| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Brake | Section: Brake Control/Dynamic Control System | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000OSE015X |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
ABS Warning Light Remains ON |
DESCRIPTION
If any of the following conditions are detected, the ABS warning light remains on:
- The ECU connectors are disconnected from the skid control ECU.
- There is a malfunction in the skid control ECU internal circuit.
- There is an open or short in the wire harness between the combination meter and the skid control ECU.
HINT:
The Techstream may not be used when there is a malfunction in the skid control ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
-
When replacing the VSC actuator assembly, perform zero point calibration
.
- Make sure the skid control ECU is not in test mode before proceeding.
- Before using these procedures, first check other DTCs which may cause the ABS warning light to remain on.
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if the CAN communication system DTC is output
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is not output |
A |
|
DTC is output |
B |
|
|
2. |
CHECK CONNECTOR CONNECTION CONDITION |
(a) Check the skid control ECU connector condition.
OK:
The connector is securely connected.
|
|
3. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND) |
|
(a) Disconnect the A19 ECU connector. |
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A19-9 (IG1) - A19-1 (GND1) |
Ignition switch ON |
11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A19-1 (IGND1) - Body ground |
Always |
Below 1 Ω |
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (ABS WARNING LIGHT) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Select Active Test mode and operate the ABS warning light using the Techstream.
ABS/VSC/TRAC
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
ABS Warning Light |
ABS warning light |
Warning light ON/OFF |
Observe combination meter |
(e) Check that the ABS warning light turns on and off in the combination meter when using the Techstream.
OK:
The ABS warning light turns ON and OFF in accordance with the Techstream operation.
HINT:
When the ABS warning light remains illuminated, an open in the wire harness of the combination meter or abnormalities in the meter circuit should be considered.
|
|
|