Isuzu 4HK1 (Tier 3) Fault Code P0237

Fault Code P0237 Boost pressure sensor fault (low voltage fault)

Item To Be Detected:
Open/short circuit/breakage of sensor or harness

Preconditons When DTC is Set:
1) Key switch input voltage is 18V or more.
2) DTC P1630 or P1634 is not detected.

DTC Set Condition:
Boost pressure sensor voltage is less than 0.1V.

Fault Judgement Period:
Approx. 3 sec.

Behavior When Trouble Occurs:
1) Operationality is affected.
2) Back-up: Specified back-up value (depending on the machine manufacturer)

Diagnosis Lamp: ON

Recovery From Failure: *2

Possible Causes:
1) Manifold absolute pressure sensor more or less than specified value.
2) Looseness or play in the connection between ECM and coupling connector.
3) Open circuit of high resistance between ECM and boost pressure sensor.
4) Short circuit to boost pressure sensor ground circuit.
5) Short circuit to ground between ECM ad boost pressure sensor.
6) Bad ECM.
7) Boost pressure sensor display showing error.
8) Looseness or play in the connection of the boost pressure sensor and the ECM connector.

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