H90 - Check Continuous Monitor Diagnostic Test Mode

- Key "OFF".

- Verify engine at operating temperature.

- Start engine and run at 2000 rpm for two minutes.

- With engine rpm at idle enter Engine Running Continuous Monitor (DTM). Continuous Monitor Diagnostic Test Mode (Wiggle Test)

- Observe Analog Volt/Ohm Meter (VOM) or STAR LED for indication of fault.

- Wiggle, shake or bend a small section of the Electronic Engine Controls (EEC) harness while working your way from the Heated Oxygen Sensor (HO2S) to the Powertrain Control Module (PCM).

- Wiggle, shake or bend a small section of the EEC harness while working your way from the HO2S GND to the PCM.

- Is a fault indicated?

Yes -- Isolate fault and service as necessary. Remove breakout box. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Remain in Engine Running Continuous Monitor Test Mode. Go to H91. H91 - Continuous Monitor DTM Test Drive Check