Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found?

	▶ Repair if necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Signal Circuit Inspection" procedure.

Ignition "OFF" & Engine "OFF".

Disconnect TPMS ECU, PCM and ABS ECU connector.

Measure resistance between CAN HIGH, LOW terminal of the TPMS ECU harness connector and CAN HIGH, LOW terminal terminal of the PCM harness connector.

Measure resistance between CAN HIGH, LOW terminal of the TPMS ECU harness connector and CAN HIGH, LOW terminal terminal of the ABS ECU harness connector.

Measure resistance between Vehicle speed in terminal of the PCM harness connector and Vehicle speed out terminal of the ABS ECU harness connector.

Measure resistance between FR WSS Power terminal of the ABS ECU harness connector and FR WSS Power terminal of the FR WSS harness connector.

Measure resistance between FR WSS Signal terminal of the ABS ECU harness connector and FR WSS Signal terminal of the FR WSS harness connector.

Is the measured resistance within specifications?

	▶ Faulty FR WSS, ABS ECU and PCM may cause this DTC.
	▶ Substitute with a known-good component and check for proper operation. If problem is corrected, it's failure should cause this DTC. After doing an appropriate repair, Go to "Verification of Vehicle Repair" procedure. ▶ Repair in speed signal circuit between each control unit harness connector and TPMS receiver harness connector and then go to "Verification of Vehicle Repair" procedure.