EDGE-CUTTING 4747181 - Caterpillar

Illustration 1 g00995627
Schematic
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P1 ECM connectorTest Step 1. Inspect Electrical Connectors and Wiring
Place the engine control in the OFF/RESET mode.
Thoroughly inspect the J1/P1 ECM connector, the J62 service tool connector, and all other connectors in the circuit for the Cat Data Link. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Shorts in the Harness
Disconnect the J1/P1 ECM connector.
Disconnect Cat ET from the service tool connector.
Measure the resistance between P1-8 (Cat Data Link +) and P1-9 (Cat Data Link −).
Measure the resistance between P1-8 (Cat Data Link +) and chassis ground.
Measure the resistance between P1-9 (Cat Data Link −) and chassis ground.Expected Result:The resistance is greater than 20,000 Ohms for each measurement.Results:
OK - Proceed to Test Step 3.
Not OK - There is a short circuit in the harness or connectors.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 3. Check the Resistance through the Harness
Use a suitable piece of wire to short J62-D (Cat Data Link +) and J62-E (Cat Data Link −) at the service tool connector.
Measure the resistance between P1-8 (Cat Data Link +) and P1-9 (Cat Data Link −).Expected Result:The resistance is less than 10 Ohms for each measurement.Results:
OK - The Cat Data Link is OK.Repair: Refer to Troubleshooting, "Electrical Connectors - Inspect" if the problem is intermittent.STOP
Not OK - There is an open circuit or excessive resistance in the harness or connectors.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOP