Diagnostic Aids

Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal connection. Inspect wiring harness for damage. If harness appears to be okay, disconnect PCM and turn ignition on. Connect DVOM to PCM harness connector at MIL driver circuit while moving connectors and harnesses. A change in voltage reading indicates location of fault. If problem can not be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set. This may help reveal how often malfunction occurs, and may help in diagnosis. The following PCM pins are controlled by ODMs:

• A13 MIL Lamp.
• A14 Rear Defogger.
• B15 Up Shift.
• B14 A/C Clutch.
• A15 EVAP Canister Vent Solenoid.
• B16 EVAP Canister Purge Valve.
• A1 Low Fuel.
• C10 Tachometer.
• C11 Fuel Gauge.
• C13 Fan Low.
• C12 Fan High.