F485781 Force STARTER INTERLOCK LOCK

Illustration 1 g00952703
Schematic
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J1/P1 ECM connectorTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector, the J2/P2 ECM connector, the J3/P3 machine connector, and all other connectors in the wiring harness. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.Expected Result:All connectors, pins, and sockets should be completely inserted and coupled. The harness and wiring should be free of corrosion, abrasion, and pinch points. All connections and grounds should be tight and free of corrosion.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 2. Check the Sensor Supply Voltage at the Sensor Connector
Disconnect the suspect sensor.
Turn the keyswitch to the ON position.
Measure the voltage across terminal A (+5V Analog) and terminal B (Analog Return) at the harness side of the suspect sensor connector.
Turn the keyswitch to the OFF/RESET position.Expected Result:The analog sensor supply voltage should be 5.0 0.5 VDC.Results:
OK - The supply voltage is reaching the sensor. Proceed to Test Step 3.
Not OK - The supply voltage is not reaching the sensor.Repair: Refer to Troubleshooting, "Analog Sensor Supply Circuit - Test" for the appropriate troubleshooting procedure. Stop.Test Step 3. Short the Sensor Signal at the Sensor Connector
Turn the keyswitch to the OFF/RESET position.
Connect an electronic service tool to the service tool connector.
Disconnect the suspect sensor from the harness.
Turn the keyswitch to the ON position.
Check for active diagnostic codes on the electronic service tool.Note: There should be an open circuit diagnostic code for the suspect sensor.
Use a suitable piece of wire to short terminal B (Analog Return) and terminal C (Signal) at the harness side of the suspect sensor connector.
Check for active diagnostic codes on the electronic service tool.Note: There should be a short circuit diagnostic code for the suspect sensor.Expected Result:The FMI for the active diagnostic code should change from a "03" (Open/Short to +Battery) to a "04" (Short to Ground) when the terminals are shorted.Results:
OK - The harness appears to be OK. The problem is with the sensor.Repair: Replace the suspect sensor.Verify that the repair eliminates the problem. Stop.
Not OK - Proceed to Test Step 4.Test Step 4. Measure the Resistance of the Signal Wire
Disconnect the suspect sensor and the ECM connector for that sensor.
Measure the resistance between terminal C (Signal) at the harness side of the suspect sensor connector and the appropriate terminal for the sensor signal at the ECM connector.Expected Result:The resistance through the signal wire should be less than 10 Ohms.Results:
OK - Proceed to Test Step 5.
Not OK - There is an open circuit or excessive resistance in the signal circuit of the harness.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 5. Short the Sensor Signal at the ECM
Turn the keyswitch to the OFF/RESET position and install a 140-2266 Adapter Cable (70 Pin Breakout T) at the J2/P2 ECM connector.
Remove the suspect signal wire from the ECM connector.
Turn the keyswitch to the ON position.
Check for active diagnostic codes on the electronic service tool.
Use a suitable piece of wire to short the terminal for the suspect sensor signal to P1:3 (Analog Sensor Return) at the breakout.
Check for active diagnostic codes on the electronic service tool.Expected Result:The FMI for the active diagnostic code should change from a "03" (Open/Short to +Battery) to a "04" (Short to Ground) when the terminals are shorted.Results:
OK - There is a problem in the wiring between the suspect sensor and the ECM.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.
Not OK - The ECM is not reading the sensor circuit.Repair: Verify your results. Replace the ECM. Refer to Troubleshooting, "Replacing the ECM" before you replace the ECM.Verify that the repair eliminates the problem. Stop.