - Go to step 11 .
  10. Measure voltage between CKP sensor A/B 6P connector terminals No. 4 (No. 1)* and No. 6 (No. 3)*. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between CKP sensor A/B and G101, then go to step 18 .
  11. Measure voltage between ECM/PCM connector terminal B17 (B1)* and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (B17(B1)*) and CKP sensor A/B, then go to step 18 . NO - Go to step 12 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector B (24P).
  15. Check for continuity between ECM/PCM connector terminal B17 (B1)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B17 (B1)*) and CKP sensor A/B, then go to step 18 . NO - Go to step 25 .
  16. Turn the ignition switch OFF.
  17. Replace the CKP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Clear the CKP pattern with the HDS.
  22. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  24. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0335 and/or P0385* is indicated, check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0335 and/or P0385* is indicated, check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0339, P0389: CKP Sensor A Circuit Intermittent Interruption; CKP Sensor B Circuit Intermittent Interruption

Note. Information marked with an asterisk (*) applies to CKP sensor B. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Clear the DTC with the HDS.
  2. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0339 and/or P0389* indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM.
  4. Check for poor or loose connections at these connectors and terminals: CKP sensor A/B ECM/PCM Engine ground Body ground Are the connections OK? YES - Go to step 5 . NO - Reconnect or repair the connectors or terminals, then go to step 8 .
  5. Check for damage to the CKP sensor A/B pulse plate on the timing belt drive pulley (see «TIMING BELT ADJUSTER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ). Is there damage? YES - Replace CKP sensor A/B pulse plate/timing belt drive pulley (see «TIMING BELT ADJUSTER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ), then go to step 8 . NO - Go to step 6 .
  6. Turn the ignition switch OFF.
  7. Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Clear the CKP pattern with the HDS.
  11. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  12. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  13. Start the engine, and let it idle 10 seconds.
  14. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0339 and/or P0389* is indicated, check for poor connections or loose terminals at CKP sensor A/B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC P0340: CMP Sensor No Signal (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 133

Scheme 133: DTC P0340: CMP Sensor No Signal (2004-2005 Models)
Scheme 133: DTC P0340: CMP Sensor No Signal (2004-2005 Models)

Scheme 134

Scheme 134
Scheme 134

Scheme 135

Scheme 135
Scheme 135

Scheme 136

Scheme 136
Scheme 136

Scheme 137

Scheme 137
Scheme 137
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect the CMP sensor 3P connector.
  7. Turn the ignition switch ON (II).
  8. Measure voltage between CMP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the wire between the CMP sensor and PGM-FI main relay 1 (FI MAIN), then go to step 18 .
  9. Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 10 . NO - Go to step 11 .
  10. Measure voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between the CMP sensor and G101, then go to step 18 .
  11. Measure voltage between ECM/PCM connector terminal D7 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D7) and the CMP sensor, then go to step 18 . NO - Go to step 12 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector D (17P).
  15. Check for continuity between ECM/PCM connector terminal D7 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D7) and the CMP sensor, then go to step 18 . NO - Go to step 26 .
  16. Turn the ignition switch OFF.
  17. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Clear the CKP pattern with the HDS.
  22. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  24. Start the engine.
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0340: CMP Sensor No Signal (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 138

Scheme 138: DTC P0340: CMP Sensor No Signal (2006 Model)
Scheme 138: DTC P0340: CMP Sensor No Signal (2006 Model)

Scheme 139

Scheme 139
Scheme 139

Scheme 140

Scheme 140
Scheme 140

Scheme 141

Scheme 141
Scheme 141

Scheme 142

Scheme 142
Scheme 142
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Disconnect the CMP sensor 3P connector.
  7. Turn the ignition switch ON (II).
  8. Measure voltage between CMP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the wire between the CMP sensor and PGM-FI main relay 1 (FI MAIN), then go to step 18 .
  9. Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 10 . NO - Go to step 11 .
  10. Measure voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between the CMP sensor and G101, then go to step 18 .
  11. Measure voltage between ECM/PCM connector terminal B8 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (B8) and the CMP sensor, then go to step 18 . NO - Go to step 12 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector B (24P).
  15. Check for continuity between ECM/PCM connector terminal B8 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B8) and the CMP sensor, then go to step 18 . NO - Go to step 26 .
  16. Turn the ignition switch OFF.
  17. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Clear the CKP pattern with the HDS.
  22. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  24. Start the engine.
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0344: CMP Sensor Circuit Intermittent Interruption

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Clear the DTC with the HDS.
  2. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0344 indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the ECM/PCM.
  4. Check for poor or loose connections at these connectors and terminals: CMP sensor ECM/PCM Engine ground Body ground Are the connections OK? YES - Go to step 5 . NO - Reconnect or repair the connectors or terminals, then go to step 8 .
  5. Check for damage to the CMP sensor pulse projection on the front camshaft pulley (see «CMP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). Is there damage? YES - Replace the front camshaft pulley (see «CMP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 8 . NO - Go to step 6 .
  6. Turn the ignition switch OFF.
  7. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Clear the CKP pattern with the HDS.
  11. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  12. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  13. Start the engine, and let it idle 10 seconds.
  14. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0344 is indicated, check for poor connections or loose terminals at the CKP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC P0562: Charging System Low Voltage (2006 Model)

Note. If any high current load accessories are installed, this DTC can be set. If DTC P16BB and/or P16BC is stored at the same time as DTC P0562, troubleshoot DTC P16BB and/or P16BC first, then recheck for DTC P0562. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0562 indicated? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ), then go to step 7 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, and check the battery performance (see «BATTERY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#battery) ).
  7. Turn the ignition switch ON (II).
  8. Reset the PCM with the HDS.
  9. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  10. Start the engine.
  11. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  12. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0562 is indicated, check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage

(2004-2005 models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 143

Scheme 143: DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage
Scheme 143: DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage

Scheme 144

Scheme 144
Scheme 144

Scheme 145

Scheme 145
Scheme 145

Scheme 146

Scheme 146
Scheme 146

Scheme 147

Scheme 147
Scheme 147

Scheme 148

Scheme 148
Scheme 148

Scheme 149

Scheme 149
Scheme 149

Scheme 150

Scheme 150
Scheme 150
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch OFF.
  4. Wait 10 seconds.
  5. Turn the ignition switch ON (II).
  6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES - Go to step 7 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the No. 8 FI-ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box and the ECM/PCM.
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector A (31P).
  10. Measure voltage between ECM/PCM connector terminal A5 and body ground. Is there battery voltage? YES - Go to step 13 . NO - Go to step 11 .
  11. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-dash fuse/relay box.
  12. Check for continuity between ECM/PCM connector terminal A5 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A5) and PGM-FI main relay 1 (FI MAIN), then go to step 20 . NO - Go to step 19 .
  13. Reconnect ECM/PCM connector A (31P).
  14. Measure voltage between ECM/PCM connector terminal A5 and body ground. Is there battery voltage? YES - Go to step 15 . NO - Go to step 27 .
  15. Disconnect ECM/PCM connector E (31P).
  16. Measure voltage between ECM/PCM connector terminal E4 and body ground. Is there battery voltage? YES - Go to step 17 . NO - Go to step 27 .
  17. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-dash fuse/relay box.
  18. Measure voltage between ECM/PCM connector terminal E4 and body ground. Is there battery voltage? YES - Repair short to power in the wire between the ECM/PCM (E4) and PGM-FI main relay 1 (FI MAIN), then go to step 20 . NO - Go to step 19 .
  19. Replace PGM-FI main relay 1 (FI MAIN) (A).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Turn the ignition switch OFF.
  24. Wait 10 seconds.
  25. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0563 is indicated, check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0563 is indicated, check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 151

Scheme 151: DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage (2006 Model)
Scheme 151: DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage (2006 Model)

Scheme 152

Scheme 152
Scheme 152

Scheme 153

Scheme 153
Scheme 153

Scheme 154

Scheme 154
Scheme 154

Scheme 155

Scheme 155
Scheme 155

Scheme 156

Scheme 156
Scheme 156

Scheme 157

Scheme 157
Scheme 157

Scheme 158

Scheme 158
Scheme 158
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch OFF.
  4. Wait 10 seconds.
  5. Turn the ignition switch ON (II).
  6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES - Go to step 7 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the No. 8 FI-ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box and the ECM/PCM.
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector E (31P).
  10. Measure voltage between ECM/PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 13 . NO - Go to step 11 .
  11. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-dash fuse/relay box.
  12. Check for continuity between ECM/PCM connector terminal E5 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E5) and PGM-FI main relay 1 (FI MAIN), then go to step 20 . NO - Go to step 19 .
  13. Reconnect ECM/PCM connector E (31P).
  14. Measure voltage between ECM/PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 15 . NO - Go to step 27 .
  15. Disconnect ECM/PCM connector A (31P).
  16. Measure voltage between ECM/PCM connector terminal A4 and body ground. Is there battery voltage? YES - Go to step 17 . NO - Go to step 27 .
  17. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-dash fuse/relay box.
  18. Measure voltage between ECM/PCM connector terminal A4 and body ground. Is there battery voltage? YES - Repair short to power in the wire between the ECM/PCM (A4) and PGM-FI main relay 1 (FI MAIN), then go to step 20 . NO - Go to step 19 .
  19. Replace PGM-FI main relay 1 (FI MAIN) (A).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Turn the ignition switch OFF.
  24. Wait 10 seconds.
  25. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0563 is indicated, check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0563 is indicated, check for poor connections or loose terminals at PGM-FI main relay 1 (FI MAIN) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0603: ECM/PCM Internal Circuit Malfunction (Keep Alive Memory (KAM) Error)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Intermittent failure, system is OK at this time.

DTC P0630: VIN Not Programmed or Mismatch (2005-2006 Models)

Note. This DTC is stored only when the ECM/PCM does not have the VIN information of the vehicle. Use the HDS to input the missing VIN information. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES - Go to step 5 . NO - Go to step 3 .
  3. Input the VIN to the ECM/PCM with the HDS. Does the screen show COMPLETE? YES - Go to step 5 . NO - Go to step 4 .
  4. Check for DTCs with the HDS. Is DTC P0603 indicated? YES - Go to the «DTC P0603: ECM/PCM INTERNAL CIRCUIT MALFUNCTION (KEEP ALIVE MEMORY (KAM) ERROR)»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dtc-p0603-ecmpcm-internal-circuit-malfunction) troubleshooting. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  5. Clear the DTC with the HDS.
  6. Turn the ignition switch OFF.
  7. Turn the ignition switch ON (II), and wait 5 seconds.
  8. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0630 is indicated, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Intermittent failure, system is OK at this time.

DTC P0685: ECM/PCM Internal Circuit Malfunction (Power Control Circuit)

Note. If the problem does not return after you clear the DTCs or if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the ECM/PCM. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO -Intermittent failure, system is OK at this time.

