Pgm-Fi System — Acura RL II (2004-2008)

Scheme 1

Scheme 1: Component Location Index

Scheme 2

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 3

Scheme 3: DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 4

Scheme 5

Turn the ignition switch 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 OFF.
Disconnect the MAP sensor 3P connector.
Turn the ignition switch 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 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 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 OFF.
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 OFF.
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 6

Scheme 6: DTC P0108: MAP Sensor Circuit High Voltage

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Turn the ignition switch 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 OFF.
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 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 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 OFF.
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 OFF.
Connect PCM connector terminals C4 and C5 with a jumper wire.
Turn the ignition switch 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 OFF.
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 sensor 1 and the IAT sensor. Are the connections and terminals OK? YES - Go to step 2. NO - Repair the connectors or terminals, then go to step 15 .
Remove the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the IAT sensor to cool to ambient temperature.
Note the ambient temperature.
Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
Turn the ignition switch ON (II).
Note the value of the 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 - Go to step 13 . NO - Go to step 9.
Disconnect the IAT sensor from the 2P connector.
Using a heat gun, blow hot air on the IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
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 OFF.
Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 11

Scheme 11: DTC P0112: IAT Sensor Circuit Low Voltage

Turn the ignition switch ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or higher, 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 OFF.
Disconnect the IAT sensor 2P connector.
Turn the ignition switch ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or higher, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between IAT sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the IAT sensor and the PCM (A5), then go to step 13 . NO - Go to step 18 .
Turn the ignition switch OFF.
Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 12

Scheme 12: DTC P0113: IAT Sensor Circuit High Voltage

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Turn the ignition switch ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F( -40°C) or less, or 4.90 V or more indicated? YES - Go to step 3. NO - Intermittent failure, 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 OFF.
Disconnect the IAT sensor 2P connector.
Connect IAT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
Turn the ignition switch ON (II).
Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES - Go to step 8. NO - Go to step 18 .
Turn the ignition switch OFF.
Remove the jumper wire from the IAT sensor 2P connector.
Turn the ignition switch ON (II).
Measure voltage between IAT sensor 2P connector terminal No. 1 and body ground. Is there about 5V? YES - Go to step 12. NO - Go to step 17 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector C (22P).
Connect IAT sensor 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 the IAT sensor, then go to step 20 .
Measure 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 IAT sensor, then go to step 20 . NO - Go to step 25 .
Turn the ignition switch OFF.
Replace the IAT sensor (see «IAT SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 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 (in Park or neutral) 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 OFF.
Open the hood, and let the engine cool for 3 hours.
Turn the ignition switch 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 OFF.
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 17

Scheme 17: DTC P0117: ECT Sensor 1 Circuit Low Voltage

Turn the ignition switch ON (II).
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or higher, 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 OFF.
Disconnect ECT sensor 1 2P connector.
Turn the ignition switch ON (II).
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F(180°C) or higher, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
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 OFF.
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 18

Scheme 18: DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Turn the ignition switch 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 OFF.
Disconnect 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 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 OFF.
Remove the jumper wire from ECT sensor 1 2P connector.
Turn the ignition switch ON (II).
Measure 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 OFF.
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 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 OFF.
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 - Go to step 9 . NO - Go to step 3.
Allow the engine to cool to 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.
Note the value of ECT SENSOR 2 in the DATA LIST with the HDS.
Compare ECT SENSOR 2 and the recorded temperature. Did ECT SENSOR 2 change 17°F (9.5°C) or more? YES - 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 NO - Check the thermostat (see «FAN MOTOR TEST»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ), then go to step 9.
Turn the ignition switch OFF.
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Allow the engine to cool to the ambient temperature.
Start the engine, and let it idle 20 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0125 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 17.
Monitor the OBD STATUS for DTC P0125 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 16 , go to the indicated DTCs 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 15 .

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 ON (II).
Clear the DTC with the HDS.
Turn the blower switch OFF.
Turn the A/C switch OFF.
Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES - Go to step 6. NO - Wait until the FAN CTRL is off, then go to step 6.
Check the radiator fan operation. Does the radiator fan keep running? YES - Check the cooling system (see «RADIATOR CAP TEST»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ). If the cooling system is OK, go to step 20 . NO - Go to step 7.
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 - 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 NO - Test the thermostat (see «FAN MOTOR TEST»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ), then go to step 13.
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#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 19.
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 18 , go to the indicated DTCs 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 17 .
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 Park or neutral) 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 21 . If the PCM was substituted, go to step 1 . NO - Go to step 25.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24 , go to the indicated DTCs 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 21 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 21 .

DTC P0133: Rear A/F Sensor (Bank 1, Sensor 1) Circuit Slow Response; DTC P0153: Front A/F Sensor (Bank 2, Sensor 1) Circuit 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 ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 P01531 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, 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 OFF.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 DTCs 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 12 .

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 P01541. Information marked with an asterisk (*) applies to the front bank (Bank 2).

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (in Park or neutral) until the radiator fan comes on.
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), the under-dash fuse/relay box, and the PCM
Turn the ignition switch OFF.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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), the under-dash fuse/relay box, and the PCM, then go to step 1 . NO - Go to step 12.
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 11 , go to the indicated DTCs 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.

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 23

Scheme 23: DTC P0135: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction; DTC P0155: Front A/F Senso

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Turn the ignition switch 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 OFF.
Check these fuses: No. 19 OPTION (40A) fuse in the under-hood fuse/relay box. No. 4 A/F SENSOR (15A) fuse in the under-dash fuse/relay box. No. 23 IGP (7.5A) 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 A/F sensor relay (LAF), and the fuses, then go to step 24 . NO - Go to step 7.
Disconnect the A/F sensor (Sensor 1) 8P connector.
Measure resistance between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 2. Is there 2.5-3.2 ohms at room temperature? YES - Go to step 9. NO - Go to step 22 .
Check for continuity between each terminal at the A/F sensor (Sensor 1) 8P connector and body ground. Is there continuity? YES - Go to step 22 . NO - Go to step 10.
Check for continuity between A/F sensor (Sensor 1) 8P connector terminals No. 1 and No. 3, No. 4, No. 6, No. 7, and No. 8 individually. Is there continuity? YES - Go to step 22 . NO - Go to step 11.
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) 8P 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).
Connect A/F sensor (Sensor 1)8P 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. 4. 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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 P01551 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 DTCs 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.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 30 , go to the indicated DTCs 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-2004-2008/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 33

Scheme 33: DTC P0137: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage; DTC P0157: Front Secondary HO

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 OFF.
Disconnect the secondary HO2S (Sensor 2) 4P connector.
Turn the ignition switch 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 OFF.
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 OFF.
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 DTCs 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 .
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 Park or neutral) 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 position 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-2004-2008/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 27.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 26 , go to the indicated DTCs 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-2004-2008/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, go to step 24 .

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 34

Scheme 34: DTC P0138: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage; DTC P0158: Front Secondary H

Scheme 35

Scheme 36

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 OFF.
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 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 OFF.
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 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 OFF.
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 OFF.
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 DTCs 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 .
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 Park or neutral) 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 position 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 30 . 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 32 , go to the indicated DTCs 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 30 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 30 .

