DTC P0237 / P0238
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0237: Turbocharger / Supercharger Boost Sensor “A” Circuit Low Output voltage of boost pressure sensor signal circuit is lower than 0.06 V for 5 sec. (1 D/C detection logic) |
•Boost pressure sensor and/or its circuit
•ECM |
|
P0238: Turbocharger / Supercharger Boost Sensor “A” Circuit High Output voltage of boost pressure sensor signal circuit is higher than 4.89 V for 5 sec. (1 D/C detection logic) |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A3: | Boost pressure sensor with IAT sensor-2 ground circuit | 2. | Boost pressure sensor |
| A1: | Boost pressure sensor power supply circuit | B1: | IAT sensor-2 signal circuit | 3. | IAT sensor-2 |
| A2: | Boost pressure sensor signal circuit | 1. | ECM | 4. | To ECT sensor |
DTC Confirmation Procedure
P0237
NOTE:
Check that the following DTC is not detected in this “DTC Confirmation Procedure”.
•Boost pressure sensor (P0238)
1)Run engine at idle speed.
P0238
NOTE:
Check that the following DTC is not detected in this “DTC Confirmation Procedure”.
•Boost pressure sensor (P0237)
1)Run engine at idle speed.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Boost pressure sensor power supply circuit check
1)With ignition “OFF”, disconnect boost pressure sensor with IAT sensor-2 connector.
2)Check for proper terminal connection to boost pressure sensor with IAT sensor-2 connector.
3)If connections are OK, set ignition “ON”.
4)Check that voltage between “A1” and “A3” is approx. 5 V.
Is check result OK?
|
Go to Step 4.
|
Go to Step 3.
|
| 3 |
Boost pressure sensor with IAT sensor-2 ground circuit check
1)Check that voltage between “A1” and ground is approx. 5 V.
Is check result OK?
|
Repair “A3” circuit.
If this DTC is detected again, replace ECM and recheck DTC.
|
Check “A1” circuit.
If defective circuit is found, repair “A1” circuit.
If circuit is OK, replace ECM and recheck DTC.
|
| 4 |
Boost pressure sensor signal circuit check
1)With ignition “OFF”, disconnect “C01” and “E01” connectors from ECM.
2)Check for proper terminal connection to “C01” and “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A2” circuit: less than 1 Ω
•Resistance between “A2” circuit and ground: infinity •Resistance between “A2” circuit terminal and other terminal at boost pressure sensor with IAT sensor-2 connector: infinity •Voltage of “A2” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 5.
|
Repair or replace defective wire harness.
|
| 5 |
Boost pressure sensor check
1)Check boost pressure sensor.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace boost pressure sensor with IAT sensor-2.
|