W/Harness Inspection

P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input

Inspection/Repair - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "TPS circuit inspection" procedure.

Power Supply Circuit Inspection

1. Key "OFF".
2. Disconnect TPS connector.
3. Key "ON".
4. Measure the voltage between terminal 2 of TPS harness connector and chassis ground.
A. Specification : Approx. 5 V




5. Is the measured voltage within specifications?
YES
1) Go to "Ground circuit inspection" procedure
NO
1) Check for Open or Short in TPS circuit. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Ground Circuit inspection

1. Key "OFF".
2. Disconnect TPS connector.
3. Key "ON".
4. Measure the voltage between terminal 2 of TPS harness connector and chassis ground. (A)
5. Measure the voltage between terminal 2 and 3 of TPS harness connector. (B)
A. Specification : "A" - "B" = Below 200mV




6. Is the measured voltage within specifications?
YES
1) Go to "Signal circuit inspection" procedure
NO
1) Check for Open in ground circuit. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Signal Circuit Inspection

1. Check for open in signal circuit
(1) Key "OFF".
(2) Disconnect TPS connector.
(3) Key "ON".
(4) Measure the voltage between terminal 1 of TPS harness connector and chassis ground.
A. Specification : Approx. 5 V




(5) Is the measured voltage within specification?
YES
1) Go to "Check for Short in signal circuit" procedure.
NO
1) Repair Open or Short to power in signal circuit and go to "Verification of Vehicle Repair" procedure.
2. Check for short in signal circuit
(1) Key "OFF".
(2) Disconnect TPS connector and ECM connector.
(3) Measure the resistance between terminal 1 and 2 of TPS harness connector.
A. Specification : Infinite




(4) Is the measured resistance within specification?
YES
1) Go to "Component inspection" procedure.
NO
1) Repair Short to power in signal circuit and go to "Verification of Vehicle Repair" procedure.