Electronic Throttle Control System — Acura TL III (2003-2006)

Scheme 350

Scheme 350: Component Location Index

DTC Troubleshooting

DTC	Description
DTC P0122	TP Sensor A Circuit Low Voltage
DTC P0123	TP Sensor A Circuit High Voltage
DTC P0222	TP Sensor B Circuit Low Voltage
DTC P0223	TP Sensor B Circuit High Voltage
DTC P1683	Throttle Valve Default Position Spring Performance Problem
DTC P1684	Throttle Valve Return Spring Performance Problem
DTC P2101	Throttle Actuator System Malfunction
DTC P2108	Throttle Actuator Control Module Problem
DTC P2118	Throttle Actuator Current Circuit Range/Performance Problem
DTC P2122	APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2004-2005 models)
DTC P2122	APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2006 model)
DTC P2123	APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2004-2005 models)
DTC P2123	APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2006 model)
DTC P2127	APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2004-2005 models)
DTC P2127	APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2006 model)
DTC P2128	APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2004-2005 models)
DTC P2128	APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2006 model)
DTC P2135	TP Sensor A/B Voltage Incorrect Correlation
DTC P2138	APP Sensor A/B (Throttle Position Sensor D/E) Incorrect Voltage Correlation
DTC P2176	Throttle Actuator Control System Idle Position Not Learned
DTC P2552	Throttle Actuator Control Module Relay Malfunction (2004-2005 models)
DTC P2552	Throttle Actuator Control Module Relay Malfunction (2006 model)
DTC U0107	Lost Communication With Throttle Actuator Control Module (2004-2005 models)
DTC U0107	Lost Communication With Throttle Actuator Control Module (2006 model)

DTC TROUBLESHOOTING INDEX

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 351

Scheme 351: DTC P0122: TP Sensor A Circuit Low Voltage

Scheme 352

Scheme 353

Scheme 354

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, 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 poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM/PCM, then go to step 17 . If the connections are OK, go to step 9 . NO - Go to step 5 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
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 throttle actuator control module (TPSA line), then go to step 17 . NO - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 and recheck. If DTC P0122 is not indicated, replace the original throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 . If DTC P0122 is indicated, go to step 15 .
Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 15 . NO - Go to step 10 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Disconnect the throttle body 6P connector.
Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 11 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 and recheck. If DTC P0122 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 If DTC P0122 is indicated, go to step 15 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (VCC line), then go to step 17 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0122 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 355

Scheme 355: DTC P0123: TP Sensor A Circuit High Voltage

Scheme 356

Scheme 357

Scheme 358

Scheme 359

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, 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 11 . 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 16 . NO - Go to step 6 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Disconnect the throttle body 6P connector.
Connect throttle body 6P connector terminal No. 1 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 10 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 and recheck. If DTC P0123 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 . If DTC P0123 is indicated, go to step 16 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (TPSA line), then go to step 18 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 9 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 and recheck. If DTC P0123 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 . If DTC P0123 is indicated, go to step 16 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (SG line), then go to step 18 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0123 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 360

Scheme 360: DTC P0222: TP Sensor B Circuit Low Voltage

Scheme 361

Scheme 362

Scheme 363

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR B in the DATA LIST with the HDS. Is there about 0.3 V or less? YES - Go to step 4 . NO - Intermittent failure, 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 poor connections or loose terminals at the throttle body, the throttle actuator control module, and at the ECM/PCM, then go to step 17 . If the connections are OK, go to step 9 . NO - Go to step 5 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
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 throttle actuator control module (TPSB line), then go to step 17 NO - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 and recheck. If DTC P0222 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 . If DTC P0222 is indicated, go to step 15 .
Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 15 . NO - Go to step 10 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Disconnect the throttle body 6P connector.
Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 11 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 and recheck. If DTC P0222 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 If DTC P0222 is indicated, go to step 15 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (VCC line), then go to step 17
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0222 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 364

Scheme 364: DTC P0223: TP Sensor B Circuit High Voltage

Scheme 365

Scheme 366

Scheme 367

Scheme 368

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check TP SENSOR B in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to step 4 . NO - Intermittent failure, 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 11 . 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 16 . NO - Go to step 6 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Disconnect the throttle body 6P connector.
Connect throttle body 6P connector terminal No. 3 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 12 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 and recheck. If DTC P0223 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 20 . If DTC P0223 is indicated, go to step 16 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (TPSB line), then go to step 20 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 9 and body ground. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 and recheck. If DTC P0223 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 18 . If DTC P0223 is indicated, go to step 16 . NO - Repair open in the wire between the throttle body and the throttle actuator control module (SG line), then go to step 18 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0223 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 369

