P1186-INLET PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The Inlet Pressure Sensor signal is above 4.75 volts for 2.0 seconds.

Possible Causes

INTERMITTENT CONDITION

INLET PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

INLET PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

INLET PRESSURE SENSOR GROUND CIRCUIT OPEN

INLET PRESSURE SENSOR

ENGINE CONTROL MODULE (INTERNAL)

ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)

Diagnostic Test

1.CHECKING FOR CURRENT DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

NOTE: Ensure all turbocharger inlet and outlet tubes are connected properly, without damage and restriction before continuing with this test.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.MEASURE THE INLET PRESSURE SENSOR SIGNAL CIRCUIT VOLTAGE

Is the voltage above 1.0 volt?

Yes

Go To3

Go To4

3.INLET PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the Inlet Pressure Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.INLET PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the Inlet Pressure Sensor Ground circuit for a short to voltage. The ECM will need to be checked for proper operation before the repair is completed. A short to voltage on a ground circuit can damage the ECM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To5

5.INLET PRESSURE SENSOR GROUND CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To6

Repair the Inlet Pressure Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

6.INLET PRESSURE SENSOR

NOTE: Ensure all harness connectors are connected.

Is the voltage above 4.85 volts?

Yes

Replace the Inlet Pressure Sensor.
Perform ROAD TEST VERIFICATION - VER-2.

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).