Pgm-Fi System — Acura RL II рестайлинг (2008-2012)

Scheme 1

Scheme 1: Component Location Index

Scheme 2

DTC P0101: MAF Sensor Circuit Range/ Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P1128, P1129, P2228, and/or P2229 are stored at the same time as DTC P0101, troubleshoot those DTCs first, then recheck for DTC P0101.

Check for poor connections or damage to these parts: PCV hose Intake air duct Air cleaner Purge (PCS) line Brake booster Brake booster hose Are the parts OK? YES -Go to step 2. NO -Repair or replace the damaged parts, then go to step 15 .
Check for damage or looseness at the air duct in the air cleaner. Is it OK? YES -Go to step 3. NO -Reconnect or replace the air duct in the air cleaner, then go to step 14 .
Check for a dirty air cleaner element. Is it dirty? YES -Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system) ), then go to step 14 . NO -Go to step 4.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Check the MAF SENSOR in the DATA LIST with the HDS. Is there about 0.2 gm/s or 0.5 V? YES -Go to step 7. NO -Go to step 13 .
Start the engine.
Vary the engine speed is between 2,000 rpm and 3,000 rpm.
Check the MAF SENSOR in the DATA LIST with the HDS. Does the reading change? YES -Go to step 10. NO -Go to step 13 .
Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS MAP SENSOR MAF SENSOR
Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 13. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 11 and recheck.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS MAP SENSOR MAF SENSOR
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0101 indicated? YES -Check for poor connections or loose terminals at the MAF sensor and the PCM, then go to step 1 . NO -Go to step 20.
Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAF sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 .

DTC P0102: MAF Sensor Circuit Low Voltage

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

Scheme 3

Scheme 3: DTC P0102: MAF Sensor Circuit Low Voltage

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Turn the ignition switch to ON III), and wait 2 seconds.
Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 gm/s, or 0.1 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/I AT sensor and the PCM.
Check the No. 20 IGN SOL (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 4. NO -Repair short in the wire between the MAF sensor or the PCM and the No. 20 IGN SOL (15 A) fuse. Also replace the No. 20 IGN SOL (15 A) fuse, then go to step 20 .
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground. Is there battery voltage? YES -Go to step 8. NO -Repair open in the wire between the No. 20 IGN SOL (15 A) fuse and the MAF sensor, then go to step 22 .
Turn the ignition switch to LOCK (0).
Measure the resistance between MAF sensor/IAT sensor 5P connector terminal No. 3 and body ground. Is there 190-210 kohms? YES -Go to step 15 . NO -Go to step 10.
Jump the SCS line with the HDS.
Disconnect PCM connector D (17P).
Check for continuity between PCM connector terminal D10 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (D17) and the MAF sensor, then go to step 22 . NO -Go to step 13.
Connect MAF sensor/I AT sensor 5P connector terminal No. 3 to body ground with a jumper wire.
Check for continuity between PCM connector terminal D10 and body ground. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the PCM (D17) and the MAF sensor, then go to step 22 .
Substitute a known-good MAF sensor/I AT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 2,000 rpm without load (in P or N).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES -Reinstall the original MAF sensor/IAT sensor, and go to step 28 . NO -Replace the original MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0103: MAF Sensor Circuit High Voltage

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

Scheme 8

Scheme 8: DTC P0103: MAF Sensor Circuit High Voltage

Scheme 9

Scheme 10

Turn the ignition switch to ON (II), and wait 2 seconds.
Check the MAF SENSOR in the DATA LIST with the HDS. Is about 202 gm/s, or 4.89 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the MAF sensor/IAT sensor 5P connector.
Disconnect PCM connector D(17P).
Connect MAF sensor/IAT sensor 5P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between PCM connector terminal D11 and body ground. Is there continuity? YES -Go to step 9. NO -Repair open in the wire between the PCM (D11) and the MAF sensor, then go to step 16 .
Reconnect PCM connector D(17P).
Connect MAF sensor/I AT sensor 5P connector terminals No. 3 and No. 4 with a jumper wire.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES -Go to step 21 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0107: MAP Sensor Circuit Low Voltage

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

Scheme 11

Scheme 11: DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 12

Scheme 13

Turn the ignition switch to ON (II).
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, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the MAP sensor 3P connector.
Turn the ignition switch to ON (II).
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.
Measure the 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.
Measure the voltage between PCM connector terminals C4 and C6. Is there about 5 V? YES -Repair open in the wire between the PCM (C6) and the MAP sensor, then go to step 15 . NO -Go to step 20 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector C (22P).
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 PCM (C5) and the MAP sensor, then go to step 15 . NO -Go to step 20 .
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0108: MAP Sensor Circuit High Voltage

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

Scheme 14

Scheme 14: DTC P0108: MAP Sensor Circuit High Voltage

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Turn the ignition switch to ON (II).
Check the MAP SENSOR in the DATA LIST with the HDS. Is 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the MAP sensor 3P connector.
Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
Turn the ignition switch to ON (II).
Check the MAP SENSOR in the DATA LIST with the HDS. Is 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 .
Remove the jumper wire from the MAP sensor 3P connector.
Measure the 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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector C (22P).
Connect MAP sensor 3P connector terminal No. 3 to body ground with a jumper wire.
Check for continuity between PCM connector terminal C4 and body ground. Is there continuity? YES -Go to step 26 . NO -Repair open in the wire between the PCM (C4) and the MAP sensor, then go to step 21 .
Turn the ignition switch to LOCK (0).
Connect PCM connector terminals C4 and C5 with a jumper wire.
Turn the ignition switch to ON (II).
Check the MAP SENSOR in the DATA LIST with the HDS. Is 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 PCM (C5) and the MAP sensor, then go to step 21 .
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0111: IAT Sensor Circuit Range/ Performance Problem

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

Check for poor connections or loose terminals at ECT sensors 1 and 2, and the MAF sensor/IAT sensor. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 15 .
Remove the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the IAT sensor to cool to ambient temperature.
Note the ambient temperature.
Connect the MAF sensor/IAT sensor to its 5P connector, but do not install the sensor onto the air cleaner.
Turn the ignition switch to ON (II).
Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
Compare the value of the IAT SENSOR to the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more? YES -Go to step 13 . NO -Go to step 9.
Disconnect the MAF sensor/IAT sensor from its 5P connector.
Using a heat gun, blow hot air on the MAF sensor/ IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
Connect the MAF sensor/IAT sensor to its 5P connector, but do not install the sensor onto the air cleaner.
Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 58°F (32°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the PCM. NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0111 indicated? YES -Check for poor connections or loose terminals at the IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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 (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 19

Scheme 19: DTC P0112: IAT Sensor Circuit Low Voltage

Turn the ignition switch to ON (II).
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, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the MAF sensor/IAT sensor and the PCM (A5), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0113: IAT Sensor Circuit High Voltage

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

Scheme 20

Scheme 20: DTC P0113: IAT Sensor Circuit High Voltage

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Turn the ignition switch to ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more Indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire.
Turn the ignition switch to ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 8. NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 17 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Connect MAF sensor/IAT sensor 5P connector terminal No. 1 to body ground with a jumper wire.
Check for continuity between PCM connector terminal E1 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the PCM (El) and the MAF sensor/IAT sensor, then go to step 20 .
Measure the voltage between PCM connector terminal A5 and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (A5) and the MAF sensor/IAT sensor, then go to step 20 . NO -Go to step 25 .
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0116: ECT Sensor 1 Circuit Range/ Performance Problem

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

Turn the ignition switch to ON (II).
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 176°F (80°C) or higher, or 0.78 V or less indicated? YES -Go to step 6 . NO -Go to step 3.
Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (P or N) until the radiator fan comes on, then let it idle.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11 .
Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
Turn the ignition switch to LOCK (0).
Open the hood, and let the engine cool for 3 hours.
Turn the ignition switch to ON (II).
Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11.
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0117: ECT Sensor 1 Circuit Low Voltage

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

Scheme 25

Scheme 25: DTC P0117: ECT Sensor 1 Circuit Low Voltage

Turn the ignition switch to ON (II).
Check ECT SENSOR 1 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, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 1 2P connector.
Turn the ignition switch to ON (II).
Check ECT SENSOR 1 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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector C (49P).
Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between ECT sensor 1 and the PCM (A14), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0118: ECT Sensor 1 Circuit High Voltage

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

Scheme 26

Scheme 26: DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Turn the ignition switch to ON (II).
Check ECT SENSOR 1 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, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 1 2P connector.
Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
Turn the ignition switch to ON (II).
Check ECT SENSOR 1 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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from ECT sensor 1 2P connector.
Turn the ignition switch to ON (II).
Measure the voltage between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 17 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector C (22P).
Connect ECT sensor 1 2P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between PCM connector terminal C12 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the PCM (C12)and ECT sensor 1, then go to step 20 .
Measure the voltage between PCM connector terminal A14 and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (A14) and ECT sensor 1, then go to step 20 . NO -Go to step 25 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

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

Start the engine, and let it idle 5 minutes or more.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 10°F(-12°C) or less, or 4.45 V or more indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ). NO -Go to step 3.
Turn the ignition switch to LOCK (0).
Allow the engine to cool to 104°F (40°C) or less.
Make sure the temperature difference between ECT SENSOR 1 and ECT SENSOR 2 is about 50°F (10°C) in the DATA LIST with the HDS.
Start the engine, and let it idle until ECT sensor 1 goes up to around 158°F (70°C). Does ECT sensor 2 also show about 158°F (70°C)? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Check the thermostat (see «FAN MOTOR TEST»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ). Is the thermostat OK? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 8. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ), then go to step 8.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Turn the ignition switch to LOCK (0).
Allow the engine to cool to 104°F (40°C) or less.
Make sure the temperature difference between ECT SENSOR 1 and ECT SENSOR 2 is about 50°F (10°C) in the DATA LIST with the HDS.
Start the engine, and let it idle until ECT sensor 1 goes up to around 158°F (70°C). Does the ECT sensor 2 also show about 158°F (70°C)? YES -Go to step 1 and recheck. NO -Troubleshooting is complete.

