P0203 - Injector Circuit Malfunction Cylinder 3
Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.
Causes:
- Open or shorted wiring harness to the injector #3
- Bad injector #3
- Bad PCM/ECM
Solutions:
- If damage, repair injector wire harness or connector
- Replace injector
- Replace PCM or ECM
P0204 - Injector Circuit Malfunction Cylinder 4
Same info as the P0203 DTC
P0300 - Random/Multiple Cylinder Misfire Detected
When a misfire occurs, engine speed will fluctuate. If the engine speed
fluctuates enough to cause the crankshaft position (CKP) sensor (POS)
signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.
Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted
Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils
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