ABS Warning Light Remains ON [10/2014 - 10/2015]: Procedure
- CHECK CAN COMMUNICATION SYSTEM
- Check if CAN communication system DTCs are output (Refer to DIAGNOSIS SYSTEM [10/2014 - 10/2015]
).
Result
Result Proceed to DTCs are not output. A DTCs are output. B
Result:
B
INSPECT CAN COMMUNICATION SYSTEM
(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )
Result:
A
See step 2
- Check if CAN communication system DTCs are output (Refer to DIAGNOSIS SYSTEM [10/2014 - 10/2015]
).
- CHECK IF BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CONNECTOR IS SECURELY CONNECTED
- Check if the skid control ECU (brake booster with master cylinder assembly) connector is securely connected.
OK
The connector is securely connected.
Result:
NG
CONNECT CONNECTOR TO BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CORRECTLY
Result:
OK
See step 3
- Check if the skid control ECU (brake booster with master cylinder assembly) connector is securely connected.
- CHECK AUXILIARY BATTERY
- Check the auxiliary battery voltage.
Standard Voltage
Tester Connection Condition Specified Condition Auxiliary battery Power switch on (IG) 11 to 14 V Auxiliary battery Power switch on (READY) 11 to 15.5 V
Result:
NG
CHARGE OR REPLACE AUXILIARY BATTERY
Result:
OK
See step 4
- Check the auxiliary battery voltage.
- CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
- Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- Turn the power switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A51-16 (IG1) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
Result:
OK
See step 5
- Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- CHECK HARNESS AND CONNECTOR (GND TERMINAL)
- Turn the power switch off.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A51-28 (GND) - Body ground Always Below 1 Ω A51-27 (GND2) - Body ground Always Below 1 Ω A51-26 (GND3) - Body ground Always Below 1 Ω A51-25 (GND4) - Body ground Always Below 1 Ω A51-24 (GND5) - Body ground Always Below 1 Ω A51-23 (GND6) - Body ground Always Below 1 Ω TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
Result:
OK
See step 6
- Turn the power switch off.
- READ VALUE USING TECHSTREAM (ABS WARNING LIGHT)
- Reconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015]
).ABS/VSC/TRAC
Tester Display Measurement Item/Range Normal Condition Diagnostic Note ABS Warning Light ABS warning light / ON or OFF ON: Warning light on
OFF: Warning light off- - Check the Techstream display condition of the ABS warning light.
Result
Result Proceed to Display of the Data List remains OFF. A Display of the Data List remains ON. B HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the parts (Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] ).
Result:
A
INSPECT METER / GAUGE SYSTEM
(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )
Result:
B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
(Refer to REMOVAL [10/2014 - ] )