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, 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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 12 . NO - Go to step 11 .
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1683 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 370

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, 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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 12 . NO - Go to step 11 .
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1684 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P2101: Throttle Actuator System Malfunction

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 371

Scheme 372

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 Vehicle speed Accelerator position
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 indicated? YES - Go to step 6 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and at the throttle actuator control module, then clean the throttle body (see «THROTTLE BODY TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ).
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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 20 and recheck. If DTC P2101 is indicated, go to step 17 . NO - Go to step 12 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminals No. 1 and No. 8. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 20 and recheck. If DTC P2101 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 20 If DTC P2101 is indicated, go to step 17 . NO - Repair open in the wires between the throttle body and the throttle actuator control module (motor drive lines), then go to step 20 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2101 is indicated, 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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), and go to step 1 If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), and recheck. If DTC P2108 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ). NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM/PCM.

DTC P2118: Throttle Actuator Current 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 ).

Scheme 373

Scheme 373: DTC P2118: Throttle Actuator Current Circuit Range/Performance Problem

Scheme 374

Disconnect the throttle actuator control module 16P connector.
Measure resistance between throttle actuator control module 16P connector terminals No. 1 and No. 8 Is there about 1.0ohm or less? YES - Go to step 3 . NO - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 7 and recheck. If DTC P2118 is not indicated, (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 7 .
Disconnect the throttle body 6P connector.
At the throttle body side, measure resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed. Is there about 1.0 ohm or less? YES - Go to step 5 . NO - Repair short in the wires between the throttle body and the throttle actuator control module (motor drive lines), then go to step 6 .
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect the throttle body 6P connector.
Reconnect the throttle actuator control module 16P connector.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2118 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2004-2005 Models)

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

Scheme 375

Scheme 375: DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2004-2005 Models)

Scheme 376

Scheme 377

Scheme 378

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Scheme 380

Scheme 381

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, 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 15 .
Turn the ignition switch OFF.
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 4 and No. 6 with the throttle fully closed. Is there about 0.35-0.45 kohm at room temperature? YES - Go to step 9 . NO - Go to step 16 .
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 4 and No. 5 with the throttle fully closed. Is there about 2.7-3.3 kohm at room temperature? YES - Go to step 10 . NO - Go to step 16 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector D (17P).
At the wire harness side, 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 A and the ECM/PCM (D3), then go to step 17 . NO - Go to step 13 .
Connect ECM/PCM connector terminal D3 to body ground with a jumper wire.
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 4 and body ground. Is there continuity? YES - Go to step 22 . NO - Repair open in the wire between APP sensor A and the ECM/PCM (D3), then go to step 17 .
Measure voltage between ECM/PCM connector terminals D2 and D15. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D2) and APP sensor A, then go to step 17 . NO - Go to step 22 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2122 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2122 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2006 Model)

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

Scheme 382

Scheme 382: DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2006 Model)

Scheme 383

Scheme 384

Scheme 385

Scheme 386

Scheme 387

Scheme 388

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, 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 15 .
Turn the ignition switch OFF.
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 4 and No. 6 with the throttle fully closed. Is there about 0.35-0.45 kohm at room temperature? YES - Go to step 9 . NO - Go to step 16 .
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 4 and No. 5 with the throttle fully closed. Is there about 2.7-3.3 kohm at room temperature? YES - Go to step 10 . NO - Go to step 16 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector D (17P).
At the wire harness side, 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 A and the ECM/PCM (D3), then go to step 17 . NO - Go to step 13 .
Connect ECM/PCM connector terminal D3 to body ground with a jumper wire.
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 4 and body ground. Is there continuity? YES - Go to step 22 . NO - Repair open in the wire between APP sensor A and the ECM/PCM (D3), then go to step 17 .
Measure voltage between ECM/PCM connector terminals D2 and D7. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D2) and APP sensor A, then go to step 17 . NO - Go to step 22 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2122 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2122 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2004-2005 Models)

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

Scheme 389

Scheme 389: DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2004-2005 Models)

Scheme 390

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, 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 ECM/PCM connector terminals D2 and D15. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D15) and APP sensor A, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2006 Model)

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

Scheme 391

Scheme 391: DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2006 Model)

Scheme 392

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, 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 ECM/PCM connector terminals D2 and D7. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D7) and APP sensor A, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs Indicated? YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2004-2005 Models)

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

Scheme 393

Scheme 393: DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2004-2005 Models)

