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Home >> Geo >> 1994 >> Tracker Base, 1.6 U, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnosis >> Code 4, Limit Valve Reset Switch Closed

Code 4, Limit Valve Reset Switch Closed

  1. Turn ignition off. Disconnect RWAL EBCM connector. Measure resistance between EBCM harness connector terminal No. 4 (Blue wire) and ground.
  2. If resistance reading is greater than 10,000 ohms, check RWAL EBCM connections. If connections are okay, replace RWAL EBCM. See RWAL ELECTRONIC BRAKE CONTROL MODULE  under REMOVAL & INSTALLATION. If resistance reading is less than 10,000 ohms, disconnect pressure limit valve connector.
  3. Measure resistance between pressure limit valve reset switch connector (switch side) terminal No. 2 (Blue wire) and No. 4 (Black wire). If resistance is less than 10,000 ohms, replace pressure limit valve.
  4. If resistance is greater than 10,000 ohms, measure resistance between pressure limit valve connector (harness side) terminal No. 2 (Blue wire) and ground. If resistance is less than 100,000 ohms, repair short to ground in Blue wire of harness.
  5. If resistance is greater than 100,000 ohms, firmly depress brake pedal. Measure resistance between limit valve connector (valve side) terminals No. 2 (Blue wire) and No. 4 (Black wire). If resistance is less than 10,000 ohms, replace pressure limit valve. If resistance is greater than 10,000 ohms, replace RWAL EBCM. See RWAL ELECTRONIC BRAKE CONTROL MODULE  under REMOVAL & INSTALLATION.
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