DTC P0700: A/T Control System Malfunction

Note. This DTC is stored when there is a problem in the A/T control system. Check for A/T DTCs with the HDS, and go to the indicated DTC's troubleshooting. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 159

Scheme 159: DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)
Scheme 159: DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)

Scheme 160

Scheme 160
Scheme 160

Scheme 161

Scheme 161
Scheme 161

Scheme 162

Scheme 162
Scheme 162

Scheme 163

Scheme 163
Scheme 163

Scheme 164

Scheme 164
Scheme 164

Scheme 165

Scheme 165
Scheme 165
  1. Start the engine, and let it idle.
  2. Check the M SHAFT SPD in the DATA LIST with the HDS. Is any input shaft (mainshaft) speed indicated? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. NO - Go to step 3 .
  3. Turn the ignition switch OFF.
  4. Disconnect the input shaft (mainshaft) speed sensor 3P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 7 . NO - Repair open in the wire between the ECM (D12) and the input shaft (mainshaft) speed sensor, then go to step 21 .
  7. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 8 . NO - Go to step 14 .
  8. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 19 . NO - Go to step 9 .
  9. Turn the ignition switch OFF.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM connector D (17P).
  12. Connect input shaft (mainshaft) speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  13. Check for continuity between ECM connector terminal D10 and body ground. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the ECM (D10) and the input shaft (mainshaft) speed sensor, then go to step 21 .
  14. Measure voltage between ECM connector terminal D8 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 21 . NO - Go to step 15 .
  15. Turn the ignition switch OFF.
  16. Jump the SCS line with the HDS.
  17. Disconnect ECM connector D (17P).
  18. Check for continuity between ECM connector terminal D8 and body ground. Is there continuity? YES - Repair short in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 21 . NO - Go to step 27 .
  19. Turn the ignition switch OFF.
  20. Replace the input shaft (mainshaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 3rd gear Engine speed at 2,000-3,000 rpm Drive for several minutes
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0715 is indicated, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  27. Update the ECM if it does not have the latest software, or substitute a known-good ECM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 3rd gear Engine speed at 2,000-3,000 rpm Drive for several minutes
  29. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0715 is indicated, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 166

Scheme 166: DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)
Scheme 166: DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)

Scheme 167

Scheme 167
Scheme 167

Scheme 168

Scheme 168
Scheme 168

Scheme 169

Scheme 169
Scheme 169

Scheme 170

Scheme 170
Scheme 170

Scheme 171

Scheme 171
Scheme 171

Scheme 172

Scheme 172
Scheme 172
  1. Start the engine, and let it idle.
  2. Check the M SHAFT SPD in the DATA LIST with the HDS. Is any input shaft (mainshaft) speed indicated? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. NO - Go to step 3 .
  3. Turn the ignition switch OFF.
  4. Disconnect the input shaft (mainshaft) speed sensor 3P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 7 . NO - Repair open in the wire between the ECM (D12) and the input shaft (mainshaft) speed sensor, then go to step 21 .
  7. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 8 . NO - Go to step 14 .
  8. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 19 . NO - Go to step 9 .
  9. Turn the ignition switch OFF.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM connector C (22P).
  12. Connect input shaft (mainshaft) speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  13. Check for continuity between ECM connector terminal C12 and body ground. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the ECM (C12) and the input shaft (mainshaft) speed sensor, then go to step 21 .
  14. Measure voltage between ECM connector terminal D8 and body ground. Is there about 5 V? YES -Repair open in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 21 . NO - Go to step 15 .
  15. Turn the ignition switch OFF.
  16. Jump the SCS line with the HDS.
  17. Disconnect ECM connector D (17P).
  18. Check for continuity between ECM connector terminal D8 and body ground. Is there continuity? YES - Repair short in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 21 . NO - Go to step 27 .
  19. Turn the ignition switch OFF.
  20. Replace the input shaft (mainshaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  21. Reconnect all connectors.
  22. Turn the ignition switch ON (II).
  23. Reset the ECM with the HDS.
  24. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  25. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 3rd gear Engine speed at 2,000-3,000 rpm Drive for several minutes
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0715 is indicated, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  27. Update the ECM if it does not have the latest software, or substitute a known-good ECM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  28. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 3rd gear Engine speed at 2,000-3,000 rpm Drive for several minutes
  29. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0715 is indicated, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 173

Scheme 173: DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)
Scheme 173: DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2004-2005 Models)

Scheme 174

Scheme 174
Scheme 174

Scheme 175

Scheme 175
Scheme 175

Scheme 176

Scheme 176
Scheme 176

Scheme 177

Scheme 177
Scheme 177

Scheme 178

Scheme 178
Scheme 178

Scheme 179

Scheme 179
Scheme 179
  1. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
  2. Test-drive the vehicle several miles.
  3. Check the C SHAFT SPD in the DATA LIST with the HDS. Is any vehicle speed indicated? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM. NO - Go to step 4 .
  4. Turn the ignition switch OFF.
  5. Disconnect the output shaft (countershaft) speed sensor 3P connector.
  6. Turn the ignition switch ON (II).
  7. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 8 . NO - Repair open in the wire between the ECM (D6) and the output shaft (countershaft) speed sensor, then go to step 22 .
  8. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 9 . NO - Go to step 15 .
  9. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 20 . NO - Go to step 10 .
  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM connector D (17P).
  13. Connect output shaft (countershaft) speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM connector terminal D4 and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the ECM (D4) and the output shaft (countershaft) speed sensor, then go to step 22 .
  15. Measure voltage between ECM connector terminal D14 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM (D14) and the output shaft (countershaft) speed sensor, then go to step 22 . NO - Go to step 16 .
  16. Turn the ignition switch OFF.
  17. Jump the SCS line with the HDS.
  18. Disconnect ECM connector D (17P).
  19. Check for continuity between ECM connector terminal D14 and body ground. Is there continuity? YES - Repair short in the wire between the ECM (D14) and the output shaft (countershaft) speed sensor, then go to step 22 . NO - Go to step 29 .
  20. Turn the ignition switch OFF.
  21. Replace the output shaft (countershaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  22. Reconnect all connectors.
  23. Turn the ignition switch ON (II).
  24. Reset the ECM with the HDS.
  25. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  26. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 5th gear Engine speed at 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0720 is indicated, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT COMPLETED, go to step 26 and recheck.
  29. Update the ECM if it does not have the latest software, or substitute a known-good ECM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 5th gear Engine speed at 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
  31. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0720 is indicated, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) )

DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 180

Scheme 180: DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)
Scheme 180: DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (M/T) (2006 Model)

Scheme 181

Scheme 181
Scheme 181

Scheme 182

Scheme 182
Scheme 182

Scheme 183

Scheme 183
Scheme 183

Scheme 184

Scheme 184
Scheme 184

Scheme 185

Scheme 185
Scheme 185

Scheme 186

Scheme 186
Scheme 186
  1. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
  2. Test-drive the vehicle several miles.
  3. Check the C SHAFT SPD in the DATA LIST with the HDS. Is any vehicle speed indicated? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM. NO - Go to step 4 .
  4. Turn the ignition switch OFF.
  5. Disconnect the output shaft (countershaft) speed sensor 3P connector.
  6. Turn the ignition switch ON (II).
  7. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 8 . NO - Repair open in the wire between the ECM (C6) and the output shaft (countershaft) speed sensor, then go to step 22 .
  8. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 9 . NO - Go to step 15 .
  9. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 20 . NO - Go to step 10 .
  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM connector D (17P).
  13. Connect output shaft (countershaft) speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
  14. Check for continuity between ECM connector terminal C4 and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the ECM (C4) and the output shaft (countershaft) speed sensor, then go to step 22 .
  15. Measure voltage between ECM connector terminal B19 and body ground. Is there about 5 V? YES -Repair open in the wire between the ECM (B19) and the output shaft (countershaft) speed sensor, then go to step 22 . NO - Go to step 16 .
  16. Turn the ignition switch OFF.
  17. Jump the SCS line with the HDS.
  18. Disconnect ECM connector D (17P).
  19. Check for continuity between ECM connector terminal B19 and body ground. Is there continuity? YES - Repair short in the wire between the ECM (B19) and the output shaft (countershaft) speed sensor, then go to step 22 . NO - Go to step 29 .
  20. Turn the ignition switch OFF.
  21. Replace the output shaft (countershaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  22. Reconnect all connectors.
  23. Turn the ignition switch ON (II).
  24. Reset the ECM with the HDS.
  25. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  26. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 5th gear Engine speed at 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
  27. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0720 is indicated, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 28 .
  28. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 . and recheck. If the screen indicates NOT COMPLETED, go to step 26 . and recheck.
  29. Update the ECM if it does not have the latest software, or substitute a known-good ECM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  30. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Transmission in 5th gear Engine speed at 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
  31. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0720 is indicated, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P1109: BARO Sensor Circuit Out of Range High (2005-2006 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  1. Reset the ECM/PCM with the HDS.
  2. Start the engine.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1109 indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Intermittent failure, system is OK at this time.

DTC P1128: MAP Sensor Circuit Lower Than Expected

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Check the MAP SENSOR in the DATA LIST with the HDS. Is there less than 54.1 kPa (16.0 in.Hg, 406 mmHg) or 1.61 V held for more than 5 seconds? YES - Go to step 7 . NO - Go to step 3 .
  3. Clear the DTC with the HDS.
  4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  5. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm A/T in D position (M/T in 3rd gear) Vehicle speed accelerated from 16 mph (25 km/h) to 31 mph (50 km/h) under half throttle
  6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 7 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 . and recheck.
  7. Turn the ignition switch OFF.
  8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  9. Turn the ignition switch ON (II).
  10. Reset the ECM/PCM with the HDS.
  11. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  13. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm A/T in D position (M/T in 3rd gear) Vehicle speed accelerated from 16 mph (25 km/h) to 31 mph (50 km/h) under half throttle
  14. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1128 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 15 .
  15. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 13 . and recheck.

DTC P1129: MAP Sensor Circuit Higher Than Expected

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Check for vacuum leaks in these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster hose Are there any vacuum leaks? YES - Repair or replace part(s) with vacuum leaks, then go to step 9 . NO - Go to step 2 .
  2. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  3. Check the MAP SENSOR in the DATA LIST with the HDS. Is there more than 36.9 kPa (11.0 in.Hg, 277 mmHg) or 1.14 V held for more than 5 seconds? YES -Go to step 7 . NO - Go to step 4 .
  4. Clear the DTC with the HDS.
  5. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm A/T in D position (M/T in 5th gear) Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at least 5 seconds
  6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 7 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM. If the screen indicates NOT COMPLETED, go to step 5 . and recheck.
  7. Turn the ignition switch OFF.
  8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  9. Turn the ignition switch ON (II).
  10. Reset the ECM/PCM with the HDS.
  11. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  13. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm A/T in D position (M/T in 5th gear) Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at least 5 seconds
  14. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1129 is indicated, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 15 .
  15. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 12 . and recheck.

DTC P1172, P1174: Rear A/F Sensor (Bank 1, Sensor 1) Circuit Out of Range High (2005-2006 Models); Front A/F Sensor (Bank 2, Sensor 1) Circuit Out of Range High (2005-2006 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Monitor the OBD STAUS for P1172 and/or P1174 * in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 5 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 . and recheck.
  5. Turn the ignition switch OFF.
  6. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .)
  7. Turn the ignition switch ON (II).
  8. Reset the ECM/PCM with the HDS.
  9. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  10. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  11. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1172 and/or P1174* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 12 .
  12. Monitor the OBD STATUS for DTC P1172 and/or P1174* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 10 . and recheck.