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

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 OFF.
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in D position 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 P01591 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 DTCs 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 37

Scheme 37: DTC P0141: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction; DTC P0161: Front Secon

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Turn the ignition switch 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 OFF.
Check these fuses: No. 19 OPTION (40A) fuse in under-hood fuse/relay box. No. 4 A/F SENSOR (15A) fuse in under-dash fuse/relay box. No. 23 IGP (7.5A) 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 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.
Measure resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-6.6 ohms at room temperature? YES - Go to step 9. NO - Go to step 21 .
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 step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), 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. 4. 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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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 30.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 29 , go to the indicated DTCs 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-2004-2008/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 ). If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174, and/or P0175, troubleshoot those DTCs first, then recheck for P0171, P0172, P0174, and/or P0175. P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0133, P0153, P1172, P1173, P2195, P2197, P2237, P2238, P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2627, P2628, P2630, P2631, P2A00, P2A03: Air fuel ratio (A/F) sensor (Sensor 1) P0134, P0135, P0154, P0155: Air fuel ratio (A/F) sensor (Sensor 1) heater P0137, P0138, P0139, P0157, P0158, P0159, 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-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Check the valve clearances and adjust them if needed (DTC P0172 and P0175 only). If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 2. NO - Check these items: If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rl/ii-2004-2008/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 feed pipe, and the fuel filter. If they are all OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 2.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Drive at a steady speed between 25-55 mph (40-88 km/h) for 5 minutes, then drive at a steady speed between 15-75 mph (24-120 km/h) for 15 minutes. NOTE: DTC P0171, P0172, P0174, and/or P0175 may take up to 80 minutes of test driving to set. Using the HDS, monitor the long term fuel trim (LT FUEL TRIM) or the air fuel feed back average (AF FB AVE). If the long term fuel trim/air fuel feed back average stays within 0.86-1.17, 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 - Check for poor connections or loose terminals at the PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P0300: Random Misfire and Some 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 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): P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0171, P0172: 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 46

Clear the DTC with the HDS.
Start the engine, and let it idle without load (in Park or neutral).
Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 8 . NO - If the screen indicates PASSED, go to step 5 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then recheck.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 8 . NO - Go to step 5.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) 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 8 . 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 5 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 8. NO - Intermittent failure, the system is OK at this time
Turn the ignition switch OFF.
Check the fuel quality. Is the quality good? YES - Go to step 10. NO - Drain the fuel tank (see «FUEL TANK DRAINING»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-tank-draining) ), and fill it with a known-good fuel, then go to step 19 .
Inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/rl/ii-2004-2008/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 TP SENSOR A CLV (calculated load value) 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 13. NO - Go to step 19 .
Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Go to step 14. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 19 . If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-regulator-replacement) ), then go to step 19 .
Turn the ignition switch OFF.
Remove the rocker arm oil pressure switch (VTEC oil pressure switch) (A), and install the special tools as shown, then attach the rocker arm oil pressure switch (VTEC oil pressure switch) to the pressure gauge adapter (B). NOTE: Install the parts in the reverse order of removal with a new O-ring.
Reconnect the rocker arm oil pressure switch (VTEC oil pressure switch) 2P connector.
Start the engine. Hold the engine speed at 3000 RPM without load (in Park or neutral) until the radiator fan comes on.
Check the oil pressure at engine speeds of 1000 and 2000 RPM. Keep the measuring time as short as possible (less than 1 minute) because the engine is running without load. Is the oil pressure below 49 kPa (0.5 kgf/cm 2 , 7 psi)? YES - Check for air in the fuel line, then go to step 19. NO - Inspect the VTEC system (see «VTEC ROCKER ARM TEST»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ), then go to step 19.
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) ECT SENSOR 1
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 coil, the injector, and the PCM, then go to step 1 . NO - Go to step 26.
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 25 , go to the indicated DTCs troubleshooting NO - If the screen indicates FAILED, check for poor connection or loose terminals at the ignitions 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 24 .

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 47

Scheme 47: DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: N

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Turn the ignition switch ON (II).
Do the DTC CLEAR in the CLEAR MENU with the HDS.
Start the engine (in Park or neutral), then let it idle without load.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, 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 TP SENSOR A CLV (calculated load value) 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 9 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 8 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. Check the fuel and ignition system circuit connectors for loose wires or poor connections
Turn the ignition switch OFF.
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) 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 13. NO - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Check for poor connections or loose terminals at the ignition coils
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-2004-2008/remont/ignition-system/#ignition-system) ), then go to step 55 . NO - Go to step 14.
Turn the ignition switch OFF.
Exchange the spark plug from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) 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 18. NO - Intermittent misfire 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 54 . NO - Go to step 19.
Turn the ignition switch OFF.
Exchange the injector from the problem cylinder with one from another cylinder.
Start the engine, and let it idle 2 minutes.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) 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 24. NO - Intermittent misfire due to bad contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 55 . NO - Go to step 25.
Turn the ignition switch OFF.
Disconnect the ignition coil 3P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 29. NO - Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 55 .
Turn the ignition switch OFF.
Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 31. NO - Repair open in the wire between the ignition coil and G101, then go to step 55 .
Turn the ignition switch OFF.
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 «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION 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 35.
Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 YEL/GRN No. 2 P0302 BLU/RED No. 3 P0303 WHT/BLU No. 4 P0304 BRN No. 5 P0305 BLK/RED No. 6 P0306 BRN/WHT
Check for continuity between body ground and the appropriate PCM connector terminal (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION 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 37. NO - Repair open in the wire between the PCM and the ignition coil, then go to step 55 .
Reconnect the ignition coil 3P connector and PCM connector A (31P).
Do an engine compression and a cylinder leakdown test. Did the engine pass both tests? YES - Go to step 39. NO - Repair the engine, then go to step 55 .
Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Did the engine pass the test? YES - Go to step 40. NO - Repair the VTEC rocker arm, then go to step 55 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Turn the ignition switch ON (II).
Measure voltage between body ground and the appropriate PCM connector terminal (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION 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 54 . NO - Go to step 45.
Turn the ignition switch OFF.
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Disconnect the injector 2P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between injector 2P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 50. 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 OFF.
Check for continuity between body ground and the appropriate PCM connector terminal (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION 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 52.
Connect appropriate injector 2P connector terminal No. 1 to body ground with a jumper wire (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 BRN No. 2 P0302 RED No. 3 P0303 BLU No. 4 P0304 YEL No. 5 P0305 BLK/RED No. 6 P0306 WHT/BLU
Check for continuity between body ground and the appropriate PCM connector terminal (see «WIRE COLOR SPECIFICATION»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). WIRE COLOR SPECIFICATION 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 54. NO - Repair open in the wire between the PCM and the injector, then go to step 55 .
Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES - Go to step 65 . NO - Replace the injector (see «INJECTOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 55.
Reconnect all connectors.
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS TP SENSOR A CLV (calculated load value) 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 63.
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 63, go to the indicated DTCs 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 61 .
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 66 . If the PCM was substituted, go to step 1 . NO - Go to step 68.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 67 , go to the indicated DTCs 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 67 . 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 67 .

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 58

Scheme 58: DTC P0325: Knock Sensor Circuit Malfunction

Scheme 59

Scheme 60

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 OFF.
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, then go to step 17 . 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, then go to step 17 .
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Check the knock sensor subharness 1P connector and the knock sensor for an open or short. Is the harness OK? YES - Go to step 15. NO - Repair the knock sensor subharness, then go to step 17 .
Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Install the intake manifold (see «INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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, then go to step 1 . NO - Go to step 23.
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 22 , go to the indicated DTCs 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 21 .
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 Park or neutral) 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 26 . If the PCM was substituted, go to step 1 . NO - Go to step 28.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 27 , go to the indicated DTCs 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-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 26 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 26 .

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

Scheme 61

Scheme 61: DTC P0335: CKP Sensor A No Signal; DTC P0385: CKP Sensor B No Signal

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Turn the ignition switch 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 OFF.
Disconnect CKP sensor A/B 6P connector (see «CKP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Measure voltage between CKP sensor A/B 6P connector terminal No. 6 (No. 3)* and body ground. Is there battery voltage? YES - Go to step 9. NO - Repair open in the wire between CKP sensor A/B and PGM-FI main relay 1 (Fl MAIN), then go to step 18 .
Measure voltage between CKP sensor A/B 6P connector terminal No. 5 (No. 2)* and body ground. Is there about 5 V? YES - Go to step 10. NO - Go to step 11 .
Measure voltage between CKP sensor A/B 6P connector terminals No. 4 (No. 1)* and No. 6 (No. 3)*. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between CKP sensor A/B and G101, then go to step 18 .
Measure 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 OFF.
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 26 .
Turn the ignition switch OFF.
Replace CKP sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

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

Turn the ignition switch 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-2004-2008/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-2004-2008/remont/mechanical/#cylinder-head) ), then go to step 9 . NO - Go to step 7.
Turn the ignition switch OFF.
Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
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 DTCs 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 66

Scheme 66: DTC P0340: CMP Sensor No Signal

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Turn the ignition switch 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 OFF.
Disconnect the CMP sensor 3P connector.
Turn the ignition switch ON (II).
Measure voltage between CMP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9. NO - Repair open in the wire between the CMP sensor and PGM-FI main relay 1 (Fl MAIN), then go to step 18 .
Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 10. NO - Go to step 11 .
Measure voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between the CMP sensor and G101, then go to step 18 .
Measure 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 OFF.
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 OFF.
Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P0344: CMP Sensor 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 ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle 10 seconds.
Check the CMP NOISE 2 count in the DATA LIST with the HDS. Are 0 counts indicated? YES - Go to step 7 . NO - Go to step 5.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
Check the CMP NOISE 2 count in the DATA LIST with the HDS. Are 0 counts 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 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 8. NO - Reconnect or repair the connectors or terminals, then go to step 11 .
Check for damage to the CMP sensor pulse projection on the front camshaft pulley (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ). Is there damage? YES - Replace the front camshaft pulley (see «CAMSHAFT, ROCKER ARM ASSEMBLY, CAMSHAFT SEAL, AND PULLEY INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head) ), then go to step 11 . NO - Go to step 9.
Turn the ignition switch OFF.
Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch 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-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Start the engine, and let it idle 10 seconds.
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 DTCs troubleshooting

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 beset. 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 ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/Con 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 Park or neutral) 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-2004-2008/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-2004-2008/remont/body-electrical/#battery) )
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con 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 Park or neutral) 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 DTCs 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 71

Scheme 71: DTC P0563: PCM Power Source Circuit Unexpected Voltage

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Wait 10 seconds.
Turn the ignition switch 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) (15A) fuse in the under-hood fuse/relay box and the PCM.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Measure 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 step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). 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 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 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 step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (Fl MAIN) (A) from the under-dash fuse/relay box.
Measure 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 ON (II).
Reset the PCM with the HDS.
Turn the ignition switch OFF.
Wait for 10 seconds.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «BATTERY TEST»(/acura/rl/ii-2004-2008/remont/body-electrical/#battery) ).
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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 update is not completed. Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF before completion, the PCM can be damaged.

Do the PCM update procedure (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0602 indicated? YES - Replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - The update is complete

DTC P0603: 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 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0603 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P0630: VIN Not Programmed or Mismatch

Turn the ignition switch 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 P0603 indicated? YES - Do the troubleshooting for P0603 (see «DTC P0603: PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__dtc-p0603-pcm-internal-control-module) ) NO - Go to step 9 .
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 5 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0603 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

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

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 does not return after clearing the DTC, or if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before you replace the PCM.

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0685 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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P0700: A/T Control 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 ). This DTC is stored when there is a problem in the A/T control system. Check for A/T DTCs with the HDS, and go to the indicated DTCs 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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 connectors or terminals, then go to step 27 .
Turn the ignition switch 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 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 6.
Turn the ignition switch OFF.
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/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 into the engine.
Turn the ignition switch 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 outside 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-2004-2008/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-2004-2008/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 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 19.
Turn the ignition switch OFF.
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the sensors to cool to 77°F (25°C).
Note the ambient temperature.
Connect ECT sensor 1 to its 2P connector and ECT sensor 2 to its 2P connector, but do not install them onto the engine.
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 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 ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 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 6 . 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 Park or neutral) 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 position 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 OFF.
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 position 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 DTCs 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 13 .

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 Park or neutral) 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 position 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 OFF.
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 position 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 DTCs 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 13 .

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 ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 OFF.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
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 DTCs 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 79

Scheme 79: DTC P1297: ELD Circuit Low Voltage

Turn the ignition switch 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 OFF.
Disconnect the ELD 3P connector.
Turn the ignition switch 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 OFF.
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 OFF.
Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/body-electrical/#under-hood-fuserelay-box) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 80

Scheme 80: DTC P1298: ELD Circuit High Voltage

Scheme 81

Scheme 82

Scheme 83

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 OFF.
Disconnect the ELD 3P connector.
Turn the ignition switch ON (II).
Measure voltage between ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 7. NO - Repair open in the wire between the No. 18 ACG (15A) fuse and the ELD, then go to step 14 .
Turn the ignition switch OFF.
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-2004-2008/remont/body-electrical/#under-hood-fuserelay-box) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P1549: Charging System High Voltage

Turn the ignition switch 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 Park or neutral) 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-2004-2008/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 ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 Park or neutral) 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 DTCs 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 ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/Con 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 Park or neutral) 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-2004-2008/remont/body-electrical/#battery) )
Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box Are the connections and terminals OK? YES - Go to step 8. NO - Reconnect or 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-2004-2008/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 ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con 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 Park or neutral) 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 DTCs 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 84

Scheme 84: DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage

Scheme 85

Scheme 86

Scheme 87

Check for poor connections at the alternator 4P connector. Are the connections OK? YES - Go to step 2. NO - Reconnect or repair the connector, then go to step 19 .
Turn the ignition switch 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 Park or neutral) 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 OFF.
Disconnect the alternator 4P connector.
Turn the ignition switch ON (II).
Measure voltage between alternator 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 12. NO - Repair open in the wire between the alternator (IG1 line) and the No. 18 ACG (15A) fuse in the driver's under-dash fuse/relay box, then go to step 18 .
Measure voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/charging-system/#charging-system) ), then go to step 18 . NO - Go to step 13.
Turn the ignition switch OFF.
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 26 . NO - Repair open in the wire between the PCM (A12) and the alternator, then go to step 18.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con 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 Park or neutral) 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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 Headlights on high beam
Hold the engine speed at 2,000 RPM (in Park or neutral) 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-2004-2008/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 - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 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-2004-2008/remont/engine-control-systems/#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 DTCs 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 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-2004-2008/remont/engine-control-systems/#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 DTCs 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 88

Scheme 88: DTC P16BF: Starter Relay STRLY Circuit Malfunction

Turn the ignition switch ON (II).
Clear the DTC with the HDS and wait 5 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF 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, starter relay 2, and the PCM
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Remove starter relay 1 and starter relay 2.
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 9. NO - Go to step 14 .
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 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 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 6.
Turn the ignition switch OFF.
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rl/ii-2004-2008/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 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 2 REPLACEMENT»(/acura/rl/ii-2004-2008/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 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-2004-2008/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 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 19.
Turn the ignition switch OFF.
Drain the coolant (see «COOLANT CHECK»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).
Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Allow the sensors to cool to ambient temperature.
Note the ambient temperature.
Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install them on the engine.
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 ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 89

Scheme 89: DTC P2184: ECT Sensor 2 Circuit Low Voltage

Turn the ignition switch ON (II).
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or higher, 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 OFF.
Disconnect ECT sensor 2 2P connector.
Turn the ignition switch ON (II).
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or higher, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
Turn the ignition switch OFF.
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 OFF.
Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 90

Scheme 90: DTC P2185: ECT Sensor 2 Circuit High Voltage

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Turn the ignition switch 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 OFF.
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 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 OFF.
Remove the jumper wire from ECT sensor 2 2P connector.
Turn the ignition switch ON (II).
Measure 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 OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector C (22P).
Connect ECT sensor 2 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 2, then go to step 20 .
Measure 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 OFF.
Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 P2T27, P2122 and P2138, or P2127 and P2138 is stored at the same time, troubleshoot those DTCs first, then recheck for DTC P2195 and/or P2197*.

Inspect the condition of the A/F sensor (Sensor 1). Is it loose in the exhaust pipe? YES - Go to step 2. NO - Go to step 4 .
Turn the ignition switch OFF.
Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 1 . NO - Go to step 8.
Monitor the OBD STATUS for DTC P2195 and/or P2197* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 7 , go to the indicated DTCs troubleshooting NO - If the screen indicates FAILED, check for poor connections or loose terminals at 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.

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 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 - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Throttle position between 14 degrees and 45 degrees for 2 seconds
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Intermittent failure, the system is OK at this time NO - If the screen indicates FAILED, go to step 7. If the screen indicates NOT COMPLETED, go to step 4 .
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Throttle position between 14 degrees and 45 degrees for 2 seconds
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2227 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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 - Go to step 13.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 12 , go to the indicated DTCs 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-2004-2008/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 . If the screen indicates NOT COMPLETED, go to step 10 .

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 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PGM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 95

Scheme 95: DTC P2237: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage; DTC P2240: Front A/F Sensor (

Scheme 96

Scheme 97

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 8P connector terminal No. 7 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 15 .
Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure 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 14.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24 , go to the indicated DTCs 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-2004-2008/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 DIP Circuit Low Voltage; DTC P2241: Front A/F Sensor (Bank 2, Sensor DIP Circuit Low Voltage

Note. Before you troubleshoot, record ail 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).

