Isuzu 4HK1 (Tier 3) Fault Code P0117

Fault Code P0117 PID 23 Engine coolant temperature sensor fault (low voltage fault)

Item To Be Detected:
Short circuit in sensor or harness

Preconditons When DTC is Set:
1) Key switch input voltage is 18V or more.
2) DTC P1630 or P1633 is not detected.

DTC Set Condition:
Engine coolant temperature sensor voltage is less than 0.1 V.

Fault Judgement Period:
Approx. 4 sec.

Behavior When Trouble Occurs:
1) Start ability deteriorates at low temperatures or black smoke emission is possible, output lowering depending on conditions.
2) Back-up: Specified back-up value (depending on the machine manufacturer)

Diagnosis Lamp: ON

Recovery From Failure: *2

Possible Causes:
1) Engine coolant temperature sensor more or less than specified value.
2) Looseness or play between the ECM and coupling connector connection.
3) Short circuit to the ECT sensor ground circuit.
4) Short circuit to ground.
5) Bad ECT sensor.
6) Bad ECM.
7) Engine coolant temperature display showing error value.

Isuzu 4HK1 (Tier 3) Fault Code P0112

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