Trouble Codes No. 7 & 8: Faulty Rear Wheel Speed Sensors
- Unplug ABS ECU connector. See ACCESSING ABS ECU CONNECTOR. Connect a digital voltmeter (AC range) between ABS ECU connector terminals. See TROUBLE CODES NO. 7 & 8 (VOLTAGE) table. See Figure .
- Raise and support vehicle. Rotate each wheel, individually and faster than 2 MPH, and measure voltage. See TROUBLE CODES NO. 7 & 8 (VOLTAGE) table. If reading is 200-300 millivolts, measure sensor and wiring resistance by connecting ohmmeter between ABS ECU connector terminal and ground. See TROUBLE CODES NO. 7 & 8 (CONNECTOR RESISTANCE) table. If resistance is infinity, speed sensor and wiring are good. Replace ABS ECU.
- If reading is not 200-300 millivolts, measure speed sensor wiring resistance by connecting ohmmeter between ABS ECU connector terminal and ground. See TROUBLE CODES NO. 7 & 8 (CONNECTOR RESISTANCE) table. If resistance is infinity, speed sensor wiring is good. Check speed sensor in step 4). If resistance is less than infinity, repair wiring between speed sensor and ABS ECU connector or replace speed sensor.
- Unplug wheel speed sensor connector (in engine compartment). Measure resistance across speed sensor connector terminals. See TROUBLE CODES NO. 7 & 8 (SENSOR RESISTANCE) table. If resistance is less than 800-1300 ohms, replace speed sensor. If resistance is 800-1300 ohms, measure resistance between speed sensor connector terminal and ground. See TROUBLE CODES NO. 7 & 8 (CONNECTOR RESISTANCE) table.
- If resistance is infinity, speed sensor is good. Repair wiring, and retest system. If resistance is less than infinity, check tone wheel(s). Replace speed sensor or repair wiring as necessary. Retest system.
TROUBLE CODES NO. 7 & 8 (VOLTAGE)
| Trouble Code | Connector & Terminal (Wire Color) To Terminal (Wire Color) | |
|---|---|---|
| Legacy | ||
| 7 | (P12) No. 24 (BLU/RED) To No. 26 (GRN/YEL) | |
| 8 | (P12) No. 7 (YEL/RED) To No. 9 (GRN/RED) | |
| SVX | ||
| 7 | (R7) No. 24 (BLU/RED) To No. 26 (GRN/YEL) | |
| 8 | (R7) No. 7 (YEL/WHT) To No. 9 (GRN) | |
TROUBLE CODES NO. 7 & 8 (CONNECTOR RESISTANCE)
| Trouble Code | Connector & Terminal To Ground | ||
|---|---|---|---|
| ABS Control Unit Connector | |||
| Legacy | |||
| 7 | (P12) No. 26 (GRN/YEL Wire) | ||
| 8 | (P12) No. 9 (GRN/RED Wire) | ||
| SVX | |||
| 7 | (R7) No. 26 (GRN/YEL Wire) | ||
| 8 | (R7) No. 9 (GRN Wire) | ||
| Speed Sensor Connector | |||
| Legacy | |||
| 7 (RR) | (P20) No. 1 (BLU/RED Wire) | ||
| 8 (LR) | (P26) No. 1 (YEL/RED Wire) | ||
| SVX | |||
| 7 (RR) | (R18) No. 1 (BLU/RED Wire) | ||
| 8 (LR) | (R36) No. 1 (YEL/WHT Wire) | ||
TROUBLE CODES NO. 7 & 8 (SENSOR RESISTANCE)
| Trouble Code | Terminal To Terminal | |
|---|---|---|
| Legacy | ||
| 7 (RR Sensor) | No. 1 (BLU/RED Wire) & No. 2 (GRN/YEL Wire) | |
| 8 (LR Sensor) | No. 1 (YEL/RED Wire) & No. 2 (GRN/RED Wire) | |
| SVX | ||
| 7 (RR Sensor) | No. 1 (BLU/RED Wire) & No. 2 (GRN/YEL Wire) | |
| 8 (LR Sensor) | No. 1 (YEL/WHT Wire) & No. 2 (GRN Wire) | |