P2122
DTC P2122: APP Sensor A (Throttle Position Sensor D) Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0107, P0112, P0117, P2122, P2127, P2228, P0452, P2627, and P2630 indicated at the same time?
YES - Go to step 18.
NO - Go to step 4.
4. Check APP SENSOR-A in the DATA LIST with the HDS.
Is there about 0.1 V, or less with the accelerator pedal fully pressed?
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 A and at the ECM/PCM.
5. Turn the ignition switch OFF.
6. Disconnect the APP sensor 6P connector.
7. Turn the ignition switch ON (II).
8. 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 9.
NO - Go to step 17.
9. Turn the ignition switch OFF.
10. 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 11.
NO - Go to step 27.
11. 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?
YES - Go to step 12.
NO - Go to step 27.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector D (17P).
14. 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 28.
NO - Go to step 15.
15. Connect ECM/PCM connector terminal D3to body ground with a jumper wire.
16. 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 33.
NO - Repair open in the wire between APP sensor A and the ECM/PCM (D3), then go to step 28.
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 28.
NO - Go to step 33.
18. Turn the ignition switch OFF.
19. Jump the SCS line with the HDS.
20. Disconnect ECM/PCM connectors A (31P) and D (17P).
21. Disconnect the connectors from these parts:
- MAP sensor
- Front/Rear A/F sensor
- APP sensor
- IMRC actuator
- EGR valve
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) speed sensor
22. Check for continuity between body ground and ECM/PCM connector terminals A31, D2, D6, and D12 individually.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A31, D2, D6, or D12) and each part, then go to step 28.
NO - Go to step 23.
23. Reconnect ECM/PCM connectors A (31P) and D (17P).
24. Turn the ignition switch ON (II).
25. Measure voltage between ECM/PCM connector terminal D6 and body ground.
Is thereabout 5 V?
YES - Go to step 26.
NO - Go to step 33.
26. Continue to monitor voltage at ECM/PCM connector terminal D6 while reconnecting these parts, one at a time:
- MAP sensor
- Front/Rear A/F sensor
- APP sensor
- IMRC actuator
- EGR sensor
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) sensor
Did the voltage drop to about 0 V?
YES - Replace the sensor that caused the voltage to drop, then go to step 30.
NO - Go to step 33.
27. Replace the APP sensor.
28. Reconnect all connectors.
29. Turn the ignition switch ON (II).
30. Reset the ECM/PCM with the HDS.
31. Do the ECM/PCM idle learn procedure. Programming and Relearning
32. 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.
33. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
34. 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.