6735M Mariner CRANKCASE ASSEMBLY

Illustration 1 g00979679
Typical example
Test Step 1. Check for Connector Damage.
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Resistance of the Prelube Pressure Switch at the ECM.
Turn the ECS to the OFF/RESET position.
Disconnect ECM connector J1/P1.
Ensure that the prelube override switch is not activated.
Measure the resistance between the prelube pressure switch P1-20 and the digital return P1-29.
Reconnect the ECM connector P1. Expected Result:The resistance should be greater than 20,000 Ohms.Note: If the engine has been running, the residual oil pressure may be high enough to activate the prelube pressure switch. If the residual oil pressure is high, the resistance would be less than 5 Ohms.Results:
OK - The resistance is greater than 20,000 Ohms. The prelube pressure switch is not active. Proceed to Test Step 4.
Not OK - The resistance is less than 20,000 Ohms. The prelube pressure switch is active. Verify that the engine does not have a residual oil pressure that is high enough to activate the switch. If there is no residual oil pressure, the switch is not operating correctly or there is a problem with the wiring. Proceed to Test Step 3.Test Step 3. Measure the Resistance of the Prelube Pressure Switch at the Prelube Pressure Switch.
Turn the ECS to the OFF/RESET position.
Disconnect the wires from the terminals of the prelube pressure switch.
Measure the resistance between the terminals of the prelube pressure switch. Expected Result:The resistance should be greater than 20,000 Ohms.Results:
OK - The resistance is greater than 20,000 Ohms. There is a problem with the wiring between ECM connector J1/P1 and the switch.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOP
Not OK - The resistance is less than 20,000 Ohms. There is a problem with the prelube pressure switch.Repair: Temporarily replace the prelube pressure switch with a new switch. If the problem is no longer present, reinstall the old switch. If the problem returns, replace the switch.STOPTest Step 4. Check the Status of the ECS and the Prelube Pressure Switch on the Caterpillar Electronic Technician (ET).
Use the Cat ET and view the following parameters: Engine Prelube and Ignition Switch.
Turn the ECS to the STOP position.
View the parameters for the prelube pressure switch and the ignition switch.
Connect the Cat ET to the service tool connector.
Go to the diagnostic test in the diagnostic section on the CAT ET. Activate the override for the engine prelube.
View the parameters for the prelube pressure switch and the ignition switch.
Disable the override for the