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P0642-SENSOR REFERENCE VOLTAGE 1 CIRCUIT LOW (CONTINUED) 4. 5-VOLT SENSOR SHORTED TO GROUND Measure the voltage on the (F855) Primary 5-volt Supply circuit at the CAUTION: You must Turn the Ignition OFF when disconnecting NOTE: Reconnect all the Sensors and clear all trouble codes Does the voltage increase above 4.5 volts when disconnecting Yes >> Replace the Sensor that causes the (F855) Primary 5-volt Supply circuit voltage to increase when disconnected. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 5 5. PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal Were there any problems found? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 720 ENGINE ELECTRICAL DIAGNOSTICS WK |