P0122
DTC P0122: TP Sensor Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Check the TP SENSOR in the DATA LIST with the HDS.
Is there about 0.5 V when the throttle is fully closed and about 4.5 V when the throttle is fully opened?
YES - Check for poor connections or loose terminals at the TP sensor, the TCM, and the ECM, then recheck. If DTC P0122 is indicated, go to step 18 (CVT model only). If DTC P0122 is not indicated, or the vehicle you are diagnosing is an M/T model, intermittent failure, system is OK at this time.
NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the TP sensor 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between TP sensor 3P connector terminals No.1 and No.3.
Is there about 5 V?
YES - Go to step 7.
NO - Go to step 17
7. Turn the ignition switch OFF.
8. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
9. At the sensor side, measure resistance between TP sensor 3P connector terminals No.1 and No.2 with the throttle fully closed.
Is there about 0.5 - 0.9 kOhms?
YES - Go to step 10.
NO - Replace the throttle body.
10. Measure resistance between TP sensor 3P connector terminals No.2 and No.3 with the throttle fully closed.
Is there about 4.5 kOhms?
YES - Go to step 11.
NO - Replace the throttle body.
11. Disconnect ECM connector A (31P).
12. At the wire harness side, check for continuity between TP sensor 3P connector terminal No.2 and body ground.
Is there continuity?
YES -
- Go to step 13 (CVT model).
- Repair short in the wire between the ECM (A15) and the TP sensor (M/T model).
NO - Go to step 15.
13. Disconnect TCM connector C (17P).
14. At the wire harness, check for continuity between TP sensor 3P connector terminal No.2 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (A15), TCM (C9), and the TP sensor.
NO - Update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
15. Connect ECM connector terminal A15 to body ground with a jumper wire.
16. At the wire harness side, check for continuity between TP sensor 3P connector terminal No.2 and body ground.
Is there continuity?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair open in the wire between the ECM (A15) and the TP sensor.
17. Measure voltage between ECM connector terminals A10 and A20.
Is there about 5 V?
YES - Repair open in the wire between the ECM (A20) and the TP sensor.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
18. Turn the ignition switch OFF.
19. Disconnect the TP sensor 3P connector.
20. Disconnect TCM connector C (17P).
21. Connect TP sensor 3P connector terminal No.2 to body ground with a jumper wire.
22. Check for continuity between TCM connector terminal C9 and body ground.
Is there continuity?
YES - Update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
NO - Repair open in the wire between TCM (C9) and the TP sensor.