GEAR & PINION 6B4713 - Caterpillar

active at this time.Results:
OK - A 791-6 diagnostic code or a 792-6 diagnostic code is active at this time. The harness wiring between the connector for the compression brake solenoid and the ECM is OK.Repair: Temporarily connect a new compression brake solenoid to the harness, but do not install the new compression brake solenoid in the engine. Retest the circuit for the compression brake solenoid. Verify that there are no active diagnostic codes for the compression brake solenoid. If there are no active diagnostic codes for the compression brake solenoid, permanently install the new compression brake solenoid.STOP
Not OK - A 791-5 diagnostic code or a 792-5 diagnostic code is active at this time. The ECM did not detect the short at the connector for the compression brake. There is an open between the valve cover connector and the connector for the compression brake solenoid.Repair: Repair the harness between the connector for the compression brake solenoid and the valve cover connector.STOPTest Step 5. Create a Short Circuit at the ECMNote: In order to troubleshoot a 791-05 diagnostic code, you must use the "Compression Brake Low/High Override" on Cat ET. In order to troubleshoot a 792-05 diagnostic code, you must use the "Compression Brake Med/High Override" on Cat ET.
Turn the keyswitch to the OFF position.
Disconnect the J2/P2 ECM connector.
Inspect the terminals on the J2 and P2 ECM connectors for damage.Note: Refer to Figure 3 for pin locations.
Fabricate a jumper wire with a socket on one end.
Remove the supply wire for the suspect compression brake solenoid from the P2 ECM connector. Insert the jumper wire into the P2 ECM connector.
Reconnect the P2 ECM connector.
Create a short between the jumper wire and engine ground.
Turn the keyswitch to the ON position.
Start the override for the compression brake.
Once Cat ET displays the status of the compression brake solenoid, stop the override.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Turn the keyswitch to the OFF position. Remove the wire short.Expected Result:A 791-6 diagnostic code or a 792-6 diagnostic code is active at this time.Results:
OK - A 791-6 diagnostic code or a 792-6 diagnostic code is active at this time. The ECM detected the short.Repair: Check continuity of the supply wire for the suspect compression brake solenoid between the valve cover connector and ECM connector P2. If the wire is open, replace the wire.STOP
Not OK - A 791-5 diagnostic code or a 792-5 diagnostic code is active at this time. The ECM did not detect the short at the ECM connector.Repair: Replace the ECM. Refer to Troubleshooting, "ECM - Replace". Verify that the problem is resolved.STOPTest Step 6. Create an Open Between the Wires of the Suspect Compression Brake Solenoid at the Valve Cover ConnectorNote: In order to troubleshoot a 791-06 diagnostic code, you must use the "Compression Brake Low/High Override" on Cat ET. In order to troubleshoot a 792-06 diagnostic code, you must use the "Compression Brake Med/High Override" on Cat ET.
Turn the keyswitch to the OFF