DTC P0128: Cooling System Malfunction

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Make sure the blower switch is OFF.
Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES -Go to step 5. NO -Wait until the FAN CTRL is off, then go to step 5.
Check the radiator fan operation. Does the radiator fan keep running? YES -Check the cooling system (see «COMPONENT LOCATION INDEX»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ). If the cooling system is OK, go to step 19 . NO -Go to step 6.
Let the engine cool until the coolant temperature is 104°F (40°C) or less.
Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Start the engine, and let it idle.
Let the engine idle until ECT SENSOR 1 goes up 49°F (27°C) or more from the recorded temperature.
Check ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the recorded value of ECT SENSOR 2 and the present value of ECT SENSOR 2. Did temperature rise 17°F (9.5°C) or more? YES -Test the thermostat (see «FAN MOTOR TEST»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ), then go to step 12. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0128 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. then go to step 1 . NO -Go to step 18.
Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 17, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 14 .
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0128 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . NO -Go to step 24.
Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 20 .

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

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D 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)
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, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D 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)
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0133 and/or P0153* Indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 14.
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. If any other Temporary DTCs or DTCs were indicated in step 13, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the 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 .

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

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

Scheme 31

Scheme 31: DTC P0134: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction; DTC P0154: Front A/F Sensor

Scheme 32

Scheme 33

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (in P or N) for at least 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Go to step 5. NO -Intermittent failure, the 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 PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 .
Reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . NO -Go to step 14.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting. 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 PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle without load (in P or N) for at least 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . NO -Go to step 26.
Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTC's troubleshooting. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 34

Scheme 34: DTC P0135: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction; DTC P0155: Front A/F Senso

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Go to step 5. NO -Intermittent failure, the 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 PCM.
Turn the ignition switch to LOCK (0).
Check these fuses: No. 19 OPTION (40 A) fuse in the under-hood fuse/relay box. No. 4 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 EVAP canister vent shut valve, the A/F sensor relay (LAF), and the fuses, then replace the blown fuse(s), and go to step 24 . NO -Go to step 7.
Disconnect the A/F sensor (Sensor 1) 6P connector.
At the sensor side, measure the resistance between A/F sensor (Sensor 1) 6P connector terminals No. 1 and No. 2. Is there 2.5- 2.9 ohms at room temperature? YES -Go to step 9. NO -Go to step 22 .
At the sensor side, check for continuity between each terminal of the A/F sensor (Sensor 1) 6P connector and body ground. Is there continuity? YES -Go to step 22 . NO -Go to step 10.
At the sensor side, check for continuity between A/F sensor (Sensor 1) 6P connector terminals No. 1 and No. 4, No. 1 and No. 5, No. 1, and No. 6 individually. Is there continuity? YES -Go to step 22 . NO -Go to step 11.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between PCM connector terminal A7 (A6)* and body ground. Is there continuity? YES -Repair short in the wire between the PCM (A7 (A6) *) and the A/F sensor (Sensor 1), then go to step 23 . NO -Go to step 14.
Connect A/F sensor (Sensor 1) 6P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between PCM connector terminal A7 (A6)* and body ground. Is there continuity? YES -Go to step 16. NO -Repair open in the wire between the PCM (A7 (A6) *) and the A/F sensor (Sensor 1), then go to step 23 .
Remove the A/F sensor relay (LAF) (A) from the under-dash fuse/relay box.
Connect A/F sensor (Sensor 1) 6P connector terminal No. 1 to body ground with a jumper wire.
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 .
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E4 and A/F sensor relay (LAF) 4P connector terminal No. 3. Is there continuity? YES -Go to step 21. NO -Repair open in the wire between the PCM (E4) and the A/F sensor relay (LAF), then go to step 23 .
Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/rl/ii-2008-2012/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay OK? YES -Go to step 29 . NO -Replace the A/F sensor relay (LAF), then go to step 23 .
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), the under-dash fuse/relay box, and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 27, go to the indicated DTC's troubleshooting. 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), the under-dash fuse/relay box, and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), the under-dash fuse/relay box, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 32.
Monitor the OBD STATUS for DTC P0135 and/or P0155* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 31, go to the indicated DTC's troubleshooting. 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), the under-dash fuse/relay box, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 44

Scheme 44: DTC P0137: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage; DTC P0157: Front Secondary HO

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
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, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the secondary HO2S (Sensor 2) 4P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (24P).
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 PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 15 . NO -Go to step 23 .
Turn the ignition switch to LOCK (0).
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed at 1,500-3,000 rpm Drive 1 minute or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 21, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the 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 .
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D Engine speed at 1,500-3,000 rpm Drive 1 minute or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . NO -Go to step 28.
Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 27, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 25 .

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

Scheme 45

Scheme 45: DTC P0138: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage; DTC P0158: Front Secondary H

Scheme 46

Scheme 47

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
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, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the secondary HO2S (Sensor 2) 4P connector.
Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
Turn the ignition switch to ON (II).
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 PCM (C12) and the secondary HO2S (Sensor 2), then go to step 21 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B9 (B18)* and body ground. Is there continuity? YES -Go to step 29 . NO -Repair open in the wire between the PCM (B9 (B18)*) and the secondary HO2S (Sensor 2), then go to step 21 .
Turn the ignition switch to LOCK (0).
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed at 1,500-3,000 rpm Drive 1 minute or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 27, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the 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 .
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed at 1,500-3,000 rpm Drive 1 minute or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . NO -Go to step 33 .
Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 33, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 31 .

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
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, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the 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.
Turn the ignition switch to LOCK (0).
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0139 and/or P0159* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 13, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the 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 .

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

Scheme 48

Scheme 48: DTC P0141: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction; DTC P0161: Front Secon

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES -Go to step 5. NO -Intermittent failure, the 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 PCM.
Turn the ignition switch to LOCK (0).
Check these fuses: No. 19 OPTION (40 A) fuse in under-hood fuse/ relay box. No. 4 A/F SENSOR (15 A) fuse in under-dash fuse/relay box. No. 23 IGP (7.5 A) fuse in under-dash fuse/relay box. Are any of the fuses blown? YES -Repair short in the wire between the A/F sensors, the EVAP canister vent shut valve, the A/F sensor relay (LAF), and the fuses, then replace the fuse(s), and go to step 22 . NO -Go to step 7.
Disconnect the secondary HO2S (Sensor 2) 4P connector.
At the secondary HO2S (Sensor 2) side, measure the 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 .
At the secondary HO2S (Sensor 2) side, 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.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between PCM connector terminal A9 (A8)* and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E9 (E8) *) and the secondary HO2S (Sensor 2), then go to step 22 . NO -Go to step 13.
Connect secondary HO2S (Sensor 2) 4P connector terminal No. 3 to body ground with a jumper wire.
Check for continuity between PCM connector terminal A9 (A8)* and body ground. Is there continuity? YES -Go to step 15. NO -Repair open in the wire between the PCM (A9 (A8)*) and the secondary HO2S (Sensor 2), then go to step 22 .
Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2008-2012/remont/exteriorinterior-trim/#interior-trim) ), then remove the A/F sensor relay (LAF) (A) from the under-dash fuse/relay box.
Connect secondary HO2S (Sensor 2) 4P connector terminal No. 4 to body ground with a jumper wire.
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 (Sensor 1) and the A/F sensor relay (LAF), then go to step 22 .
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E4 and A/F sensor relay (LAF) 4P connector terminal No. 3. Is there continuity? YES -Go to step 20. NO -Repair open in the wire between the PCM (E4) and the A/F sensor relay (LAF), then go to step 22 .
Test the A/F sensor relay (LAF) (see «POWER RELAY TEST»(/acura/rl/ii-2008-2012/remont/body-electrical/#relays__power-relay-test) ). Is the A/F sensor relay (LAF) OK? YES -Go to step 28 . NO -Replace the A/F sensor relay (LAF), then go to step 22 .
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the PCM, then go to step 1 . NO -Go to step 27.
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. If any other Temporary DTCs or DTCs were indicated in step 26, go to the indicated DTC's troubleshooting. 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 PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F sensor relay (LAF), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 31.
Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 30, go to the indicated DTC's troubleshooting. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Poor fuel quality can also cause DTC P0171 and/or P0174. 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.

P0101, P0102, P0103: Mass air flow (MAF) sensor P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor

P0133, P0153, P1172, P1174, P2195, P2197, P2237, P2238, P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, 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, P2270, P2271, P2272, P2273: 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

Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES -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/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 2. If the pressure is too low, check the fuel pump, the fuel pressure regulator, the fuel filter, and the fuel lines for restrictions, then go to step 6 .
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Check under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in P or N All electrical loads off
Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES -Repeat step 4. NO -Go to step 5.
While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 12.8- 15.6 gm/s? YES -Check the engine valve clearances, and adjust them if needed (see «VALVE CLEARANCE ADJUSTMENT»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ). If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 6. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 6.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D 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 LT FUEL TRIM stays within 0.8-1.21, there is no problem at this time.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0171, P0172, P0174, or P0175 indicated? YES -Go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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

Special Tools Required

Pressure gauge adapter 07NAJ-P07010A
A/T low pressure gauge w/panel 07406-0070301
A/T pressure hose 07406-0020201
A/T pressure hose, 2,210 mm 07MAJ-PY4011A
A/T pressure hose, adapter 07MAJ-PY40120
Oil pressure hose 07ZAJ-S5AA200

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). 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) (Because parts can sometimes fail without setting DTC's you should also do a physical inspection of the systems listed below.)

P0101, P0102, P0103: Mass air flow (MAF) 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 57

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (in P or N).
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 idling until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then recheck.
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.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
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 or NOT COMPLETED, go to step 6 and recheck.
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, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Check the fuel quality. Is the quality good? YES -Go to step 11. NO -Drain the tank, and fill it with known-good fuel, then go to step 23 .
Inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/rl/ii-2008-2012/remont/ignition-system/#ignition-system) ). If the spark plugs are fouled or worn, replace them.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
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 23 .
Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/rl/ii-2008-2012/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/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 23 . If the pressure is too low, check the fuel pump, the fuel feed lines, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 23 .
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Check u n de r these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in P or N All electrical loads off
Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES -Repeat step 17. NO -Go to step 18.
While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.1- 12.9 gm/s? YES -Go to step 19. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 23 .
Remove the rocker arm oil pressure switch (A), and attach the special tools as shown, then attach the rocker arm oil pressure switch to the pressure gauge adapter (B).
Reconnect the rocker arm oil pressure switch 2P connector.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on.
Check the oil pressure at engine speeds 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 -Go to step 23. NO -Inspect the VTEC system, then go to step 23 .
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0300 and any combination of DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM, then go to the DTC P0301, P0302, P0303, P0304, P0305, or P0306 troubleshooting (see «DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED; DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED; DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED; DTC P0305: NO. 5 CYLINDER MISFIRE DETECTED; DTC P0306: NO. 6 CYLINDER MISFIRE DETECTED»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-no-1-cylinder-misfire) ). NO -Go to step 30.
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. If any other Temporary DTCs or DTCs were indicated in step 29, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the 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 28 .

