Isuzu 4HK1 (Tier 3) Fault Code P0204
Fault Code P0204Open circuit in injection nozzle #4 drive system
Item To Be Detected:
Open/short circuit in electrical wiring No. 4 cylinder injector.
Preconditons When DTC is Set:
1) Main relay power supply voltage is 18V or more.
2) 70 rpm or more
3) DTC P0612, P1262 or P0204 is not detected.
DTC Set Condition:
No injector 4 monitor input signal exists.
Fault Judgement Period:
Approx. 2.4 sec.
Behavior When Trouble Occurs:
1) Intensive engine vibration, rough idling, output lowering, blow up fault.
2) Back-up: injection for cylinder #4 stopped, EGR stopped.
Diagnosis Lamp: ON
Recovery From Failure: *1
Possible Causes:
1) Resistance more or less than specified value between coupling connector terminals.
2) Open circuit or high resistance between ECM and coupling connector.
3) Looseness in the injector terminal nut.
4) Looseness or play in the connection of the coupling connecter.
5) Open circuit or high resistance between injector terminal and coupling connector.
6) Looseness or play in the ECM connector.
7) Bad No. 4 cylinder injector.
8) Bad ECM.
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