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ABS Warning Light Diagnostics

  1. Ensure battery is fully charged. Turn ignition on. ABS warning light should illuminate, then turn off after 3 seconds. If ABS warning light does not illuminate, check fuse, bulb, and wiring harness. See ABS WARNING LIGHT CIRCUIT  under CIRCUIT TESTS.
  2. Remove short pin from DLC1. DLC1 is located in engine compartment on left side of engine. See Fig 1. Using a fused jumper wire, jumper DLC1 terminals Tc and E1 . If a malfunction is detected, 4 seconds will elapse and ABS warning light will begin to flash a 2-digit DTC. First number of flashes equal first digit in DTC. After a 1.5-second pause, second number of flashes equal second digit in DTC.
  3. If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are flashed, there will be a 4-second pause and all DTCs will repeat. If ABS system is functioning properly, ABS warning light will flash 2 times per second. For DTC definitions, see DTC IDENTIFICATION  table. For diagnostic testing procedures, see DIAGNOSTIC TESTS .
  4. After replacing or repairing components, clear DTCs. If a battery cable was disconnected during repairs, all DTCs will be erased. If battery cable was not disconnected during repairs, see CLEARING DTCS .
DTC IDENTIFICATION

DTC (1) Description (2) Go To
11 ABS Control (Solenoid) Relay - Open Circuit DTC 11 
12 ABS Control (Solenoid) Relay - Shorted Circuit DTC 12 
13 ABS Control (Motor) Relay - Open Circuit DTC 13 
14 ABS Control (Motor) Relay - Shorted Circuit DTC 14 
21 RF Wheel ABS Actuator Solenoid Circuit - Open/Short DTC 21 
22 LF Wheel ABS Actuator Solenoid Circuit - Open/Short DTC 22 
23 Rear Wheels ABS Actuator Solenoid Circuit - Open/Short DTC 23 
31 RF Speed Sensor Signal Circuit DTC 31, 32, 33 & 34 
32 LF Speed Sensor Signal Circuit DTC 31, 32, 33 & 34 
33 RR Speed Sensor Signal Circuit DTC 31, 32, 33 & 34 
34 LR Speed Sensor Signal Circuit DTC 31, 32, 33 & 34 
37 Neither Front Speed Sensor Rotor Missing DTC 37 
37 Tires Of Different Sizes DTC 37 
41 IG Power Source Circuit DTC 41 
43 Malfunction In Deceleration Sensor (4WD) DTC 43 
44 Deceleration Sensor Circuit (4WD) DTC 44 
48 Rear Differential Lock Circuit DTC 48 
49 Stoplight Switch Circuit DTC 49 
51 ABS Pump Motor Locked DTC 51 
ABS Warning Light Always On ABS ECU Malfunction ABS WARNING LIGHT ALWAYS ON
(1) Code displayed by ABS warning light.
(2) See DIAGNOSTIC TESTS 
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Fig 1: Identifying DLC1 Terminals
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