P0122
DTC P0122: TP Sensor Circuit Low Voltage1. Start the engine. Hold the engine speed at 3,000 rpm without 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 TP SENSOR in the DATA LIST with the HDS.
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 the ECM.
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 17.
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.
YES - Go to step 10.
NO - Replace the throttle body.
10. At the sensor side, measure resistance between TP sensor 3P connector terminals No.2 and No.3 with the throttle fully closed.
YES - Go to step 11.
NO - Replace the throttle body.
11. Disconnect ECM connector C (31P).
12. 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 (C27) and the TP sensor (M/T model).
NO - Go to step 15.
13. Disconnect TCM connector B (22P).
14. 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 (C27), the TCM (84) and the TP sensor.
NO - Substitute a known-good TCM, and recheck. If the symptom/indication goes away, replace the original TCM.
15. Connect ECM connector terminal C27 to body ground with a jumper wire.
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 (C27) and the TP sensor.
16. 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 (C27) and the TP sensor.
17. Measure voltage between ECM connector terminals C18 and C28.
Is there about 5 V?
YES - Repair open in the wire between the ECM (C28) 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.