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

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

Scheme 58

Scheme 58: DTC P0301: No. 1 Cylinder Misfire Detected DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load for 2 minutes (in P or N).
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 idling until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
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.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
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 .
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, the system is OK at this time. Check the fuel and ignition system circuit connectors for loose wires or poor connections.
Turn the ignition switch to LOCK (0).
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Reconnect all connectors.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
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 -Intermittent failure due to poor contact at the ignition coil contactor (no misfire at this time). Make sure that the ignition coil connectors are secure.
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/rl/ii-2008-2012/remont/ignition-system/#ignition-system) ), then go to step 55 . NO -Go to step 15.
Turn the ignition switch to LOCK (0).
Exchange the spark plug from the problem cylinder with the one from another cylinder.
Reconnect all connectors.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
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 20. NO -Intermittent failure due to spark plug fouling (no misfire at this time).
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 55 . NO -Go to step 21.
Turn the ignition switch to LOCK (0).
Disconnect the ignition coil 3P connector from the problem cylinder.
Turn the ignition switch to ON (II).
Measure the voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 25. NO -Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 55 .
Turn the ignition switch to LOCK (0).
Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 27. NO -Repair open in the wire between the ignition coil and G101, then go to step 55 .
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between body ground and the appropriate PCM connector terminal (see table). WIRE COLOR REFERENCE CHART PROBLEM CYLINDER DTC 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 PCM and the ignition coil, then go to step 55 . NO -Go to step 30.
Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table). WIRE COLOR REFERENCE CHART 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
Check for continuity between body ground and the appropriate PCM connector terminal (see table). WIRE COLOR REFERENCE CHART PROBLEM CYLINDER DTC 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 32. NO -Repair open in the wire between the PCM and the ignition coil, then go to step 55 .
Turn the ignition switch to ON (II).
Measure the voltage between body ground and the appropriate PCM connector terminal (see table). WIRE COLOR REFERENCE CHART PROBLEM CYLINDER DTC 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 43 . NO -Go to step 34.
Turn the ignition switch to LOCK (0).
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the injector 2P connector from the problem cylinder.
Turn the ignition switch to ON (II).
Measure the voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 39. NO -Repair open in the wire between the injector and PGM-FI main relay 1 (Fl MAIN), then go to step 55 .
Turn the ignition switch to LOCK (0).
Check for continuity between body ground and the appropriate PCM connector terminal (see table). WIRE COLOR REFERENCE CHART PROBLEM CYLINDER DTC 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 PCM and the injector, then go to step 55 . NO -Go to step 41.
Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table). WIRE COLOR REFERENCE CHART 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
Check for continuity between body ground and the appropriate PCM connector terminal (see table). WIRE COLOR REFERENCE CHART PROBLEM CYLINDER DTC 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 43. NO -Repair open in the wire between the PCM and the injector, then go to step 55 .
Measure the resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES -Go to step 44. NO -Replace the injector (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 55 .
Exchange the injector from the problem cylinder with the one from another cylinder. Also check the injector fuel inlet screen for debris, and clean if needed.
Reconnect all connectors, and install the intake manifold (see «INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Turn the ignition switch to ON (II).
Clear the DTCs with the HDS.
Start the engine, and let it idle without load (in Park or neutral) for 2 minutes.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
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 51. NO -Intermittent failure due to poor contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was moved? YES -Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 55 . NO -Go to step 52.
Turn the ignition switch to LOCK (0).
Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head__engine-compression-inspection) ). Did the engine pass both tests? YES -Go to step 54. NO -Repair the engine, then go to step 55 .
Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ). Did the engine pass the test? YES -Go to step 63 . NO -Repair the VTEC rocker arm, then go to step 55.
Reconnect all connectors.
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 61, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the 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 60 .
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 65 . If the PCM was substituted, go to step 1 . NO -Go to step 67.
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 -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 66, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 65 . If the PCM was substituted, 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 65 .

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 (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 69

Scheme 69: DTC P0325: Knock Sensor Circuit Malfunction

Scheme 70

Scheme 71

Scheme 72

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the knock sensor subharness 1P connector.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B6 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (B6) and the knock sensor subharness, then go to step 19 . NO -Go to step 11.
Connect the knock sensor subharness 1P connector terminal to body ground with a jumper wire.
Check for continuity between PCM connector terminal B6 and body ground. Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the PCM (B6) and the knock sensor subharness, then go to step 19 .
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the knock sensor 1P connector.
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.
Check for an open in the knock sensor subharness. Is the harness OK? YES -Go to step 17. NO -Repair open in the knock sensor subharness, then go to step 19 .
Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Install the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the intake manifold (see «INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES -Check for poor connections or loose terminals at the knock sensor and the PCM, go to step 26 . NO -Go to step 25.
Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 23 .
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES -Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 28 . If the PCM was substituted, go to step 1 . NO -Go to step 30.
Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 29, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 28 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 28 .

DTC P0335: CKP Sensor A No Signal; DTC P0385: CKP Sensor B No Signal

Scheme 73

Scheme 73: DTC P0335: CKP Sensor A No Signal; DTC P0385: CKP Sensor B No Signal

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect CKP sensor A/B 6P connector (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Measure the 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 .
Measure the 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 .
Measure the 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 .
Measure the voltage between PCM connector terminal B17 (B1)* and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (B17 (B1)*) and CKP sensor A/B, then go to step 18 . NO -Go to step 12.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B17 (B1)* and body ground. Is there continuity? YES -Repair short in the wire between the PCM (B17(B1)*) and CKP sensor A/B, then go to step 18 . NO -Go to step 25 .
Turn the ignition switch to LOCK (0).
Replace CKP sensor A/B (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES -Check for poor connections or loose terminals at CKP sensor A/B and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES -Check for poor connections or loose terminals at CKP sensor A/B and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0339 and/or P0389* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the PCM.
Check for poor or loose connections at these connectors and terminals: CKP sensor A/B PCM Engine ground Body ground Are the connections OK? YES -Go to step 6. NO -Repair the connectors or terminals, then go to step 9 .
Check for damage to the CKP sensor A/B pulse plate on the timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ). Is there damage? YES -Replace CKP sensor A/B pulse plate/timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ), then go to step 9 . NO -Go to step 7.
Turn the ignition switch to LOCK (0).
Replace the CKP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Start the engine, and let it idle 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0339 and/or P0389* indicated? YES -Check for poor connections or loose terminals at CKP sensor A/B and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0340: CMP Sensor No Signal

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

Scheme 78

Scheme 78: DTC P0340: CMP Sensor No Signal

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the CMP sensor 3P connector.
Turn the ignition switch to ON (II).
Measure the 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 (Fl MAIN), then go to step 18.
Measure the 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 .
Measure the 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 .
Measure the voltage between PCM connector terminal B8 and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (B8) and the CMP sensor, then go to step 18 . NO -Go to step 12.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B8 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (B8) and the CMP sensor, then go to step 18 . NO -Go to step 26 .
Turn the ignition switch to LOCK (0).
Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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 (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0344 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
Check for poor or loose connections at these connectors and terminals: CMP sensor PCM Engine ground Body ground Are the connections OK? YES -Go to step 6. NO -Reconnect or repair the connectors or terminals, then go to step 9 .
Check for damage to the CMP sensor pulse projection on the front camshaft pulley (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ). Is there damage? YES -Replace the front camshaft pulley (see «CYLINDER HEAD REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ), then go to step 9 . NO -Go to step 7.
Turn the ignition switch to LOCK (0).
Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0344 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P050A: Cold Start Idle Air Control System Performance Problem

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

Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs other than P050A indicated? YES -Go to the indicated DTC's troubleshooting. NO -Go to step 3.
Check for poor connections or blockage at the intake air duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the intake air duct, then go to step 20 .
Check for damage at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 20 .
Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system) ), then go to step 20 . NO -Go to step 6.
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds or more.
Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 10. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step 6 .
Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 11. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 20 .
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm for at least 30 seconds.
While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.7- 12.9 gm/s? YES -Go to step 14. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 20 .
Turn the ignition switch to LOCK (0).
Allow the engine to cool to ambient temperature.
Note the ambient temperature.
Turn the ignition switch to ON (II).
Note the value of IAT SENSOR quickly in the DATA LIST with the HDS.
Compare the value of the IAT SENSOR and the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more? YES -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 20. NO -Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 20. If there is damage in the throttle bore, replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 20.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Start the engine, and let it idle for 10 seconds or more.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P050A indicated? YES -Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . NO -Go to step 26.
Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step 23 .

DTC P050B: Cold Start Ignition Timing Control System Performance Problem

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

Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs other than P050B indicated? YES -Go to the indicated DTC's troubleshooting. NO -Go to step 3.
Check for poor connections or blockage at the intake air duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the intake air duct, then go to step 25 .
Check for damage at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 25 .
Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system) ), then go to step 25 . NO -Go to step 6.
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds or more.
Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 10. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step 6 .
Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/rl/ii-2008-2012/remont/ignition-system/#ignition-system) ). Is the ignition timing OK? YES -Go to step 12 . NO -Go to step 11.
Check for damage at the CKP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ) and the CKP sensor pulser plate (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ). Is the CKP sensor and/or the CKP sensor pulser plate damaged? YES -Replace the CKP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ) and/or the CKP sensor pulser plate (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ), then go to step 6 . NO -Go to step 31 .
Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 13. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 25 .
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm for at least 30 seconds.
While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.1- 12.9 gm/s? YES -Go to step 16. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 .
Turn the ignition switch to LOCK (0).
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the sensors to cool to ambient temperature.
Note the ambient temperature.
Connect ECT sensor 1 and ECT sensor 2 to their 2P connectors, but do not install them.
Turn the ignition switch to ON (II).
Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C from the ambient temperature, then go to step 25. NO -Check and repair any problems with the following items. Repair or replace them if it is necessary, then go to step 25. If it is OK, go to step 32 . Engine compression and cylinder leakdown VTEC system Engine oil A/C system Power steering
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Start the engine, and let it idle for 10 seconds or more.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P050B indicated? YES -Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Go to step 31.
Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 30, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step 28 .
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F(50°) or less.
Start the engine, and let it idle for 10 seconds or more.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P050B indicated? YES -Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ), then go to step 34 . If the PCM was substituted, go to step 1 . NO -Go to step 37.
Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 36, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 34 . If the PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step 34 .

