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P2138

DTC P2138: APP Sensor 1/2 Incorrect Voltage Correlation

1. Turn the ignition switch ON (II).
2. Check APP SENSOR-1 and APP SENSOR-2 in the DATA LIST with the HDS.

Do APP SENSOR-1 and APP SENSOR-2 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 at the PCM.

NO - Go to step 3.

3. Check APP SENSOR-1 and APP SENSOR-2 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.

4. Turn the ignition switch OFF.
5. Jump the SCS line with the HDS.
6. Disconnect the APP sensor 6P connector.
7. Disconnect PCM connector B (56P).




8. Check for continuity between the 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.

9. Turn the ignition switch OFF.
10. Replace the APP sensor.
11. Reconnect the PCM connector B (56P).
12. Turn the ignition switch ON (II).
13. Reset the PCM with the HDS.
14. Do the PCM idle learn procedure.
15. 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.

16. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
17. Do the PCM idle learn procedure.
18. 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.