Electronic Throttle Control System — Acura MDX I (2000-2006)

Scheme 218

Scheme 218: Component Location Index

Scheme 219

Scheme 220

DTC

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 Range/Performance Problem
DTC P2122	APP Sensor A (TP Sensor D) Circuit Low Voltage
DTC P2123	APP Sensor A (TP Sensor D) Circuit High Voltage
DTC P2127	APP Sensor B (TP Sensor E) Circuit Low Voltage
DTC P2128	APP Sensor B (TP Sensor E) Circuit High Voltage
DTC P2135	Throttle Position Sensor A/B Incorrect Voltage Correlation
DTC P2138	APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
DTC P2176	Throttle Actuator Control System Idle Position Not Learned
DTC P2552	Throttle Actuator Control Module Relay Malfunction
DTC U0107	Lost Communication with Throttle Actuator Control Module

DTC CHART

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 ). Information marked with an asterisk (*) applies to 2003-2004 models. Information marked with double asterisk (**) applies to 2005-2006 models.

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 0.28* (0.3)** 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 TP sensor A and the PCM.
Turn the ignition switch OFF.
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 TP sensor A (at the throttle actuator control module) and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P0123: TP Sensor A Circuit High Voltage

Turn the ignition switch ON (II).
Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.75* (4.8)** 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 TP sensor A and the PCM.
Turn the ignition switch OFF.
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 TP sensor A and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P0222: TP Sensor B Circuit Low Voltage

Turn the ignition switch ON (II).
Check TP SENSOR B in the DATA LIST with the HDS. Is there about 0.18* (0.3)** V or less when the throttle pedal is fully pressed? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at TP sensor B and the PCM.
Turn the ignition switch OFF.
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 TP sensor B (at the throttle actuator control module) and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P0223: TP Sensor B Circuit High Voltage

Turn the ignition switch ON (II).
Check TP SENSOR B in the DATA LIST with the HDS. Is there about 4.84* (4.8) ** 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 TP sensor B and the PCM.
Turn the ignition switch OFF.
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 TP sensor B and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 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 221

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 at the throttle actuator control module.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Push the throttle valve closed side as shown.
Release the throttle valve. Does the throttle valve return? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 12 . NO - Go to step 11.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1683 is indicated, 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 222

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 at the throttle actuator control module.
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Push the throttle valve open side (Scheme 222)
Release the throttle valve. Does the throttle valve return? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 12. NO - Go to step 11.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) )
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Turn the ignition switch OFF, and wait 10 seconds.
Turn the ignition switch ON (II).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1684 is indicated, 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

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

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 actuator control module and at the PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Visually check the throttle valve operation. NOTE: Be careful not to pinch a finger during check. Does the throttle valve operate smoothly? YES - Go to step 20 . NO - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 15 and recheck. If DTC P2101 is indicated, go to step 12.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive 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. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2101 is indicated, check for poor connections or loose terminals at the throttle actuator control module and at the 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
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 actuator control module and at the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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 body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), and recheck. If DTC P2108 is not indicated, replace the original throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ). NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module and at the PCM.

DTC P2118: Throttle Actuator Current Range/Performance Problem

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

Turn the ignition switch ON (II)
Clear the DTC with the HDS.
Press the accelerator pedal several times.
Check for Temporary DTCs or DTCs with the HDS. Is DTC P2118 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 actuator control module and at the PCM.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2118 is indicated, substitute a known good throttle body assembly and recheck. If the symptom goes away, replace the original throttle body assembly. NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0641 is indicated at the same time as DTC P2122, troubleshoot DTC P0641 first, then recheck for P2122.

Scheme 223

Scheme 223: DTC P2122: APP Sensor A (TP Sensor D) Circuit Low Voltage

Scheme 224

Scheme 225

Scheme 226

Scheme 227

Scheme 228

Turn the ignition switch ON (II)
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0° 0% or 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 the APP sensor and the 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 14 .
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 ? YES - Go to step 9. NO - Go to step 15 .
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 k ohm ? YES - Go to step 10. NO - Go to step 15 .
Jump the SCS line with the HDS.
Disconnect PCM connector B (56P).
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 the APP sensor and the PCM (B44), then go to step 16 . NO - Go to step 13.
Check for continuity between PCM connector terminal B44 and APP sensor 6P connector terminal No. 4. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the APP sensor and the PCM (B44), then go to step 16 .
Check for continuity between PCM connector terminal B43 and APP sensor 6P connector terminal No. 5. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the APP sensor and the PCM (B43), then go to step 16 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect PCM connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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

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

Scheme 229

Scheme 229: DTC P2123: APP Sensor A (TP Sensor D) Circuit High Voltage

Scheme 230

Turn the ignition switch ON (II).
Check APP SENSOR A in the DATA LIST with the HDS. Is there about 88°, 88% or 4.85 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 the APP sensor and at the 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 11 . NO - Go to step 7.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector B (56P).
Check for continuity between PCM connector terminal B45 and APP sensor 6P connector terminal No. 6. Is there continuity? YES - Go to step 17 . NO - Repair open in the wire between the APP sensor and the PCM (B45), then go to step 12 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect the PCM connector B (56P).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0641 is indicated at the same time as DTC P2122, troubleshoot DTC P0651 first, then recheck for P2127.

