Z12

WARNING: USE CAUTION WHEN PERFORMING ANY OF THE TEST STEPS. ALWAYS BE AWARE OF HANDS, CLOTHING OR TOOLS NEAR COOLING FANS, ENGINE DRIVE BELTS OR HOT SURFACES.

- Key Off.

- Access PIDs based on information from the pinpoint test or from the Intermittent Symptom Chart. Intermittent Symptom Charts

- Go to the area of the suspected wiring or component fault.

- Key On, Engine Running.

- Lightly tap on component while viewing PID values. Also wiggle and pull each component wire (Signal, Signal Return and VREF, if applicable) at the component.

- Look for abrupt changes in PID values. Compare the actual values to the Diagnostic Reference Values. Normal Scan Data Values - Includes Pids

- Are any PID values out of range or drop out and back Into range?

Yes -- Possible wiring or component problem. CHECK each wire for corrosion, bent or loose terminals and wire terminal crimps. SERVICE as necessary. Otherwise, REPLACE component. VERIFY repair. If unable to verify, REINSTALL original part, and GO to Z13. Z13

No -- GO to Z13 for PCM wiring check. Z13