## DTC Troubleshooting: P0122 (7-1)

DTC P0122 (7-1): | TP Sensor Circuit Low Voltage

1. | Turn the ignition switch ON(II).

2. | Check the throttle position with the scan tool. Is there about 10% or 0.5 V when the throttle is fully closed and about 90% or 4.5 V when the throttle is fully opened? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the TP sensor and at the ECM/ PCM.n NO - Go to 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 the TP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to 7. NO - Go to 15.

7. | Turn the ignition switch OFF.

8. | At the sensor side, measure resistance between the TP sensor 3P connector terminals No. 1 and No. 2 with the throttle fully closed. Is there about 0.5-0.9 kW? YES - Go to 9. NO - Replace the throttle body.n

9. | Measure resistance between the TP sensor 3P connector terminals No. 2 and No. 3 with the throttle fully closed. Is there about 4.5kW? YES - Go to 10. NO - Replace the throttle body.n

10. | Disconnect the negative cable from the battery.

11. | Disconnect ECM/PCM 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 - Repair short in the wire between the ECM/PCM (A15) and the TP sensor.n NO - Go to 13.

13. | Connect ECM/PCM connector terminal A15 and body ground with a jumper wire.

14. | At the wire harness side, check for continuity between TP sensor 3P connector terminals No. 2 and body ground. Is there continuity? YES - Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/ PCM.n NO - Repair open in the wire between the ECM/PCM (A15) and the TP sensor.n

15. | Measure voltage between ECM/PCM connector terminals A10 and A20. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A20) and the TP sensor.n NO - Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/ PCM.n