Scheme 98

Scheme 98: DTC P2238: Rear A/F Sensor (Bank 1, Sensor DIP Circuit Low Voltage; DTC P2241: Front A/F Sensor (Ban

Scheme 99

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P 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 14 . NO - Go to step 10.
Reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure voltage between PCM connector terminals B14 (B22)* and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 24.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs 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-2004-2008/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 100

Scheme 100: DTC P2243: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage; DTC P2247: Front A/F Senso

Scheme 101

Scheme 102

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1)8P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1)8P connector terminal No. 8 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 15 .
Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure 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 14.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24 , go to the indicated DTCs 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-2004-2008/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 103

Scheme 103: DTC P2245: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage; DTC P2249: Front A/F Sensor

Scheme 104

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P 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 14 . NO - Go to step 10.
Reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure voltage between PCM connector terminals B13 (B21)* and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 24.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs 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-2004-2008/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 105

Scheme 105: DTC P2251: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage; DTC P2254: Front A/F Sensor (

Scheme 106

Scheme 107

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P connector.
Disconnect PCM connector B (24P).
Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 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 .
Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure 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 14.
Replace the A/F sensor (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24 , go to the indicated DTCs 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-2004-2008/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 108

Scheme 108: DTC P2252: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage; DTC P2255: Front A/F Sensor (B

Scheme 109

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P 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 14 . NO - Go to step 10.
Reconnect PCM connector B (24P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure voltage between PCM connector terminals B12 (B20)* and C12. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs 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 OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
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-2004-2008/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 24.
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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs 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-2004-2008/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 P2270: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean; DTC P2271: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Rich; DTC P2272: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean; DTC P2273: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Rich

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Vehicle speed between 35-55 mph (56-88 km/h) Drive 1 minute or more
Monitor the OBD STATUS for DTC P2270, P2271, P2272*, and/or P2273* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, 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 OFF.
Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Vehicle speed between 35-55 mph (56-88 km/h) Drive 1 minute or more
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2270, P2271, P2272*, and/or P2273* 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 P2270, P2271, P2272*, and/or P2273* 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 DTCs 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 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 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 DTCs troubleshooting
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

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

Scheme 110

Scheme 110: DTC P2627: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage; DTC P2630: Front A/F Sensor

Scheme 111

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2627 and/or P2630* 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 OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector D (17P).
Check for continuity between PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Go to step 9. NO - Go to step 17 .
Disconnect the A/F sensor (Sensor 1) 8P connector.
Check for continuity between PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (D11 (D10)*) and the A/F sensor (Sensor 1), then go to step 12 . NO - Go to step 11.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2627 and/or P2630* 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 - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2627 and/or P2630* 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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

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

Scheme 112

Scheme 112: DTC P2628: Rear A/F Sensor (Bank 1, Sensor 1) Label Circuit High Voltage; DTC P2631: Front A/F Senso

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2628 and/or P2631* 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 OFF.
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 8P connector.
Disconnect PCM connector D(17P).
Connect A/F sensor (Sensor 1) 8P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between PCM connector terminal D11 (D10)* and body ground. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the PCM (D11 (D10)*) and the A/F sensor (Sensor 1), then go to step 19 .
Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector.
Disconnect PCM connector C (22P).
Connect A/F sensor (Sensor 1) 8P connector terminal No. 3 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 15. NO - Repair open in the wire between the PCM (C12) and the A/F sensor (Sensor 1), then go to step 19 .
Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect PCM connectors C (22P) and D (17P).
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle 2 minutes.
Measure voltage between PCM connector terminals D11 (D10)* and C12. Is there about 5 V? YES - Go to step 18. NO - Go to step 24 .
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2628 and/or P2631* 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 - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting
Turn the ignition switch OFF.
Reconnect all connectors.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2628 and/or P2631* 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-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs 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 ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70 °C) Transmission in D position Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,600 RPM or less Drive at an engine speed of 1,600 RPM. Accelerate to full open throttle for 5 seconds, then slow down with the throttle completely closed.
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 it is 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 OFF.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 position Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,600 RPM or less Drive at an engine speed of 1,600 RPM. Accelerate to full open throttle for 5 seconds, then slow down with the throttle completely closed.
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 DTCs 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); DTC U0155: F-CAN Malfunction (Gauge Control Module-PCM)

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

Scheme 117

Scheme 117: DTC U0073: F-CAN Malfunction (BUS-OFF); DTC U0155: F-CAN Malfunction (Gauge Control Module-PCM)

Scheme 118

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the navigation unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the E-pretensioner unit, and the PCM
Check for DTCs in the Body Electrical system DTCs menu with the HDS. Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 5. NO - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system__gauge-control-module-input-test) )
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
Disconnect the gauge control module 30P connector.
Disconnect the VSA modulator-control unit 47P connector.
Disconnect SH-AWD control unit connector A (26P).
Disconnect the navigation unit 20P connector.
Disconnect the adaptive cruise control (ACC) unit 20P connector.
Disconnect the TPMS control unit 20P connector.
Disconnect the E-pretensioner unit 14P connector.
Check for continuity between body ground and PCM connector terminals E15 and E26 individually. Is there continuity? YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the navigation unit, the SH-AWD control unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the e-pretensioner unit, and the PCM (E15 (E26)), then go to step 21 . NO - Go to step 17.
Check for continuity between PCM connector terminals E15 and E26. Is there continuity? YES - Repair short in the wires between the PCM E15 (CANH line) and E26 (CANL line), then go to step 21 . NO - Go to step 18.
Check for continuity between PCM connector terminal El 5 and these connector terminals: CONNECTOR TERMINAL REFERENCE Connector Terminal Gauge control module 28P No. 16 (WHT) VSA modulator-control unit 47P No. 14 (WHT) SH-AWD control unit 26P No. 11 (WHT) Navigation unit 20P No. 8 (WHT) Adaptive cruise control (ACC) unit 20P No. 10 (WHT) TPMS control unit 20P No. 19 (WHT) E-pretensioner unit 14P No. 3 (WHT) Is there continuity between the PCM terminal and each of the terminals in the chart? YES - Go to step 19. NO - Repair open in the wire between the PCM (E15) and the appropriate connector, then go to step 21 .
Check for continuity between PCM connector terminal E26 and these connector terminals: CONNECTOR TERMINAL REFERENCE Connector Terminal Gauge control module 28P No. 15(BLK) VSA modulator-control unit 47P No. 30 (BLK) SH-AWD control unit 26P No. 10(BLK) Navigation unit 20P No. 18 (BLK) Adaptive cruise control (ACC) unit 20P No. 20 (BLK) TPMS control unit 20P No. 10 (BLK) E-pretensioner unit 14P No. 5 (BLK) Is there continuity between the PCM terminal and each of the terminals in the chart? YES - Go to step 20. NO - Repair open in the wire between the PCM (E26) and the appropriate connector, then go to step 21 .
Referring to the following chart. Select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, TPMS, adaptive cruise control (ACC), and body electrical systems. Then check the connections at the control module indicated in the last column. If all the connections are OK, substitute the control module. After substituting the control module, check for DTCs with the HDS. CONTROL MODULE REFERENCE PGM-FI VSA SH-AWD Body Electrical ACC Control module U0155 86 41 77 B1168 B1169 B1178 113 Gauge Control Module U0073 U0114 U0122 U0155 83 86 41 77 B1168 B1169 B1178 110 111 PCM U0073 U0114 U0122 U0155 83 86 41 77 B1168 B1170 B1178 112 VSA-modulator control unit U0073 U0114 U0122 U0155 83 86 41 77 B1168 B1169 115 SH-AWD control unit U0073 U0104 U0155 83 86 -- B1171 B1178 110 111 112 113 115 Adaptive cruise control (ACC) unit Are the DTCs still indicated? YES - Substitute the remaining control modules, one at time, until the DTCs are no longer present, then replace the control module that made the DTCs go away. After replacing the faulty control module, go to step 21. NO - Replace the faulty control module, then go to step 21.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the navigation unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the E-pretensioner unit, and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting

