CONTROL GP-ENG RATINGS ELEK 1486536 - Caterpillar

Illustration 3 g01345695
A typical view of the P2 connector (ECM side) pin locations.Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 4 g01325579
Typical engine ECM (1) J2 ECM connector (2) J1 ECM connector
Thoroughly inspect ECM connector P1 and any other connectors that are associated with the throttle switch. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the sensor connector and the ECM connector that are associated with the active diagnostic code. Refer to illustration 2.
Verify that the latch tab of the connector is correctly latched. Also verify that the latch tab of the connector has returned to the fully latching position.
Check the torque of the allen head screw on the ECM connectors. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and the wiring for abrasion and for pinch points from the switch back to the ECM.Expected Result:All of the connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and the connectors appear to be OK. Proceed to Test Step 3.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.If applicable, use Caterpillar Electronic Technician (ET) to perform a wiggle test.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:One or both of the diagnostic codes for the throttle signal are active.Results:
OK - A 91-2 diagnostic code is active at this time. Proceed to Test Step 3.
Not OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to the service Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 3. Check the Throttle Command at the Machine Control Module
Turn the keyswitch to the ON position.
Use a multimeter to monitor the percent duty cycle of the throttle command at the machine control module. Adjust the throttle switch from the low idle position to the high idle position.
Turn the keyswitch to the OFF position.Expected Result:At low idle, the duty cycle is not between 5 percent and 10 percent. At high idle, the duty cycle is not between 90 percent and 95 percent.Results:
OK - The throttle command is not correct. There may be a problem with the throttle switch or the engine control module. Proceed to Test Step 4.
Not OK - The throttle command is correct. Repair: Refer to service Troubleshooting, "Electrical Connectors - Inspect" if the fault is intermittent.STOPTest Step 4.