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 DTCNOTE: 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.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10 seconds at a time.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
- Go To2
No
- 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
Turn the ignition off.
Disconnect the Inlet Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Inlet Pressure Sensor Signal circuit.
Is the voltage above 1.0 volt?
Yes
- Go To3
No
- Go To4
3. INLET PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage between ground and the Inlet Pressure Sensor Signal circuit.
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).
No
- 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
Measure the voltage between ground and the Inlet Pressure Sensor Ground circuit.
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).
No
- Go To5
5. INLET PRESSURE SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the Inlet Pressure Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
- Go To6
No
- 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.
Turn the ignition on.
Measure the voltage of the Inlet Pressure Sensor Signal circuit by back probing ECM harness connector.
Is the voltage above 4.85 volts?
Yes
- Replace the Inlet Pressure Sensor.
- Perform ROAD TEST VERIFICATION - VER-2.
No
- 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).