CONTROL GP-GOVERNOR 3336226 - Caterpillar

Illustration 1 g00784683
Typical schematic
Illustration 2 g00947988
Typical schematicTest Step 1. Check for Connector Damage.
Turn the circuit breaker for the battery to the OFF position.
Turn the keyswitch to the OFF 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. The harness and wiring are 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 and/or wiring or replace the connectors and/or wiring. Stop.Test Step 2. Check for a Short Circuit in the Harness.
If the problem is with the analog supply for the front engine or for the rear engine, disconnect ECM connector J1/P1. If the problem is with the analog supply for the master ECM, disconnect ECM connector J2/P2.
Disconnect all of the analog sensors.
Measure the resistance between the analog supply pin 36 and the analog return pin 30.
Measure the resistance between the analog supply pin 36 and the engine ground.
Measure the resistance between the analog return pin 30 and the engine ground.Expected Result:The resistance is more than 20,000 Ohms for each measurement.Results:
OK - The resistance is greater than 20,000 Ohms. Proceed to Test Step 3.
Not OK - The resistance is less than 20,000 Ohms.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring. Stop.Test Step 3. Check the Analog Sensor Supply Voltage at the ECM.
Remove the wire that is in pin 36 from the ECM connector. Install a wire jumper into the socket for pin 36.
Remove the wire that is in pin 30 from the ECM connector. Install a wire jumper into the socket for pin 30.Note: If you remove the sensor common from the ECM, an open circuit diagnostic code will be generated for all sensors that use the sensor common. Troubleshoot the original code. Delete the logged diagnostic codes when you are finished.
Reconnect the ECM connector.
Turn the circuit breaker for the battery to the ON position.
Turn the keyswitch to the ON position. The engine should be off.
Measure the voltage between the wire jumpers in pin 36 and pin 30.
Turn the keyswitch to the OFF position.
Remove the jumper wires and reconnect the wires that were in pin 36 and in pin 30.
Reconnect the ECM connector.Expected Result:The supply voltage is