Electronic Throttle Control System — Acura RL II (2004-2008)

Scheme 12

Scheme 12: Component Location Index

Scheme 13

DTC P0122: TP Sensor A 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 14

Scheme 14: DTC P0122: TP Sensor A Circuit Low Voltage

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Scheme 16

Scheme 17

Scheme 18

Scheme 19

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR A in the DATA LIST with the HDS. Is there about 0.3 V or less? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
Check for Temporary DTCs or DTCs with the HDS. Are DTC P0122 and P0222 indicated at the same time? YES - Check for, and repair any poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM, then go to step 21 . If the connections and terminals are OK, go to step 11 . NO - Go to step 5.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Check for continuity between throttle body 6P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the throttle body and the C251 connector (TPSA line), then go to step 17 . NO - Go to step 9.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between C251 connector (13P) terminal No. 4 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector (TPSA line), then go to step 21 . NO - Go to step 26 .
Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 19 . NO - Go to step 12.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between C251 connector (13P) terminal No. 3 and body ground. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (VCC line), then go to step 21 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 11 and C251 connector (13P) terminal No. 3. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the throttle actuator control module (VCC line) and the C251 connector, then go to step 21 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P0123: TP Sensor A Circuit High Voltage

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

Scheme 20

Scheme 20: DTC P0123: TP Sensor A Circuit High Voltage

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES - Go to step 12 . NO - Go to step 5.
Measure voltage between throttle body 6P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 19 . NO - Go to step 6.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 1 to body ground with a jumper wire. 10. Check for continuity between C251 connector (13P) terminal No. 4 and body ground. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the throttle body and the C251 connector (TPSA line), then go to step 21 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 10 and C251 connector (13P) terminal No. 4. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector (TPSA line), then go to step 21 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between C251 connector (13P) terminal No. 5 and body ground. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the throttle body and the C251 connector (SG line), then go to step 21 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 9 and C251 connector (13P) terminal No. 5. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the throttle actuator control module (SG line) and the C251 connector, then go to step 21 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P0222: TP Sensor B 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 27

Scheme 27: DTC P0222: TP Sensor B Circuit Low Voltage

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Scheme 29

Scheme 30

Scheme 31

Scheme 32

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR A in the DATA LIST with the HDS. Is there about 0.3 V or less? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
Check for Temporary DTCs or DTCs with the HDS. Are DTC P0122 and P0222 indicated at the same time? YES - Check for, and repair any poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM, then go to step 21 . If the connections and terminals are OK, go to step 11 . NO - Go to step 5.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Check for continuity between throttle body 6P connector terminal No. 3 and body ground. Is there continuity? YES - Repair short in the wire between the throttle body and the C251 connector (TPSB line), then go to step 21 . NO - Go to step 9.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between C251 connector (13P) terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector (TPSB line), then go to step 21 . NO - Go to step 26 .
Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 19 . NO - Go to step 12.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between C251 connector (13P) terminal No. 3 and body ground. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (VCC line), then go to step 21 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 11 and C251 connector (13P) terminal No. 3. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the throttle actuator control module (VCC line) and the C251 connector, then go to step 21 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P0223: TP Sensor B 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 33

Scheme 33: DTC P0223: TP Sensor B Circuit High Voltage

Scheme 34

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Scheme 36

Scheme 37

Scheme 38

Scheme 39

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES - Go to step 13 . NO - Go to step 5.
Measure voltage between throttle body 6P connector terminal No. 3 and body ground. Is there about 5 V? YES - Go to step 20 . NO - Go to step 6.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 3 to body ground with a jumper wire.
Check for continuity between C251 connector (13P) terminal No. 2 and body ground. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the throttle body and the C251 connector (TPSB line), then go to step 22 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 12 and C251 connector (13P) terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector (TPSB line), then go to step 22 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between C251 connector (13P) terminal No. 5 and body ground. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the throttle body and the C251 connector (SG line), then go to step 22 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 9 and C251 connector (13P) terminal No. 5. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the throttle actuator control module (SG line) and the C251 connector, then go to step 22 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0223 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P0223 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P1683: Throttle Valve Default Position Spring Performance Problem

CAUTION

Do not insert your fingers into the installed throttle body when you turn the ignition switch ON (II) or while the ignition switch is ON (II). If you do, you will seriously injure your fingers if the throttle valve is activated.