Scheme 394

Scheme 395

Scheme 396

Scheme 397

Scheme 398

Scheme 399

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 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 1 and No. 2. Is there about 5 V? YES - Go to step 7 . NO - Go to step 15 .
Turn the ignition switch OFF.
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 2 and No. 3 with the throttle fully closed. Is there about 0.35-0.45 kohm at room temperature? YES - Go to step 9 . NO - Go to step 16 .
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 1 and No. 3 with the throttle fully closed. Is there about 5.9-7.3 kohm at room temperature? YES - Go to step 10 . NO - Go to step 16 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector D (17P).
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. Is there continuity? YES - Repair short in the wire between APP sensor B and the ECM/PCM (D9), then go to step 17 . NO - Go to step 13 .
Connect ECM/PCM connector terminal D9 to body ground with a jumper wire.
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. Is there continuity? YES - Go to step 22 . NO - Repair open in the wire between APP sensor B and the ECM/PCM (D9), then go to step 17 .
Measure voltage between ECM/PCM connector terminals D10 and D12. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D12) and APP sensor B, then go to step 17 . NO - Go to step 22 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2006 Model)

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

Scheme 400

Scheme 400: DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2006 Model)

Scheme 401

Scheme 402

Scheme 403

Scheme 404

Scheme 405

Scheme 406

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 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 1 and No. 2. Is there about 5 V? YES - Go to step 7 . NO - Go to step 15 .
Turn the ignition switch OFF.
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 2 and No. 3 with the throttle fully closed. Is there about 0.35-0.45 kohm at room temperature? YES - Go to step 9 . NO - Go to step 16 .
At the sensor side, measure resistance between APP sensor 6P connector terminals No. 1 and No. 3 with the throttle fully closed. Is there about 5.9-7.3 kohm at room temperature? YES - Go to step 10 . NO - Go to step 16 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector D (17P).
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. Is there continuity? YES - Repair short in the wire between APP sensor B and the ECM/PCM (D9), then go to step 17 . NO - Go to step 13 .
Connect ECM/PCM connector terminal D9 to body ground with a jumper wire.
At the wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. Is there continuity? YES - Go to step 22 . NO - Repair open in the wire between APP sensor B and the ECM/PCM (D9), then go to step 17 .
Measure voltage between ECM/PCM connector terminals C12 and C14. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (C14) and APP sensor B, then go to step 17 . NO - Go to step 22 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs Indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2004-2005 Models)

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

Scheme 407

Scheme 407: DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2004-2005 Models)

Scheme 408

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 1 and No. 2 Is there about 5 V? YES - Go to step 8 . NO - Go to step 7 .
Measure voltage between ECM/PCM connector terminals D10 and D12. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (D10) and APP sensor B, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2006 Model)

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

Scheme 409

Scheme 409: DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2006 Model)

Scheme 410

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the APP sensor 6P connector.
Turn the ignition switch ON (II).
At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 1 and No. 2. Is there about 5 V? YES - Go to step 8 . NO - Go to step 7 .
Measure voltage between ECM/PCM connector terminals C12 and C14. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (C12) and APP sensor B, then go to step 10 . NO - Go to step 14 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2135: TP Sensor A/B Voltage Incorrect Correlation

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 411

Scheme 412

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, 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 15 . NO - Go to step 10 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminals No. 10 and No. 12. Is there continuity? YES - Go to step 13 . NO - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 and recheck. If DTC P2135 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 17 .
Disconnect the throttle body 6P connector.
Check for continuity between throttle actuator control module 16P connector terminals No. 10 and No. 12. Is there continuity? YES - Repair short in the wire between the TPSA line and the TPSB line, then go to step 17 . NO - Go to step 15 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2135 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P2138: APP Sensor A/B (Throttle Position Sensor D/E) 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 413

Scheme 413: DTC P2138: APP Sensor A/B (Throttle Position Sensor D/E) Incorrect Voltage Correlation

Turn the ignition switch ON (II).
Clear the DTC with 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, system is OK at this time. Check for poor connections or loose terminals at the APP sensor and the ECM/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 ECM/PCM connector D (17P).
Check for continuity between ECM/PCM connector terminals D3 and D9. Is there continuity? YES - Repair short in the wires between the ECM/PCM terminals (D3, D9), then go to step 13 . NO - Go to step 21 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2176: Throttle Actuator Control System Idle Position Not Learned

CAUTION

Note. If DTC P2135 is stored at the same time as DTC P2176, troubleshoot DTC P2135 first, then recheck for DTC P2176. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 414

