Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

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 scan tool Cylinder 1-6 Current Misfire Counters during the first 500 engine cycles.
Verify the scan tool Cylinder 1-6 Current Misfire Counters should not be incrementing.
- If the misfire counters are incrementing on one or more cylinders
1. Ignition OFF.
2. Verify that the following conditions do not exist:
  - Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (LGX)Fuel System Diagnosis (LF4) .
  - Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
  - If a condition exist, repair as necessary.
  - If none of the conditions exist, replace the Q17 Fuel Injectors as indicated by high misfire counts.
- If the misfire counters are not incrementing
All OK.