Scheme 231

Scheme 231: DTC P2127: APP Sensor B (TP Sensor E) Circuit Low Voltage

Scheme 232

Scheme 233

Scheme 234

Scheme 235

Scheme 236

Turn the ignition switch ON (II).
Check APP SENSOR B in the DATA LIST with the HDS. Is there about 0°, 0%or 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 the APP sensor and the 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 14 .
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 k ohm? YES - Go to step 9. NO - Go to step 15 .
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 5.6 - 6.8 k ohm? YES - Go to step 10. NO - Go to step 15 .
Jump the SCS line with the HDS.
Disconnect PCM connector B (56P).
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 the APP sensor and the PCM (B30), then go to step 16 . NO - Go to step 13.
Check for continuity between PCM connector terminal B30 and APP sensor 6P connector terminal No. 3. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the APP sensor and the PCM (B30), then go to step 16 .
Check for continuity between PCM connector terminal B29 and APP sensor 6P connector terminal No. 1. Is there continuity? YES - Go to step 21 . NO - Repair open in the wire between the APP sensor and the PCM (B29), then go to step 16 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect PCM connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

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

Scheme 237

Scheme 237: DTC P2128: APP Sensor B (TP Sensor E) Circuit High Voltage

Scheme 238

Turn the ignition switch ON (II).
Check APP SENSOR B in the DATA LIST with the HDS. Is there about 186°, 186% or 4.8* (4.0)** 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 the APP sensor and the 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 11 . NO - Go to step 7.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector B (56P).
Check for continuity between PCM connector terminal B31 and APP sensor 6P connector terminal No. 2. Is there continuity? YES - Go to step 17 . NO - Repair open in the wire between the APP sensor and the PCM (B31), then go to step 12 .
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect PCM connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 the APP sensor and the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2135: Throttle Position Sensor A/B Incorrect Voltage 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 ).

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2135 is indicated, go to step 7 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting. NO - Go to step 5.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2135 is indicated, go to step 7. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module and the PCM.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-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 actuator control module and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC P2138: APP Sensor A/B (TP 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 239

Scheme 239: DTC P2138: APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation

Turn the ignition switch ON (II).
Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS. Do APP SENSOR A and APP SENSOR B change to the same throttle angle when the throttle is fully opened? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the APP sensor and the PCM. NO - Go to step 3.
Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS. Are they the same voltage when the throttle is fully opened? YES - Go to step 4. NO - Go to step 9 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect the APP sensor 6P connector.
Disconnect PCM connector B (56P).
Check for continuity between body ground and PCM connector terminals B44 and B30. Is there continuity? YES - Repair short in the wire between B44 and B30, then go to step 11 . NO - Go to step 16 .
Turn the ignition switch OFF.
Replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
Reconnect PCM connector B (56P).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
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 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 PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
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 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).

DTC P2176: Throttle Actuator Control System Idle Position Not Learned

CAUTION

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

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 actuator control module and the PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II)
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Watch the throttle valve movement. Does the throttle valve operate to its full closed position? YES - Go to step 12. NO - Substitute a known-good throttle actuator control module (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 16 and recheck. If DTC P2176 is not indicated, replace the original throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 16 .
Check for sludge or carbon on the throttle valve. Is there sludge or carbon on the throttle valve? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 17 and recheck. NO - Go to step 13.
Turn the ignition switch OFF.
Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2176 is indicated, check for poor connections or loose terminals at the throttle actuator control module and at the PCM, then do the throttle body cleaning (see «THROTTLE BODY CLEANING»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), 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 P2552: Throttle Actuator Control Module Relay Malfunction

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

Scheme 240

Scheme 240: DTC P2552: Throttle Actuator Control Module Relay Malfunction

Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS. Is ETCS SYSTEM OK? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module and the PCM. NO - Go to step 4.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Turn the ignition switch ON (II).
Disconnect PCM connector A (73P).
Disconnect the throttle actuator control module 16P connector.
Measure voltage between PCM connector A29 and body ground. Is there battery voltage? YES - Repair short in the wire between the PCM and the throttle actuator control module, then go to step 13 . NO - Go to step 10.
Turn the ignition switch OFF.
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
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 body and the PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC U0107: Lost Communication with Throttle Actuator Control Module

