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 a scan tool or 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 wires at the TP sensor and at 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 the 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 the TP sensor 3P connector terminals No. 1 and No. 2 with the throttle fully closed.
Is there about 0.5 - 0.9 kOhm?
YES - Go to step 10.
NO - Replace the throttle body.
10. Measure resistance between the TP sensor 3P connector terminals No. 2 and No. 3 with the throttle fully closed.
Is there about 4.5 kOhm?
YES - Go to step 11.
NO - Replace the throttle body.
11. Disconnect the ECM C (31P) connector.
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 (C27) and the TP sensor. (M/T model)
NO - Go to step 15.
13. Disconnect the TCM 22P connector.
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 (C27) 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 and body ground with a jumper wire.
16. At wire harness, 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 terminal C18andC28.
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.