DTC U0104: F-CAN Malfunction (Adaptive Cruise Control (ACC) Unit-PCM)

Scheme 119

Scheme 119: DTC U0104: F-CAN Malfunction (Adaptive Cruise Control (ACC) Unit-PCM)

Scheme 120

Scheme 121

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0104 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.. Check for poor connections or loose terminals at the gauge control module, the adaptive cruise control (ACC) unit, and the PCM
Check for a DTC in the DTCs MENU with the HDS. Is ACC DTC 110 or 111 indicated? YES - Go to step 5. NO - Go to step 8 .
Turn the ignition switch OFF.
Disconnect the adaptive cruise control (ACC) unit 20P connector.
Check for continuity between adaptive cruise control (ACC) unit 20P connector terminals No. 10 and No. 20. Is there continuity? YES - Substitute a known-good adaptive cruise control (ACC) unit, then go to step 15 and recheck. If DTC U0104 is not indicated, replace the original adaptive cruise control (ACC) unit, then go to step 15 . NO - Repair open in the wire between the adaptive cruise control (ACC) unit (No. 10 (No. 20)) and the PCM (E15 (E26)), then go to step 15 .
Check for a poor connection at the adaptive cruise control (ACC) unit 20P connector. Is the connection OK? YES - Go to step 9. NO - Repair the poor connection at the adaptive cruise control (ACC) unit 20P connector, then go to step 16 .
Turn the ignition switch OFF.
If not already done, disconnect the adaptive cruise control (ACC) unit 20P connector.
Turn the ignition switch ON (II).
Measure voltage between adaptive cruise control (ACC) unit 20P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 13. NO - Check the No. 29 (10A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 29 (10A) fuse and the adaptive cruise control (ACC) unit, then go to step 15 .
Turn the ignition switch OFF.
Check for continuity between adaptive cruise control (ACC) unit 20P connector terminal No. 9, No. 11, No. 12, and body ground individually. Is there continuity? YES - Substitute a known-good adaptive cruise control (ACC) unit, then go to step 15 and recheck. If DTC U0104 is not indicated, replace the original adaptive cruise control (ACC) unit, then go to step 15. NO - Repair open in the wire between the adaptive cruise control (ACC) unit and G501, then go to step 15.
Reconnect the adaptive cruise control (ACC) unit 20P connector.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0104 indicated? YES - Check for poor connections or loose terminals at the gauge control module, the adaptive cruise control (ACC) 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 DTCs troubleshooting

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

Scheme 122

Scheme 122: DTC U0114: F-CAN Malfunction (SH-AWD Control Unit-PCM)

Scheme 123

Scheme 124

Scheme 125

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0114 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the SH-AWD control unit, and the PCM
Check for Temporary DTCs or DTCs with the HDS. Is SH-AWD system DTC 41 and/or 77 indicated? YES - Go to step 5. NO - Go to step 8 .
Turn the ignition switch OFF.
Disconnect SH-AWD control unit connector A (26P).
Check for continuity between SH-AWD control unit connector terminals A10 and A11. Is there continuity? YES - Substitute a known-good SH-AWD control unit, then go to step 16 and recheck. If DTC U0114 is not indicated, replace the original SH-AWD control unit, then go to step 16 . NO - Repair open in the wire between the SH-AWD control unit (A12 (A10)* and the PCM (E15 (E26)*), then go to step 16 . *:CANL line
Check for a poor connection at SH-AWD control unit connectors A (26P) and B (8P). Is the connection OK? YES - Go to step 9. NO - Repair the poor connection at SH-AWD control unit connectors A (26P) and B (8P), then go to step 16 .
Turn the ignition switch OFF.
Disconnect SH-AWD control unit connector A (26P).
Turn the ignition switch ON (II).
Measure voltage between SH-AWD control unit connector terminal A13 and body ground. Is there battery voltage? YES - Go to step 13. NO - Check the SH-AWD system, then go to step 16 .
Turn the ignition switch OFF.
Disconnect SH-AWD control unit connector B (8P).
Check for continuity between body ground and SH-AWD control unit connector terminals B2 and B3 individually, and between SH-AWD control unit connector terminal A12 and body ground. Is there continuity? YES - Substitute a known-good SH-AWD control unit, then go to step 16 and recheck. If DTC U0114 is not indicated, replace the original SH-AWD control unit, then go to step 16. NO - Repair open in the wire between the SH-AWD control unit and G652, then go to step 16.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 DTCs troubleshooting

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

Scheme 126

Scheme 126: DTC U0122: F-CAN Malfunction (VSA Modulator-Control Unit-PCM)

Scheme 127

Scheme 128

Turn the ignition switch 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 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, and the PCM
Check for DTCs in the DTCs MENU with the HDS. Is VSA system DTC 86 indicated? YES - Go to step 5. NO - Go to step 8 .
Turn the ignition switch OFF.
Disconnect the VSA modulator-control unit 47P connector.
Check for continuity between VSA modulator-control unit 47P connector terminals No. 14 and No. 30. Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit, then go to step 15 . NO - Repair open in the wire between the VSA modulator-control unit (No. 14 (No. 30)) and the PCM (E15 (E26)), then go to step 15 .
Check for a poor connection at the VSA modulator-control unit 47P connector. Are the connection OK? YES - Go to step 9. NO - Repair the connection(s), then go to step 16 .
Turn the ignition switch OFF.
If not already done, disconnect the VSA modulator-control unit 47P connector.
Turn the ignition switch ON (II).
Measure voltage between VSA modulator-control unit 47P connector terminal No. 38 and body ground. Is there battery voltage? YES - Go to step 13. NO - Check the No. 18 (15A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 18 (15A) fuse and the VSA modulator-control unit, then go to step 15 .
Turn the ignition switch OFF.
Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground. Is there continuity? YES - Substitute a known-good VSA modulator-control unit, then go to step 15 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit, then go to step 15. NO - Repair open in the wire between the VSA modulator-control unit and G203, then go to step 15.
Reconnect the VSA modulator-control unit 47P connector.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#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 VSA modulator-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 DTCs troubleshooting

'08 model

Note. Information marked with an asterisk (*) applies to the CANL line.

