2007 Compass Patriot MK Factory Service Manual 9 - ENGINE

P0108-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W



Possible Causes
  
INTERMITTENT DTC
  
(K857) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
  
(K1) MAP SIGNAL CIRCUIT SHORTED TO VOLTAGE
  
(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K857) 5 VOLT SUPPLY CIRCUIT
  
(K1) MAP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
  
(K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE
  
MAP SENSOR
  
POWERTRAIN CONTROL MODULE (PCM)
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)



Diagnostic Test

1. DTC IS ACTIVE

Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.


With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes


No

2. (K857) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE



Turn the ignition off.
Disconnect the Manifold Absolute Pressure Sensor connector.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (K857) 5 Volt Supply circuit in the Manifold Absolute Pressure Sensor harness connector.

Is there any voltage present?

Yes


No

3. (K1) MAP SIGNAL CIRCUIT SHORTED TO VOLTAGE



Measure the voltage of the (K1) MAP Signal circuit in the Manifold Absolute Pressure Sensor harness connector.

Is there any voltage present?

Yes


No

4. (K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K857) 5 VOLT SUPPLY CIRCUIT



Measure the resistance between the (K1) MAP Signal circuit and the (K857) 5 Volt Supply in the Manifold Absolute Pressure Sensor harness connector.

Is the resistance below 100 ohms?

Yes


No

5. (K1) MAP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE



Turn the ignition off.
Measure the resistance of the (K1) MAP Signal between the Manifold Absolute Pressure Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes


No

6. (K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE



Measure the resistance of the (K900) Sensor Ground circuit between the Manifold Absolute Pressure Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes


No

7. MAP SENSOR



Turn the ignition off.
Connect the Powertrain Control Module (PCM) connector.
Connect a jumper wire between the (K900) Sensor Ground circuit and the (K1) MAP Signal circuit in the Manifold Absolute Pressure Sensor harness connector.
Turn the ignition on.
With the scan tool, read the Manifold Absolute Pressure Sensor signal voltage.

Is the voltage below 1.0 volt with the jumper wire in place?

Yes


No

8. POWERTRAIN CONTROL MODULE (PCM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Manifold Absolute Pressure Sensor and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes


No