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.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
	▶ Go to "TPS Circuit Inspection" procedure.

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect Throttle Body connector.

Ignition switch "ON"

Measure the voltage between Pin No. 2 (TPS Supply) terminal of Throttle Body harness connector and chassis ground.

Is the measured value within specification?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect Throttle Body connector.

Measure the resistance between Pin No. 1 (Ground) terminal of Throttle Body harness connector and chassis ground

Re-connect battery (-) cable.

Ignition switch "ON".

Measure the voltage between Pin No. 2 (TPS Supply) terminal of Throttle Body harness connector and chassis ground.(A)

Measure the voltage between Pin No. 2 (TPS Supply) terminal and Pin No. 1 (Ground) terminal of Throttle Body harness connector.(B)

Is the measured value within specification?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect Throttle Body connector.

Ignition switch "ON"

Measure the voltage between Pin No. 4 (TPS1 Signal) terminal of Throttle Body harness connector and chassis ground.

Measure the voltage between Pin No. 5 (TPS2 Signal) terminal of Throttle Body harness connector and chassis ground.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect ECM/PCM connector.

Measure the resistance between Pin No. 4 (TPS1 Signal) terminal of Throttle Body harness connector and Pin No. 22 (TPS1 Signal) terminal of ECM/PCM harness connector.

Measure the resistance between Pin No. 5 (TPS2 Signal) terminal of Throttle Body harness connector and Pin No. 2 (TPS2 Signal) terminal of ECM/PCM harness connector.

Is the measured value within specification?

	▶ Go to "ETC Motor Circuit Inspection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect Throttle Body connector.

Measure the resistance between Pin No. 3 (Motor +) terminal of Throttle Body harness connector and chassis ground.

Refer to "Shop Manual" and disconnect ECM/PCM connector.

Measure the resistance between Pin No. 3 (Motor +) terminal of Throttle Body harness connector and battery (+) terminal.

Measure the resistance between Pin No. 3 (Motor +) terminal of Throttle Body harness connector and Pin No. 49 (ETC Motor +) terminal of ECM/PCM harness connector.

Is the measured value within specification?

	▶ Go to "Motor (-) Circuit Inspection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect Throttle Body connector.

Measure the resistance between Pin No. 6 (Motor -) terminal of Throttle Body harness connector and chassis ground.

Refer to "Shop Manual" and disconnect ECM/PCM connector.

Measure the resistance between Pin No. 6 (Motor -) terminal of Throttle Body harness connector and battery (+) terminal.

Measure the resistance between Pin No. 6 (Motor -) terminal of Throttle Body harness connector and Pin No. 50 (ETC Motor -) terminal of ECM/PCM harness connector.

Is the measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.