P0122
DTC P0122: TP Sensor Circuit Low Voltage1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then turn the ignition switch OFF.
2. Turn the ignition switch ON (II).
3. 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 terminals at the TP sensor and at the PCM.
NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Disconnect the TP sensor 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between TP sensor 3P connector terminals No.1 and No.3.
Is there about 5 V ?
YES - Go to step 8.
NO - Go to step 15.
8. Turn the ignition switch OFF.
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 (the TP sensor is not available separately).
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 (the TP sensor is not available separately).
11. Disconnect PCM connector C (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 PCM (C27) and the TP sensor.
NO - Go to step 13.
13. Connect PCM connector terminal C27 to body ground with a jumper wire.
14. At the wire harness side, check for continuity between TP sensor 3P connector terminal No.2 and body ground.
Is there continuity?
YES - Substitute a known-good PCM and recheck. If prescribed voltage is now available, replace the original PCM.
NO - Repair open in the wire between the PCM (C27) and the TP sensor.
15. Measure voltage between PCM connector terminals C18 and C28.
Is there about 5 V ?
YES - Repair open in the wire between the PCM (C28) and the TP sensor.
NO - Substitute a known-good PCM and recheck. If voltage is normal, replace the original PCM.