DTC P1297: ELD Circuit Low Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 187

Scheme 187: DTC P1297: ELD Circuit Low Voltage (2004-2005 Models)
Scheme 187: DTC P1297: ELD Circuit Low Voltage (2004-2005 Models)
  1. Turn the ignition switch ON (II).
  2. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ELD and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ELD 3P connector.
  5. Turn the ignition switch ON (II).
  6. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES - Go to step 7 . NO - Go to step 11 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector A (31P).
  10. Check for continuity between ECM/PCM connector terminal A18 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A18) and the ELD, then go to step 13 . NO - Go to step 19 .
  11. Turn the ignition switch OFF.
  12. Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/body-electrical/#under-hood-fuserelay-box) ).
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  16. Start the engine.
  17. Turn on the headlights.
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1297 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  19. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  20. Start the engine.
  21. Turn on the headlights.
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC PI 297 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P1297: ELD Circuit Low Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 188

Scheme 188: DTC P1297: ELD Circuit Low Voltage (2006 Model)
Scheme 188: DTC P1297: ELD Circuit Low Voltage (2006 Model)
  1. Turn the ignition switch ON (II).
  2. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ELD and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ELD 3P connector.
  5. Turn the ignition switch ON (II).
  6. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES - Go to step 7 . NO - Go to step 11 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector E (31P).
  10. Check for continuity between ECM/PCM connector terminal E18 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E18) and the ELD, then go to step 13 . NO - Go to step 19 .
  11. Turn the ignition switch OFF.
  12. Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/body-electrical/#under-hood-fuserelay-box) ).
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  16. Start the engine.
  17. Turn on the headlights.
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1297 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  19. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  20. Start the engine.
  21. Turn on the headlights.
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES -If DTC P1297 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P1298: ELD Circuit High Voltage (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 189

Scheme 189: DTC P1298: ELD Circuit High Voltage (2004-2005 Models)
Scheme 189: DTC P1298: ELD Circuit High Voltage (2004-2005 Models)

Scheme 190

Scheme 190
Scheme 190

Scheme 191

Scheme 191
Scheme 191

Scheme 192

Scheme 192
Scheme 192
  1. Start the engine, and let it idle.
  2. Check the ELD in the DATA LIST with the HDS. Is 0.2 A or less Indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ELD and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ELD 3P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 7 . NO - Repair open in the wire between the No. 18 ACG (15 A) fuse and the ELD, then go to step 14 .
  7. Turn the ignition switch OFF.
  8. Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.
  9. Jump the SCS line with the HDS.
  10. Disconnect ECM/PCM connector A (31P).
  11. Check for continuity between ECM/PCM connector terminal A18 and body ground. Is there continuity? YES - Go to step 12 . NO - Repair open in the wire between the ECM/PCM (A18) and the ELD, then go to step 14 .
  12. Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 13 . NO - Repair open in the wire between the ELD and G302, then go to step 14 .
  13. Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/body-electrical/#under-hood-fuserelay-box) ).
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to step 19 . NO - Troubleshooting is complete.
  19. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  20. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1298 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P1298: ELD Circuit High Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 193

Scheme 193: DTC P1298: ELD Circuit High Voltage (2006 Model)
Scheme 193: DTC P1298: ELD Circuit High Voltage (2006 Model)

Scheme 194

Scheme 194
Scheme 194

Scheme 195

Scheme 195
Scheme 195

Scheme 196

Scheme 196
Scheme 196
  1. Start the engine, and let it idle.
  2. Check the ELD in the DATA LIST with the HDS. Is 0.2 A or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ELD and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ELD 3P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 7 . NO - Repair open in the wire between the No. 18 ACG (15 A) fuse and the ELD, then go to step 14 .
  7. Turn the ignition switch OFF.
  8. Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.
  9. Jump the SCS line with the HDS.
  10. Disconnect ECM/PCM connector E (31P).
  11. Check for continuity between ECM/PCM connector terminal E18 and body ground. Is there continuity? YES - Go to step 12 . NO - Repair open in the wire between the ECM/PCM (E18) and the ELD, then go to step 14 .
  12. Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 13 . NO - Repair open in the wire between the ELD and G302, then go to step 14 .
  13. Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/body-electrical/#under-hood-fuserelay-box) ).
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to step 19 . NO - Troubleshooting is complete.
  19. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  20. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1298 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P1549: Charging System High Voltage (2006 Model)

Note. If a high voltage battery (24 V, etc.) is connected to the vehicle, this DTC can be stored. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check under these conditions: A/C off Headlights off Rear window defogger off
  5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1549 indicated? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ), then go to step 7 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.
  7. Turn the ignition switch ON (II).
  8. Reset the PCM with the HDS.
  9. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  10. Start the engine.
  11. Check under these conditions: A/C off Headlights off Rear window defogger off
  12. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1549 is indicated, check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P16BB: Alternator B Terminal Circuit Low Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check under these conditions: A/C on Temperature control on maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BB indicated? YES - Go to step 7 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, and check the battery performance (see «BATTERY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#battery) ).
  7. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+B line). Are the connections and terminals OK ? YES - Go to step 8 . NO - Reconnect or repair the connectors or terminals, then go to step 9 .
  8. Check for an open in the wire between the alternator and under-hood fuse/relay box at the starter subharness. Is the harness OK? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ), then go to step 9 . NO - Repair open in the wire between the alternator and the under-hood fuse/relay box, then go to step 9.
  9. Turn the ignition switch ON (II).
  10. Reset the ECM/PCM with the HDS.
  11. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  12. Start the engine.
  13. Check under these conditions: A/C on Temperature control on maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  14. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  15. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P16BB is indicated, check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 197

Scheme 197: DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage (2006 Model)
Scheme 197: DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage (2006 Model)

Scheme 198

Scheme 198
Scheme 198

Scheme 199

Scheme 199
Scheme 199

Scheme 200

Scheme 200
Scheme 200
  1. Check for poor connections at the alternator 4P connector. Are the connections OK? YES - Go to step 2 . NO - Reconnect or repair the connector, then go to step 19 .
  2. Turn the ignition switch ON (II).
  3. Clear the DTC with the HDS.
  4. Start the engine.
  5. Check under these conditions: A/C on Temperature control on maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  6. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  7. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES - Go to step 8 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator.
  8. Turn the ignition switch OFF.
  9. Disconnect the alternator 4P connector.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between alternator 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 12 . NO - Repair open in the wire between the alternator (IG1 line) and the No. 18 ACG (15 A) fuse in under-dash fuse/relay box, then go to step 18 .
  12. Measure voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ), then go to step 18 . NO - Go to step 13 .
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HDS.
  15. Disconnect ECM/PCM connector A (31P).
  16. Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire.
  17. Check for continuity between ECM/PCM connector terminal A12 and body ground. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the ECM/PCM (A12) and the alternator, then go to step 18 .
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  22. Start the engine.
  23. Check under these conditions: A/C on Temperature control on maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  24. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  25. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P16BC is indicated, check for poor connections or loose terminals at the alternator and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  27. Start the engine.
  28. Check under these conditions: A/C on Temperature control on maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
  29. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
  30. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P16BC is indicated, check for poor connections or loose terminals at the alternator and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2195, P2197: Rear A/F Sensor (Bank 1, Sensor 1) Signal Stuck Lean; Front A/F Sensor (Bank 2, Sensor 1) Signal Stuck Lean

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). If the vehicle was out of fuel and the engine stalled before this DTC was stored, refuel and clear the DTC with the HDS. If DTC P2101, P2108, P2118, P2135, P2176, U0107 or a combination of P2122 and P2127, P2122 and P2138 or P2127 and P2138 is stored at the same time as DTC P2195 (P2197)*, troubleshoot those DTCs first, then recheck for DTC P2195 (P2197)*. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Inspect the condition of the A/F sensor (Sensor 1). Is it loose in the exhaust pipe? YES - Go to step 2 . NO - Go to step 4 .
  2. Turn the ignition switch OFF.
  3. Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) . )
  4. Turn the ignition switch ON (II).
  5. Reset the ECM/PCM with the HDS.
  6. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  7. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2195 and/or P2197* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 8 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  8. Monitor the OBD STATUS for DTC P2195 and/or P2197* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 2 . If the screen indicates NOT COMPLETED, go to step 5 . and recheck.

DTC P2227: BARO Sensor Circuit Range/Performance Problem

Note. If DTC P0107, P0108, P1128, and/or P1129 are stored at the same time as DTC P2227, troubleshoot those DTCs first, then recheck for DTC P2227. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II), and wait 2 seconds.
  2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 101 kPa (29.9 in.Hg, 760 mmHg), or about 2.9 V at sea level indicated? YES - Go to step 3 . NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  3. Clear the DTC with the HDS.
  4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  5. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 4th gear) Throttle position between 14 degrees and 45 degrees for 2 seconds
  6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 7 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 . and recheck.
  7. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  8. Reset the ECM/PCM with the HDS.
  9. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  10. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2227 is indicated, check for poor connections or loose terminals at the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2228: BARO Sensor Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 53 kPa (15.6 In.Hg, 397 mmHg), or 1.58 V or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time.
  3. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  4. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2228 is indicated, check for poor connections or loose terminals at the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2229: BARO Sensor Circuit High Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.2 in.Hg, 1,200 mmHg), or 4.5 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time.
  3. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  4. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2229 is indicated, check for poor connections or loose terminals at the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2237, P2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit High Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 201

Scheme 201: DTC P2237, P2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2004-2005 Models); Fro
Scheme 201: DTC P2237, P2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2004-2005 Models); Fro

Scheme 202

Scheme 202
Scheme 202

Scheme 203

Scheme 203
Scheme 203
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 7 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B14 (B22)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B14 (B22)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B14 (B22)* and D10. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) . )
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2237 and/or P2240* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2237 and/or P2240* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2237, 2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit High Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 204

Scheme 204: DTC P2237, 2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2006 Model); Front A/F
Scheme 204: DTC P2237, 2240: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage (2006 Model); Front A/F

Scheme 205

Scheme 205
Scheme 205

Scheme 206

Scheme 206
Scheme 206
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 7 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B14 (B22)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B14 (B22)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B14 (B22)* and C12. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2237 and/or P2240* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2237 and/or P2240* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit Low Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 207

Scheme 207: DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2004-2005 Models); Fron
Scheme 207: DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2004-2005 Models); Fron

Scheme 208

Scheme 208
Scheme 208
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B14 (B22)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B14 (B22)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  12. Measure voltage between ECM/PCM connector terminals B14 (B22)* and D10. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs Indicated? YES - If DTC P2238 and/or P2241* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the screen Indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2238 and/or P2241* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) IP Circuit Low Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 209

Scheme 209: DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2006 Model); Front A/F
Scheme 209: DTC P2238, P2241: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage (2006 Model); Front A/F

Scheme 210

Scheme 210
Scheme 210
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B14 (B22)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B14 (B22)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  12. Measure voltage between ECM/PCM connector terminals B14 (B22)* and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2238 and/or P2241* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2238 and/or P2241* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 211

Scheme 211: DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models);
Scheme 211: DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2004-2005 Models);

Scheme 212

Scheme 212
Scheme 212

Scheme 213

Scheme 213
Scheme 213
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 8 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B13 (B21)* and D10. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2243 and/or P2247* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2243 and/or P2247* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 214