DTC P0562: Charging System Low Voltage

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0562 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the 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/rl/ii-2008-2012/remont/body-electrical/#battery) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0562 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0563: PCM Power Source Circuit Unexpected Voltage

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

Scheme 83

Scheme 83: DTC P0563: PCM Power Source Circuit Unexpected Voltage

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Wait 10 seconds.
Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 (Fl MAIN) and the No. 8 Fl ECU (PCM) (15 A) fuse in the under-hood fuse/ relay box and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Measure the voltage between PCM connector terminal E5 and body ground. Is there battery voltage? YES -Go to step 13 . NO -Go to step 11.
Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2008-2012/remont/exteriorinterior-trim/#interior-trim) ). Then remove PGM-FI main relay 1 (Fl MAIN) (A) from the under-dash fuse/relay box.
Check for continuity between PCM connector terminal E5 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E5) and PGM-FI main relay 1 (Fl MAIN), then go to step 20 . NO -Go to step 19 .
Reconnect PCM connector E (31P).
Measure the voltage between PCM connector terminal E5 and body ground. Is there battery voltage? YES -Go to step 15. NO -Go to step 27 .
Disconnect PCM connector A (31P).
Measure the voltage between PCM connector terminal A4 and body ground. Is there battery voltage? YES -Go to step 17. NO -Go to step 27 .
Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2008-2012/remont/exteriorinterior-trim/#interior-trim) ). Then remove PGM-FI main relay 1 (Fl MAIN) (A) from the under-dash fuse/relay box.
Measure the voltage between PCM connector terminal A4 and body ground. Is there battery voltage? YES -Repair short to power in the wire between the PCM (A4) and PGM-FI main relay 1 (Fl MAIN), then go to step 20 . NO -Go to step 19.
Replace PGM-FI main relay 1 (Fl MAIN) (A).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Turn the ignition switch to LOCK (0).
Wait for 10 seconds.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 (Fl MAIN) and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 (Fl MAIN) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0602: PCM Programming Error

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). This DTC is indicated when a PCM update is not completed. Do not turn the ignition switch to LOCK (0) or ACC (I) while updating the PCM. If you turn the ignition switch to LOCK (0) or ACC (I) before completion, the PCM can be damaged.

Do the PCM update procedure (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0602 indicated? YES -Replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -The update is complete.

DTC P0615: Starter Cut Relay STRLD Circuit Malfunction

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

Scheme 91

Scheme 91: DTC P0615: Starter Cut Relay STRLD Circuit Malfunction

Scheme 92

Scheme 93

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
Turn the ignition switch to LOCK (0).
Check the No. 32 STRLD (7.5 A) fuse in the auxiliary under-dash fuse/relay holder. Is the fuse OK? YES -Go to step 7. NO -Replace the No. 32 STRLD (7.5 A) fuse in the auxiliary under-dash fuse/relay holder, then go to step 12 .
Jump the SCS line with the HDS.
Disconnect PCM connector D(17P).
Remove starter cut relay 1 (A) from auxiliary under-dash fuse/relay holder.
Connect starter cut relay 1 4P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between PCM connector terminal D5 and body ground. Is there continuity? YES -Go to step 17 . NO -Repair open in the wire between the PCM (D5) and starter cut relay 1, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 and the PCM, then go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P062F: PCM Internal Control Module Keep Alive Memory (KAM) Error

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P062F indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0630: VIN Not Programmed or Mismatch

Turn the ignition switch to ON (II).
Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES -Go to step 5 . NO -Go to step 3.
Input the VIN to the PCM with the HDS. Does the screen show COMPLETE? YES -Go to step 5 . NO -Go to step 4.
Check for DTCs with the HDS. Is DTC P062F indicated? YES -Do the troubleshooting for P062F (see «DTC P062F: PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-p062f-pcm-internal-control-module) ). NO -Go to step 9 .
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and wait 5 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0630 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0630 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0685: PCM Power Control Circuit/ Internal Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the problem doesn't return after you clear the DTC, or if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the PCM.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0685 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0685 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 10 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1109: BARO Sensor Circuit Out of Range High

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

Reset the PCM with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1109 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1109 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1116: ECT Sensor 1 Circuit Range/ Performance Problem

Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 27 .
Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES -Go to step 15 . NO -Go to step 4.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 129°F (54°C) or less, or 1.54 V or more indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow ECT sensor 1 to cool to 77°F (25°C).
Note the ambient temperature.
Connect ECT sensor 1 to its 2P connector, but do not install it.
Turn the ignition switch to ON (II).
Note the value of ECT SENSOR 1 quickly in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 and the ambient temperature. Does the value of ECT SENSOR 1 differ 5.4°F (3°C) or more? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 118°F (48°C) or less, or 1.75 V or more indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 17.
Let the engine idle 10 minutes.
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 19.
Turn the ignition switch to LOCK (0).
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the sensors to cool to 77°F (25°C).
Note the ambient temperature.
Connect ECT sensor 1 and ECT sensor 2 to their 2P connectors, but do not install them.
Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 27. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1128: MAP Sensor Signal Lower Than Expected

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

Turn the ignition switch to ON (II).
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.
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm Transmission in D Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle
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, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm Transmission in D Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1128 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 15.
Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 14, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 12 .

DTC P1129: MAP Sensor Signal Higher than Expected

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

Check for vacuum leaks in these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Are there any vacuum leaks? YES -Repair or replace parts with vacuum leaks, then go to step 9 . NO -Go to step 2.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
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.
Clear the DTC with the HDS.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm Transmission in D Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at least 5 seconds
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, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 5 and recheck.
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400 and 6,500 rpm Transmission in D Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at least 5 seconds
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1129 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 15.
Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 14, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 12 .

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Monitor the OBD STATUS 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, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1172 and/or P1174* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 11, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.

DTC P1297: ELD Circuit Low Voltage

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

Scheme 94

Scheme 94: DTC P1297: ELD Circuit Low Voltage

Turn the ignition switch to ON (II).
Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the ELD 3P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E18 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E18) and the ELD, then go to step 13 . NO -Go to step 20 .
Turn the ignition switch to LOCK (0).
Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/body-electrical/#under-hood-fuserelay-box) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
Turn on the headlights.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD unit and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine.
Turn on the headlights.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD unit and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1298: ELD Circuit High Voltage

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

Scheme 95

Scheme 95: DTC P1298: ELD Circuit High Voltage

Scheme 96

Scheme 97

Scheme 98

Start the engine, and let it idle.
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, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the ELD 3P connector.
Turn the ignition switch to ON (II).
Measure the 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 in the driver's under-dash fuse/ relay box and the ELD, then go to step 14 .
Turn the ignition switch to LOCK (0).
Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E18 and body ground. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the PCM (E18) and the ELD, then go to step 14 .
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 G301, then go to step 14 .
Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/body-electrical/#under-hood-fuserelay-box) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1298 indicated? YES -Go to step 19. NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1298 indicated? YES -Check for poor connections or loose terminals at the ELD unit and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1549: Charging System High Voltage

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/C off Headlights off Rear window defogger off
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1549 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/C off Headlights off Rear window defogger off
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1549 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P16BB: Alternator B Terminal Circuit Low Voltage

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BB indicated? YES -Go to step 7. NO -Intermittent failure, the 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/rl/ii-2008-2012/remont/body-electrical/#battery) ).
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 -Repair the connectors or terminals, then go to step 9 .
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/rl/ii-2008-2012/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.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BB indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P16BC: Alternator FR Terminal Circuit/ IGP Circuit Low Voltage

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

Scheme 99

Scheme 99: DTC P16BC: Alternator FR Terminal Circuit/ IGP Circuit Low Voltage

Scheme 100

Scheme 101

Scheme 102

Check for poor connections at the alternator 4P connector. Are the connections OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 20 .
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES -Go to step 8. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator.
Turn the ignition switch to LOCK (0).
Disconnect the alternator 4P connector.
Turn the ignition switch to ON (II).
Measure the 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 the driver's under-dash fuse/relay box, then go to step 19 .
Measure the 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/rl/ii-2008-2012/remont/charging-system/#charging-system) ), then go to step 19 . NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between PCM connector terminal A12 and body ground. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the PCM (A12) and the alternator, then go to step 18.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or N) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine.
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
Hold the engine speed at 2,000 rpm (in P or IN) for 1 minute.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 29 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P16BD: Starter Relay 2 Malfunction

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS and wait 5 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BD indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter relay 2 and the PCM.
Replace starter relay 2.
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BD indicated? YES -Check for poor connections or loose terminals at starter relay 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P16BE: Starter Relay 1 Malfunction

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS and wait 5 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BE indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter relay 1 and the PCM.
Replace starter relay 1.
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter relay 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P16BF: Starter Relay STRLY Circuit Malfunction

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

Scheme 103

Scheme 103: DTC P16BF: Starter Relay STRLY Circuit Malfunction

Scheme 104

Turn the ignition switch to ON (II).
Clear the DTC with the HDS and wait 5 seconds.
Check for STARTER CUT RELAY in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 4. NO -Go to step 12 .
Turn the ignition switch to START (III).
While holding the ignition switch in START (III), check the STARTER CUT CONTROL RETURN in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
Turn the ignition switch to LOCK (0).
Remove starter cut relay 1 from the auxiliary under-dash fuse/relay box and starter cut relay 2 from the driver's under-dash fuse/relay box.
Test the starter cut relays (see «POWER RELAY TEST»(/acura/rl/ii-2008-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 9. NO -Replace starter cut relay 1 and/or starter cut relay 2, then go to step 19 .
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E21 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E21) and starter relay 1 or starter relay 2, then go to step 19 . NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Remove starter cut relay 1 from the auxiliary under-dash fuse/relay box and starter cut relay 2 from the driver's under-dash fuse/relay box.
Test the starter cut relays (see «POWER RELAY TEST»(/acura/rl/ii-2008-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 15. NO -Replace starter cut relay 1 and/or starter cut relay 2, then go to step 19 .
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminal E21 and body ground. Is there 1.0 V or more? YES -Repair short in the wire between the PCM (E21) and starter cut relay 1 or starter cut relay 2, then go to step 19. NO -Go to step 24 .
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter relay 1, starter relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter relay 1, starter relay 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substitute, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2183: ECT Sensor 2 Circuit Range/ Performance Problem

Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connectors or terminals, then go to step 27 .
Turn the ignition switch to ON (II).
Check for Temporary DTC s or DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES -Go to step 15 . NO -Go to step 4.
Start the engine, and let it idle 10 minutes.
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow ECT sensor 2 to cool to 77°F (25°C).
Note the ambient temperature.
Connect ECT sensor 2 to its 2P connector, but do not install it onto the engine.
Turn the ignition switch to ON (II).
Note the value of ECT SENSOR 2 quickly in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 2 and the outside temperature. Does ECT SENSOR 2 differ 5.4°F (3°C) or more? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 118°F (48°C) or less, or 1.75 V or more indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 17.
Let the engine idle 10 minutes.
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO -Go to step 19.
Turn the ignition switch to LOCK (0).
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the sensors to cool to ambient temperature.
Note the ambient temperature.
Connect ECT sensor 1 and ECT sensor 2 to their 2P connectors, but do not install them.
Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 27. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2183 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2184: ECT Sensor 2 Circuit Low Voltage

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

Scheme 105

Scheme 105: DTC P2184: ECT Sensor 2 Circuit Low Voltage

Turn the ignition switch to ON (II).
Check ECT SENSOR 2 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, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 2 2P connector.
Turn the ignition switch to ON (II).
Check ECT SENSOR 2 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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (24P).
Check for continuity between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between ECT sensor 2 and the PCM (B24), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2185: ECT Sensor 2 Circuit High Voltage

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

Scheme 106

Scheme 106: DTC P2185: ECT Sensor 2 Circuit High Voltage

Scheme 107

Scheme 108

Scheme 109

Scheme 110

Turn the ignition switch to ON (II).
Check ECT SENSOR 2 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, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect ECT sensor 2 2P connector.
Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
Turn the ignition switch to ON (II).
Check ECT SENSOR 2 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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from ECT sensor 2 2P connector.
Turn the ignition switch to ON (II).
Measure the voltage between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 17 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Connect ECT sensor 2 2P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between PCM connector terminal E1 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the PCM (E1) and ECT sensor 2, then go to step 20 .
Measure the voltage between PCM connector terminal B24 and body ground. Is there about 5 V? YES -Repair open in the wire between the PCM (B24) and ECT sensor 2, then go to step 20 . NO -Go to step 25 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). 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, P2138, 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)*.

Check for dirt or debris in the MAF sensor/IAT sensor. Is it dirty? YES -Remove the debris. If needed, replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ). NO -Go to step 2.
Check the installation of the A/F sensor (Sensor 1). Is the A/F sensor loose or disconnected from the exhaust pipe? YES -Go to step 7 . NO -Go to step 3.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 14 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Turn the ignition switch to LOCK (0).
Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 2 . NO -Go to step 12.
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. If any other Temporary DTCs or DTCs were indicated in step 11, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 2 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 15 . If the PCM was substituted, go to step 2 . NO -Go to step 16.
Monitor the OBD STATUS for DTC P2195 and/or P2197* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 15, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 15 . If the PCM was substituted, go to step 2 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2227: BARO Sensor Circuit Range/ Performance Problem

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

Turn the ignition switch to ON (II), and wait 2 seconds.
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 -Go to step 8 .
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Throttle position between 14 deg and 45 deg for at least 2 seconds
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, the system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
Check the intake air system for clogging or the restrictions (foreign material, dirty air cleaner element, etc). Is the intake air system clogged or restricted? YES -Remove the clog or restriction, then go to step 9 . NO -Go to step 8.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Throttle position between 14 deg and 45 deg for at least 2 seconds
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2227 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 9 . If the PCM was substituted, go to step 1 . NO -Go to step 12.
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 11, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 9 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 9 .

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 (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
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, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2228 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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 (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
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, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2229 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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

Scheme 111

Scheme 111: DTC P2237: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage; DTC P2240: Front A/F Sensor (

Scheme 112

Scheme 113

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 6P connector terminal No. 5 to body ground with a jumper wire.
Check for continuity between PCM connector terminal B14(B22)* and body ground. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (B14 (B22)*) and the A/F sensor (Sensor 1), then go to step 16 .
Remove the jumper wire from the A/F sensor (Sensor 1) 6P connector, then reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminals B14 (B22)* and C12. Is there about 0.2 V or less? YES -Go to step 22 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 26.
Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 114

Scheme 114: DTC P2238: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit Low Voltage; DTC P2241: Front A/F Sensor (B

Scheme 115

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminals B14 (B22)* and C12. Is there continuity? YES -Repair short in the wire between the PCM (B14 (B22)* and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
Reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 rpm without load (inP or N) until the radiator fan comes on, then let it idle for 2 minutes.
Measure the voltage between PCM connector terminals B14 (B22)* and C12. Is there about 0.2 V or less? YES -Go to step 21 . NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 25.
Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 116

Scheme 116: DTC P2243: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage; DTC P2247: Front A/F Senso

Scheme 117

Scheme 118

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 6P connector terminal No. 6 to body ground with a jumper wire.
Check for continuity between PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 16 .
Remove the jumper wire from the A/F sensor (Sensor 1) 6P connector, then reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminals B13 (B21)* and C12. Is there about 0.2 V or less? YES -Go to step 22 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 26.
Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 119

Scheme 119: DTC P2245: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage; DTC P2249: Front A/F Sensor

Scheme 120

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B13 (B21)* and body ground. Is there continuity? YES -Repair short in the wire between the PCM (B13 (B21)*) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
Reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminals B13 (B21)* and C12. Is there about 0.2 V or less? YES -Go to step 21 . NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* Indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 25.
Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 121

Scheme 121: DTC P2251: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage; DTC P2254: Front A/F Sensor (

Scheme 122

Scheme 123

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 16 .
Remove the jumper wire from the A/F sensor (Sensor 1) 6P connector, then reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminals B12 (B20)* and C12. Is there about 0.2 V or less? YES -Go to step 22 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. If DTC P2251 and/or P2254* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 26.
Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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

Scheme 124

Scheme 124: DTC P2252: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage; DTC P2255: Front A/F Sensor (B

Scheme 125

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 6P connector.
Disconnect PCM connector B (24P).
Check for continuity between PCM connector terminal B12 (B20)* and body ground. Is there continuity? YES -Repair short in the wire between the PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
Reconnect PCM connector B (24P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminals B12 (B20)* and C12. Is there about 0.2 V or less? YES -Go to step 21 . NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 25.
Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2610: PCM Internal Power Off Timer Malfunction

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2610 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2610 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed at 25-55 mph (40-88 km/h) for 5 minutes Drive at a steady speed of 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with full throttle closed) for 6 seconds.
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, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed at 25-55 mph (40-88 km/h) for 5 minutes Drive at a steady speed of 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with full throttle closed) for 6 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2A00 and/or P2A03* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 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. If any other Temporary DTCs or DTCs were indicated in step 12, go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the 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 .

DTC U0073: F-CAN Malfunction (BUS-OFF)

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC U0114: F-CAN Malfunction (PCM-SH-AWD Control Unit)

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

Scheme 126

Scheme 126: DTC U0114: F-CAN Malfunction (PCM-SH-AWD Control Unit)

Scheme 127

Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are DTC U0073 and U0114 indicated at the same time? YES -Go to «DTC U0073: F-CAN Malfunction (BUS-OFF)»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-u0073-f-can-malfunction-bus-off) . NO -Go to step 3.
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0114 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the SH-AWD control unit and the PCM.
Check for communication to the SH-AWD system with the HDS. Does the HDS communicate with the SH-AWD control unit? YES -Go to step 6. NO -Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect SH-AWD control unit connector A (26P).
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E15 and SH-AWD control unit connector A (26P) terminal No. 11. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (E15) and the SH-AWD control unit, then go to step 12.
Check for continuity between PCM connector terminal E26 and SH-AWD control unit connector A (26P) terminal No. 10. Is there continuity? YES -Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 12 and recheck. If DTC U0114 is not indicated, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 12. NO -Repair open in the wire between the PCM (E26) and the SH-AWD control unit, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0114 indicated? YES -Check for poor connections or loose terminals at the gauge control module, the SH-AWD control unit, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)

Scheme 128

Scheme 128: DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)

Turn the ignition switch to ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are DTC U0073 and U0114 indicated at the same time? YES -Go to «DTC U0073: F-CAN Malfunction (BUS-OFF)»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-u0073-f-can-malfunction-bus-off) . NO -Go to step 3.
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the SH-AWD control unit and the PCM.
Check for communication to the VSA system with the HDS. Does the HDS communicate with the VSA modulator-control unit? YES -Go to step 6. NO -Go to «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect VSA modulator-control unit 47P connector.
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E15 and VSA modulator-control unit 47P connector terminal No. 14. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (E15) and the VSA modulator-control unit, then go to step 12.
Check for continuity between PCM connector terminal E26 and VSA modulator-control unit 47P connector terminal No. 30. Is there continuity? YES -Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12. NO -Repair open in the wire between the PCM (E26) and the VSA modulator-control unit, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES -Check for poor connections or loose terminals at the gauge control module, the SH-AWD control unit, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)

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

Scheme 129

Scheme 129: DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)

Scheme 130

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the SH-AWD control unit and the PCM.
Check for body electrical DTCs in the DTCs MENU with the HDS. Is DTC B1168, B1169 and/or B1178 indicated? YES -Go to step 5. NO -Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rl/ii-2008-2012/remont/communication-devices/#multiplex-integrated-control-system__gauge-control-module-input-test) ).
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Remove the gauge control module ( «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), and disconnect the gauge control module connector B (28P).
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E15 and gauge control module connector B (28P) terminal No. 16. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the PCM (E15) and the gauge control unit, then go to step 11.
Check for continuity between PCM connector terminal E26 and gauge control module connector B (28P) terminal No. 15. Is there continuity? YES -Substitute a known-good gauge control unit (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step 11 and recheck. If DTC U0155 is not indicated, replace the original gauge control unit (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step 11. NO -Repair open in the wire between the PCM (E26) and the gauge control unit, then go to step 11.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0155 indicated? YES -Check for poor connections or loose terminals at the gauge control module, the gauge control unit, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

