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Test Procedure

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1988 Ford Ranger, 1988 Ford RV Cutaway, 1988 Ford Pickup, 1988 Ford F-Super Duty, and 1988 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
  1. Deactivate SELF-TEST (disconnect jumper wire). Start engine and run it at 2000 RPM for 2 minutes to warm up HEGO sensor. Turn engine off and wait 10 seconds.
  2. Start engine. Insert jumper to activate SELF-TEST. The engine ID code will be displayed. On vehicles equipped with Brake On/Off switch (BOO) the brake pedal MUST be depressed and released AFTER the ID code (within 1-2 seconds). On vehicles equipped with Power Steering Pressure Switch, the steering wheel MUST be turned one-half turn and released AFTER the ID code.
  3. If a Dynamic Response code occurs, briefly depress accelerator pedal to wide open throttle (WOT). A Dynamic Response code is a code 1 or 10 displayed after the Engine ID code and before the Engine Running codes. DO NOT  depress throttle during test unless a Dynamic Response code occurs. The ENGINE RUNNING SELF-TEST service codes will then be displayed. Observe and record all codes.
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