Testing Precautions
WARNING: This page is about a different car, the 1994 Mercury Grand Marquis, 1994 Lincoln Town Car, and 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
If Diagnostic Trouble Code (DTC) 18, 19 or 22-29 is stored in ECU, no other DTCs will be stored until all these have been serviced and cleared. ECU cannot store DTCs with same first digit (25 and 26). Lowest number DTC (25) will be stored first. DTCs must be serviced in order received and cleared before continuing. Drive vehicle at about 25 MPH and check for additional DTCs. Solenoid valve DTCs will override all other DTCs stored. If no DTCs are stored, system has passed self-test. If DTCs appear, refer to ON-BOARD SELF-TEST DIAGNOSTIC TROUBLE CODE (DTC) INDEX table under ON-BOARD SELF-TESTS. If BRAKE warning light is on or comes on intermittently, go to WARNING LIGHT SYMPTOM SEQUENCE CHART. See Figure .