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

Scheme 40

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.
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1683 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 throttle body and the throttle actuator control module.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Push the throttle valve closed as shown. NOTE: Do not operate the ignition switch during the check. Be careful not to pinch your fingers during the check.
Release the throttle valve. Does the throttle valve return? YES - 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 13 . NO - Go to step 11.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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) ).
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1683 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P1684: Throttle Valve Return Spring Performance Problem

CAUTION

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

Scheme 41

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.
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1684 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 throttle body and the throttle actuator control module.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Push the throttle valve open as shown. NOTE: Do not operate the ignition switch during the check. Be careful not to pinch your fingers during the check.
Release the throttle valve. Does the throttle valve return? YES - 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 13 . NO - Go to step 11.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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) ).
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P1684 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P2101: Throttle Actuator 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 ).

Scheme 42

Scheme 42: DTC P2101: Throttle Actuator System Malfunction

Scheme 43

Scheme 44

Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 indicated? YES - Go to step 6 . NO - Go to step 4.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS APP SENSOR
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 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 throttle body and the throttle actuator control module, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Visually check the throttle valve operation, NOTE: Be careful not to pinch your fingers during the check. Does the throttle valve operate smoothly? YES - 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 21 and recheck. If DTC P2101 is indicated, go to step 19 . NO - Go to step 12.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
Check for continuity between C251 connector (13P) terminals No. 6 and No. 13. Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the throttle body and the C251 connector (motor drive lines), then go to step 21 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminals No. 1 and No. 8 and C251 connector (13P) terminals No. 6 and No. 13 individually. Is there continuity? YES - Go to step 27 . NO - Repair open in the wires between the throttle actuator control module and the C251 connector (motor drive lines), then go to step 21 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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) ).
Test-drive the vehicle for several minutes in the range of the recorded freeze data.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), and 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 P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P2108: Throttle Actuator Control Module 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).
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2108 indicated? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), and recheck. If DTC P2108 is not indicated, replace the original throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ). NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM.

DTC P2118: Throttle Actuator Current 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 ).

Scheme 45

Scheme 45: DTC P2118: Throttle Actuator Current Range/Performance Problem

Scheme 46

Scheme 47

Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Measure resistance between C251 connector (13P) terminals No. 6 and No. 13. Is there about 1.0 or less? YES - Go to step 3. NO - Go to step 5 .
Disconnect the throttle body 6P connector.
Measure resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed. Is there about 1.0 or less? YES - Go to step 7 . NO - Repair short in the wires between the throttle body and the C251 connector (motor drive lines), then go to step 8 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between body ground and C251 connector (13P) terminals No. 6 and No. 13 individually. Is there continuity? YES - Repair short in the wires between the throttle actuator control module and the C251 connector (motor drive lines), then go to step 8 . NO - Go to step 16 .
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II).
Slowly press the accelerator pedal to the floor.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P2122: APP Sensor A (Throttle Position Sensor D) 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 48

Scheme 48: DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Turn the ignition switch ON (II).
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0.1 V or less? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3. Is there about 5 V? YES - Go to step 7. NO - Go to step 17 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector D(17P).
Check for continuity between APP sensor 6P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between APP sensor A and the PCM (D3), then go to step 20 . NO - Go to step 11.
Connect PCM connector terminal D3 to body ground with a jumper wire.
Check for continuity between APP sensor 6P connector terminal No. 1 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between APP sensor A and the PCM (D3), then go to step 20 .
Reconnect PCM connector D (17P).
Connect APP sensor 6P connector terminals No. 1 and No. 3 with a jumper wire.
Turn the ignition switch ON (II).
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0.1 V or less? YES - Go to step 25 . NO - Go to step 18 .
Measure voltage between PCM connector terminals D2 and D7. Is there about 5 V? YES - Repair open in the wire between the PCM (D22) and APP sensor A, then go to step 20 . NO - Go to step 25 .
Turn the ignition switch OFF.
Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-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 P2122 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2122 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2123: APP Sensor A (Throttle Position Sensor D) 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 54

Scheme 54: DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage

Scheme 55

Turn the ignition switch ON (II).
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 4.9 V or more? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3. Is there about 5 V? YES - Go to step 8 . NO - Go to step 7.
Measure voltage between PCM connector terminals D2 and D7. Is there about 5 V? YES - Repair short in the wire between the PCM (D7) and APP sensor A, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch OFF.
Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the 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 P2123 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2123 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2127: APP Sensor B (Throttle Position Sensor E) 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 56

