DB90 - Check EEC-IV Vehicle Harness

- Enter Key On Engine Off Continuous Monitor Diagnostic Test Mode (DTM). Continuous Monitor Diagnostic Test Mode (Wiggle Test)

- Observe Analog Volt/Ohm Meter (VOM) or STAR LED for a fault indication while performing the following:

- Grasp the harness close to the sensor connector. Wiggle, shake or bend a small section of the Electronic Engine Controls (EEC) system vehicle harness while working your way to the dash panel. Also wiggle, shake or bend the EEC system vehicle harness from the dash panel to the Powertrain Control Module (PCM).

- Is a fault indicated?

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

No -- Go to DB91. DB91 - Check PCM and Harness Connectors