HB5 - Cylinder Balance Diagnostic Test Mode (DTM)

Cylinder Balance Test Chart:

The cylinder balance test switches each injector off and on one at a time. A Diagnostic Trouble Code (DTC) corresponds 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 aids in the detection of a weak or non-contributing cylinder. The pinpoint test steps isolate only Electronic Engine Controls (EEC) related problems.

Run the Key On Engine Running (KOER) Self-Test. Quick Test Appendix (Detailed Testing Instructions)

- 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.

- Are there any cylinder balance DTCs requiring service?

Yes -- Go to HB6. HB6 - Check Resistance of Injector(s) and Harness

No -- For Symptoms or DTCs 136, 172, 176: Go to HB10. HB10 - Check HO2S Integrity

For DTCs 137, 173, 177: Go to HB18. HB18 - Check HO2S Signal For Short to Power

For Continuous Memory DTCs 141, 176 Go to HB23. HB23 - Check Continuous Monitor Diagnostic Test Mode (DTM)