P2122
DTC P2122: APP Sensor 1 Circuit Low VoltageNOTE: If DTC P0641 is indicated at the same time as DTC P2122, troubleshoot DTC P0641 first, then recheck for P2122.
1. Turn the ignition switch ON (II).
2. Check APP SENSOR-1 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 at the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).
6. 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.
7. Turn the ignition switch OFF.
8. 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 kOhms?
YES - Go to step 9.
NO - Go to step 15.
9. 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 kOhms?
YES - Go to step 10.
NO - Go to step 15.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (56P).
12. At the wire harness side, check for continuity between the APP sensor 6P connector terminal No.4 and body ground.
Is there continuity?
YES - Repair short in the wire between APP sensor 1 and the PCM (B44), then go to step 16.
NO - Go to step 13.
13. Check for continuity between the 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 APP sensor 1 and the PCM (B44), then go to step 16.
14. 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 APP sensor 1 and the PCM (B43), then go to step 16.
15. Replace the APP sensor.
16. Reconnect the PCM connectors.
17. Turn the ignition switch ON (II).
18. Reset the PCM with the HDS.
19. Do the PCM idle learn procedure.
20. 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 1 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.
21. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
22. Do the PCM idle learn procedure.
23. 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 1 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.