Scheme 131

Scheme 131: F-CAN Circuit Troubleshooting

Scheme 132

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Scheme 158

Scheme 159

Scheme 160

Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 85-103 ohms? YES -Go to step 52 . NO -Go to step 5.
Disconnect these connectors: Gauge control module connector B (28P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). E-pretensioner unit connector B (14P) (if equipped) (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ). ACC (Adaptive Cruise Control) unit 20P connector (if equipped) (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ). Steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). TPMS control unit connector B (20P) (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). Navigation unit connector B (32P) (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/navigation-system/#navigation-system__navigation-unit-removalinstallation) ). AcuraLink control unit (XM receiver) connector A (32P) (if equipped) (see «STEREO AMPLIFIER REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/entertainment-systems/#audio-system) ). SH-AWD control unit connector A (26P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Check for continuity between PCM connector terminals E15 and E26. Is there continuity? YES -Repair short in the wire between PCM connector terminals E15 and E26. NO -Go to step 7.
Check for continuity between PCM connector terminal E15 and gauge control module connector B (28P) terminal No. 16. Is there continuity? YES -Go to step 8. NO -Repair open in the wire between the PCM (E15) and the gauge control module.
Check for continuity between PCM connector terminal E15 and VSA modulator-control unit 47P connector terminal No. 14. Is there continuity? YES -Go to step 9. NO -Repair open in the wire between the PCM (E15) and the VSA modulator-control unit.
Check for continuity between PCM connector terminal E15 and SH-AWD control unit connector A (26P) terminal No. 11. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the PCM (E15) and the SH-AWD control unit.
Check for continuity between PCM connector terminal E15 and steering angle sensor 5P connector terminal No. 4. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the PCM (E15) and the steering angle sensor.
Check for continuity between PCM connector terminal E15 and TPMS control unit connector B (20P) terminal No. 19. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the PCM (E15) and TPMS control unit.
Check for continuity between PCM connector terminal E15 and navigation unit connector B (32P) terminal No. 8. Is there continuity? YES - With ACC (adaptive cruise control): Go to step 13. With AcuraLink, without ACC: Go to step 15 . Without ACC, without AcuraLink: Go to step 16 . NO -Repair open in the wire between the PCM (E15) and the navigation unit.
Check for continuity between PCM connector terminal E15 and ACC unit 20P connector terminal No. 10. Is there continuity? YES -Go to step 14. NO -Repair open in the wire between the PCM (E15) and the ACC unit.
Check for continuity between PCM connector terminal E15 and e-pretensioner unit connector B (14P) terminal No. 3. Is there continuity? YES - With AcuraLink: Go to step 15. Without AcuraLink: Go to step 16. NO -Repair open in the wire between the PCM (E15) and the e-pretensioner unit.
Check for continuity between PCM connector terminal E15 and AcuraLink control unit (XM receiver) connector A (32P) terminal No. 7. Is there continuity? YES -Go to step 16. NO -Repair open in the wire between the PCM (E15) and the AcuraLink control unit (XM receiver).
Check for continuity between PCM connector terminal E26 and gauge control module connector B (28P) terminal No. 15. Is there continuity? YES -Go to step 17. NO -Repair open in the wire between the PCM (E26) and the gauge control module.
Check for continuity between PCM connector terminal E26 and VSA modulator-control unit 47P connector terminal No. 30. Is there continuity? YES -Go to step 18. NO -Repair open in the wire between the PCM (E26) and the VSA modulator-control unit.
Check for continuity between PCM connector terminal E26 and SH-AWD control unit connector A (26P) terminal No. 10. Is there continuity? YES -Go to step 19. NO -Repair open in the wire between the PCM (E26) and the SH-AWD control unit.
Check for continuity between PCM connector terminal E26 and steering angle sensor 5P connector terminal No. 2. Is there continuity? YES -Go to step 20. NO -Repair open in the wire between the PCM (E26) and the steering angle sensor.
Check for continuity between PCM connector terminal E26 and TPMS control unit connector B (20P) terminal No. 10. Is there continuity? YES -Go to step 21. NO -Repair open in the wire between the PCM (E26) and the TPMS control unit.
Check for continuity between PCM connector terminal E26 and navigation unit connector B (32P) terminal No. 24. Is there continuity? YES - With ACC (adaptive cruise control): Go to step 22. With AcuraLink, without ACC: Go to step 24 . Without ACC, without AcuraLink: Go to step 25 . NO -Repair open in the wire between the PCM (E26) and the navigation unit.
Check for continuity between PCM connector terminal E26 and ACC unit 20P connector terminal No. 20. Is there continuity? YES -Go to step 23. NO -Repair open in the wire between the PCM (E26) and the ACC unit.
Check for continuity between PCM connector terminal E26 and e-pretensioner unit connector B (14P) terminal No. 5. Is there continuity? YES - With AcuraLink: Go to step 24. Without AcuraLink: Go to step 25. NO -Repair open in the wire between the PCM (E26) and the e-pretensioner unit.
Check for continuity between PCM connector terminal E26 and AcuraLink control unit (XM receiver) connector A (32P) terminal No. 6. Is there continuity? YES -Go to step 25. NO -Repair open in the wire between the PCM (E26) and the AcuraLink control unit (XM receiver).
Remove the jumper wire from the PCM connector.
Reconnect gauge control module connector B (28P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES -Go to step 28. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
Disconnect gauge control module connector B (28P).
Reconnect the VSA modulator-control unit 47P connector.
Measure the resistance between PCM connector terminals E15 and E26. Is there about 108-132ohms? YES -Go to step 31. NO -Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
Disconnect the VSA modulator-control unit 47P connector.
Reconnect SH-AWD control unit connector A (26P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34- 2.86 kohms? YES -Go to step 34. NO -Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Disconnect SH-AWD control unit connector A (26P).
Reconnect the steering angle sensor 5P connector.
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES -Go to step 37. NO -Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
Disconnect the steering angle sensor 5P connector.
Reconnect TPMS control unit connector B (20P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES -Go to step 40. NO -Substitute a known-good TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
Disconnect TPMS control unit connector B (20P).
Reconnect navigation unit connector B (32P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES - With ACC system: Go to step 43. With AcuraLink control system, without ACC system: Go to step 49 . Without ACC system and AcuraLink control system: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good navigation unit (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/navigation-system/#navigation-system__navigation-unit-removalinstallation) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original navigation unit (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/navigation-system/#navigation-system__navigation-unit-removalinstallation) ).
Disconnect navigation unit connector B (32P).
Reconnect ACC unit 20P connector.
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES -Go to step 46. NO -Substitute a known-good ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ).
Disconnect ACC unit 20P connector.
Reconnect e-pretensioner unit connector B (14P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES - With AcuraLink control system: Go to step 49. Without AcuraLink control system: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good e-pretensioner unit (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original e-pretensioner unit (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ).
Disconnect e-pretensioner unit connector B (14P).
Reconnect AcuraLink control unit(XM receiver) connector A (32P).
Measure the resistance between PCM connector terminals E15 and E26. Is there about 2.34-2.86 kohms? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good AcuraLink control unit (XM receiver) (see «STEREO AMPLIFIER REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/entertainment-systems/#audio-system) ), and reconnect PCM connector E. If the HDS identifies the vehicle, replace the original AcuraLink control unit (XM receiver) (see «STEREO AMPLIFIER REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/entertainment-systems/#audio-system) ).
Disconnect these connectors: Gauge control module connector B (28P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). E-pretensioner unit connector B (14P) (if equipped) (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ). ACC unit 20P connector (if equipped) (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ). Steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). TPMS control unit connector B (20P) (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). Navigation unit connector B (32P) (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/navigation-system/#navigation-system__navigation-unit-removalinstallation) ). AcuraLink control unit(XM receiver) connector A (32P) (if equipped) (see «STEREO AMPLIFIER REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/entertainment-systems/#audio-system) ). SH-AWD control unit connector A (26P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Check for continuity between PCM connector terminal E15 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E15) and the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the ACC unit, the e-pretensioner unit, the AcuraLink control unit (XM receiver), the steering angle sensor, the TPMS control unit, the navigation unit, or the DLC. NO -Go to step 57.
Check for continuity between PCM connector terminal E26 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E26) and the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the ACC unit, the e-pretensioner unit, the AcuraLink control unit (XM receiver), the steering angle sensor, the TPMS control unit, the navigation unit, or the DLC. NO -Go to step 55.
Reconnect all connectors.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Disconnect gauge control module connector B (28P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO -Go to step 59.
Turn the ignition switch to LOCK (0).
Reconnect gauge control module connector B (28P).
Disconnect the VSA modulator-control unit 47P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the VSA control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 66.
Turn the ignition switch to LOCK (0).
Reconnect the VSA modulator-control unit 47P connector.
Disconnect SH-AWD control unit connector A (26P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the SH-AWD control unit (see «SYMPTOM TROUBLESHOOTING INDEX»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential__symptom-troubleshooting-index) ). NO -Go to step 67.
Turn the ignition switch to LOCK (0).
Reconnect SH-AWD control unit connector A (26P).
Disconnect the steering angle sensor 5P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). NO -Go to step 71.
Turn the ignition switch to LOCK (0).
Reconnect the steering angle sensor 5P connector.
Disconnect TPMS control unit connector B (20P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). NO -Go to step 75.
Turn the ignition switch to LOCK (0).
Reconnect TPMS control unit connector B (20P).
Disconnect navigation unit connector B (32P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the navigation unit (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/navigation-system/#navigation-system__navigation-unit-removalinstallation) ). NO - With ACC system: Go to step 79. With AcuraLink control system, without ACC system: Go to step 83 . Without ACC system and AcuraLink control system: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
Turn the ignition switch to LOCK (0).
Reconnect navigation unit connector B (32P).
Disconnect ACC unit 20P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ). NO -Go to step 83.
Turn the ignition switch to LOCK (0).
Reconnect ACC unit 20P connector.
Disconnect e-pretensioner unit connector B (14P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the e-pretensioner unit (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ). NO - With AcuraLink control system: Go to step 87. Without AcuraLink control system: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
Turn the ignition switch to LOCK (0).
Reconnect e-pretensioner unit connector B (14P).
Disconnect AcuraLink control unit (XM receiver) connector A (32P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the AcuraLink control unit (XM receiver) (see «STEREO AMPLIFIER REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/entertainment-systems/#audio-system) ). NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the HDS identifies the vehicle with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

Scheme 161

Scheme 161: MIL Circuit Troubleshooting

Turn the ignition switch to ON (II).
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__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 symptom/indication goes away with a known-good gauge control module, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES -Go to step 5. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
Turn the ignition switch to LOCK (0).
Disconnect PCM connector E (31P), then disconnect the HDS.
Check for continuity between PCM connector terminal E16 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (E16)and the DLC. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

DLC Circuit Troubleshooting

Note. Make sure the HDS and the DLC cable of the HDS are not defective.

