Toyota 4Runner manuals

Toyota 4Runner: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP


NEXT

2.

CUSTOMER PROBLEM ANALYSIS

(a) Confirm problem symptoms (See page ).



NEXT

3.

INSPECT BATTERY VOLTAGE*

(a) Measure the voltage of the battery.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.


NEXT

4.

CHECK DTC*

(a) Check and record DTCs.


NEXT

5.

CLEAR DTC*

(a) Clear the DTCs.


NEXT

6.

PROBLEM SYMPTOM CONFIRMATION

Result

Proceed to

Symptom does not occur

A

Symptom occurs

B


B

GO TO STEP 8


A

7.

SYMPTOM SIMULATION

(a) Perform symptom simulation (See page ).



NEXT

8.

CHECK CAN COMMUNICATION SYSTEM*

(a) Check for DTCs (See page ).


Result

Proceed to

CAN communication system DTC is not output

A

CAN communication system DTC is output

B

HINT:

  • If any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first (See page ).

  • If communication with the power steering ECU assembly cannot be established through the Techstream, inspect terminals CANH and CANL of the DLC3 and power steering ECU assembly, and the IG circuit of the power steering ECU assembly.

B

PROCEED TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)


A

9.

CHECK FOR DTC*

(a) Check for DTCs (See page ).


HINT:

Refer to Diagnostic Trouble Code Chart when any DTCs are output (See page ).


Result

Proceed to

DTC is not output

A

DTC is output

B


B

GO TO STEP 11


A

10.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table (See page
).


NEXT

11.

CIRCUIT INSPECTION


NEXT

12.

IDENTIFICATION OF PROBLEM


NEXT

13.

REPAIR OR REPLACE


NEXT

14.

CONFIRMATION TEST


NEXT

END

System Diagram
SYSTEM DIAGRAM ...

System Description
SYSTEM DESCRIPTION 1. DESCRIPTION (a) In the Variable Flow Control (VFC) power steering system, the power steering ECU assembly receives the steering angle signal, steering zero point memory, the ...

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