Circuit/System Testing

NOTE: Circuit/System Testing requires cold start. Do not start vehicle prior to connecting scan tool and preparing to evaluate the condition during engine crank.

Start the engine and observe the Cylinder 1-4 Current Misfire Counters during first 500 engine cycles. The Cylinder 1-4 Current Misfire Counters should not be incrementing.
- If the misfire counters are incrementing on one or more cylinders, verify that the following conditions do not exist:
  - Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis .
  - Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
If all conditions test normal, replace fuel injectors as indicated by high misfire counts.