P012D-TURBO INLET AIR PRESSURE SENSOR CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W



Possible Causes
INTERMITTENT DTC
(K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K68) INLET AIR PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K901) INLET AIR PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
(K68) INLET AIR PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K901) INLET AIR PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE
INLET AIR PRESSURE SENSOR
ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



Diagnostic Test

1. DTC IS ACTIVE

NOTE: If any Sensor Reference or Sensor Supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.


Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Monitor the scan tool for at least two minutes.
Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
Start the engine.
Allow the engine to reach normal operating temperature.
With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes


No

2. (K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE



Turn the ignition off.
Disconnect the Inlet Air Pressure Sensor harness connector.
Disconnect the Engine Control Module (ECM) harness connector.
Remove the ASD Relay from the TIPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.
Turn the ignition on.
Measure the voltage of the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit in the Inlet Air Pressure Sensor harness connector.

Is there any voltage present?

Yes


No

3. (K68) INLET AIR PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE


NOTE: The jumper wire should still be in place.


Measure the voltage of the (K68) Inlet Air Pressure Sensor Signal circuit in the Inlet Air Pressure Sensor harness connector.

Is there any voltage present?

Yes


No

4. (K901) INLET AIR PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE


NOTE: The jumper wire should still be in place.


Measure the voltage of the (K901) Inlet Air Pressure Sensor Ground circuit in the Inlet Air Pressure Sensor harness connector.

Is there any voltage present?

Yes


No

5. INLET AIR PRESSURE SENSOR



Turn the ignition off.
Remove the jumper wire and install the ASD Relay.
Connect the Engine Control Module (ECM) harness connector.
Connect a jumper wire between the (K901) Inlet Air Pressure Sensor Ground circuit and the (K68) Inlet Air Pressure Sensor Signal circuit in the Inlet Air Pressure Sensor harness connector.
Turn the ignition on.
With the scan tool, Clear DTCs.
With the scan tool, select View DTCs.

NOTE: The scan tool should display an Inlet Air Pressure Sensor low voltage or short to ground DTC with the jumper wire in place.



Does the scan tool display the DTC(s) as described above?

Yes


No

6. (K68) INLET AIR PRESSURE SENSOR SIGNAL OPEN OR HIGH RESISTANCE



Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance of the (K68) Inlet Air Pressure Sensor Signal between the Inlet Air Pressure Sensor harness connector and the Engine Control Module (ECM) harness connector.

Is the resistance below 10.0 ohms?

Yes


No

7. (K901) INLET AIR PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE



Measure the resistance of the (K901) Inlet Air Pressure Sensor Ground circuit between the Inlet Air Pressure Sensor harness connector and the Engine Control Module (ECM) harness connector.

Is the resistance below 10.0 ohms?

Yes


No

8. ENGINE CONTROL MODULE (ECM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Inlet Air Pressure Sensor and the Engine Control Module (ECM).
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