DESCRIPTION
If any of the following is detected, the ABS warning light remains on.
*: w/ Rear Differential Lock
HINT:
It may not be possible to use the Techstream when the skid control ECU is abnormal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED |
(a) Check the skid control ECU connector connection.
OK:
The connector is securely connected.
NG |
CONNECT CONNECTOR TO ECU CORRECTLY |
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC is output |
B |
B |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
3. |
CHECK CAN COMMUNICATION LINE |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (See page ).
OK:
CAN Bus Check indicates no malfunctions in CAN communication.
NG |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
4. |
READ VALUE USING TECHSTREAM (IG1 VOLTAGE VALUE) |
NG |
GO TO STEP 7 |
|
5. |
CHECK TERMINAL VOLTAGE (EXI3) |
(a) Disconnect the A6 skid control ECU connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
B |
GO TO STEP 9 |
C |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
READ VALUE USING TECHSTREAM (ABS WARNING LIGHT) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
ABS Warning Light |
ABS warning light/ ON or OFF |
OFF |
- |
(f) When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List (See page ).
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
ABS Warning Light |
ABS warning light |
Warning light ON/OFF |
Observe the combination meter. |
Result |
Proceed to |
|
---|---|---|
Data List Display |
Data List Display when Performing Active Test ON/OFF Operation |
|
ON |
Does not change between ON and OFF |
A |
Changes between ON and OFF |
B |
|
OFF |
Does not change between ON and OFF |
A |
Changes between ON and OFF |
B |
A |
REPLACE MASTER CYLINDER SOLENOID |
B |
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
7. |
CHECK TERMINAL VOLTAGE (IG1) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
OK |
REPLACE MASTER CYLINDER SOLENOID |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
9. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT) |
(a) Disconnect the A6 skid control ECU connector.
(b) Disconnect the F47 four wheel drive control ECU connector.
(c) w/ Rear Differential Lock:
Disconnect the D3 rear differential lock detection switch connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A6-40 (EXI3) - Body ground |
Always |
10 kΩ or higher |
Result |
Proceed to |
---|---|
OK (w/o Rear Differential Lock) |
A |
OK (w/ Rear Differential Lock) |
B |
NG |
C |
B |
GO TO STEP 11 |
C |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
10. |
CHECK TERMINAL VOLTAGE (EXI3) |
(a) Disconnect the A6 skid control ECU connector.
(b) Connect the F47 four wheel drive control ECU connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
OK |
REPLACE MASTER CYLINDER SOLENOID |
NG |
REPLACE FOUR WHEEL DRIVE CONTROL ECU |
11. |
INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH) |
(a) Remove the rear differential lock detection switch (See page ).
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG |
REPLACE REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH) |
|
12. |
INSPECT TERMINAL VOLTAGE (EXI3) |
(a) Disconnect the A6 skid control ECU connector.
(b) Connect the F47 four wheel drive control ECU connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
OK |
REPLACE MASTER CYLINDER SOLENOID |
NG |
REPLACE FOUR WHEEL DRIVE CONTROL ECU |
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE NO. 3 FLOOR WIRE
(a) Disconnect the 4 connectors and remove the 3 pieces of tape.
(b) Detach the 4 clamps to remove the No. 3 floor wire.
2. REMOVE REAR BUMPER SIDE BRACKET LH
(a) Remove the clip and 2 screws. ...
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CAUTION / NOTICE / HINT
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