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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Anti-Lock Brake System & Traction Control) >> Diagnosis & Testing >> DTC 323 & DTC 324: Rear Wheel Extrapolation Counter - Wheel Sensor Signal

DTC 323 & DTC 324: Rear Wheel Extrapolation Counter - Wheel Sensor Signal

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. If fault is intermittent, go to step 8). If fault is permanent, check if additional DTCs are present. If only DTCs 323 and 324 are present, go to next step. If DTCs 323 or 324, and DTCs 313 or 314 are present (for same wheel), perform diagnosis starting with step 3) in DTC 313 & 314  test, then go to next step.
  2. Turn ignition off. Disconnect ABS control module. Connect breakout box. Connect ohmmeter between breakout box pins No. 2 and 10 (DTC 323), or between pins No. 1 and 17 (DTC 324). If ohmmeter reads 1040-1160 ohms, go to step 4). If ohmmeter does not read 1040-1160 ohms, go to next step.
  3. Disconnect 4-pin sensor connector located above fuel tank. See WHEEL SENSORS  under REMOVAL & INSTALLATION. For DTC 323, connect ohmmeter between sensor connector terminals No. 1 (Green/Red wire) and No. 3 (Green/Yellow wire). For DTC 324, connect ohmmeter between sensor connector terminals No. 2 (Green/White wire) and No. 4 (Green/Black wire). If ohmmeter reads 1040-1160 ohms, fault was caused by poor terminal contact. Repair as necessary. If ohmmeter does not read 1040-1160 ohms, replace wheel sensor.
  4. Turn ignition off. Reconnect control module. Turn ignition on. Connect voltmeter between breakout box pins No. 8 and 10 (DTC 323), or between pins No. 8 and 17 (DTC 324). If about 2.3 volts are present, go to step 7). If less than 2.3 volts are present, go to next step. If greater than 2.3 volts are present, go to step 6).
  5. Check for a short to ground in wiring between wheel sensor connector terminals and ABS control module. See DTC 323 & 324 TERMINAL IDENTIFICATION table. Refer to wiring diagram for control module terminal identification. Repair as necessary.
    DTC 323 & 324 TERMINAL IDENTIFICATION

    Wheel Sensor Terminal No. Control Module Terminal No.
    DTC 323
    1 2
    3 10
    DTC 324
    2 1
    4 17
  6. Check for a short to voltage in wiring between wheel sensor connector terminals and ABS control module. See DTC 323 & 324 TERMINAL IDENTIFICATION  table. Repair as necessary.
  7. Check wheel bearing for suspect wheel. Repair as necessary. If wheel bearing is okay, check wheel sensor for dirt, damage, or looseness. Repair or replace as necessary. If wheel sensor is okay, ensure pulse wheel is positioned securely, all teeth are intact, and it is not scratched. Repair or replace as necessary. If pulse wheel is okay, check wiring between ABS control module and wheel sensor for intermittent opens, short to ground, or short to voltage. See DTC 323 & 324 TERMINAL IDENTIFICATION  table. If wiring is okay, ensure wheel sensor wiring is not too close to a source of interference. Repair as necessary.
  8. If fault is intermittent, check wheel sensor connector for poor terminal contact. Repair as necessary. Check wheel bearing for excessive play or tightness. Check wiring between control module and sensor for intermittent opens, short to ground, or short to voltage. See DTC 323 & 324 TERMINAL IDENTIFICATION  table. Repair as necessary.
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