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Troubleshooting DTC 1-4: Pressure Switch The ABS control unit momentarily activates the outlet solenoid valve and counts the number of times that the pressure switch signal is ON during the initial diagnosis. When the ABS control unit does not detect the pressure switch OFF signal at all when the engine is started and stopped repeatedly, it keeps the ABS indicator light on. The count of the pressure switch ON signals is reset when the ABS control unit detects the pressure switch OFF signal. Possible causes: Short to body ground between the ABS control unit and pressure switch Pressure switch stuck ON Faulty ABS control unit MODULATOR UNIT 14P CONNECTOR Wire side of female terminals Visually inspect the modulator (Pressure switch stuck ON) ABS CONTROL UNIT 26P CONNECTOR NOTE: Check with the modulator unit HP Repair short to body ground in Wire side of female terminals Check for loose ABS control unit unit and recheck. Is there continuity? Check for a short to body ground in the P-SW circuit: 1. Disconnect the ABS control unit 26P connector. 2. Check for continuity between terminal No. 19 and body ground. Check the pressure switch: 1. Relieve system pressure (see ). 2. Disconnect the modulator unit 14P connector. 3. Check for continuity between terminals No. 4 and No. 11. Is there continuity? With engine running, ABS indi- ), DTC 1-4 is indicated. Main Menu Table of Contents |