Scheme 129

Scheme 129: '08 model

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P), then disconnect the HDS.
Measure resistance between PCM connector terminals E15 and E26*. Is there about 85-103 0, ? YES - Go to step 40 . NO - Go to step 5.
Disconnect gauge control module connector B (28P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
Disconnect the VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
Disconnect SH-AWD control unit connector A (26P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Disconnect the ACC unit 20P connector (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) ).
Disconnect e-pretensioner unit connector B (14P) (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ).
Disconnect TPMS unit connector B(20P) (see «TPMS INDICATOR OR TIRE(S) INDICATOR(S) DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/rl/ii-2004-2008/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-or-tires-indicators-does) ).
Check for continuity between PCM connector terminals E15 and E26*. Is there continuity? YES - Repair short in the wires between PCM connector terminals E15 and E26* NO - Go to step 12.
Connect PCM connector terminal E15 to body ground with a jumper wire.
Check for continuity between gauge control module connector B (28P) terminal No. 16 and body ground. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the PCM (E15) and the gauge control module
Check for continuity between VSA modulator-control unit 47P connector terminal No. 14 and body ground. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the PCM (E15) and the VSA modulator-control unit
Check for continuity between SH-AWD control unit connector A (26P) terminal No. 11 and body ground. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the PCM (E15) and the SH-AWD control unit
Check for continuity between ACC unit 20P connector terminal No. 10 and body ground. Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the PCM (E15) and ACC unit
Remove the jumper wire from PCM connector E (31P).
Connect PCM connector terminal E26* to body ground with a jumper wire.
Check for continuity between gauge control module connector B (28P) terminal No. 15* and body ground. Is there continuity? YES - Go to step 20. NO - Repair open in the wire between the PCM (E26) * and the gauge control module
Check for continuity between VSA modulator-control unit 47P connector terminal No. 30* and body ground. Is there continuity? YES - Go to step 21. NO - Repair open in the wire between the PCM (E26)* and the VSA modulator-control unit
Check for continuity between SH-AWD control unit connector A (26P) terminal No. 10* and body ground. Is there continuity? YES - Go to step 22. NO - Repair open in the wire between the PCM (E26) * and the SH-AWD control unit
Check for continuity between ACC unit 20P connector terminal No. 20* and body ground. Is there continuity? YES - Go to step 23. NO - Repair open in the wire between the PCM (E26)* and the ACC unit
Reconnect gauge control module connector B (28P).
Measure resistance between PCM connector terminals E15 and E26*. Is there about 2.34-2.86 kohms? YES - Go to step 25. NO - Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). If the HDS identifies the vehicle, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/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 resistance between PCM connector terminals E15 and E26*. Is there about 108-132 kohms? YES - Go to step 28. NO - Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) )
Disconnect the VSA modulator-control unit 47P connector.
Reconnect SH-AWD control unit connector A (26P).
Measure resistance between PCM connector terminals E15 and E26*. Is there about 2.34-2.86 kohms? YES - Go to step 31. NO - Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). If the HDS identifies the vehicle, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) )
Disconnect SH-AWD control unit connector A (26P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Reconnect the ACC unit 20P connector.
Measure 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 ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) ). If the HDS identifies the vehicle, replace the original ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) )
Disconnect the ACC unit 20P connector.
Reconnect e-pretensioner unit connector B (14P).
Measure 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 e-pretensioner unit (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ). If the HDS identifies the vehicle, replace the original e-pretensioner unit (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) )
Disconnect e-pretensioner unit connector B (14P).
Reconnect TPMS unit connector B (20P).
Measure 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ) NO - Substitute a known-good TPMS unit (see «TPMS INDICATOR OR TIRE(S) INDICATOR(S) DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/rl/ii-2004-2008/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-or-tires-indicators-does) ). If the HDS identifies the vehicle, replace the original TPMS unit (see «TPMS INDICATOR OR TIRE(S) INDICATOR(S) DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/rl/ii-2004-2008/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-or-tires-indicators-does) )
Disconnect gauge control module connector B (28P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
Disconnect the VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
Disconnect SH-AWD control unit connector A (26P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
Disconnect the ACC unit 20P connector (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) ).
Disconnect e-pretensioner unit connector B (14P) (see «E-PRETENSIONER UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ).
Disconnect TPMS unit connector B (20P) (see «TPMS INDICATOR OR TIRE(S) INDICATOR(S) DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/rl/ii-2004-2008/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-or-tires-indicators-does) ).
Check for continuity between PCM connector terminal E15 and body ground. Is there continuity? YES - Repair short in the wire between the PCM connector terminal E15 and the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the ACC unit, the e-pretensioner unit, the TPMS unit, or the DLC NO - Go to step 47.
Check for continuity between PCM connector terminal E26* and body ground. Is there continuity? YES - Repair short in the wire between PCM connector terminal E26* and the gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the ACC unit, the e-pretensioner unit, the TPMS unit, or the DLC NO - Go to step 48.
Reconnect all connectors.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Disconnect gauge control module connector B (28P).
Turn the ignition switch 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-2004-2008/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ) NO - Go to step 52.
Turn the ignition switch OFF.
Reconnect gauge control module connector B (28P).
Disconnect the VSA modulator-control unit 47P connector.
Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ) NO - Go to step 56.
Turn the ignition switch OFF.
Reconnect the VSA modulator-control unit 47P connector.
Disconnect SH-AWD control unit connector A (26P).
Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ) NO - Go to step 60.
Turn the ignition switch OFF.
Reconnect SH-AWD control unit connector A (26P).
Disconnect the ACC unit 20P connector.
Turn the ignition switch 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-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) ) NO - Go to step 64.
Turn the ignition switch OFF.
Reconnect the ACC unit 20P connector.
Disconnect e-pretensioner unit connector B (14P).
Turn the ignition switch 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-2004-2008/remont/airbag/#srs-supplemental-restraint-system__e-pretensioner-unit-replacement) ) NO - Go to step 68.
Reconnect e-pretensioner unit connector B (14P).
Disconnect TPMS unit connector B (20P).
Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the TPMS unit (see «TPMS INDICATOR OR TIRE(S) INDICATOR(S) DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/rl/ii-2004-2008/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-or-tires-indicators-does) ) NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )

Scheme 149

Scheme 149: MIL Circuit Troubleshooting

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

Scheme 169

Scheme 170

Scheme 171

Scheme 172

Scheme 173

Scheme 174

Scheme 175

Turn the ignition switch ON (II).
Do the gauge self-diagnostic procedure (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rl/ii-2004-2008/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 MIL circuit is OK, replace the original gauge control module
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and watch the MIL. Does the MIL stay off? YES - Go to step 17 . NO - Go to step 5.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), wait 20 seconds, and watch the MIL. Does the MIL stay on or flash more than 5 times? YES - Go to step 7. NO - The MIL circuit is OK
Turn the ignition switch OFF.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the PCM? YES - Go to step 10. NO - Go to " «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) "
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to the indicated DTCs troubleshooting NO - Go to step 11.
Check the MIL in the DATA LIST with the HDS. Does it indicate ON? YES - Go to step 12. NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module
Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES - Go to step 13. NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Try to start the engine. Does the engine start and idle smoothly? YES - Go to step 18. NO - Go to step 22 .
Turn the ignition switch OFF.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
Turn the ignition switch ON (II), and read the HDS. Does the HDS communicate with the PCM? YES - Go to step 21. NO - Go to " «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) "
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0073 and/or U0155 indicated? YES - Go to the indicated DTCs troubleshooting NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Turn the ignition switch OFF.
Inspect the No. 23 +B IG MAIN (50A) 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 (50A) fuse and the ignition switch. If the wire is OK, go to step 24. NO - Repair short in the wire between the No. 23 +B IG MAIN (50A) fuse and the under-hood fuse/relay box. Also replace the No. 23 +B IG MAIN (50A) fuse
Inspect the No. 8 Fl ECU (PCM) (15A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 31 . NO - Go to step 25.
Remove the blown No. 8 Fl ECU (PCM) (15A) fuse from the under-hood fuse/relay box.
Remove the left kick panel (see step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 1 (Fl MAIN) (A) from the driver's under-dash fuse/relay box.
Check for continuity between body ground and PGM-FI main relay 1 (Fl MAIN) 4P connector terminals No. 1 and No. 3 individually. Is there continuity? YES - Repair short in the wire between the No. 8 Fl ECU (PCM) (15A) fuse and PGM-FI main relay 1 (Fl MAIN). Also replace the No. 8 Fl ECU (PCM) (15A) fuse NO - Go to step 28.
Disconnect each of the components or connectors below, one at a time, while checking for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and body ground. PGM-FI main relay 2 (FUEL PUMP) PCM connector A (31P) Each injector 2P connector Camshaft position (CMP) sensor 3P connector Crankshaft position (CKP) sensor A/B 6P connector A/F sensor relay (LAF) 4P connector Radiator fan control (RFC) relay 4P 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 8 Fl ECU (PCM) (15A) fuse NO - Go to step 29.
Disconnect the connectors from these components: PGM-FI main relay 2 (FUEL PUMP) PCM connector A (31P) Injectors Camshaft position (CMP) sensor Crankshaft position (CKP) sensor A/B A/F sensor relay (LAF) Radiator fan control (RFC) relay
Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between PGM-FI main relay 1 (Fl MAIN) and each item. Also replace the No. 8 Fl ECU (PCM) (15A) fuse NO - Replace PGM-FI main relay 1 (Fl MAIN). Also replace the No. 8 Fl ECU (PCM) (15A) fuse
Turn the ignition switch ON (II).
Measure voltage between PCM connector terminal D6 and body ground. Is there battery voltage? YES - Go to step 33. NO - Repair open in the wire between the No. 19 FUEL PUMP (20A) fuse and the PCM (D6)
Measure voltage between PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 40 . NO - Go to step 34.
Turn the ignition switch OFF.
Remove the left kick panel (see step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (Fl MAIN) (A) from the driver's under-dash fuse/relay box.
Measure voltage between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 37. NO - Repair open in the wire between the No. 8 Fl ECU (PCM) (15A) fuse and PGM-FI main relay 1 (Fl MAIN)
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 4 and PCM connector terminal E5. Is there continuity? YES - Test PGM-FI main relay 1 (Fl MAIN) (see «POWER RELAY TEST»(/acura/rl/ii-2004-2008/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ) NO - Repair open in the wire between PGM-FI main relay 1 (Fl MAIN) and the PCM (E5)
Turn the ignition switch ON (II).
Measure voltage between body ground and PCM connector terminal A4. Is there battery voltage? YES - Go to step 50 . NO - Go to step 42.
Turn the ignition switch OFF.
Remove the left kick panel (see step 3 under «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ). Then remove PGM-FI main relay 1 (Fl MAIN) (A) from the driver's under-dash fuse/relay box.
Turn the ignition switch ON (II).
Measure voltage between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 46. NO - Repair open in the wire between the No. 8 Fl ECU (PCM) (15A) fuse and PGM-FI main relay 1 (FI MAIN)
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (31P).
Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and PCM connector terminal A4. Is there continuity? YES - Replace PGM-FI main relay 1 (Fl MAIN) NO - Repair open in the wire between PGM-FI main relay 1 (Fl MAIN) and the PCM (A4)
Measure voltage between body ground and PCM connector terminals A1, A2, A3, and B15 individually. Is there more than 0.2 V? YES - Repair open in the wire(s) that had more than 0.2 V between G101 and the PCM (A1, A2, A3, and B15) NO - Go to step 51.
Measure voltage between body ground and PCM connector terminal C6. Is there about 5 V? YES - Go to step 59 . NO - Go to step 52.
Turn the ignition switch OFF.
Disconnect the connector from each of the following sensors, one at a time, and measure voltage between body ground and PCM connector terminal C6 with the ignition switch ON (II). Manifold absolute pressure (MAP) sensor Output shaft (countershaft) speed sensor Is there about 5 V? YES - Replace the sensor that restored 5 V when disconnected NO - Go to step 54.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the connectors from these sensors: Manifold absolute pressure (MAP) sensor Output shaft (countershaft) speed sensor
Disconnect PCM connector C (22P).
Check for continuity between PCM connector terminal C6 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C6) and the MAP sensor or the output shaft (countershaft) speed sensor NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Measure voltage between body ground and PCM connector terminal C14. Is there about 5 V? YES - Go to step 67 . NO - Go to step 60.
Turn the ignition switch OFF.
Disconnect the connector from each of the following sensors, one at a time, while measuring voltage between body ground and PCM connector terminal C14 with the ignition switch ON (II). Intake manifold tuning (IMT) actuator Exhaust gas recirculation (EGR) valve Input shaft (mainshaft) speed sensor Is there about 5 V? YES - Replace the part that restored 5 V when disconnected NO - Go to step 62.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the connectors from these parts: Intake manifold tuning (IMT) actuator Exhaust gas recirculation (EGR) valve Input shaft (mainshaft) speed sensor
Disconnect PCM connector C (22P).
Check for continuity between PCM connector terminal C14 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C14) and the IMT actuator, the EGR valve, or the input shaft (mainshaft) speed sensor NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Measure voltage between body ground and PCM connector terminal D2. Is there about 5 V? YES - Go to step 75 . NO - Go to step 68.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector, and measure voltage between body ground and PCM connector terminal D2 with the ignition switch ON (II). Is there about 5 V? YES - Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ) NO - Go to step 70.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the APP sensor 6P connector.
Disconnect PCM connector D (17P).
Check for continuity between PCM connector terminal D2 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (D2) and the APP sensor NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Measure voltage between PCM connector terminal E12 and body ground. Is there about 5 V? YES - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ) NO - Go to step 76.
Turn the ignition switch OFF.
Disconnect the connector, from each of the following sensors, one at a time, and measure voltage between body ground and PCM connector terminal E12 with the ignition switch ON (II). Is there about 5 V? YES - Repair the sensor that restored 5 V when disconnected NO - Go to step 78.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the connectors from these sensors: Accelerator pedal position (APP) Fuel tank pressure (FTP) sensor
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E12 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (E12) and the APP sensor or the FTP sensor NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )

'05-07 models

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

Scheme 176

Scheme 176: '05-07 models

Scheme 177

Scheme 178

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 2. NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 Fl ECU (PCM) (15A) fuse in the under-hood fuse/relay box
Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 3. NO - Repair open in the wire between DLC terminal No. 4 and body ground (G501)
Measure voltage between DLC terminals No. 5 and No. 16. Is there battery voltage? YES - Go to step 4. NO - Repair open in the wire between DLC terminal No. 5 and body ground (G501)
Turn the ignition switch ON (II).
Measure voltage between DLC terminals No. 5 and No. 7. Is there 8.5 V or more? YES - Go to step 11 . NO - Go to step 6.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between DLC terminal No. 7 and body ground. Is there continuity? YES - Repair short to ground in the wire between DLC terminal No. 7 and the PCM (E14). After repairing the wire, check for a DTC with the HDS and go to the indicated DTCs troubleshooting NO - Go to step 10.
Check for continuity between DLC terminal No. 7 and PCM connector terminal E14. Is there continuity? YES - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ) NO - Repair open in the wire between DLC terminal No. 7 and the PCM (E14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS and go to the indicated DTCs troubleshooting
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Turn the ignition switch ON (II).
Measure voltage between DLC terminals No. 5 and No. 7. Is there 0 V? YES - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ) NO - Repair short to power in the wire between DLC terminal No. 7 and the PCM (E14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS, and go to the indicated DTCs troubleshooting

Note. Make sure the HDS and the DLC cable of the HDS is normal.

