P0107-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT LOWFor a complete wiring diagram Refer to Section 8W.When Monitored:Engine speed between 600 to 3500 RPM. Battery voltage greater than 10 volts.Set Condition:The MAP sensor signal voltage is below 0.08 of a volt 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(F856) 5-VOLT SUPPLY CIRCUIT OPEN(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUITMAP SENSORPCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).Diagnostic Test1.MAP SENSOR VOLTAGE BELOW 0.08 OF A VOLTIgnition on, engine not running.With a scan tool, read the MAP Sensor voltage.Is the voltage below 0.08 of a volt?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2.(F856) 5-VOLT SUPPLY CIRCUITTurn 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 Sensor harness connector.Is the voltage between 4.5 to 5.2 volts?YesGo To 3NoGo To 63.MAP SENSORWith a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.Is the voltage above 4.5 volts?YesReplace the MAP Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44.(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUNDTurn the ignition off.Disconnect the C2 PCM harness connector.Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (K1) MAP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 55.(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUITMeasure the resistance between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short between the (K900) Sensor ground and the (K1) MAP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 86.(F856) 5-VOLT SUPPLY CIRCUIT OPENTurn the ignition off.Disconnect the C1 PCM harness connector.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 (F856) 5-volt Supply 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 (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7.(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDMeasure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 88.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)