Scheme 56: DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Turn the ignition switch ON (II).
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0.1 V or less? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor Band the PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6. Is there about 5 V? YES - Go to step 7. NO - Go to step 17 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector D(17P).
Check for continuity between APP sensor 6P connector terminal No. 4 and body ground. Is there continuity? YES - Repair short in the wire between APP sensor B and the PCM (D9), then go to step 20 . NO - Go to step 11.
Connect PCM connector terminal D9 to body ground with a jumper wire.
Check for continuity between APP sensor 6P connector terminal No. 4 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between APP sensor B and the PCM (D9), then go to step 20 .
Reconnect PCM connector D (17P).
Connect APP sensor 6P connector terminals No. 4 and No. 6 with a jumper wire.
Turn the ignition switch ON (II).
Check APP SENSOR B in the DATA LIST with the HDS. Is there about 0.1 V or less? YES - Go to step 25 . NO - Go to step 18 .
Measure voltage between PCM connector terminals E1 and E12. Is there about 5 V? YES - Repair open in the wire between the PCM (E12) and APP sensor B, then go to step 20 . NO - Go to step 25 .
Turn the ignition switch OFF.
Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-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 P2127 indicated? YES - Check for poor connections or loose terminals at APP sensor 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 P2127 indicated? YES - Check for poor connections or loose terminals at APP sensor 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 P2128: APP Sensor B (Throttle Position Sensor E) 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 62

Scheme 62: DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage

Scheme 63

Turn the ignition switch ON (II).
Check APP SENSOR B in the DATA LIST with the HDS. Is there about 4.9 V or more? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor Band the PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6. Is there about 5 V? YES - Go to step 8 . NO - Go to step 7.
Measure voltage between PCM connector terminals E1 and E12. Is there about 5 V? YES - Repair open in the wire between the PCM (E1) and APP sensor B, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch ON (II).
Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-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 P2128 indicated? YES - Check for poor connections or loose terminals at APP sensor 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.
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 P2128 indicated? YES - Check for poor connections or loose terminals at APP sensor 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 P2135: TP Sensor A/B Voltage Incorrect Correlation

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

Scheme 64

Scheme 64: DTC P2135: TP Sensor A/B Voltage Incorrect Correlation

Scheme 65

Scheme 66

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2135 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 throttle body and the throttle actuator control module.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Visually check the throttle valve operation. Does the valve move to the fully closed position temporarily? YES - Go to step 17 . NO - Go to step 10.
Turn the ignition switch OFF.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Check for continuity between C251 connector (13P) terminals No. 2 and No. 4. Is there continuity? YES - Go to step 13. NO - Go to step 15 .
Disconnect the throttle body 6P connector.
Check for continuity between C251 connector (13P) terminals No. 2 and No. 4. Is there continuity? YES - Repair short in the wire between the TPSA line and the TPSB line, then go to step 19 . NO - Go to step 17 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between C251 connector (13P) terminals No. 2 and No. 4. Is there continuity? YES - Repair short in the wire between the TPSA line and the TPSB line of the throttle actuator control module subharness, then go to step 19 . NO - Go to step 24 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, 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 P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P2138: APP Sensor A/B Incorrect Voltage Correlation

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

Scheme 67

Scheme 67: DTC P2138: APP Sensor A/B Incorrect Voltage Correlation

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Press the accelerator pedal to the floor.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 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 APP sensor and the PCM.
Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS. Are they the same voltage? YES - Go to step 6. NO - Go to step 11 .
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 terminals D3 and D9. Is there continuity? YES - Repair short in the wires between the PCM terminals (D3, D9), then go to step 13 . NO - Go to step 21 .
Turn the ignition switch OFF.
Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-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) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II).
Press the accelerator pedal to the floor.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at the APP 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) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II).
Press the accelerator pedal to the floor.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at the APP 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 P2176: Throttle Actuator Control System Idle Position Not Learned

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 P2135 or P2552 is stored at the same time as DTC P2176, troubleshoot DTC P2135 or P2552 first, then recheck for DTC P2176.

Scheme 68

Scheme 68: DTC P2176: Throttle Actuator Control System Idle Position Not Learned

Scheme 69

Scheme 70

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2176 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 throttle body and the throttle actuator control module, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Visually check the throttle valve operation. NOTE: Be careful not to pinch your fingers. Keep your hands away from the throttle valve. Does the throttle valve move to its fully closed position? YES - Go to step 12. NO - Go to step 13 .
Check for sludge or carbon on the throttle valve. Is there sludge or carbon on the throttle valve? YES - 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 and recheck. NO - Go to step 20 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
Check for continuity between C251 connector (13P) terminals No. 6 and No. 13. Is there continuity? YES - Go to step 18. NO - Repair open in the wires between the throttle body and the C251 connector (motor drive lines), then go to step 22 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminals No. 1 and No. 8 and C251 connector (13P) terminals No. 6 and No. 13 individually. Is there continuity? YES - Go to step 29 . NO - Repair open in the wires between the throttle actuator control module and the C251 connector (motor drive lines), then go to step 22 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2176 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/rl/ii-2004-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), and 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 P2176 indicated? YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. 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 P2552: Throttle Actuator Control Module Relay 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 71

