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P1628-SENSOR REFERENCE VOLTAGE 2 CIRCUIT ERRATIC (CONTINUED) 5. (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-volt Sup- Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-volt Supply circuit at the Is the voltage above 0 volts? Yes >> Repair the short to battery voltage in the (F856) Auxiliary 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 6 6. (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Reconnect all the sensors that were disconnected in the previous step CAUTION: Do not probe the PCM harness connectors. Probing It may be necessary to perform this test from every sensor that uses Is the resistance below 5.0 ohms? Yes >> Go To 7 No >> Repair the open in the (F856) Auxiliary 5-volt Supply cir- cuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 795 |