Scheme 214: DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2006 Model); Front
Scheme 214: DTC P2243, P2247: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage (2006 Model); Front

Scheme 215

Scheme 215
Scheme 215

Scheme 216

Scheme 216
Scheme 216
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 8 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B13 (B21)* and C12. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2243 and/or P2247* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2243 and/or P2247* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 217

Scheme 217: DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models); F
Scheme 217: DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2004-2005 Models); F

Scheme 218

Scheme 218
Scheme 218
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Measure voltage between ECM/PCM connector terminals B13 (B21)* and D10. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2245 and/or P2249* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2245 and/or P2249* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit Low Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 219

Scheme 219: DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2006 Model); Front A
Scheme 219: DTC P2245, P2249: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage (2006 Model); Front A

Scheme 220

Scheme 220
Scheme 220
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Measure voltage between ECM/PCM connector terminals B13 (B21)* and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2245 and/or P2249* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2245 and/or P2249* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit High Voltage (2004-2005 Models)

Note. If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 221

Scheme 221: DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2004-2005 Models); Fro
Scheme 221: DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2004-2005 Models); Fro

Scheme 222

Scheme 222
Scheme 222

Scheme 223

Scheme 223
Scheme 223
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B12 (B20)* and D10. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2251 and/or P2254* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2251 and/or P2254* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit High Voltage (2006 Model)

Note. If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154* troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 224

Scheme 224: DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2006 Model); Front A/F
Scheme 224: DTC P2251, P2254: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage (2006 Model); Front A/F

Scheme 225

Scheme 225
Scheme 225

Scheme 226

Scheme 226
Scheme 226
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B12 (B20)* and C12. Is there about 0.2 V or less? YES - Go to step 21 . NO - Go to step 14 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2251 and/or P2254* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 20 .
  20. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 . and recheck.
  21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2251 and/or P2254* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2004-2005 models); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit Low Voltage (2004-2005 models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 227

Scheme 227: DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2004-2005 models); Fron
Scheme 227: DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2004-2005 models); Fron

Scheme 228

Scheme 228
Scheme 228
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  12. Measure voltage between ECM/PCM connector terminals B12 (B20)* and D10. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ECM/PCM idle learn procedure ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2252 and/or P2255* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2252 and/or P2255* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) VS Circuit Low Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 229

Scheme 229: DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2006 Model); Front A/F
Scheme 229: DTC P2252, P2255: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage (2006 Model); Front A/F

Scheme 230

Scheme 230
Scheme 230
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B12 (B20) *) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10 .
  10. Reconnect ECM/PCM connector B (24P).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  12. Measure voltage between ECM/PCM connector terminals B12 (B20) and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13 .
  13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  14. Reconnect all connectors.
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2252 and/or P2255* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 19 .
  19. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 17 . and recheck.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2252 and/or P2255* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2270, P2271, P2272, P2273: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean (2005-2006 Models); Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Rich (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean (2005-2006 Models); Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Rich (2005-2006 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) Vehicle speed between 35 mph (56 km/h) and 55 mph (88 km/h) Drive 1 minute or more
  5. Monitor the OBD STATUS for DTC P2270, P2271, P2272* and/or P2273* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) Vehicle speed between 35 mph (56 km/h) and 55 mph (88 km/h) Drive 1 minute or more
  13. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2270, P2271, P2272* and/or P2273* is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 14 .
  14. Monitor the OBD STATUS for DTC P2270, P2271, P2272* and/or P2273* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 . and recheck.

DTC P2610: ECM/PCM Ignition Off Internal Timer Malfunction (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2610 indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Intermittent failure, system is OK at this time.

DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 231

Scheme 231: DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models); F
Scheme 231: DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2004-2005 Models); F

Scheme 232

Scheme 232
Scheme 232
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2627 and/or P2630* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect ECM/PCM connector B (24P).
  8. Check for continuity between ECM/PCM connector terminal B10 (B19)* and body ground. Is there continuity? YES - Go to step 9 . NO - Go to step 17 .
  9. Disconnect the A/F sensor (Sensor 1) 8P connector.
  10. Check for continuity between ECM/PCM connector terminal B10 (B19)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B10 (B19)*) and the A/F sensor (Sensor 1), then go to step 12 . NO - Go to step 11 .
  11. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  12. Reconnect all connectors.
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  16. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2627 and/or P2630* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  17. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2627 and/or P2630* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 233

Scheme 233: DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2006 Model); Front A
Scheme 233: DTC P2627, P2630: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage (2006 Model); Front A

Scheme 234

Scheme 234
Scheme 234
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2627 and/or P2630* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect ECM/PCM connector D (17P).
  8. Check for continuity between ECM/PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Go to step 9 . NO - Go to step 17 .
  9. Disconnect the A/F sensor (Sensor 1) 8P connector.
  10. Check for continuity between ECM/PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D11 (D10)*) and the A/F sensor (Sensor 1), then go to step 12 . NO - Go to step 11 .
  11. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  12. Reconnect all connectors.
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  16. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2627 and/or P2630* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  17. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  18. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2627 and/or P2630* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 235

Scheme 235: DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models);
Scheme 235: DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2004-2005 Models);

Scheme 236

Scheme 236
Scheme 236

Scheme 237

Scheme 237
Scheme 237
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2628 and/or P2631* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector B (24P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 4 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal B10 (B19)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (B10 (B19)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals B10 (B19)* and D10. Is there about 5 V? YES - Go to step 14 . NO - Go to step 20 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2628 and/or P2631* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES -If DTC P2628 and/or P2631* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2006 Model); Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage (2006 Model)

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 238

Scheme 238: DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2006 Model); Front
Scheme 238: DTC P2628, P2631: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage (2006 Model); Front

Scheme 239

Scheme 239
Scheme 239

Scheme 240

Scheme 240
Scheme 240
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2628 and/or P2631* indicated? YES - Go to step 5 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
  5. Turn the ignition switch OFF.
  6. Jump the SCS line with the HDS.
  7. Disconnect the A/F sensor (Sensor 1) 8P connector.
  8. Disconnect ECM/PCM connector D (17P).
  9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 4 to body ground with a jumper wire.
  10. Check for continuity between ECM/PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between the ECM/PCM (D11 (D10)*) and the A/F sensor (Sensor 1), then go to step 15 .
  11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector C (22P).
  12. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
  13. Measure voltage between ECM/PCM connector terminals D11 (D10)* and C22. Is there about 5 V? YES - Go to step 14 . NO - Go to step 20 .
  14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  15. Reconnect all connectors.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2628 and/or P2631* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2628 and/or P2631* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2A00, P2A03: Rear A/F Sensor (Bank 1, Sensor 1) Circuit Range/Performance Problem; Front A/F Sensor (Bank 2, Sensor 1) Circuit Range/Performance Problem

Note. Information marked with an asterisk (*) applies to the front bank (Bank 2). Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 3rd gear) Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,600 rpm or less Drive at an engine speed of 1,600 rpm. Accelerate to full open throttle for 5 seconds, then slow down with the throttle completely closed.
  5. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6 . NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If it is EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 . and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) .
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  11. Test-drive under these conditions: Engine coolant temperature above 158°F (70°C) A/T in D position (M/T in 3rd gear) Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,600 rpm or less Drive at an engine speed of 1,600 rpm. Accelerate to full open throttle for 5 seconds, then slow down with the throttle completely closed.
  12. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2A00 and/or P2A03* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to step 13 .
  13. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 . and recheck.

DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2004-2005 Models); F-CAN Malfunction (Gauge Control Module-ECM/PCM) (2004-2005 Models)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 241

Scheme 241: DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2004-2005 Models); F-CAN Malfunction (Gauge Control M
Scheme 241: DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2004-2005 Models); F-CAN Malfunction (Gauge Control M

Scheme 242

Scheme 242
Scheme 242
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, the navigation unit, and the ECM/PCM.
  4. Check for DTCs in the body electrical system DTCs menu with the HDS. Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 5 . NO - Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ).
  5. Turn the ignition switch OFF.
  6. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system) ).
  7. Disconnect the gauge control module 30P connector.
  8. Disconnect the VSA modulator-control unit 47P connector.
  9. If equipped with navigation system, disconnect the navigation unit 20P connector.
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector A (31P).
  12. Check for continuity between ECM/PCM connector terminals A15, A26, and body ground individually. Is there continuity? YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the navigation unit, and the ECM/PCM (A15 (A26)*), then go to step 17 . NO - Go to step 13 .
  13. Check for continuity between ECM/PCM connector terminals A15 and A26. Is there continuity? YES - Repair short in the wire between ECM/PCM A15 (CANL line) and A26 (CANL line), then go to step 17 . NO - Go to step 14 .
  14. Check for continuity between ECM/PCM connector terminal A15 and these connector terminals: ECM/PCM CONNECTOR TERMINAL SPECIFICATION Connector Terminal Gauge control module 30P No. 13 (WHT) VSA modulator-control unit 47P No. 14 (WHT) Navigation unit 20P No. 8 (WHT) Is there continuity between the ECM/PCM terminal and each of the terminals in the table? YES - Go to step 15 . NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 17 .
  15. Check for continuity between ECM/PCM connector terminal A26 and these connector terminals: ECM/PCM CONNECTOR TERMINAL SPECIFICATION Connector Terminal Gauge control module 30P No. 14 (RED) VSA modulator-control unit 47P No. 30 (RED) Navigation unit 20P No. 18 (RED) Is there continuity between the ECM/PCM terminal and each of the terminals in the table? YES - Go to step 16 . NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 17 .
  16. Using the «PGM-FI, VSA, AND Body ELECTRICAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) , select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, and Body Electrical systems: Check connections at the control module indicated in the last column. If all the connections are OK, substitute another control module. After substituting the control module, go to step 17 and recheck. PGM-FI, VSA, AND Body ELECTRICAL SPECIFICATION PGM-FI VSA Body Electrical Control module U0155 86-1 B1168 B1169 B1178 Gauge Control Module U0073 U0122 U0155 68-1 86-1 B1168 B1169 B1178 ECM/PCM U0073 U0122 U0155 68-1 86-1 B1168 B1178 VSA modulator-control unit Are the DTCs still indicated? YES - Substitute the remaining control modules, one at time, until the DTCs are no longer present, then replace the control module that made the DTCs go away. After replacing the faulty control module, go to step 17 . NO - Replace the faulty control module, then go to step 17 .
  17. Reconnect all the connectors.
  18. Turn the ignition switch ON (II).
  19. Reset the ECM/PCM with the HDS.
  20. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  21. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, the navigation unit, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2006 Model); F-CAN Malfunction (Gauge Control Module-ECM/PCM) (2006 Model)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 243

Scheme 243: DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2006 Model); F-CAN Malfunction (Gauge Control Module-
Scheme 243: DTC U0073, U0155: F-CAN Malfunction (BUS-OFF) (2006 Model); F-CAN Malfunction (Gauge Control Module-

Scheme 244

Scheme 244
Scheme 244
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, the TPMS control unit, the navigation unit, and the ECM/PCM.
  4. Check for DTCs in the body electrical system DTCs menu with the HDS. Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 5 . NO - Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ).
  5. Turn the ignition switch OFF.
  6. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system) ).
  7. Disconnect the gauge control module 30P connector.
  8. Disconnect the VSA modulator-control unit 47P connector.
  9. Disconnect the TPMS control unit 20P connector.
  10. If equipped with navigation system, disconnect the navigation unit 20P connector.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector E (31P).
  13. Check for continuity between ECM/PCM connector terminals E15, E26, and body ground individually. Is there continuity? YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the TPMS control unit, the navigation unit, and the ECM/PCM (E15 (E26)*), then go to step 18 . NO - Go to step 14 .
  14. Check for continuity between ECM/PCM connector terminals E15 and E26. Is there continuity? YES -Repair short in the wire between the ECM/PCM E15 (CANL line) and E26 (CANL line), then go to step 18 . NO - Go to step 15 .
  15. Check for continuity between ECM/PCM connector terminal E15 and these connector terminals: ECM/PCM CONNECTOR TERMINAL SPECIFICATION Connector Terminal Gauge control module 30P No. 13 (WHT) VSA modulator-control unit 47P No. 14 (WHT) Navigation unit 20P No. 8 (WHT) TPMS control unit 20P No. 19 (WHT) Is there continuity between the ECM/PCM terminal and each of the terminals in the table? YES - Go to step 16 . NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 18 .
  16. Check for continuity between ECM/PCM connector terminal E26 and these connector terminals: ECM/PCM CONNECTOR TERMINAL SPECIFICATION Connector Terminal Gauge control module 30P No. 14 (RED) VSA modulator-control unit 47 P No. 30 (RED) Navigation unit 20P No. 18 (RED) TPMS control unit 20P No. 10 (RED) Is there continuity between the ECM/PCM terminal and each of the terminals in the table? YES - Go to step 17 . NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 18 .
  17. Using the «PGM-FI, VSA, TPMS, AND BODY ELECTRICAL SPECIFICATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) , select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, TPMS, and Body Electrical systems: Check connections at the control module indicated in the last column. If all the connections are OK, substitute another control module. After substituting the control module, go to step 18 and recheck. PGM-FI, VSA, TPMS, AND BODY ELECTRICAL SPECIFICATION PGM-FI VSA TPMS Body Electrical Control module U0155 86-1 85 B1168 B1169 B1178 Gauge Control Module U0073 U0122 U0155 68-1 86-1 85 B1168 B1169 B1178 ECM/PCM U0073 U0122 U0155 68-1 86-1 85 B1168 B1178 VSA modulator-control unit U0073 U0155 68-1 86-1 85 B1168 B1178 TPMS control unit Are the DTCs still indicated? YES -Substitute the remaining control modules, one at time, until the DTCs are no longer present, then replace the control module that made the DTCs go away. After replacing the faulty control module, go to step 18 . NO - Replace the faulty control module, then go to step 18 .
  18. Reconnect all the connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  22. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, the TPMS control unit, the navigation unit, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2004-2005 Models)

Note. If DTC U0073 is stored at the same time as DTC U0122, troubleshoot DTC U0073 first, then recheck for DTC U0122. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 245

Scheme 245: DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2004-2005 Models)
Scheme 245: DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2004-2005 Models)

Scheme 246

Scheme 246
Scheme 246

Scheme 247

Scheme 247
Scheme 247
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, and the ECM/PCM.
  4. Check for a DTC in the VSA DTCs MENU with the HDS. Is VSA DTC 86 indicated? YES - Go to step 5 . NO - Go to step 8 .
  5. Turn the ignition switch OFF.
  6. Disconnect the VSA modulator-control unit 47P connector.
  7. Check for continuity between VSA modulator-control unit 47P connector terminals No. 14 and No. 30. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 . and recheck. If no DTCs are indicated, replace the original VSA modulator-control unit, then go to step 15 . NO - Repair open in the wire between the VSA modulator-control unit (No. 14 (No. 30)*) and the ECM/PCM (A15 (A26)*), then go to step 15 .
  8. Check for a poor connection at the VSA modulator-control unit 47P connector. Are the connections OK? YES - Go to step 9 . NO - Repair the connection(s), then go to step 15 .
  9. Turn the ignition switch OFF.
  10. Disconnect the VSA modulator-control unit 47P connector.
  11. Turn the ignition switch ON (II).
  12. Measure voltage between VSA modulator-control unit 47P connector terminal No. 38 and body ground. Is there battery voltage? YES - Go to step 13 . NO - Check the No. 21 IG METER (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 21 IG METER (7.5 A) fuse and the VSA modulator-control unit, then go to step 15 .
  13. Turn the ignition switch OFF.
  14. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 and recheck. If no DTCs are indicated, replace the original VSA modulator-control unit, then go to step 15 . NO - Repair open in the wire between the VSA modulator-control unit and G203, then go to step 15 .
  15. Reconnect the VSA modulator-control unit 47P connector.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0122 is indicated, check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2006 Model)

Note. If DTC U0073 is stored at the same time as DTC U0122, troubleshoot DTC U0073 first, then recheck for DTC U0122. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the GENERAL TROUBLESHOOTING INFORMATION .

Scheme 248

Scheme 248: DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2006 Model)
Scheme 248: DTC U0122: F-CAN Malfunction (VSA-ECM/PCM) (2006 Model)

Scheme 249

Scheme 249
Scheme 249

Scheme 250

Scheme 250
Scheme 250
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES - Go to step 4 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, and the ECM/PCM.
  4. Check for a DTC in the VSA DTCs MENU with the HDS. Is VSA DTC 86 indicated? YES - Go to step 5 . NO - Go to step 8 .
  5. Turn the ignition switch OFF.
  6. Disconnect the VSA modulator-control unit 47P connector.
  7. Check for continuity between VSA modulator-control unit 47P connector terminals No. Hand No. 30. Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 . and recheck. If no DTCs are indicated, replace the original VSA modulator-control unit, then go to step 15 . NO - Repair open in the wire between the VSA modulator-control unit (No. 14 (No. 30)*) and the ECM/PCM (E15 (E26)*), then go to step 15 .
  8. Check for a poor connection at the VSA modulator-control unit 47P connector. Are the connections OK? YES - Go to step 9 . NO - Repair the connection(s), then go to step 15 .
  9. Turn the ignition switch OFF.
  10. Disconnect the VSA modulator-control unit 47P connector.
  11. Turn the ignition switch ON (II).
  12. Measure voltage between VSA modulator-control unit 47P connector terminal No. 38 and body ground. Is there battery voltage? YES - Go to step 13 . NO - Check the No. 21 IG METER (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 21 IG METER (7.5 A) fuse and the VSA modulator-control unit, then go to step 15 .
  13. Turn the ignition switch OFF.
  14. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 and recheck. If no DTCs are indicated, replace the original VSA modulator-control unit, then go to step 15 . NO - Repair open in the wire between the VSA modulator-control unit and G203, then go to step 15 .
  15. Reconnect the VSA modulator-control unit 47P connector.
  16. Turn the ignition switch ON (II).
  17. Reset the ECM/PCM with the HDS.
  18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs Indicated? YES - If DTC U0122 is indicated, check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

