P0238-TURBO BOOST PRESSURE SENSOR CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The (K37) Boost Pressure Sensor Signal circuit voltage is above 4.85 volts for 0.5 second.

Possible Causes

INTERMITTENT DTC

(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K656) BOOST PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(K656) BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

BOOST 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 DTC P0652 or P0653 is present with this DTC, diagnose DTCs P0652 or P0653 before diagnosing this DTC.

Is the status Active for this DTC?

Yes

Go To 2

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

2.(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K854) Boost Pressure Sensor 5 Volt Supply circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 3

3.(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

NOTE: The jumper wire should still be in place.

Is there any voltage present?

Yes

Repair the (K37) Boost Pressure Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 4

4.(K656) BOOST PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

NOTE: The jumper wire should still be in place.

Is there any voltage present?

Yes

Repair the (K656) Boost Pressure Sensor Ground circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 5

5.BOOST PRESSURE SENSOR

NOTE: The scan tool should display a Boost 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

Replace the Intake Air Temp/Boost Pressure Sensor in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 6

6.(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 10.0 ohms?

Yes

Go to 7

Repair the (K37) Boost Pressure Sensor Signal circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

7.(K656) BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 10.0 ohms?

Yes

Go to 8

Repair the (K656) Boost Pressure Sensor Ground circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

8.ENGINE CONTROL MODULE (ECM)

Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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