Scheme 415

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, 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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ).
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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 21 and recheck. NO - Go to step 18 .
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Disconnect the throttle actuator control module 16P connector.
Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminals No. 1 and No. 8 Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 20 and recheck. If DTC P2176 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 20 . NO - Repair open in the wires between the throttle body and the throttle actuator control module (motor drive lines), then go to step 20 .
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2176 is indicated, 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 TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), and go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P2552: Throttle Actuator Control Module Relay Malfunction (2004-2005 Models)

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

Scheme 416

Scheme 416: DTC P2552: Throttle Actuator Control Module Relay Malfunction (2004-2005 Models)

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, 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 ECM/ 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 ECM/PCM connector A (31P).
Check for continuity between ECM/PCM connector terminal A3 and body ground. Is there continuity? YES - Repair short in the wire between the throttle actuator control module relay and the ECM/PCM (A3), then go to step 10 . NO - Go to step 9 .
Test the throttle actuator control module relay (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/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 ECM/PCM connector A (31P).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2552: Throttle Actuator Control Module Relay Malfunction (2006 Model)

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

Scheme 417

Scheme 417: DTC P2552: Throttle Actuator Control Module Relay Malfunction (2006 Model)

Scheme 418

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, 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 ECM/ 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 ECM/PCM connector E (31P).
Check for continuity between ECM/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 ECM/PCM (E3), then go to step 10 . NO - Go to step 9 .
Test the throttle actuator control module relay (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/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 ECM/PCM connector E (31P).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see ECM/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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC U0107: Lost Communication With Throttle Actuator Control Module (2004-2005 Models)

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 419

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Scheme 427

Scheme 428

Scheme 429

Scheme 430

Scheme 431

Scheme 432

Scheme 433

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 poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM/PCM, then go to step 50 . If the connections 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 46 . NO - Intermittent failure, 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 ECM/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 it open after the throttle valve 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 40 . NO - Go to step 34 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminal No. 7 and body ground. THROTTLE ACTUATOR CONTROL MODULE 16P CONNECTOR Is there continuity? YES - Go to step 16 . NO - Repair open in the wire between the throttle actuator control module and G101, then go to step 50 .
Remove the throttle actuator control module relay (A).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 1 and body ground. THROTTLE ACTUATOR CONTROL MODULE RELAY 4P CONNECTOR Is there battery voltage? YES - Go to step 19 . NO - Go to step 18 .
Check the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse in 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 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then go to step 50 . NO - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then replace the fuse, and go to step 50 .
Install the throttle actuator control module relay.
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module 16P connector terminal No. 2 and body ground. Is there battery voltage for about 2 seconds? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . 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/tl/iii-2003-2006/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 50 .
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 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 (FI MAIN), then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (31P).
Check for continuity between ECM/PCM connector terminal A3 and throttle actuator control module relay 4P connector terminal No. 3. Is there continuity? YES - Go to step 31 . NO - Repair open in the wire between the ECM/PCM (A3) and the throttle actuator control module relay, then go to step 50 .
Check for continuity between throttle actuator control module 16P connector terminal No. 2 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 50 . NO - Go to step 32 .
Connect throttle actuator control module relay 4P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 56 . NO - Repair open in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the throttle actuator control module 16P connector.
Disconnect ECM/PCM connector E (31P).
Check for continuity between ECM/PCM connector terminal E25 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E25) and the throttle actuator control module, then go to step 50 . NO - Go to step 39 .
Check for continuity between ECM/PCM connector terminal E25 and throttle actuator control module 16P connector terminal No. 6. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . If DTC U0107 is indicated, go to step 56 . NO - Repair open in the wire between the ECM/PCM (E25) and the throttle actuator control module, then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the throttle actuator control module 16P connector.
Disconnect ECM/PCM connector E (31P).
Check for continuity between ECM/PCM connector terminal E26 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (E26) and the throttle actuator control module, then go to step 50 . NO - Go to step 45 .
Check for continuity between ECM/PCM connector terminal E26 and throttle actuator control module 16P connector terminal No. 14. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . If DTC U0107 is indicated, go to step 56 . NO - Repair open in the wire between the ECM/PCM (E26) and the throttle actuator control module, then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connectors B (24P) and E (31P).
Check for continuity between body ground and ECM/PCM connector terminals B15 and E3 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 ECM/PCM. Then reconnect all connectors, and go to step 6 . NO - Repair open in the wire between the ECM/PCM (B15, E3) and G101, then go to step 50 .
Turn the ignition switch OFF.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES -If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC U0107: Lost Communication With Throttle Actuator Control Module (2006 Model)

