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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 321 & DTC 322: Front Wheel Extrapolation Counter - Wheel Sensor Signal

DTC 321 & DTC 322: Front 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 321 and 322 are present, go to next step. If DTCs 313 or 314, and DTCs 321 and 322, or DTCs 311 and 312 are present (for same wheel), perform diagnosis starting with step 3) in DTC 311 & 312  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 321), or between pins No. 1 and 17 (DTC 322). If ohmmeter reads 1040-1160 ohms, go to step 4). If ohmmeter does not read 1040-1160 ohms, go to next step.
  3. Remove wheel for better access. Clean around wheel sensor connector 2-pin connector. Disconnect 2-pin connector. Connect ohmmeter between connector terminals No. 1 and 2. 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 321), or between pins No. 8 and 17 (DTC 322). 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 321 & 322 TERMINAL IDENTIFICATION table. Refer to wiring diagram for control module terminal identification. Repair as necessary.
    DTC 321 & 322 TERMINAL IDENTIFICATION

    Wheel Sensor Terminal No. Control Module Terminal No.
    DTC 321
    1 11
    2 4
    DTC 322
    1 18
    2 3
  6. Check for a short to voltage in wiring between wheel sensor connector terminals and ABS control module. See DTC 321 & 322 TERMINAL IDENTIFICATION  table. Repair as necessary.
  7. Check wheel bearing at suspect wheel. Front wheel bearings are not adjustable. 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 321 & 322 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 321 & 322 TERMINAL IDENTIFICATION  table. Repair as necessary.
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