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• When Monitored: • Set Condition: Possible Causes (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE (F856) 5-VOLT SUPPLY CIRCUIT OPEN (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND (K1) MAP SIGNAL CIRCUIT OPEN (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND (K1) MAP SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND MAP SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read DTCs. Is the DTC active at this time. Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Is the voltage between 4.5 to 5.2 volts? Yes >> Go To 3 No >> Go To 7 9 - 116 ENGINE ELECTRICAL DIAGNOSTICS LX |