DTC P0123: TP Sensor Circuit High Voltage
- Turn the ignition switch ON (II).
- 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. |
NO |
- Go to step 3. |
- Turn the ignition switch OFF.
- Disconnect the TP sensor 3P connector.
- Turn the ignition switch ON (II).
- At the wire harness side, measure voltage between the TP sensor 3P connector terminals No. 1 and No. 3.
TP SENSOR 3P CONNECTOR
Wire side of female terminals
Is there about 5 V?
YES |
- Replace the throttle body. |
NO |
- Go to step 7. |
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- Measure voltage between ECM/PCM connector terminals A10 and A20.
ECM/PCM CONNECTOR A (31P)
Wire side of female terminals
Is there about 5 V?
YES |
- Repair open in the wire between the ECM/PCM (A10) and the TP sensor. |
NO |
- Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. |
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