Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Steering / Power Assist Systems / Power Steering System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

(a) Confirm problem symptoms (See page ).

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.

4.	CHECK DTC*

(a) Check and record DTCs.

5.	CLEAR DTC*

(a) Clear the DTCs.

6.	PROBLEM SYMPTOM CONFIRMATION

Result	Proceed to
Symptom does not occur	A
Symptom occurs	B

GO TO STEP 8

7.	SYMPTOM SIMULATION

(a) Perform symptom simulation (See page ).

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.

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

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

GO TO STEP 11

10.	PROBLEM SYMPTOMS TABLE

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

11.	CIRCUIT INSPECTION

12.	IDENTIFICATION OF PROBLEM

13.	REPAIR OR REPLACE

14.	CONFIRMATION TEST

END

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