STEP 2. Measure the OSS-ECU IG signal voltage at ECM harness side connector.
(1) Disconnect the ECM connector and measure at the harness side.
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between terminal IGN and ground.- Voltage should be 12V starter battery positive voltage.
(4) Turn off the power supply mode of the electric motor switch.
Is 12V starter battery positive voltage (approximately 12 volts) present?
Go to Step 3. Repair or replace the connector(s), or check and repair the harness of short to ground and open circuit in IGN line between ETACS-ECU connector and ECM connector. Then go to Step 7.