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

Scheme 241

Scheme 241: DTC U0107: Lost Communication with Throttle Actuator Control Module

Scheme 242

Scheme 243

Scheme 244

Scheme 245

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Scheme 249

Scheme 250

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Scheme 252

Scheme 253

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 - Go to step 4. NO - Go to step 9 .
Turn the ignition switch OFF within 2 seconds after clearing the DTC with the HDS. NOTE: If the DTC is stored, clear the DTC again.
Disconnect the intake air duct from the throttle body.
Press and hold the accelerator pedal fully down.
Turn the ignition switch ON (II).
Check the throttle valve operation. Does the throttle valve close fully, then open fully? YES - Go to step 15 . NO - If the throttle valve does not close fully after the ignition is turned ON (II), go to step 21 . If the throttle valve closes fully but does not open fully, go to step 35 .
Start the engine.
Check for Temporary DTCs or DTCs with the HDS. Is DTC U0107 indicated? YES - Go to step 11. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module, the throttle actuator control module relay, the No. 7 DBW (15 A) fuse at the under-hood subfuse box, and the PCM.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (73P).
Check for continuity between body ground and PCM connector terminals A39 and A40. Is there continuity? YES - Go to step 52 . NO - Repair open in the wire between the PCM (A39, A40) and G101, then go to step 49 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (73P).
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminal No. 4 and body ground. Is there continuity? YES - Repair short in the wire between the PCM and the throttle actuator control module, then go to step 49 . NO - Go to step 20.
Check for continuity between PCM connector terminal A1 and throttle actuator control module 16P connector terminal No. 4. Is there continuity? YES - Go to step 47 . NO - Repair open in the wire between the PCM (A1) and the throttle actuator control module, then go to step 48 .
Turn the ignition switch OFF.
Disconnect the throttle actuator control module 16P connector.
Check for continuity between body ground and throttle actuator control module 16P connector terminals No. 2 and No. 10. Is there continuity? YES - Go to step 24. NO - Repair open in the wire between the throttle actuator control module and G101, then go to step 49 .
Check the TAC RELAY in the DATA LIST with the HDS. Is it ON? YES - Go to step 51 . NO - Go to step 25.
Turn the ignition switch OFF.
Turn the ignition switch ON (II).
Measure voltage between throttle actuator control module 16P connector terminal No. 6 and body ground. Is there about 3 V or more? YES - Go to step 28. NO - Go to step 41 .
Measure voltage between throttle actuator control module 16P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 47 . NO - Go to step 29.
Measure voltage between throttle actuator control relay 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 30. NO - Check the No. 7 ETC (15 A) fuse in the underhood subfuse box. If the fuse is OK, check for an open in the wire between the under-hood subfuse box and throttle actuator control relay, then go to step 49 .
Turn the ignition switch OFF.
Remove the throttle actuator control relay.
Disconnect the throttle actuator control module 16P connector.
Connect throttle actuator control 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. 1 and body ground. Is there continuity? YES - Replace the throttle actuator control relay, then go to step 48 . NO - Repair open in the wire between the throttle actuator control relay and the throttle actuator control module, then go to step 48 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (73P).
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminal No. 13 and body ground. Is there continuity? YES - Repair short in the wire between the PCM and the throttle actuator control module, then go to step 48 . NO - Go to step 40.
Check for continuity between PCM connector terminal A2 and throttle actuator control module 16P connector terminal No. 13. Is there continuity? YES - Go to step 47 . NO - Repair open in the wire between the PCM (A2) and the throttle actuator control module, then go to step 48 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (73P).
Disconnect the throttle actuator control module 16P connector.
Check for continuity between throttle actuator control module 16P connector terminal No. 6 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A29) and the throttle actuator control module, then go to step 48 . NO - Go to step 46.
Check for continuity between PCM connector terminal A29 and throttle actuator control module 16P connector terminal No. 6. Is there continuity? YES - Go to step 51 . NO - Repair open in the wire between the PCM (A29) and the throttle actuator control module, then go to step 48 .
Replace the throttle body assembly (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ).
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to step 51. NO - Troubleshooting is complete.
Update the PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ).
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 actuator control module and the 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 PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/i-2000-2006/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 properly, check the pedal, the throttle cable, and the APP sensor individually. If you find a problem in one of them, replace the part(s) that caused the problem.

Scheme 254

Scheme 254: 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/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system) ), then go to step 4.
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%, update the PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-updating-and-substitution-for-testing) ), then go to step 5.
Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is below 2%, the APP sensor is OK. If it is above 2%, replace the APP sensor (see «APP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 255

Scheme 255: APP Sensor Replacement

Scheme 256

Remove the bolts and the throttle cable cover (A).
Remove the throttle cable (see «THROTTLE CABLE REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system) ).
Disconnect the APP sensor 6P connector (A).
Remove the bolts (B) and APP sensor (C).
Install the parts in the reverse order of removal.

Electronic Throttle Control System Acura MDX I

Scheme 218

Scheme 219

Scheme 220

DTC

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

Scheme 221

DTC P1684: Throttle Valve Return Spring Performance Problem

Scheme 222

DTC P2101: Throttle Actuator System Malfunction

DTC P2108: Throttle Actuator Control Module Problem

DTC P2118: Throttle Actuator Current Range/Performance Problem

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

Scheme 223

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Scheme 226

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Scheme 228

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

Scheme 229

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

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Scheme 236

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

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Scheme 238

DTC P2135: Throttle Position Sensor A/B Incorrect Voltage Correlation

DTC P2138: APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation

Scheme 239

DTC P2176: Throttle Actuator Control System Idle Position Not Learned

DTC P2552: Throttle Actuator Control Module Relay Malfunction

Scheme 240

DTC U0107: Lost Communication with Throttle Actuator Control Module

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APP Sensor Signal Inspection

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