CAUTION

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

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Scheme 443

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Scheme 448

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 poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM/PCM, then go to step 50 . If the connections 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 46 . NO - Intermittent failure, 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 ECM/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 it open after the throttle valve 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 40 . NO - Go to step 34 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminal No. 7 and body ground. Is there continuity? YES - Go to step 16 . NO - Repair open in the wire between the throttle actuator control module and G101, then go to step 50 .
Remove the throttle actuator control module relay (A).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 19 . NO - Go to step 18 .
Check the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse in 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 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then go to step 50 . NO - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then replace the fuse, and go to step 50 .
Install the throttle actuator control module relay.
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module 16P connector terminal No. 2 and body ground. Is there battery voltage for about 2 seconds? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . 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/tl/iii-2003-2006/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 50 .
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 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 (FI MAIN), then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector E (31P).
Check for continuity between ECM/PCM connector terminal E3 and throttle actuator control module relay 4P connector terminal No. 3. Is there continuity? YES - Go to step 31 . NO - Repair open in the wire between the ECM/PCM (E3) and the throttle actuator control module relay, then go to step 50 .
Check for continuity between throttle actuator control module 16P connector terminal No. 2 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 50 . NO - Go to step 32 .
Connect throttle actuator control module relay 4P connector terminal No. 2 to body ground with a jumper wire.
Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 56 . NO - Repair open in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the throttle actuator control module 16P connector.
Disconnect ECM/PCM connector A (31P).
Check for continuity between ECM/PCM connector terminal A25 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A25) and the throttle actuator control module, then go to step 50 . NO - Go to step 39 .
Check for continuity between ECM/PCM connector terminal A25 and throttle actuator control module 16P connector terminal No. 6. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . If DTC U0107 is indicated, go to step 56 . NO - Repair open in the wire between the ECM/PCM (A25) and the throttle actuator control module, then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the throttle actuator control module 16P connector.
Disconnect ECM/PCM connector A (31P).
Check for continuity between ECM/PCM connector terminal A26 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A26) and the throttle actuator control module, then go to step 50 . NO - Go to step 45 .
Check for continuity between ECM/PCM connector terminal A26 and throttle actuator control module 16P connector terminal No. 14. Is there continuity? YES - Substitute a known-good throttle actuator control module (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 and recheck. If DTC U0107 is not indicated, throttle actuator control module replacement (see «THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 50 . If DTC U0107 is indicated, go to step 56 . NO - Repair open in the wire between the ECM/PCM (A26) and the throttle actuator control module, then go to step 50 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (24P) and A (31P).
Check for continuity between body ground and ECM/PCM connector terminals B15 and A3 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 ECM/PCM. Then reconnect all connectors, and go to step 6 . NO - Repair open in the wire between the ECM/PCM (B15, A3) and G101, then go to step 50 .
Turn the ignition switch OFF.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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 smoothly, check the pedal, the throttle cable, and the APP sensor. If you find a problem replace the faulty part(s).

Scheme 449

Scheme 449: 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 accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is below 2%, the APP sensor is OK. If it is above 2%, adjust the throttle cable (see «THROTTLE CABLE ADJUSTMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 4 .
Check the APP SENSOR again. If it is below 2%, the APP sensor is OK. If it is above 2%, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then go to step 5 .
Check the APP SENSOR again. If it is below 2%, the APP sensor is OK. If it is above 2%, replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 450

Scheme 450: APP Sensor Replacement

Remove the throttle cable (see «THROTTLE CABLE REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ).
Disconnect the accelerator pedal position (APP) sensor 6P connector (A).
Remove the bolts (B), and the APP sensor (C).
Install the sensor in the reverse order of removal.

Scheme 451

Scheme 451: Throttle Actuator Control Module Replacement

Remove the glove box and panel (see «GLOVE BOX REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-removalinstallation) ).
Disconnect the throttle actuator control module 16P connector (A).
Remove the bolts (B), and the throttle actuator control module (C).
Install the control module in the reverse order of removal.

Electronic Throttle Control System Acura TL III

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DTC Troubleshooting

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 Circuit Range/Performance Problem

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DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2004-2005 Models)

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DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage (2006 Model)

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DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2004-2005 Models)

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DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage (2006 Model)

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DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2004-2005 Models)

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DTC P2127: APP Sensor B (Throttle Position Sensor E) Circuit Low Voltage (2006 Model)

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DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2004-2005 Models)

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DTC P2128: APP Sensor B (Throttle Position Sensor E) Circuit High Voltage (2006 Model)

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