Scheme 183

Scheme 183: '08 model

Scheme 184

Scheme 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

Scheme 197

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

Scheme 203

Turn the ignition switch OFF.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). NOTE: Make sure the HDS is properly connected to the DLC.
Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Go to step 4. NO - Go to step 21 .
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 DTCs troubleshooting NO - Go to step 5.
Turn the ignition switch OFF.
Turn the ignition switch 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-2004-2008/remont/airbag/#srs-supplemental-restraint-system) ) NO - Go to step 7.
Turn the ignition switch OFF.
Turn the ignition switch 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-2004-2008/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ) NO - Go to step 9.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES - Go to the immobilizer system's troubleshooting (see «SYMPTOM TROUBLESHOOTING»(ref-295623-S15500468192008081500000) ) NO - Go to step 11.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and watch the SH-AWD indicator. Does the SH-AWD indicator stay on? YES - Go to the SH-AWD system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/differentials-drive-axles/#rear-differential) ) NO - Go to step 13.
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ) to make sure the gauge is known-good. If the function test is OK, go to step 14.
Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system) ). Are any B-CAN DTCs indicated? YES - Go to the indicated DTCs troubleshooting NO - Go to step 15.
Turn the ignition switch OFF.
Disconnect the HDS from the DLC.
Check for continuity between DLC terminal No. 7 and body ground. Is there 5 ohms or less? YES - Go to step 18. NO - Go to step 19 .
Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these parts, one at a time: SRS unit connector A (28P) VSA modulator-control unit 46P connector SH-AWD control unit connector A (26P) TPMS control unit connector B (20P) MICU connector P (30P) ACC unit 20P 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 DLC (K-line) and the VSA modulator-control unit, the SH-AWD control unit, the TPMS control unit, or the ACC unit
Connect DLC terminal No. 7 to body ground with a jumper wire.
Check for continuity between body ground and these connector terminals: CONNECTOR TERMINAL REFERENCE Connector Terminal SRS unit A (28P) No. 24 (RED) VSA modulator-control unit 46P No. 11 (LTBLU) SH-AWD control unit A (26P) No. 15(LTBLU) TPMS control unit B (20P) No. 9 (LTBLU) MICU 30P No. 6 (RED) ACC unit 20P No. 8 (RED) Is there continuity between the DLC terminal and each of the terminals in the chart? YES - Replace the unit that does not communicate with the HDS NO - Repair open in the wire between the DLC (K-line) and the appropriate connector
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rl/ii-2004-2008/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ) to make sure the gauge is known-good. If the function test is OK, go to step 22.
Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system) ). Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 35 . NO - Go to step 23.
Turn the ignition switch OFF.
Disconnect the HDS from the DLC.
Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 26. NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 Fl ECU (PCM) (15A) fuse in the under-hood fuse/relay box
Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 27. NO - Repair open in the wire between DLC terminal No. 4 and G501
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rl/ii-2004-2008/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 33. 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 «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) NO - Go to step 36.
Turn the ignition switch OFF.
Check the No. 23 +B IG MAIN (50A) fuse in the under-hood fuse box. Is the fuse OK? YES - Repair open in the wire between the No. 23 +B IG MAIN (50A) fuse and the ignition switch. If the wire is OK, go to step 38. NO - Repair short in the wire between the No. 23 +B IG MAIN (50A) fuse and the under-hood fuse box. Also replace the No. 23 +B IG MAIN (50A) fuse
Inspect the No. 23 IGP (7.5A) fuse in the driver's under-hood fuse/relay box. Is the fuse OK? YES - Go to step 44 . NO - Go to step 39.
Remove the blown No. 23 IGP (7.5A) fuse from the driver's under-hood 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 43. NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 23 IGP (7.5A) 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 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 «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 23 IGP (7.5A) 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 (7.5A) fuse in the driver's under-hood fuse/relay box
Inspect the No. 19 FUEL PUMP (20A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES - Go to step 51 . NO - Go to step 45.
Remove the blown No. 19 FUEL PUMP (20A) fuse in the driver's under-dash fuse/relay box.
Jump the SCS line with the HDS.
Disconnect PCM connector B (49P).
Check for continuity between PCM connector terminal D6 and body ground. Is there continuity? YES - Go to step 49. NO - Replace the No. 19 FUEL PUMP (20A) fuse in the driver's under-dash fuse/relay box, and update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) )
Remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
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 (20A) fuse and the PCM (D6), between the No. 19 FUEL PUMP (20A) fuse and PGM-FI main relay 2, or between the No. 21 METER (10A) fuse and the imoes unit. Also replace the No. 19 FUEL PUMP (20A) fuse in the driver's under-dash fuse/relay box NO - Go to step 51.
Jump the SCS line with the HDS.
Disconnect PCM connectors D (17P) and E (31P).
Turn the ignition switch ON (II).
Measure voltage between PCM connector terminal D6 and body ground. Is there battery voltage? YES - Go to step 55. NO - Repair open in the wire between the No. 19 FUEL PUMP (20A) fuse and the PCM (D6)
Measure voltage between PCM connector terminal E5 and body ground. Is there battery voltage? YES - Go to step 59 . NO - Go to step 56.
Turn the ignition switch OFF.
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 - Replace the driver's under-dash fuse/relay box. Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Repair open in the wire between the PCM (E5) and the driver's under-dash fuse/relay box
Turn the ignition switch OFF.
Disconnect the driver's under-dash fuse/relay box 39 P 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 62. 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-2004-2008/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES - Go to step 63. NO - Replace PGM-FI main relay 1.1
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 65. 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 67. NO - Go to step 68 .
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 69. NO - Go to step 70 .
Continue to check for continuity between PCM connector terminal C14 and body ground, while disconnecting these parts, one at a time: EGR valve 6P 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 71. NO - Go to step 72 .
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-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) )
Check for continuity between PCM connector terminal E12 and body ground. Is there continuity? YES - Go to step 73. NO - Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/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-2004-2008/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 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 (E12) and the APP sensor B or the FTP sensor

Scheme 204

Scheme 204: Injector Replacement

Scheme 205

Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/rl/ii-2004-2008/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Disconnect the connectors from the injectors (A).
Disconnect the quick-connect fitting (B), and remove the nut (C).
Remove the fuel rail mounting bolts (D) from the fuel rail (E).
Remove the injector clips (F) from the injectors.
Remove the injectors from the fuel rail.
Coat the new O-rings (A) with clean engine oil, and insert the injectors (B) into the fuel rail (C).
Install the injector clips (D).
Coat the injector O-rings (E) with clean engine oil.
Install the injectors in the injector base (F).
Install the fuel rail mounting nuts.
Connect the connectors on the injectors.
Connect the quick-connect fittings.
Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel rail will be pressurized. Repeat this two or three times, then check for fuel leakage.
Install the intake manifold (see «INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).

A/F Sensor Replacement

Special Tools Required

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

Scheme 206

Scheme 206: Front Bank (Bank 2)

Disconnect the front A/F sensor 8P connector (A), then remove the A/F sensor (B) with an 02 sensor socket wrench.
Install the parts in the reverse order of removal.

Scheme 207

Scheme 207: Rear Bank (Bank 1)

Disconnect the rear A/F sensor 8P connector (A), then remove the rear A/F sensor (B) with an 02 sensor socket wrench.
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 208

Scheme 208: Front Bank (Bank 2)

Disconnect the front secondary HO2S 4P connector (A), then remove the front secondary HO2S (B) with an 02 sensor socket wrench.
Install the parts in the reverse order of removal.

Scheme 209

Scheme 209: 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 210

Scheme 210: ECT Sensor 1 Replacement

Remove the engine cover (see step 1 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Remove the air cleaner (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system) ).
Disconnect the ECT sensor 1 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-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 211

Scheme 211: ECT Sensor 2 Replacement

Remove the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
Disconnect the ECT sensor 2 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-2004-2008/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 212

Scheme 212: 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-2004-2008/remont/mechanical/#cylinder-head) ).
Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
Remove the upper and lower timing belt covers from the engine (see «TIMING BELT REMOVAL»(/acura/rl/ii-2004-2008/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 «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Scheme 213

Scheme 213: Knock Sensor Replacement

Remove the intake manifold (see «REMOVAL»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Remove the fuel rails and the intake runner base.
Disconnect the knock sensor connector (A), then remove the knock sensor (B).
Install the parts in the reverse order of removal.

Scheme 214

Scheme 214: CMP Sensor Replacement

Scheme 215

Set the No. 1 piston at top dead center (see «TIMING BELT REMOVAL»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head) ).
Remove the upper covers from the engine (see step 10 under «TIMING BELT REMOVAL»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head) ).
To hold the timing belt adjuster in its current position, thread in the battery clamp bolt hand-tight (see step 14 under «TIMING BELT REMOVAL»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head) ).
Loosen the idler pulley bolt about five or six turns, then remove the timing belt from the front camshaft pulley (see step 16 under «TIMING BELT REMOVAL»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head) ).
Remove the front camshaft pulley (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. Reinstall the timing belt (see «TIMING BELT INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#cylinder-head__timing-belt-installation) ) and other removed parts.
Do the CKP pattern clear/CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Scheme 216

Scheme 216: IAT Sensor Replacement

Remove the engine cover (see step 1 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
Disconnect the IAT sensor connector (A).
Remove the IAT sensor (B).
Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 217

Scheme 217: MAP Sensor Replacement

Remove the engine cover (see step 1 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#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).

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
GIMA-600 and an iN workstation with HDS and CM update software

Note. Make sure the HDS is loaded with 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 218

Scheme 219

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Turn the ignition switch ON (II).
Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) . If you are returning from DLC circuit troubleshooting, skip steps 4 through 9 , 16 through 18 , 21 , and 22 , then do this after replacing the PCM: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/rl/ii-2004-2008/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rl/ii-2004-2008/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ). Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#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 READ DATA indicates FAILED, continue with this procedure.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Remove the panels (A) (see step 5 under «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#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.
Turn the ignition switch 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 20 . Otherwise, go to step 18.
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-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 23.
If the READ DATA failed in step 7 or the WRITE DATA failed in step 19 , replace the engine oil (see «OIL PRESSURE TEST»(/acura/rl/ii-2004-2008/remont/lubrication-system/#engine-lubrication__oil-pressure-test) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rl/ii-2004-2008/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 24.
Select PGM-FI system, and reset the PCM with the HDS.
Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Pgm-Fi System Acura RL II

Scheme 1

Scheme 2

DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 3

Scheme 4

Scheme 5

DTC P0108: MAP Sensor Circuit High Voltage

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

DTC P0111: IAT Sensor Circuit Range/Performance Problem

DTC P0112: IAT Sensor Circuit Low Voltage

Scheme 11

DTC P0113: IAT Sensor Circuit High Voltage

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem

DTC P0117: ECT Sensor 1 Circuit Low Voltage

Scheme 17

DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

DTC P0128: Cooling System Malfunction

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

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

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Scheme 32

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 33

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

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Scheme 36

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

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Scheme 45

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 46

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

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Scheme 57

DTC P0325: Knock Sensor Circuit Malfunction

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