Sized for Print U1008-LIN 1 BUS. For a complete wiring diagram refer to Diagrams/Electrical. When Monitored: Continuously while the system is active.

Transcription

1 U1008-LIN 1 BUS For a complete wiring diagram refer to Diagrams/Electrical When Monitored: Continuously while the system is active. Set Condition: The ECM is receiving a LIN bus error message. 1/7

2 Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Diagnostic Test 1. DTC IS ACTIVE Record all DTC information. With a scan tool, Clear DTCs. Start the engine and allow it to reach normal operating temperature. Monitor the scan tool for at least 2 minutes. Is the status Active for this DTC? Go To 2 2/7

3 Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Component Tests and General Diagnostics\Checking for an Intermittent DTC 2. GLOW PLUG MODULE Turn the ignition off. Disconnect the Glow Plug Module harness connector. With a scan tool, Clear DTCs. Monitor the scan tool for at least 2 minutes. NOTE: If the Glow Plug Module LIN bus circuit is shorted internally, the LIN Bus DTC will not set with the module disconnected. If the LIN bus is shorted to voltage or ground, or the Generator is internally shorted, this DTC will remain Active. Is the status Active for this DTC? Go To 3 Replace the Glow Plug Module. 3. GENERATOR Turn the ignition off. Connect the Glow Plug Module harness connector. Disconnect the Generator harness connector. With a scan tool, Clear DTCs. 3/7

4 Monitor the scan tool for at least 2 minutes. NOTE: If the Generator LIN bus circuit is shorted internally, the LIN Bus DTC will not set with the Generator disconnected. If the LIN bus is shorted to voltage or ground, this DTC will remain Active. Is the status Active for this DTC? Go To 4 Replace the Generator. 4. (D509) LIN BUS CIRCUIT SHORTED TO GROUND 4/7

5 Turn the ignition off. Disconnect the Glow Plug Module harness connector. Disconnect the Engine Control Module (ECM) harness connector. Measure the resistance between ground and the (D509) LIN Bus circuit in the Generator harness connector. Is the resistance above 1000 ohms? Go To 5 Repair the (D509) LIN Bus for a short to ground. 5. (D509) LIN BUS CIRCUIT SHORTED TO VOLTAGE 5/7

6 Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector. Measure the voltage of the (D509) LIN Bus circuit in the Generator harness connector. Is there any voltage present? Repair the (D509) LIN Bus for a short to voltage. Go To 6 6. ENGINE CONTROL MODULE (ECM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Glow Plug Module and the Engine Control Module (ECM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Refer to any Technical Service Bulletins that may apply. Were any problems found? Repair as necessary. 6/7

7 Replace the Engine Control Module (ECM). 7/7