Scheme 71: DTC P2552: Throttle Actuator Control Module Relay Malfunction

Scheme 72

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the RELAY circuit OK? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the PCM. NO - Go to step 4.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Remove the throttle actuator control module relay (A).
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E3 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module relay and the PCM (E3), then go to step 10 . NO - Go to step 9.
Test the throttle actuator control module relay (see «POWER RELAY TEST»(/acura/rl/ii-2004-2008/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 17 . NO - Replace the throttle actuator control module relay, then go to step 10.
Reconnect PCM connector E (31P).
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) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2552 indicated? YES - Check for poor connections or loose terminals at the throttle actuator control module, the throttle actuator control module relay, 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 P2552 indicated? YES - Check for poor connections or loose terminals at the throttle actuator control module, the throttle actuator control module relay, 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 U0107: Lost Communication With Throttle Actuator Control Module

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

Scheme 73

Scheme 73: DTC U0107: Lost Communication With Throttle Actuator Control Module

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Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0107 indicated? YES - Check for, and repair any poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM, then go to step 62 . If the connections and terminals are OK, go to step 6 . NO - Go to step 4.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0107 indicated? YES - Go to step 48 . NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the PCM.
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Press the accelerator pedal to the floor.
Turn the ignition switch ON (II).
Check the throttle valve operation. Does the throttle valve open after it closes? YES - Go to step 12. NO - Go to step 13 .
Check the throttle valve again. Does the throttle valve open fully? YES - Go to step 42 . NO - Go to step 36 .
Turn the ignition switch OFF.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Check for continuity between C251 connector (13P) terminal No. 7 and body ground. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the C251 connector and G101, then go to step 63 .
Remove the throttle actuator control module relay (A).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 and body ground. Is there battery voltage? YES - Go to step 19 . NO - Go to step 18.
Check the No. 1 THROTTLE ACTUATOR CONTROL (15A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES - Repair open in the wire between the throttle actuator control module relay (+B line) and the No. 1 THROTTLE ACTUATOR CONTROL (15A) fuse, then go to step 63 . NO - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 1 THROTTLE ACTUATOR CONTROL (15A) fuse, then go to step 63 .
Install the throttle actuator control module relay.
Turn the ignition switch ON (II).
Measure voltage between C251 connector (13P) terminal No. 12 and body ground. Is there battery voltage for about 2 seconds? YES - Go to step 52 . NO - Go to step 22.
Turn the ignition switch OFF.
Remove the throttle actuator control module relay (A).
Check the throttle actuator control module relay (see «POWER RELAY TEST»(/acura/rl/ii-2004-2008/remont/body-electrical/#relays__power-relay-test) ). Is the throttle actuator control module relay OK? YES - Go to step 25. NO - Replace the throttle actuator control module relay, then go to step 63 .
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 27. NO - Repair open in the wire between the throttle actuator control module relay and PGM-FI main relay 1 (Fl MAIN), then go to step 62 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E3 and throttle actuator control module relay 4P connector terminal No. 1. Is there continuity? YES - Go to step 31. NO - Repair open in the wire between the PCM (E3) and the throttle actuator control module relay, then go to step 63 .
Check for continuity between C251 connector (13P) terminal No. 12 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step 63 . NO - Go to step 32.
Check for continuity between throttle actuator control module relay 4P connector terminal No. 3 and C251 connector (13P) terminal No. 12. Is there continuity? YES - Go to step 33. NO - Repair open in the wire between the throttle actuator control module relay and the C251 connector (+B line), then go to step 63 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between C251 connector (13P) terminal No. 12 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63 . NO - Go to step 35.
Check for continuity between throttle actuator control module 16P connector terminal No. 2 and C251 connector (13P) terminal No. 12. Is there continuity? YES - Go to step 68 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Disconnect PCM connector A (31P).
Check for continuity between PCM connector terminals A25 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A25) and the C251 connector, then go to step 63 . NO - Go to step 41.
Check for continuity between PCM connector terminal A25 and C251 connector (13P) terminal No. 11. Is there continuity? YES - Go to step 56 . NO - Repair open in the wire between the PCM (A25) and the C251 connector, then go to step 63 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
Disconnect PCM connector A (31P).
Check for continuity between PCM connector terminal A26 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A26) and the C251 connector, then go to step 63 . NO - Go to step 47.
Check for continuity between PCM connector terminal A26 and C251 connector (13P) terminal No. 1. Is there continuity? YES - Go to step 59 . NO - Repair open in the wire between the PCM (A26) and the C251 connector, then go to step 63 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connectors A (31P) and B (24P).
Check for continuity between body ground and PCM connector terminals A3 and B15 individually. Is there continuity? YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the PCM, then go to step 1 . NO - Repair open in the wire between the PCM (A3, B15) and G101, then go to step 63 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between throttle actuator control module 16P connector terminal No. 7 and C251 connector (13P) terminal No. 7. Is there continuity? YES - Go to step 54. NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63 .
Check for continuity between C251 connector (13P) terminal No. 12 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63 . NO - Go to step 55.
Check for continuity between throttle actuator control module 16P connector terminal No. 2 and C251 connector (13P) terminal No. 12. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between C251 connector (13P) terminals No. 11 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63 . NO - Go to step 58.
Check for continuity between throttle actuator control module 16P connector terminal No. 6 and C251 connector (13P) terminal No. 11. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63 .
Disconnect the throttle actuator control module 16P connector (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ).
Check for continuity between C251 connector (13P) terminals No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63 . NO - Go to step 61.
Check for continuity between throttle actuator control module 16P connector terminal No. 14 and C251 connector (13P) terminal No. 1. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 63 . NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63 .
Turn the ignition switch OFF.
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 U0107 indicated? YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, 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 U0107 indicated? YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, 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.