Scheme 162

Scheme 162: DLC Circuit Troubleshooting

Scheme 163

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Scheme 168

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Scheme 182

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Scheme 184

Scheme 185

Turn the ignition switch to LOCK (0).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). NOTE: Make sure the HDS is properly connected to the DLC.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Go to step 4. NO -Go to step 25 .
Check for Temporary DTCs or DTCs in the PGM-FI system with the HDS. Are any Temporary DTCs or DTCs indicated? YES -Go to the indicated DTC's troubleshooting. NO - If the HDS does not communicate with the SRS system, go to step 5. If the HDS does not communicate with the VSA system, go to step 7 . If the HDS does not communicate with the TPMS, go to step 9 . If the HDS does not communicate with the SH-AWD system, go to step 11 . If the HDS does not communicate with the ACC system, go to step 13 . If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 15 . If the HDS does not communicate with the BODY ELECTRICAL system, go to step 17 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the SRS indicator. Does the SRS indicator stay on? YES -Go to the SRS system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/airbag/#srs-supplemental-restraint-system) ). NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the VSA indicator. Does the VSA indicator stay on? YES -Go to the VSA system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the TPMS indicator. Does the TPMS indicator stay on? YES -Go to the TPMS general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system) ). NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the SH-AWD indicator. Does the SH-AWD indicator stay on? YES -Go to the SH-AWD general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/differentials-drive-axles/#rear-differential) ). NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the ACC indicator. Does the ACC indicator stay on? YES -Go to the ACC general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/cruise-control-systems/#adaptive-cruise-control-acc-system) ). NO -Go to step 19 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES -Go to the immobilizer system's troubleshooting (see «SYSTEM DESCRIPTION»(/acura/rl/ii-2008-2012/remont/door-locks-anti-theft-systems/#immobilizer-system__system-description) ). NO -Go to step 19 .
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ).
Check the gauge display. Is Error 2 indicated? YES -Check for B-CAN system DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/communication-devices/#multiplex-integrated-control-system) ). NO -Go to step 19.
Turn the ignition switch to LOCK (0).
Disconnect the HDS from the DLC.
Check for continuity between body ground and DLC terminals No. 1 and No. 7 individually. Is there continuity? YES -Go to step 22. NO -Go to step 23 .
Continue to check for continuity between body ground and DLC terminals No. 1 and No. 7 individually, while disconnecting these connectors, one at a time: SRS unit connector A (28P) VSA modulator-control unit 47P connector TPMS control unit connector B (20P) Immobilizer-keyless control unit 7P connector SH-AWD control unit connector A (26P) ACC unit 20P connector Driver's under-dash fuse/relay box (P) (30P) connector Keyless access control unit connector A (31P) Does continuity go away when one of the above connectors is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair short in the wire between the DLC No. 7 (K-line) and the VSA modulator-control unit, the SRS unit, the TPMS control unit, the immobilizer-keyless control unit, the SH-AWD control unit, the ACC unit, and the driver's under-dash fuse/relay box, or between the DLC No. 1 (DIAG-H line), and the immobilizer control unit or the keyless access control unit.
Connect DLC terminals No. 1 and No. 7 to body ground with a jumper wire.
Check for continuity between body ground and these connector terminals: TERMINAL CONNECTOR REFERENCE CHART Connector Terminal SRS unit A (28P) No. 24 (RED) VSA modulator-control unit 47 P No. 11 (RED) TPMS control unit B (20P) No. 9 (RED) Immobilizer-keyless control unit 7P No. 3 (GRY) SH-AWD control unit A (26P) No. 15 (LT BLU) ACC unit 20P No. 8(BLU) Driver's under-dash fuse/ relay box (P) (30P) No. 6 (RED) Keyless access control unit A (31P) No. 6 (GRY) Is there continuity between the DLC terminal and each of the terminals in the chart? YES -Replace the part that does not communicate with the HDS. NO -Repair open in the wire between the DLC (K-line and DIAG-H line) and the appropriate connector.
Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/communication-devices/#multiplex-integrated-control-system) ). Is DTC B1168, B1169, and/or B1178 indicated? YES -Go to step 39 . NO -Go to step 26.
Turn the ignition switch to LOCK (0).
Disconnect the HDS from the DLC.
Measure the voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES -Go to step 29. NO -Repair open in the wire between DLC terminal No. 16 and the No. 7 BACK UP (10 A) fuse in the under-dash fuse/relay box.
Measure the voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES -Go to step 30. NO -Repair open in the wire between DLC terminal No. 4 and body ground (G501) (see «DASHBOARD WIRE HARNESS (LEFT BRANCH)»(/acura/rl/ii-2008-2012/remont/body-electrical/#connectors-and-harnesses__dashboard-wire-harness-left-branch) ).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Disconnect the HDS from the DLC.
Connect DLC terminal No. 6 to body ground with a jumper wire.
Check for continuity between PCM connector terminal E15 and body ground. Is there continuity? YES -Go to step 36. NO -Repair open in the wire between the PCM (E15) and DLC terminal No. 6.
Connect DLC terminal No. 14 to body ground with a jumper wire.
Check for continuity between PCM connector terminal E26 and body ground. Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair open in the wire between the PCM (E26) and DLC terminal No. 14.
Try to start the engine. Does the engine start and idle smoothly? YES -Go to F-CAN circuit troubleshooting (see «F-CAN CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system) ). NO -Go to step 39.
Turn the ignition switch to LOCK (0).
Check 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 41. NO -Repair short in the wire between the No. 23 +B IG MAIN (50 A) fuse and the ignition switch. Also replace the No. 23 +B IG MAIN (50 A) fuse.
Inspect the No. 23 IGP (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 47 . NO -Go to step 42.
Remove the blown No. 23 IGP (7.5 A) fuse from the driver's under-dash fuse/relay box.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between PCM connector terminal A4 and body ground. Is there continuity? YES -Go to step 46. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 23 IGP (7.5 A) fuse in the driver's under-hood fuse/relay box.
Disconnect each of the components or connectors below, one at a time, and check for continuity between PCM connector terminal A4 and body ground. Each injector 2P connector Camshaft position (CMP) sensor 3P connector Crankshaft position (CKP) sensor A/B 6P connector Driver's under-dash fuse/relay box 39P connector 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 PCM, update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 23 IGP (7.5 A) fuse. NO -Repair short in the wire between the PCM (A4) and the injector, the CMP sensor, the CKP sensor, or the driver's under-dash fuse/relay box. Also replace the No. 23 IGP (7.5 A) fuse in the driver's under-hood fuse/relay box.
Inspect the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 57 . NO -Go to step 48.
Remove the blown No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box.
Remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
Test PGM-FI main relay 2 (FUEL PUMP). Is relay is OK? YES -Go to step 51. NO -Replace PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 FUEL PUMP (20 A) fuse.
Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 1 and body ground. Is there continuity? YES -Go to step 52. NO -Go to step 55 .
Jump the SCS line with the HDS.
Disconnect PCM connector D (17P).
Check for continuity between PCM connector terminal D6 and body ground. Is there continuity? YES -Repair short in the wire between the No. 19 FUEL PUMP (20 A) fuse and the PCM (D6), between the No. 19 FUEL PUMP (20 A) fuse and PGM-FI main relay 2. Also replace the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box. NO -Replace the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box, and update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
Disconnect the fuel pump control module 10P connector (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system) ).
Check for continuity between the fuel pump control module 10P connector terminal No. 3 and body ground. Is there continuity? YES -Repair short in the wire between the fuel pump control module and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 19 FUEL PUMP (20 A) fuse. NO -Check the fuel pump control module, and replace it if necessary (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system) ). Also replace the No. 19 FUEL PUMP (20 A) fuse.
Jump the SCS line with the HDS.
Disconnect PCM connectors D (17P) and E (31P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector terminal D6 and body ground. Is there battery voltage? YES -Go to step 61. NO -Repair open in the wire between the No. 19 FUEL PUMP (20 A) fuse and the PCM (D6).
Measure the voltage between PCM connector terminal E5 and body ground. Is there battery voltage? YES -Go to step 68 . NO -Go to step 62.
Turn the ignition switch to LOCK (0).
Disconnect the driver's under-dash fuse/relay box 39P connector.
Check for continuity between PCM connector terminal E5 and driver's under-dash fuse/relay box 39P connector terminal No. 1. Is there continuity? YES -Go to step 65. NO -Repair open in the wire between the PCM (E5) and the driver's under-dash fuse/relay box.
Reconnect the driver's under-dash fuse/relay box connector X (39P).
Remove PGM-FI main relay 1 (F1 MAIN) (A) from the driver's under-dash fuse/relay box connector X (39P).
Check for continuity between PGM-FI main relay 1 (F1 MAIN) 4P connector terminal No. 3 and driver's under-dash fuse/relay box 39P connector terminal No. 1. Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Replace the driver's under-dash fuse/relay box.
Turn the ignition switch to LOCK (0).
Disconnect the driver's under-dash fuse/relay box 39P connector.
Check for continuity between PCM connector terminal A4 and driver's under-dash fuse/relay box 39P connector terminal No. 31. Is there continuity? YES -Go to step 68. NO -Repair open in the wire between the PCM (A4) and the driver's under-dash fuse/relay box.
Test PGM-FI main relay 1 in the driver's under-dash fuse/relay box (see «POWER RELAY TEST»(/acura/rl/ii-2008-2012/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 69. NO -Replace PGM-FI main relay 1.
Disconnect PCM connector B (24P).
Check for continuity between body ground and PCM connector terminals A1, A2, A3, and B15 individually. Is there continuity? YES -Go to step 71. NO -Repair open in the wire between the PCM (A1, A2, A3, B15) and G101.
Disconnect PCM connector C (22P).
Check for continuity between PCM connector terminal C6 and body ground. Is there continuity? YES -Go to step 73. NO -Go to step 77 .
Continue to check for continuity between PCM connector terminal C6 and body ground, while disconnecting these parts, one at a time: MAP sensor 3P connector Output shaft (countershaft) speed sensor 3P connector Does continuity go away when one of the above components is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair short in the wire between the PCM (C6) and the MAP sensor, the output shaft (countershaft) speed sensor.
Check for continuity between PCM connector terminal C14 and body ground. Is there continuity? YES -Go to step 75. NO -Go to step 79 .
Continue to check for continuity between PCM connector terminal C14 and body ground, while disconnecting these parts, one at a time: EGR valve 5P connector Input shaft (mainshaft) speed sensor 3P connector IMT actuator 5P connector Does continuity go away when one of the above components is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair short in the wire between the PCM (C14) and the EGR valve, the input shaft (mainshaft) speed sensor, or the IMT actuator.
Check for continuity between PCM connector terminal D2 and body ground. Is there continuity? YES -Go to step 77. NO -Go to step 79 .
Continue to check for continuity between PCM connector terminal D2 and body ground, while disconnecting the APP sensor 6P connector. Is there continuity? YES -Repair short in the wire between the PCM (D2) and APP sensor A. NO -Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Check for continuity between PCM connector terminal E12 and body ground. Is there continuity? YES -Go to step 79. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
Continue to check for continuity between PCM connector terminal E12 and body ground, while disconnecting these connectors one at a time. APP sensor 6P connector FTP sensor 6P connector Does continuity go away when one of the above components is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair short in the wire between the PCM (E12) and the APP sensor B or the FTP sensor.

