Toyota 4Runner: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
NOTICE:
When replacing the master cylinder or sensor, turn the ignition switch off.
Vehicle Stability Control System|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
ABS, BA and/or EBD does not operate |
Check for DTCs again and make sure that no DTC is output |
|
|
IG power source circuit |
|
|
|
Front speed sensor circuit |
|
|
|
Rear speed sensor circuit |
|
|
|
Master cylinder pressure sensor (check master cylinder pressure sensor by performing test mode inspection) |
|
|
|
Check hydraulic brake booster with Techstream. If abnormal, check hydraulic circuit for leakage. |
|
|
|
If symptoms still occur even after above circuits in suspected areas are inspected and proved to be normal, replace master cylinder solenoid |
|
|
|
ABS, BA and/or EBD does not operate efficiently |
Check for DTCs again and make sure that no DTC is output |
|
|
Front speed sensor circuit |
|
|
|
Rear speed sensor circuit |
|
|
|
Stop light switch circuit |
|
|
|
Master cylinder pressure sensor (check master cylinder pressure sensor by performing test mode inspection) |
|
|
|
Check hydraulic brake booster with Techstream. If abnormal, check hydraulic circuit for leakage. |
|
|
|
If symptoms still occur even after above circuits in suspected areas are inspected and proved to be normal, replace master cylinder solenoid |
|
|
|
VSC and/or TRAC does not operate |
Check for DTCs again and make sure that no DTC is output |
|
|
IG power source circuit |
|
|
|
Front speed sensor circuit |
|
|
|
Rear speed sensor circuit |
|
|
|
Yaw rate and acceleration sensor circuit |
|
|
|
Steering angle sensor circuit |
|
|
|
If symptoms still occur even after above circuits in suspected areas are inspected and proved to be normal, replace master cylinder solenoid |
|
|
|
Sensor and switch signal check cannot be performed |
TS and CG terminal circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
DTC check cannot be performed |
Check for DTCs again and make sure that no DTC is output |
|
|
TC and CG terminal circuit |
|
|
|
IG power source circuit (high power supply voltage malfunction) |
|
|
|
If symptoms still occur even after above circuits in suspected areas are inspected and proved to be normal, replace master cylinder solenoid |
|
|
|
ABS warning light abnormal (Remains on) |
ABS warning light circuit |
|
|
IG power source circuit (high power supply voltage malfunction) |
|
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
ABS warning light abnormal (Does not come on) |
ABS warning light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
BRAKE warning light abnormal (Remains on) |
BRAKE warning light circuit |
|
|
IG power source circuit (high power supply voltage malfunction) |
|
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
BRAKE warning light abnormal (Does not come on) |
BRAKE warning light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Slip indicator light abnormal (Remains on) |
Slip indicator light circuit |
|
|
IG power source circuit (high power supply voltage malfunction) |
|
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Slip indicator light abnormal (Does not come on) |
Slip indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
VSC OFF indicator light abnormal (Remains on) |
VSC OFF indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
VSC OFF indicator light abnormal (Does not come on) |
VSC OFF indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
AUTO LSD indicator light abnormal (Remains on) |
AUTO LSD indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
AUTO LSD indicator light abnormal (Does not come on) |
AUTO LSD indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Meter buzzer abnormal |
Skid control buzzer circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
TRAC OFF indicator light abnormal (Remains on) |
TRAC OFF indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
TRAC OFF indicator light abnormal (Does not come on) |
TRAC OFF indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
A-TRAC indicator light abnormal (Remains on) |
A-TRAC indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
A-TRAC indicator light abnormal (Does not come on) |
A-TRAC indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Crawl indicator light abnormal (Remains on) |
Crawl indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Crawl indicator light abnormal (Does not come on) |
Crawl indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Multi-terrain select indicator light abnormal (Remains on) |
Multi-terrain select indicator light circuit |
|
|
Multi-terrain select indicator light abnormal (Does not come on) |
Multi-terrain select indicator light circuit |
|
|
Downhill assist control indicator light abnormal (Remains on) |
Downhill assist control indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
|
|
Downhill assist control indicator light abnormal (Does not come on) |
Downhill assist control indicator light circuit |
|
|
Master cylinder solenoid (skid control ECU) |
|
.gif)
Test Mode Procedure
TEST MODE PROCEDURE
NOTICE:
After replacing the master cylinder solenoid and/or yaw rate and acceleration
sensor, perform calibration.
VSC is prohibited during test mode.
H ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DIAGNOSIS
(a) If the skid control ECU detects a malfunction, the ABS and/or BRAKE warning
lights and the slip indicator lights come on in accordance with the trouble area
to ...
Other materials about Toyota 4Runner:
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK CERTIFICATION ECU
(a) Disconnect the F79 certification ECU connector.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
Terminal No. (Symbol)
Wiring Color
Ter ...
Removal
REMOVAL
PROCEDURE
1. REMOVE UPPER RADIATOR SUPPORT SEAL
2. REMOVE FRONT BUMPER COVER
(a) Put protective tape around the front bumper cover.
(b) Remove the 3 bolts, 10 screws and 6 clips.
(c) Detach the 14 claws to remove the front bumper cover with ra ...
0.0077