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Home >> Ford >> 1991 >> Bronco 4.9 Y, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.9L >> Test DP - Vehicle Speed Sensor (VSS) >> Vehicle Speed Sensor >> Preliminary Instructions (A/T Vehicles)

Preliminary Instructions (A/T Vehicles)

Record and clear Continuous Memory Codes. Warm engine to normal operating temperature. In Low gear, accelerate hard to 25 MPH and coast down to a stop. Shut off engine. Perform KOEO SELF-TEST. Go to step 1).