Scheme 186

Scheme 186: Injector Replacement

Scheme 187

Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the quick-connect fitting (A) (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-removal) ).
Remove the fuel joint hose mounting bolt (B).
Disconnect the connectors (C) from the injectors.
Remove the fuel rail mounting bolts (D) from the fuel rails (E).
Remove the fuel rails and the injectors from the injector base.
Remove the injector clips (F) from the fuel rails.
Remove the injectors from the fuel rails.
Coat the new O-rings (black) (A) with clean engine oil, and insert the injectors (B) into the fuel rails (C).
Install the injector clips (D).
Coat the new injector O-rings (green) (E) with clean engine oil.
Install the fuel rails and the injectors in the injector base (F).
Install the fuel rail mounting bolts, and connect the injector connectors.
Install the fuel joint hose mounting bolt.
Connect the quick-connect fitting (see «FUEL LINE/QUICK-CONNECT FITTING INSTALLATION»(/acura/rl/ii-2008-2012/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-installation) ).
Turn the ignition switch to 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 leaks.
Install the intake manifold with a new gasket (see «INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).

Scheme 188

Scheme 188: MAP Sensor Replacement

Remove the engine cover (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the MAP sensor connector (A).
Remove the screw (B).
Remove the MAP sensor (C).
Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 189

Scheme 189: MAF Sensor/IAT Sensor Replacement

Disconnect the MAF sensor/I AT senor 5P connector (A).
Remove the screws (B).
Remove the MAF sensor/IAT sensor (C).
Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 190

Scheme 190: ECT Sensor 1 Replacement

Drain the engine coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Remove the engine cover (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the ECT sensor 1 2P connector (A).
Remove ECT sensor 1 (B).
Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 191

Scheme 191: ECT Sensor 2 Replacement

Remove the splash shield (see «SPLASH SHIELD REPLACEMENT»(/acura/rl/ii-2008-2012/remont/exterior-body-panels/#fenderwell__splash-shield-replacement) ).
Drain the engine coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).
Disconnect the ECT sensor 2 2P connector (A).
Remove ECT sensor 2 (B).
Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/rl/ii-2008-2012/remont/cooling-system-mechanical/#cooling-system) ).

A/F Sensor Replacement

Special Tools Required

O2 sensor wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available

Scheme 192

Scheme 192: Front Bank (Bank2)

Disconnect the front A/F sensor 6P connector (A), then remove the A/F sensor (B).
Install the parts in the reverse order of removal.

Scheme 193

Scheme 193: Rear Bank (Bank1)

Disconnect the rear A/F sensor 6P connector (A), then remove the A/F sensor (B).
Install the parts in the reverse order of removal.

Secondary HO2S Replacement

Special Tools Required

O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available

Scheme 194

Scheme 194: Front Bank (Bank 2)

Disconnect the front secondary HO2S 4P connector (A), then remove the front secondary HO2S (B) with an O2 sensor socket wrench.
Install the parts in the reverse order of removal.

Scheme 195

Scheme 195: Rear Bank(Bank 1)

Disconnect the rear secondary HO2S 4P connector (A), then remove the rear secondary HO2S (B) with an O2 sensor socket wrench.
Install the parts in the reverse order of removal.

Scheme 196

Scheme 196: CMP Sensor Replacement

Scheme 197

Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ).
Remove the front camshaft pulley (CMP sensor pulse plate) (A).
Disconnect the CMP sensor connector (B), then remove the back cover (C).
Remove the CMP sensor (A) from the back cover.
Install the parts in the reverse order of removal. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head__timing-belt-installation) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

Scheme 198

Scheme 198: CKP Sensor Replacement

Move the auto-tensioner to remove tension from the drive belt, then remove the belt (see «TIMING BELT REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ).
Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ).
Remove the upper and lower timing belt covers from the engine (see «TIMING BELT REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#cylinder-head) ).
Remove CKP sensor A/B (A) from the oil pump.
Install the parts in the reverse order of removal.
Clear the CKP pattern with the HDS.
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

Scheme 199

Scheme 199: Knock Sensor Replacement

Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Remove the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/rl/ii-2008-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
Disconnect the knock sensor connector (A), then remove the knock sensor (B).
Install the parts in the reverse order of removal.

PCM Update

Special Tools Required

Honda diagnostic system (HDS) tablet tester
Honda interface module (HIM) and an iN workstation with HDS and CM update software
HDS pocket tester
GNA600 and an iN workstation with HDS and CM update software

Use any one of these update tools.

Note. Make sure the HDS/HIM has the latest software version downloaded from the iN (interactive network). Before you update the PCM, make sure the battery in the vehicle is fully charged, and connect a jumper battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to ACC (0) or to LOCK (I) during the update. If there is a problem with the update, leave the ignition switch in ON (II). To prevent PCM damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update. To ensure the latest program is installed, do a PCM update whenever the PCM is substituted or replaced. You cannot update a PCM with a program it already has. It will only accept a new program. If you need to diagnose the Honda interface module (HIM) because the HIM's red (# 3) light came on or was flashing during the update, leave the ignition switch in ON (II) when you disconnect the HIM from the data link connector (DLC). This will prevent PCM damage.

Scheme 200

Turn the ignition switch to ON (II), but do not start the engine.
Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ). If you are returning from the DLC circuit troubleshooting, skip step s 4 and 5 and clean the throttle body after updating the PCM.
Select the INSPECTION MENU with the HDS.
Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts. NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.
Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to update the PCM.
If the software in the PCM is the latest, disconnect the HDS/HIM from the DLC, and go back to the procedure that you were doing. If the software in the PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both. NOTE: If the PCM update system requires you to cool the PCM, follow the screen prompts. If there is a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100 %, D or immobilizer indicator flashes, HDS tablet freezes, etc.), follow these step s to minimize the chance of damaging the PCM: Leave the ignition switch in the ON (II) position. Connect a jumper battery (do not connect a battery charger). Shut down the HDS. Disconnect the HDS from the DLC. Reboot the HDS. Reconnect the HDS to the DLC, and try the update procedure again.
If the TP POSITION CHECK failed in step 5, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

PCM Replacement

Special Tools Required

Honda diagnostic system (HDS) tablet tester
Honda interface module (HIM) and an iN workstation with HDS and CM update software
HDS pocket tester
GNA600 and an iN workstation with HDS and CM update software

Use any one of these update tools.

Note. Make sure the HDS has the latest software version. If you are replacing the PCM after substituting a known-good PCM, reinstall the original PCM, then do this procedure. During the procedure, if any READ DATA, WRITE DATA, or other data checks fail, note the failure, then continue.

Scheme 201

Scheme 202

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Turn the ignition switch to ON (II).
Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ). If you are returning from DLC circuit troubleshooting, skip step s 4 through 9,17 through 19, 22, and 23, then do this after replacing the PCM: Replace the engine oil (see «ENGINE OIL LEVEL CHECK»(/acura/rl/ii-2008-2012/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rl/ii-2008-2012/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ). Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
Select the PGM-FI system with the HDS.
Select the INSPECTION MENU with the HDS.
Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts. NOTE: If the TP POSITION CHECK indicates FAILED, continue with this procedure.
Select the REPLACE PCM MENU, then select READ DATA, and follow the screen prompts. NOTE: Doing this step copies (READS) the engine oil life data from the original PCM so you can later download (WRITE) it into the new PCM. If the READ DATA indicates FAILED, continue with this procedure.
Turn the ignition switch to LOCK (0).
Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/rl/ii-2008-2012/remont/body-electrical/#battery) ).
Remove the front console covers (A) (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/rl/ii-2008-2012/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ), and pull back the carpet.
Remove the ducts (B).
Disconnect the PCM connectors (C).
Remove the bolts (D), then remove the PCM (E).
Install the parts in the reverse order of removal.
Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/rl/ii-2008-2012/remont/body-electrical/#battery) ).
Turn the ignition switch to ON (II).
Manually input the VIN to the PCM with the HDS. NOTE: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the PCM, ignore it, and continue this procedure.
If the READ DATA (engine oil life) failed in step 7, go to step 21 . Otherwise, go to step 19.
Select the PGM-FI system with the HDS.
Select the REPLACE PCM MENU, then select WRITE DATA and follow the screen prompts. NOTE: If the WRITE DATA indicates FAILED, continue this procedure.
Select IMMOBI system with the HDS.
Enter the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
If the TP POSITION CHECK failed in step 6, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 24.
If the READ DATA failed in step 7 or the WRITE DATA failed in step 20, replace the engine oil (see «ENGINE OIL LEVEL CHECK»(/acura/rl/ii-2008-2012/remont/lubrication-system/#engine-lubrication) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rl/ii-2008-2012/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 25.
Select PGM-FI system, and reset the PCM with the HDS.
Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2008-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rl/ii-2008-2012/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

Pgm-Fi System Acura RL II рестайлинг

Scheme 1

Scheme 2

DTC P0101: MAF Sensor Circuit Range/ Performance Problem

DTC P0102: MAF Sensor Circuit Low Voltage

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

DTC P0103: MAF Sensor Circuit High Voltage

Scheme 8

Scheme 9

Scheme 10

DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 11

Scheme 12

Scheme 13

DTC P0108: MAP Sensor Circuit High Voltage

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

DTC P0111: IAT Sensor Circuit Range/ Performance Problem

DTC P0112: IAT Sensor Circuit Low Voltage

Scheme 19

DTC P0113: IAT Sensor Circuit High Voltage

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

DTC P0116: ECT Sensor 1 Circuit Range/ Performance Problem

DTC P0117: ECT Sensor 1 Circuit Low Voltage

Scheme 25

DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

DTC P0128: Cooling System Malfunction

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

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

Scheme 31

Scheme 32

Scheme 33

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

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

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

Scheme 44

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

Scheme 45

Scheme 46

Scheme 47

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

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

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

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

Scheme 57

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