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P2503-CHARGING SYSTEM OUTPUT LOW (CONTINUED) 3. FIELD DRIVER CIRCUIT SHORTED TO GROUND Disconnect the ECM harness connectors. NOTE: Check connectors - Clean/repair as necessary. Is the resistance greater than 100 ohms? Yes >> Go To 4 No >> Repair the generator field driver circuit shorted to ground. Perform POWERTRAIN VERIFICATION TEST VER - 1 4. ECM Measure and record the voltage between battery positive circuit of the Reconnect the ECM connectors. Use the scan tool to measure and record battery voltage. Compare the voltage reading from the voltmeter with that of the scan Are the readings within 3 volts of each other? Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO- No >> Replace and program the ECM in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 1 9 - 1454 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |