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ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS TSB Revision ANTI-LOCK BRAKING SYSTEM(ABS) 35B-9 CIRCUIT OPERATION • A toothed ABS rotor generates a voltage pulse as • The amount of voltage generated at each wheel • The wheel speed sensors transmit the frequency • The ABS hydraulic unit modulates the amount of ABS DTC SET CONDITIONS • DTCs 11, 12, 13, 14 are output when signal is not • Open circuit is not found but no input is received • Sensor output drops due to a malfunctioning TROUBLESHOOTING HINTS (The most likely • Malfunction of the wheel speed sensor • Damaged wiring harness or connector • Malfunction of the hydraulic unit (Integrated with DTC 21, 22, 23, 24 • Malfunction of the wheel speed sensor • Damaged wiring harness and connector • Malfunction of the hydraulic unit (Integrated with • Malfunction of the ABS rotor • Malfunction of the wheel bearing • Excessive clearance between the sensor and DIAGNOSIS Required Special Tool: • MB991223: Harness Set STEP 1. Check the wheel speed sensor installation. the front knuckle or the rear knuckle? AC003858 GLOVE BOX AB CONNECTOR: C-13 AC003859AB CONNECTORS: D-10, D-12, D-15 D-10 D-15 D-12 AC000939 FRONT WHEEL REAR WHEEL AB |