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Code 1: Hydraulically Controlled Components

  1. Check ABS fuses. Ensure brake lines are not kinked or leaking. Ensure brake fluid level is okay. Unplug pressure switch connector. Using a DVOM, check for continuity between Black  and Yellow  wires. If continuity does not exist, go to step 2). If continuity exists, use ABS "T" Wrench (07HAA-SG00101) to relieve accumulator line pressure. See Figure . Recheck pressure switch for continuity. If continuity exists, replace pressure switch.
  2. If continuity does not exist, reconnect pressure switch connector. Using ABS "T" Wrench (07HAA-SG00101), loosen maintenance bleeder screw to relieve accumulator line pressure. See Figure . Go to next step.
  3. Raise and support vehicle. Start engine and place transmission into gear. With vehicle running at a minimum of 6 MPH, check pump motor operation. If pump motor operates, go to step 6). If pump motor does not operate, disconnect 21-pin connector from control unit. Check for continuity between Yellow  wire and ground. If continuity exists, repair short circuit in Yellow  wire between control unit and pressure switch. If continuity does not exist, go to next step.
  4. Using a jumper wire, connect Yellow  /Red  wire to ground. Turn ignition on. If pump motor runs, replace faulty control unit. If pump motor does not run, remove pump motor relay and test. Refer to RELAY TEST  under DIAGNOSIS & TESTING. Replace relay if defective. If pump motor relay is okay, connect a jumper wire between White/Blue  and White wires (activates pump motor).
  5. If pump motor does not run, go to step 9). If pump motor runs, check for battery voltage between Yellow  /Black  wire and ground. If battery voltage is not present, repair open circuit in Yellow  /Black  wire between fuse No. 17 and pump motor relay. If battery voltage is present, repair open circuit in Yellow  /Red  wire between control unit and pump motor relay.
  6. If pump motor operated in step 3), check if pump motor operates with an increasingly loud, raspy noise. If motor has a constant soft sound, bleed ABS system. See AIR BLEEDING  under BLEEDING SYSTEM. If motor is noisy, motor should stop after one minute. If motor stops after one minute, go to next step. If motor stops after 2 minutes, replace pressure switch.
  7. Ensure fluid level in ABS "T" wrench graduated reservoir drops and contains no air. See Figure . Allow fluid to stabilize before checking. If fluid level responds correctly, system is okay. Recheck pump motor to ensure problem is not intermittent. If fluid level remains unchanged and air bubbles are present in reservoir tank, go to next step.
  8. Using ABS "T" wrench, check fluid quantity by bleeding accumulator line pressure. See Figure . If fluid quantity in graduated reservoir is more than 160 cc, replace accumulator. If fluid quantity is less than 115 cc, check for modulator inlet solenoid leak or accumulator leak. If fluid level rises, replace modulator.
  9. If pump motor did not run in step 5), check battery voltage between White wire and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White wire between fuse and pump motor relay.
  10. Check for battery voltage between pump motor White/Blue  wire and ground. If battery voltage is present, replace faulty pump motor. If battery voltage is not present, repair open circuit in White/Blue  wire between motor relay and pump motor or open circuit in Black  wire between pump motor and ground. Also check for poor ground connection.
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