APP Sensor Signal Inspection

Note. This procedure checks the APP sensor in its fully closed position. In any other position, the APP sensor stores DTCs which are covered in other troubleshooting procedures. Check for Temporary DTCs or DTCs with the HDS before doing this procedure. If any DTCs are indicated, troubleshoot them first, then do this procedure. Press the accelerator pedal several times to check its operation. If it does not operate properly, check the pedal. If you find a problem, replace the accelerator pedal module (see ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION ).

Scheme 96

Scheme 96: APP Sensor Signal Inspection

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 does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system) ).
Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0 %, the APP sensor is OK. If it is not 0 %, update the PCM if it does not have the latest software, 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 go to step 5.
Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0 %, the APP sensor is OK. If it is not 0 %, replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 97

Scheme 97: Accelerator Pedal Module Removal/Installation

Disconnect the APP sensor connector (A).
Release the lock tab on the base of the accelerator pedal, then remove the accelerator pedal module (B).
Install the parts in the reverse order of removal.

Scheme 98

Scheme 98: Throttle Actuator Control Module Replacement

Scheme 99

Remove the right 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) ).
Remove the glove box (see «GLOVE BOX REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard__glove-box-removalinstallation) ).
Remove the HandsFreeLink control unit (see «CONTROL UNIT INPUT TEST»(/acura/rl/ii-2004-2008/remont/entertainment-systems/#handsfreelink-system) ) and the adaptive cruise control (ACC) unit and its bracket (if equipped) (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/cruise-control-systems/#adaptive-cruise-control-system) ).
Disconnect the throttle actuator control module 16P connector (A).
Remove the nuts (B) and the throttle actuator control module (C).
Install the parts in the reverse order of removal.

Electronic Throttle Control System Acura RL II

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DTC P0122: TP Sensor A Circuit Low Voltage

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DTC P0123: TP Sensor A Circuit High Voltage

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DTC P0222: TP Sensor B Circuit Low Voltage

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DTC P0223: TP Sensor B Circuit High Voltage

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DTC P1683: Throttle Valve Default Position Spring Performance Problem

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DTC P1684: Throttle Valve Return Spring Performance Problem

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DTC P2101: Throttle Actuator System Malfunction

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DTC P2108: Throttle Actuator Control Module Problem

DTC P2118: Throttle Actuator Current Range/Performance Problem

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DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage

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DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage

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DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage

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DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage

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DTC P2135: TP Sensor A/B Voltage Incorrect Correlation

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DTC P2138: APP Sensor A/B Incorrect Voltage Correlation

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DTC P2176: Throttle Actuator Control System Idle Position Not Learned

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DTC P2552: Throttle Actuator Control Module Relay Malfunction

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DTC U0107: Lost Communication With Throttle Actuator Control Module