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P0687-ECM VOLTAGE ERROR HIGH For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes CHECKING ECM POWER AND GROUNDS ECM INTERMITTENT CONDITION Diagnostic Test 1. CHECK FOR ACTIVE DTC NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may With the scan tool, erase ECM DTCs. NOTE: This DTC may be caused by a charging system problem. Refer to the Service Information and verify Turn the ignition on. With the scan tool, read ECM DTCs. Did this DTC set again? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. CHECK POWER AND GROUNDS Refer to the symptom list and perform the Checking the ECM Power and Ground test. Were any problem found with the ECM powers and grounds? Yes >> Repair as necessary. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Replace and program the Engine Control Module in accordance with the Service Information. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 9 - 1182 ENGINE DIESEL DIAG KJ |