HA6 - Diagnostic Test Mode (DTM): SFI Engines

Cylinder Balance Test Chart:

The cylinder balance test switches each injector OFF and ON one at a time. Diagnostic Trouble Codes (DTC) correspond to the cylinder number (i.e., DTC 30 indicates a problem with cylinder No. 3, a DTC 90 indicates a pass). The Cylinder Balance test is designed to aid in the detection of a weak or non-contributing cylinder. The pinpoint test steps are designed to isolate only Electronic Engine Controls (EEC) related problems.

- Run the Engine Running Self-Test. Key ON Engine Running (KOER) Self-Test

- After the last repeated code, wait 5-10 seconds.

- "Goose" throttle lightly (not wide-open-throttle).

- Cylinder balance test will be performed. Time of test is 2-3 minutes.

- Is code 90 present?

Yes -- Go to Ignition Section.

No -- Go to HA8. HA8 - Check Resistance of Injector(s) and Harness - SFI Engines