Scheme 251

Scheme 251: 2004-2005 Models
Scheme 251: 2004-2005 Models

Scheme 252

Scheme 252
Scheme 252

Scheme 253

Scheme 253
Scheme 253

Scheme 254

Scheme 254
Scheme 254

Scheme 255

Scheme 255
Scheme 255

Scheme 256

Scheme 256
Scheme 256

Scheme 257

Scheme 257
Scheme 257

Scheme 258

Scheme 258
Scheme 258

Scheme 259

Scheme 259
Scheme 259

Scheme 260

Scheme 260
Scheme 260

Scheme 261

Scheme 261
Scheme 261

Scheme 262

Scheme 262
Scheme 262

Scheme 263

Scheme 263
Scheme 263

Scheme 264

Scheme 264
Scheme 264

Scheme 265

Scheme 265
Scheme 265

Scheme 266

Scheme 266
Scheme 266

Scheme 267

Scheme 267
Scheme 267

Scheme 268

Scheme 268
Scheme 268

Scheme 269

Scheme 269
Scheme 269

Scheme 270

Scheme 270
Scheme 270

Scheme 271

Scheme 271
Scheme 271

Scheme 272

Scheme 272
Scheme 272

Scheme 273

Scheme 273
Scheme 273

Scheme 274

Scheme 274
Scheme 274

Scheme 275

Scheme 275
Scheme 275

Scheme 276

Scheme 276
Scheme 276

Scheme 277

Scheme 277
Scheme 277

Scheme 278

Scheme 278
Scheme 278

Scheme 279

Scheme 279
Scheme 279

Scheme 280

Scheme 280
Scheme 280

Scheme 281

Scheme 281
Scheme 281

Scheme 282

Scheme 282
Scheme 282

Scheme 283

Scheme 283
Scheme 283
  1. Turn the ignition switch ON (II).
  2. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Does the MIL indicator flash? YES - Go to step 3 . NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
  3. Turn the ignition switch OFF.
  4. Turn the ignition switch ON (II), and watch the MIL. Does the MIL stay off? YES - Go to step 17 . NO - Go to step 5 .
  5. Turn the ignition switch OFF.
  6. Turn the ignition switch ON (II), wait 20 seconds, and watch the MIL. Does the MIL stay on or flash more than 5 times? YES - Go to step 7 . NO - The MIL circuit is OK.
  7. Turn the ignition switch OFF.
  8. Connect the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  9. Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the ECM/PCM? YES - Go to step 10 . NO - Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
  10. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to the indicated DTC's troubleshooting. NO - Go to step 11 .
  11. Check the MIL in the DATA LIST with the HDS. Does it indicate ON? YES - Go to step 12 . NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
  12. Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES - Go to step 13 . NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HDS.
  15. Disconnect ECM/PCM connector A (31P), then disconnect the HDS.
  16. Check for continuity between ECM/PCM connector terminal A16 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A16) and the DLC. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  17. Try to start the engine. Does the engine start and idle smoothly? YES - Go to step 18 . NO - Go to step 22 .
  18. Turn the ignition switch OFF.
  19. Connect the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  20. Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the ECM/PCM? YES - Go to step 21 . NO - Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) (see ).
  21. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to the indicated DTC's troubleshooting. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  22. Turn the ignition switch OFF.
  23. Inspect the No. 23 +B IG MAIN (50 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Repair open in the wire between the No. 23 +B IG MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 24 . NO - Repair short in the wire between No. 23 +B IG MAIN (50 A) fuse and the under-dash fuse/relay box. Also replace the No. 23 +B IG MAIN (50 A) fuse.
  24. Inspect the No. 8 Fl ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 31 . NO - Go to step 25 .
  25. Remove the blown No. 8 Fl ECU (ECM/PCM) (15 A) fuse from the under-dash fuse/relay box.
  26. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  27. Check for continuity between body ground and PGM-FI main relay 1 (FI MAIN) 4P connector terminals No. 2 and No. 3 individually. Is there continuity? YES - Repair short in the wire between the No. 8 Fl ECU (PCM) (15 A) and PGM-FI main relay 1 (FI MAIN). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Go to step 28 .
  28. Disconnect each of the components or connectors below, one at a time, and check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and body ground. PGM-FI main relay 2 (FUEL PUMP) ECM/PCM connector E (31P) Each injector 2P connector Camshaft position (CMP) sensor 3P connector Crankshaft position (CKP) sensor A/B 6P connector A/F sensor relay Radiator fan relay Throttle actuator control module relay Does continuity go away when one of the above components is disconnected? YES - Replace the component that made the short to body ground go away when disconnected. If the item is the ECM/PCM, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Go to step 29 .
  29. Disconnect the connectors from these components: PGM-FI main relay 2 (FUEL PUMP) ECM/PCM connector E (31P) Injectors Camshaft position (CMP) sensor Crankshaft position (CKP) sensor A/B A/F sensor relay Radiator fan relay Throttle actuator control module relay
  30. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between PGM-FI main relay 1 (FI MAIN) and each item. Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Replace PGM-FI main relay 1 (FI MAIN). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse.
  31. Inspect the No. 19 IG FUEL PUMP (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 44 . NO - Go to step 32 .
  32. Remove the blown No. 19 IG FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.
  33. Jump the SCS line with the HDS.
  34. Disconnect ECM/PCM connector E (31P).
  35. Check for continuity between ECM/PCM connector terminal E5 and body ground. Is there continuity? YES - Go to step 36 . NO - Replace the No. 19 IG FUEL PUMP (15 A) fuse, and update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  36. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-hood fuse/relay box.
  37. Check for continuity between ECM/PCM connector terminal E5 and body ground. Is there continuity? YES - Repair short in the wire between the No. 19 IG FUEL PUMP (15 A) fuse and the ECM/PCM (E5), or between the No. 19 IG FUEL PUMP (15 A) fuse and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Go to step 38 .
  38. Remove the trunk floor trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ).
  39. Remove the access panel from the floor.
  40. Disconnect fuel pump 5P connector.
  41. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground. Is there continuity? YES -Repair short in the wire between the fuel pump and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Go to step 42 .
  42. Reinstall PGM-FI main relay 2 (FUEL PUMP) (A).
  43. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground. Is there continuity? YES - Replace PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Check the fuel pump, and replace it if necessary (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ). Also replace the No. 19 IG FUEL PUMP (15 A) fuse.
  44. Jump the SCS line with the HDS.
  45. Disconnect ECM/PCM connector E (31P).
  46. Turn the ignition switch ON (II).
  47. Measure voltage between ECM/PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 48 . NO - Repair open in the wire between the No. 19 IG FUEL PUMP (15 A) fuse and the ECM/PCM (E5).
  48. Measure voltage between ECM/PCM connector terminal A5 and body ground. Is there battery voltage? YES - Go to step 53 . NO - Go to step 49 .
  49. Turn the ignition switch OFF.
  50. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  51. Measure voltage between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 52 . NO - Repair open in the wire between the No. 8 Fl ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (FI MAIN).
  52. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 4 and ECM/PCM connector terminal A5. Is there continuity? YES - Test PGM-FI main relay 1 (FI MAIN) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM (A5).
  53. Reconnect ECM/PCM connector E (31P).
  54. Turn the ignition switch ON (II).
  55. Measure voltage between body ground and ECM/PCM connector terminal E4. Is there battery voltage? YES -Go to step 62 . NO - Go to step 56 .
  56. Turn the ignition switch OFF.
  57. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  58. Turn the ignition switch ON (II).
  59. Measure voltage between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 60 . NO - Repair open in the wire between the No. 8 Fl ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (FI MAIN).
  60. Turn the ignition switch OFF.
  61. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and ECM/PCM connector terminal E4. Is there continuity? YES - Replace PGM-FI main relay 1 (FI MAIN). NO - Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM (E4).
  62. Measure voltage between body ground and ECM/PCM connector terminals B15, E1, E2, and E3 individually. Is there more than 0.2 V? YES - Repair open in the wire(s) that had more than 0.2 V between G101 and the ECM/PCM (B15, E1, E2, E3). NO - Go to step 63 .
  63. Measure voltage between ECM/PCM connector terminal D6 and body ground. Is there about 5 V? YES - Go to step 71 . NO - Go to step 64 .
  64. Turn the ignition switch OFF.
  65. Disconnect the connector from each of these sensors, one at a time, and measure voltage between ECM/PCM connector terminal D6 and body ground with the ignition switch ON (II). MAP sensor Output shaft (countershaft) speed sensor Is there about 5 V? YES - Replace the sensor that restored 5 V when disconnected. NO - Go to step 66 .
  66. Turn the ignition switch OFF.
  67. Jump the SCS line with the HDS.
  68. Disconnect the connectors from these sensors: MAP sensor Output shaft (countershaft) speed sensor
  69. Disconnect ECM/PCM connector D (17P).
  70. Check for continuity between ECM/PCM connector terminal D6 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D6) and the MAP sensor, or the output shaft (countershaft) speed sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  71. Measure voltage between ECM/PCM connector terminal D12 and body ground. Is there about 5 V? YES - Go to step 79 . NO - Go to step 72 .
  72. Turn the ignition switch OFF.
  73. Disconnect the connector from each of these parts, one at a time, and measure voltage between ECM/PCM connector terminal D12 and body ground with the ignition switch ON (II). APP sensor B Input shaft (mainshaft) speed sensor IMT actuator assembly EGR valve Is there about 5 V? YES - Replace the part that restored 5 V when disconnected. NO - Go to step 74 .
  74. Turn the ignition switch OFF.
  75. Jump the SCS line with the HDS.
  76. Disconnect the connectors from these parts: APP sensor Input shaft (mainshaft) speed sensor IMT actuator assembly EGR valve
  77. Disconnect ECM/PCM connector D (17P).
  78. Check for continuity between ECM/PCM connector terminal D12 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D12) and APP sensor B, the input shaft (mainshaft) speed sensor, the IMT actuator assembly, or the EGR valve. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  79. Measure voltage between ECM/PCM connector terminal D2 and body ground. Is there about 5 V? YES - Go to step 86 . NO - Go to step 80 .
  80. Turn the ignition switch OFF.
  81. Disconnect APP sensor A/B 6P connector, and measure voltage between ECM/PCM connector terminal D2 and body ground with the ignition switch ON (II). Is there about 5 V? YES - Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ). NO - Go to step 82 .
  82. Turn the ignition switch OFF.
  83. Jump the SCS line with the HDS.
  84. Disconnect ECM/PCM connector D (17P).
  85. Check for continuity between ECM/PCM connector terminal D2 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D2) and APP sensor A. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  86. Measure voltage between ECM/PCM connector terminal A12 and body ground. Is there about 5 V? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 87 .
  87. Turn the ignition switch OFF.
  88. Disconnect the FTP sensor 3P connector, and measure voltage between ECM/PCM connector terminal A12 and body ground with the ignition switch ON (II). Is there about 5 V? YES - Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#evap-system) ). NO - Go to step 89 .
  89. Turn the ignition switch OFF.
  90. Jump the SCS line with the HDS.
  91. Disconnect ECM/PCM connector A (31P).
  92. Check for continuity between ECM/PCM connector terminal A12 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A12) and the FTP sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

