P0108-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT HIGHFor a complete wiring diagram Refer to Section 8W.When Monitored:Engine speed between 600 to 3500 RPM. Battery voltage greater than 10.37 volts.Set Condition:The MAP sensor signal voltage is greater than 4.92 volts for 3.0 seconds. One trip fault. Three good trips to turn off the MIL. MIL will illuminate and the ETC light will flash if equipped.
Possible Causes(K1) MAP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE(K1) MAP SIGNAL CIRCUIT OPEN(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT(K900) SENSOR GROUND CIRCUIT OPENMAP SENSORPCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).Diagnostic Test1.MAP SENSOR VOLTAGE ABOVE 4.92 VOLTSStart the engine.With a scan tool, read the MAP Sensor voltage.Is the voltage above 4.92 volts?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2.MAP SENSORTurn the ignition off.Disconnect the MAP Sensor harness connector.Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the Sensor harness connector.Ignition on, engine not running.With a scan tool, monitor the MAP Sensor voltage.Is the voltage below 1.0 volt with the jumper wire installed?YesReplace the MAP Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 3Remove the jumper wire before continuing.3.(K1) MAP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGETurn the ignition off.Disconnect the C1 and C2 PCM harness connectors.Ignition on, engine not running.Measure the voltage on the (K1) MAP Signal circuit in the MAP Sensor harness connector.Is the voltage above 5.2 volts?YesRepair the short to battery voltage in the (K1) MAP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44.(K1) MAP SIGNAL CIRCUIT OPENTurn the ignition off.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller
Special Tool #8815 to perform diagnosis.Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 5NoRepair the open in the (K1) MAP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5.(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUITMeasure the resistance between the (K1) MAP Signal circuit and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short between the (F856) 5-volt Supply circuit and the (K1) MAP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 66.(K900) SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (K900) Sensor ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 7NoRepair the open in the (K900) Sensor ground circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7.PCMBefore continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)