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Using a 12 volt test light connected to 12 volts, check the (K137) Boost Pressure Control circuit in the Valve Block NOTE: The test light should not be illuminated. NOTE: The circuit will remain actuated by the controller for 30 seconds. Be certain the actuation is active Is the test light illuminated and bright with the actuation at 100% and not illuminated with the actuation Yes >> Replace the Valve Block Assembly in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 6 6. ENGINE CONTROL MODULE (ECM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Valve Block Assem- Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes >> Repair as necessary. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the Engine Control Module (ECM) in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 951 |