Scheme 284

Scheme 284: 2006 Model
Scheme 284: 2006 Model

Scheme 285

Scheme 285
Scheme 285

Scheme 286

Scheme 286
Scheme 286

Scheme 287

Scheme 287
Scheme 287

Scheme 288

Scheme 288
Scheme 288

Scheme 289

Scheme 289
Scheme 289

Scheme 290

Scheme 290
Scheme 290

Scheme 291

Scheme 291
Scheme 291

Scheme 292

Scheme 292
Scheme 292

Scheme 293

Scheme 293
Scheme 293

Scheme 294

Scheme 294
Scheme 294

Scheme 295

Scheme 295
Scheme 295

Scheme 296

Scheme 296
Scheme 296

Scheme 297

Scheme 297
Scheme 297

Scheme 298

Scheme 298
Scheme 298

Scheme 299

Scheme 299
Scheme 299

Scheme 300

Scheme 300
Scheme 300

Scheme 301

Scheme 301
Scheme 301

Scheme 302

Scheme 302
Scheme 302

Scheme 303

Scheme 303
Scheme 303

Scheme 304

Scheme 304
Scheme 304

Scheme 305

Scheme 305
Scheme 305

Scheme 306

Scheme 306
Scheme 306

Scheme 307

Scheme 307
Scheme 307

Scheme 308

Scheme 308
Scheme 308

Scheme 309

Scheme 309
Scheme 309

Scheme 310

Scheme 310
Scheme 310

Scheme 311

Scheme 311
Scheme 311

Scheme 312

Scheme 312
Scheme 312

Scheme 313

Scheme 313
Scheme 313

Scheme 314

Scheme 314
Scheme 314

Scheme 315

Scheme 315
Scheme 315

Scheme 316

Scheme 316
Scheme 316
  1. Turn the ignition switch ON (II).
  2. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Does the MIL indicator flash? YES - Go to step 3 . NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
  3. Turn the ignition switch OFF.
  4. Turn the ignition switch ON (II), and watch the MIL. Does the MIL stay off? YES - Go to step 17 . NO - Go to step 5 .
  5. Turn the ignition switch OFF.
  6. Turn the ignition switch ON (II), wait 20 seconds, and watch the MIL. Does the MIL stay on or flash more than 5 times? YES - Go to step 7 . NO - The MIL circuit is OK.
  7. Turn the ignition switch OFF.
  8. Connect the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  9. Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the ECM/PCM? YES - Go to step 10 . NO - Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
  10. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to the indicated DTC's troubleshooting. NO - Go to step 11 .
  11. Check the MIL in the DATA LIST with the HDS. Does it indicate ON? YES - Go to step 12 . NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
  12. Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES - Go to step 13 . NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HDS.
  15. Disconnect ECM/PCM connector E (31P), then disconnect the HDS.
  16. Check for continuity between ECM/PCM connector terminal E16 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E16) and the DLC. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  17. Try to start the engine. Does the engine start and idle smoothly? YES - Go to step 18 . NO - Go to step 22 .
  18. Turn the ignition switch OFF.
  19. Connect the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  20. Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the ECM/PCM? YES - Go to step 21 . NO - Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
  21. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to the indicated DTC's troubleshooting. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  22. Turn the ignition switch OFF.
  23. Inspect the No. 23 +B IG MAIN (50 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Repair open in the wire between the No. 23 +B IG MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 24 . NO - Repair short in the wire between No. 23 +B IG MAIN (50 A) fuse and the under-dash fuse/relay box. Also replace the No. 23 +B IG MAIN (50 A) fuse.
  24. Inspect the No. 8 Fl ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 31 . NO - Go to step 25 .
  25. Remove the blown No. 8 Fl ECU (ECM/PCM) (15 A) fuse from the under-dash fuse/relay box.
  26. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  27. Check for continuity between body ground and PGM-FI main relay 1 (FI MAIN) 4P connector terminals No. 2 and No. 3 individually. Is there continuity? YES - Repair short in the wire between the No. 8 Fl ECU (PCM) (15 A) and PGM-FI main relay 1 (FI MAIN). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Go to step 28 .
  28. Disconnect each of the components or connectors below, one at a time, and check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and body ground. PGM-FI main relay 2 (FUEL PUMP) ECM/PCM connector A (31P) Each injector 2P connector Camshaft position (CMP) sensor 3P connector Crankshaft position (CKP) sensor A/B 6P connector A/F sensor relay Radiator fan relay Throttle actuator control module relay Does continuity go away when one of the above components is disconnected? YES -Replace the component that made the short to body ground go away when disconnected. If the item is the ECM/PCM, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Go to step 29 .
  29. Disconnect the connectors from these components: PGM-FI main relay 2 (FUEL PUMP) ECM/PCM connector A (31P) Injectors Camshaft position (CMP) sensor Crankshaft position (CKP) sensor A/B A/F sensor relay Radiator fan relay Throttle actuator control module relay
  30. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between PGM-FI main relay 1 (FI MAIN) and each item. Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse. NO - Replace PGM-FI main relay 1 (FI MAIN). Also replace the No. 8 Fl ECU (ECM/PCM) (15 A) fuse.
  31. Inspect the No. 19 IG FUEL PUMP (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 44 . NO - Go to step 32 .
  32. Remove the blown No. 19 IG FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.
  33. Jump the SCS line with the HDS.
  34. Disconnect ECM/PCM connector D (17P).
  35. Check for continuity between ECM/PCM connector terminal D6 and body ground. Is there continuity? YES - Go to step 36 . NO - Replace the No. 19 IG FUEL PUMP (15 A) fuse, and update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  36. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-hood fuse/relay box.
  37. Check for continuity between ECM/PCM connector terminal D6 and body ground. Is there continuity? YES - Repair short in the wire between the No. 19 IG FUEL PUMP (15 A) fuse and the ECM/PCM (E5), or between the No. 19 IG FUEL PUMP (15 A) fuse and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Go to step 38 .
  38. Remove the trunk floor trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ).
  39. Remove the access panel from the floor.
  40. Disconnect fuel pump 5P connector.
  41. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground. Is there continuity? YES - Repair short in the wire between the fuel pump and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Go to step 42 .
  42. Reinstall PGM-FI main relay 2 (FUEL PUMP) (A).
  43. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground. Is there continuity? YES - Replace PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 IG FUEL PUMP (15 A) fuse. NO - Check the fuel pump, and replace it if necessary (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ). Also replace the No. 19 IG FUEL PUMP (15 A) fuse.
  44. Jump the SCS line with the HDS.
  45. Disconnect ECM/PCM connector D (17P).
  46. Turn the ignition switch ON (II).
  47. Measure voltage between ECM/PCM connector terminal D6 and body ground. Is there battery voltage? YES - Go to step 48 . NO - Repair open in the wire between the No. 19 IG FUEL PUMP (15 A) fuse and the ECM/PCM (D6).
  48. Measure voltage between ECM/PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 53 . NO - Go to step 49 .
  49. Turn the ignition switch OFF.
  50. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  51. Measure voltage between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 52 . NO - Repair open in the wire between the No. 8 Fl ECU (ECM/PCM) (15A) fuse and PGM-FI main relay 1 (FI MAIN).
  52. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 4 and ECM/PCM connector terminal E5. Is there continuity? YES - Test PGM-FI main relay 1 (FI MAIN) (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM (E5).
  53. Reconnect ECM/PCM connector A (31P).
  54. Turn the ignition switch ON (II).
  55. Measure voltage between body ground and ECM/PCM connector terminal A4. Is there battery voltage? YES - Go to step 62 . NO - Go to step 56 .
  56. Turn the ignition switch OFF.
  57. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (FI MAIN) (A) from the under-hood fuse/relay box.
  58. Turn the ignition switch ON
  59. Measure voltage between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 60 . NO - Repair open in the wire between the No. 8 Fl ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (FI MAIN).
  60. Turn the ignition switch OFF.
  61. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 1 and ECM/PCM connector terminal A4. Is there continuity? YES - Replace PGM-FI main relay 1 (FI MAIN). NO - Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM (A4).
  62. Measure voltage between body ground and ECM/PCM connector terminals B15, E1, E2, and E3 individually. Is there more than 0.2 V? YES - Repair open in the wire(s) that had more than 0.2 V between G101 and the ECM/PCM (B15, A1, A2, A3). NO - Go to step 63 .
  63. Measure voltage between ECM/PCM connector terminal C6 and body ground. Is there about 5 V? YES - Go to step 71 . NO - Go to step 64 .
  64. Turn the ignition switch OFF.
  65. Disconnect the connector from each of these sensors, one at a time, and measure voltage between ECM/PCM connector terminal C6 and body ground with the ignition switch ON (II). MAP sensor Output shaft (countershaft) speed sensor Is there about 5 V? YES - Replace the sensor that restored 5 V when disconnected. NO - Go to step 66 .
  66. Turn the ignition switch OFF.
  67. Jump the SCS line with the HDS.
  68. Disconnect the connectors from these sensors: MAP sensor Output shaft (countershaft) speed sensor
  69. Disconnect ECM/PCM connector C (22P).
  70. Check for continuity between ECM/PCM connector terminal C6 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C6) and the MAP sensor, or the output shaft (countershaft) speed sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  71. Measure voltage between ECM/PCM connector terminal C14 and body ground. Is there about 5 V? YES - Go to step 79 . NO - Go to step 72 .
  72. Turn the ignition switch OFF.
  73. Disconnect the connector from each of these parts, one at a time, and measure voltage between ECM/PCM connector terminal C14 and body ground with the ignition switch ON (II). APP sensor B Input shaft (mainshaft) speed sensor IMT actuator assembly EGR valve Is there about 5 V? YES - Replace the part that restored 5 V when disconnected. NO - Go to step 74 .
  74. Turn the ignition switch OFF.
  75. Jump the SCS line with the HDS.
  76. Disconnect the connectors from these parts: APP sensor Input shaft (mainshaft) speed sensor IMT actuator assembly EGR valve
  77. Disconnect ECM/PCM connector C (22P).
  78. Check for continuity between ECM/PCM connector terminal C14 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C14) and APP sensor B, the input shaft (mainshaft) speed sensor, the IMT actuator assembly, or the EGR valve. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  79. Measure voltage between ECM/PCM connector terminal D2 and body ground. Is there about 5 V? YES - Go to step 86 . NO - Go to step 80 .
  80. Turn the ignition switch OFF.
  81. Disconnect APP sensor A/B 6P connector, and measure voltage between ECM/PCM connector terminal D2 and body ground with the ignition switch ON (II). Is there about 5 V? YES - Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ). NO - Go to step 82 .
  82. Turn the ignition switch OFF.
  83. Jump the SCS line with the HDS.
  84. Disconnect ECM/PCM connector D (17P).
  85. Check for continuity between ECM/PCM connector terminal D2 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (D2) and APP sensor A. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).
  86. Measure voltage between ECM/PCM connector terminal E12 and body ground. Is there about 5 V? YES -Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 87 .
  87. Turn the ignition switch OFF.
  88. Disconnect the FTP sensor 3P connector, and measure voltage between ECM/PCM connector terminal E12 and body ground with the ignition switch ON (II). Is there about 5 V? YES - Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#evap-system) ). NO - Go to step 89 .
  89. Turn the ignition switch OFF.
  90. Jump the SCS line with the HDS.
  91. Disconnect ECM/PCM connector E (31P).
  92. Check for continuity between ECM/PCM connector terminal E12 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E12) and the FTP sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DLC Circuit Troubleshooting

Note. If the ECM/PCM does not communicate with the HDS, do this troubleshooting procedure. Check that MIL circuit is normal, then do this troubleshooting.

Scheme 317

Scheme 317: 2004-2005 Models
Scheme 317: 2004-2005 Models

Scheme 318

Scheme 318
Scheme 318

Scheme 319

Scheme 319
Scheme 319

Scheme 320

Scheme 320
Scheme 320

Scheme 321

Scheme 321
Scheme 321

Scheme 322

Scheme 322
Scheme 322

Scheme 323

Scheme 323
Scheme 323

Scheme 324

Scheme 324
Scheme 324
  1. Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 2 . NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 Fl ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box.
  2. Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 3 . NO - Repair open in the wire between DLC terminal No. 4 and body ground (G503).
  3. Measure voltage between DLC terminals No. 5 and No. 16. Is there battery voltage? YES - Go to step 4 . NO - Repair open in the wire between DLC terminal No. 5 and body ground (G503).
  4. Turn the ignition switch ON (II).
  5. Measure voltage between DLC terminals No. 5 and No. 7. Is there 8.5 V or more? YES - Go to step 11 . NO - Go to step 6 .
  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
  8. Disconnect ECM/PCM connector A (31P).
  9. Check for continuity between DLC terminal No. 7 and body ground. Is there continuity? YES - Repair short to ground in the wire between DLC terminal No. 7 and the ECM/PCM (A14). After repairing the wire, check for a DTC with the HDS and go to the indicated DTC's troubleshooting. NO - Go to step 10 .
  10. Check for continuity between DLC terminal No. 7 and ECM/PCM terminal A14. Is there continuity? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Repair open in the wire between DLC terminal No. 7 and the ECM/PCM (A14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS, and go to the indicated DTC's troubleshooting.
  11. Turn the ignition switch OFF.
  12. Jump the SCS line with the HDS.
  13. Disconnect ECM/PCM connector A (31P).
  14. Turn the ignition switch ON (II).
  15. Measure voltage between DLC terminals No. 5 and No. 7. Is there about 0V? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 16 .
  16. Turn the ignition switch OFF.
  17. Disconnect the VSA modulator-control unit 47P connector.
  18. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Repair short to power in the wire between DLC terminal No. 7 and the ECM/PCM (A14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Repair open in the wire between the VSA modulator-control unit and G203. After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

Note. If the ECM/PCM does not communicate with the HDS, do this troubleshooting procedure. Check that MIL circuit is normal, then do this troubleshooting.

Scheme 325

Scheme 325: 2006 Model
Scheme 325: 2006 Model

Scheme 326

Scheme 326
Scheme 326

Scheme 327

Scheme 327
Scheme 327

Scheme 328

Scheme 328
Scheme 328

Scheme 329

Scheme 329
Scheme 329

Scheme 330

Scheme 330
Scheme 330

Scheme 331

Scheme 331
Scheme 331

Scheme 332

Scheme 332
Scheme 332
  1. Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 2 . NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 Fl ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box.
  2. Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 3 . NO - Repair open in the wire between DLC terminal No. 4 and body ground (G503).
  3. Measure voltage between DLC terminals No. 5 and No. 16. Is there battery voltage? YES - Go to step 4 . NO - Repair open in the wire between DLC terminal No. 5 and body ground (G503).
  4. Turn the ignition switch ON (II).
  5. Measure voltage between DLC terminals No. 5 and No. 7. Is there 8.5 V or more? YES - Go to step 11 . NO - Go to step 6 .
  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
  8. Disconnect ECM/PCM connector E (31P).
  9. Check for continuity between DLC terminal No. 7 and body ground. Is there continuity? YES - Repair short to ground in the wire between DLC terminal No. 7 and the ECM/PCM (E14). After repairing the wire, check for a DTC with the HDS and go to the indicated DTC's troubleshooting. NO - Go to step 10 .
  10. Check for continuity between DLC terminal No. 7 and ECM/PCM terminal E14. Is there continuity? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/ indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Repair open in the wire between DLC terminal No. 7 and the ECM/PCM (E14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS, and go to the indicated DTC's troubleshooting.
  11. Turn the ignition switch OFF.
  12. Jump the SCS line with the HDS.
  13. Disconnect ECM/PCM connector E (31P).
  14. Turn the ignition switch ON (II).
  15. Measure voltage between DLC terminals No. 5 and No. 7. Is there about 0 V? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 16 .
  16. Turn the ignition switch OFF.
  17. Disconnect the VSA modulator-control unit 47P connector.
  18. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Repair short to power in the wire between DLC terminal No. 7 and the ECM/PCM (E14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Repair open in the wire between the VSA modulator-control unit and G203. After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

Scheme 333

Scheme 333: Injector Replacement
Scheme 333: Injector Replacement

Scheme 334

Scheme 334
Scheme 334
  1. Relieve fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
  2. Remove the intake manifold (see «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  3. Disconnect the connectors from the injectors (A).
  4. Disconnect the quick-connect fittings (B).
  5. Remove the fuel rail mounting bolts (C) from the fuel rail (D).
  6. Remove the injector clip (E) from the injector.
  7. Remove the injector from the fuel rail.
  8. Coat the new O-rings (A) with clean engine oil, and insert the injectors (B) into the fuel rail (C).
  9. Install the injector clip (D).
  10. Coat the new injector O-rings (E) with clean engine oil.
  11. Install the injectors in the injector base (F).
  12. Install the fuel rail mounting nuts.
  13. Connect the connectors on the injectors.
  14. Connect the quick-connect fittings (see «FUEL LINE/QUICK-CONNECT FITTING INSTALLATION»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-installation) ).
  15. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel rail will be pressurized. Repeat this two or three times, then check for fuel leakage.
  16. Install the intake manifold (see «INSTALLATION»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).

