Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0237: Turbocharger Boost Sensor Circuit Low VoltageDTC P0238: Turbocharger Boost Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
5-Volt Reference Circuit | P0192, P02E8, P0409, P0462, P0642, P2453, P2454, P2564 | P0237 | -- |
Signal Circuit | P0237 | P0237 | P0238 |
Ground Circuit | -- | P0238 | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Boost Pressure Sensor Parameter Normal Range: 00-255 kPa | |||
Boost Pressure Sensor 5-Volt Reference Circuit | 33 kPa | 33 kPa | -- |
Boost Pressure Sensor Signal Circuit | 33 kPa | 33 kPa | 255 kPa |
Boost Pressure Sensor Ground Circuit | 33 kPa | 255 kPa | -- |
Circuit/System Description
The engine control module (ECM) supplies 5 volts to the boost pressure sensor on the 5-volt reference circuit. The ECM also provides a ground on the low reference circuit. The boost pressure sensor provides a signal to the ECM on the boost pressure signal circuit which is relative to the pressure changes in the manifold. The ECM should detect a low signal voltage at a low boost pressure, such as low engine load. The ECM should detect high signal voltage at a high boost pressure, such as high engine load. The ECM monitors the boost pressure sensor signal for voltage outside the normal range of the boost pressure sensor.
Conditions for Running the DTC
P0237
| • | DTCs P0238, P02E7, P02E8, P0642, P0643, P2228 and P2229 are not set. |
| • | The battery voltage is between 10-16 volts. |
| • | The ignition is ON for longer than 2 seconds. |
P0238
| • | DTCs P0237, P0642, and P0643 are not set. |
| • | The battery voltage is between 10-16 volts. |
| • | The ignition is ON for longer than 2 seconds. |
Conditions for Setting the DTC
P0237
The ECM detects that the boost pressure sensor signal voltage is less than 0.1 volt.
P0238
The ECM detects that the boost pressure sensor signal voltage is more than 4.8 volts.
Action Taken When the DTC Sets
DTCs P0237 and P0238 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0237 and P0238 are Type A DTCs.
Diagnostic Aids
An incorrectly installed turbo charger boost sensor will cause this DTC to set.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
Important: If DTC P02E7, P02E8, P0642, P0643, P2228 and P2229 are set, test and repair those DTCs first.
| • | Damaged components |
| • | Loose or improper installation |
Circuit/System Testing
Important: Perform the Circuit/System Verification before proceeding with Circuit/System Testing.
P0237
- Turn ON ignition, with the engine OFF.
- Disconnect the turbocharger boost sensor connector, connect a DMM between the turbocharger sensor 5-volt reference circuit and ground, and measure the voltage
- Observe the turbocharger boost parameter with a scan tool.
- Connect a fused jumper between the turbocharger boost sensor signal circuit and the low reference circuit and observe the boost pressure parameter with a scan tool.
| ⇒ | If the voltage is not 0-4.75 volts, test for an open or short to ground in the 5-volt reference circuit. If the circuits test normal, replace the control module. |
| ⇒ | If boost pressure is less than 33 kPa (4.7 psi), test the turbocharger boost sensor signal circuit for a short to ground or an open. If the circuits test normal, replace the turbocharger boost sensor. |
| ⇒ | If boost pressure goes to 255 kPa (37 psi), replace the turbocharger boost sensor. |
| ⇒ | If boost pressure does not change, replace the control module. |
P0238
- Turn ON ignition, with the engine OFF.
- Disconnect the turbocharger boost sensor connector, connect a DMM between the turbocharger sensor 5-volt reference circuit and ground, and measure the voltage
- Observe the turbocharger boost parameter with a scan tool.
- Connect a fused jumper between the turbocharger boost sensor signal circuit and the low reference circuit and observe the boost pressure parameter with a scan tool.
| ⇒ | If the voltage is not 0-4.75 volts, test for an open or short to ground in the 5-volt reference circuit. If the circuits test normal, replace the control module. |
| ⇒ | If boost pressure is more than 250 kPa (36.3 psi), test the turbocharger boost sensor signal circuit for a short to ground or an open. If the circuits test normal, replace the turbocharger boost sensor. |
| ⇒ | If boost pressure is less than 33 kPa (4.7 psi), replace the turbocharger boost sensor. |
| ⇒ | If boost pressure does not change, test the signal circuit and the low reference circuit for an open. If the circuits test normal, replace the control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