A/F Sensor Replacement

Special Tools Required

O2 sensor socket wrench, Snap-on YA8875, SP Tools 93750, or equivalent, commercially available

Scheme 335

Scheme 335: Front Bank (Bank 2)
Scheme 335: Front Bank (Bank 2)
  1. Disconnect the front A/F sensor 8P connector (A), then remove the A/F sensor (B).
  2. Install the front A/F sensor in the reverse order of removal.

Scheme 336

Scheme 336: Rear Bank (Bank 1)
Scheme 336: Rear Bank (Bank 1)
  1. Disconnect the rear A/F sensor 8P connector (A), then remove the rear A/F sensor (B).
  2. Install the rear A/F sensor in the reverse order of removal.

Secondary HO2S Replacement

Special Toots Required

O2 sensor socket wrench. Snap-on YA8875, SP Tools 93750, or equivalent, commercially available

Scheme 337

Scheme 337: Front Bank (Bank 2)
Scheme 337: Front Bank (Bank 2)
  1. Disconnect the front secondary HO2S 4P connector (A), then remove the front secondary HO2S (B).
  2. Install the front secondary HO2S in the reverse order of removal.

Scheme 338

Scheme 338: Rear Bank (Bank 1)
Scheme 338: Rear Bank (Bank 1)
  1. Disconnect the rear secondary HO2S 4P connector (A), then remove the rear secondary HO2S (B).
  2. Install the rear secondary HO2S in the reverse order of removal.

Scheme 339

Scheme 339: ECT Sensor Replacement
Scheme 339: ECT Sensor Replacement
  1. Drain the engine coolant (see «COOLANT CHECK»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ).
  2. Remove the air cleaner (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ).
  3. Disconnect the ECT sensor 2P connector (A).
  4. Remove the ECT sensor (B).
  5. Install the sensor in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 340

Scheme 340: IAT Sensor Replacement
Scheme 340: IAT Sensor Replacement
  1. Remove the intake manifold cover (see step 1 on «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  2. Disconnect the IAT sensor 2P connector (A).
  3. Remove the IAT sensor (B).
  4. Install the sensor in the reverse order of removal with a new O-ring (C).

Scheme 341

Scheme 341: MAP Sensor Replacement
Scheme 341: MAP Sensor Replacement
  1. Remove the intake manifold cover (see step 1 on «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  2. Disconnect the MAP sensor 3P connector (A).
  3. Remove the screw (B).
  4. Remove the MAP sensor (C).
  5. Install the sensor in the reverse order of removal with a new O-ring (D).

Scheme 342

Scheme 342: CKP Sensor Replacement
Scheme 342: CKP Sensor Replacement
  1. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
  2. Remove the drive belt auto-tensioner (see «DRIVE BELT AUTO-TENSIONER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ).
  3. Remove the upper cover (see step 10 on «TIMING BELT REMOVAL»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ) and lower (see step 11 on «TIMING BELT REMOVAL»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ) front covers from the engine.
  4. Remove the CKP sensor (A) from the oil pump.
  5. Install the sensor in the reverse order of removal.
  6. Do the CKP pattern clear/pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Scheme 343

Scheme 343: CMP Sensor Replacement
Scheme 343: CMP Sensor Replacement

Scheme 344

Scheme 344
Scheme 344
  1. Set the No. 1 piston at top dead center (see step 3 on «VALVE CLEARANCE ADJUSTMENT»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
  2. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
  3. Remove the upper (see step 10 on «TIMING BELT REMOVAL»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ) and lower (see step 11 on «TIMING BELT REMOVAL»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ) front covers from the engine.
  4. To hold the timing belt adjuster in its current position, thread in the battery clamp bolt hand-tight (see step 13 on «TIMING BELT REMOVAL»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head) ).
  5. Loosen the idler pulley bolt about five or six turns, then remove the timing belt from the front camshaft pulley (see step 16 on «TIMING BELT INSTALLATION»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
  6. Remove the front camshaft pulley (A).
  7. Disconnect the CMP sensor 3P connector (B), then remove the back cover (C).
  8. Remove the CMP sensor (A) from the back cover.
  9. Install the sensor in the reverse order of removal, then install the timing belt (see «TIMING BELT INSTALLATION»(/acura/tl/iii-2003-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
  10. Do the CKP pattern clear/pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Scheme 345

Scheme 345: Input Shaft (Mainshaft) Speed Sensor Replacement
Scheme 345: Input Shaft (Mainshaft) Speed Sensor Replacement
  1. Disconnect the input shaft (mainshaft) speed sensor 3P connector (A).
  2. Remove the input shaft (mainshaft) speed sensor (B).
  3. Install the sensor in the reverse order of removal with a new O-ring (C).

Scheme 346

Scheme 346: Output Shaft (Countershaft) Speed Sensor Replacement
Scheme 346: Output Shaft (Countershaft) Speed Sensor Replacement
  1. Disconnect the output shaft (countershaft) speed sensor 3P connector (A).
  2. Remove the output shaft (countershaft) speed sensor (B).
  3. Install the sensor in the reverse order of removal with a new O-ring (C).

Scheme 347

Scheme 347: Knock Sensor Replacement
Scheme 347: Knock Sensor Replacement
  1. Remove the intake manifold cover (see step 1 on «REMOVAL»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
  2. Remove the fuel rails and the injector base.
  3. Disconnect the knock sensor connector (A), then remove the knock sensor (B).
  4. Install the sensor in the reverse order of removal.

Scheme 348

Scheme 348: ECM/PCM Replacement
Scheme 348: ECM/PCM Replacement

Scheme 349

Scheme 349
Scheme 349
  1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
  2. Make sure the HDS communicates with the ECM/PCM. If it doesn't, skip steps 3 to 6 and 17 , and clean the throttle body (see «THROTTLE BODY TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), and replace the engine oil (see «OIL PRESSURE TEST»(/acura/tl/iii-2003-2006/remont/lubrication-system/#engine-lubrication__oil-pressure-test) ) after this procedure.
  3. Turn the ignition switch ON (II).
  4. Select the INSPECTION MENU with the HDS.
  5. Do the TP POSITION CHECK in the ETCS TEST.
  6. Select READ DATA in the REPLACE ECM/PCM with the HDS.
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Pull back the carpet.
  10. Remove the ducts (A).
  11. Disconnect ECM/PCM connectors (B).
  12. Remove the bolts (C), then remove the ECM/PCM (D).
  13. Install the ECM/PCM in the reverse order of removal.
  14. Open the SCS with the HDS.
  15. Turn the ignition switch ON (II). NOTE: For 2005-2006 models: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.
  16. 2005-2006 models: Input the VIN to the ECM/PCM with the HDS.
  17. Select WRITE DATA in the REPLACE ECM/PCM menu with the HDS.
  18. Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS; it allows you to start the engine.
  19. Reset the ECM/PCM with the HDS.
  20. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
  21. Do the CKP pattern clear/pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• ECM/PCM IDLE LEARN PROCEDURE
• HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM
• COOLANT CHECK
• RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING
• RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• POWER RELAY TEST
• FUEL PRESSURE TEST
• FUEL PRESSURE REGULATOR REPLACEMENT
• SPARK PLUG INSPECTION
• VTEC ROCKER ARM TEST
• REMOVAL
• TIMING BELT ADJUSTER REPLACEMENT
• ALTERNATOR REMOVAL AND INSTALLATION
• BATTERY TEST
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• REMOVAL AND INSTALLATION
• SELF-DIAGNOSTIC FUNCTION
• GAUGE CONTROL MODULE REPLACEMENT
• TRIM REMOVAL/INSTALLATION - TRUNK AREA
• FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT
• APP SENSOR REPLACEMENT
• FTP SENSOR REPLACEMENT
• FUEL PRESSURE RELIEVING
• FUEL LINE/QUICK-CONNECT FITTING INSTALLATION
• AIR CLEANER REMOVAL/INSTALLATION
• CRANKSHAFT PULLEY REMOVAL AND INSTALLATION
• VALVE CLEARANCE ADJUSTMENT
• TIMING BELT INSTALLATION
• OIL PRESSURE TEST
• DTC P0107
• DTC P0108
• DTC P0111
• DTC P0112
• DTC P0113
• DTC P0116
• DTC P0117
• DTC P0118
• DTC P0125
• DTC P0128
• DTC P0133
• DTC P0134
• DTC P0135
• DTC P0137
• DTC P0138
• DTC P0139
• DTC P0141
• DTC P0171
• DTC P0300
• DTC P0301
• DTC P0325
• DTC P0335
• DTC P0339
• DTC P0340
• DTC P0344
• DTC P0562
• DTC P0563
• DTC P0603
• DTC P0630
• DTC P0685
• DTC P0700
• DTC P0715
• DTC P0720
• DTC P1109
• DTC P1128
• DTC P1129
• DTC P1172, P1174
• DTC P1297
• DTC P1298
• DTC P1549
• DTC P16BB
• DTC P16BC
• DTC P2195, P2197
• DTC P2227
• DTC P2228
• DTC P2229
• DTC P2237, P2240
• DTC P2237, 2240
• DTC P2238, P2241
• DTC P2243, P2247
• DTC P2245, P2249
• DTC P2251, P2254
• DTC P2252, P2255
• DTC P2270, P2271, P2272, P2273
• DTC P2610
• DTC P2627, P2630
• DTC P2628, P2631
• DTC P2A00, P2A03
• DTC U0073, U0155
• DTC U0122
• DTC U0122
• MAP SENSOR REPLACEMENT
• A/F SENSOR REPLACEMENT
• SECONDARY HO2S REPLACEMENT
• DLC CIRCUIT TROUBLESHOOTING

More articles — Engine Performance