Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

(a) Refer to How to Troubleshoot ECU Controlled Systems in the Introduction section (See page ).

3.	INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

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

4.	CONNECT TECHSTREAM TO DLC3*

5.	CHECK AND CLEAR DTCS AND FREEZE FRAME DATA*

(a) Refer to DTC Check / Clear (See page )

6.	VISUAL INSPECTION

7.	SETTING CHECK MODE DIAGNOSIS*

(a) Refer to Check Mode Procedure (Click here
).

8.	PROBLEM SYMPTOM CONFIRMATION

(a) Refer to Road Test (See page ).

Result	Proceed to
Symptom does not occur	A
Symptom occurs	B

GO TO STEP 10

9.	SYMPTOM SIMULATION

(a) Refer to Electronic Circuit Inspection Procedure (See page ).

10.	DTC CHECK*

(a) Refer to DTC Check / Clear (See page ).

Result	Proceed to
DTC is not output	A
DTC is output	B

GO TO STEP 19

11.	BASIC INSPECTION

(a) Refer to Automatic Transmission Fluid (See page ).

(b) Refer to Park/Neutral Position Switch (See page ).

GO TO STEP 22

12.	MECHANICAL SYSTEM TESTS

(a) Refer to Mechanical System Tests (See page ).

GO TO STEP 18

13.	HYDRAULIC TEST

(a) Refer to Hydraulic Test (See page ).

GO TO STEP 18

14.	MANUAL SHIFTING TEST

(a) Refer to Manual Shifting Test (See page
).

GO TO STEP 17

15.	PROBLEM SYMPTOMS TABLE CHAPTER 1

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

GO TO STEP 20

16.	PROBLEM SYMPTOMS TABLE CHAPTER 2

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

GO TO STEP 18

17.	PROBLEM SYMPTOMS TABLE CHAPTER 3

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

18.	PART INSPECTION

GO TO STEP 22

19.

DTC CHART

(a) Refer to Diagnostic Trouble Code Chart (See page ).

20.	CIRCUIT INSPECTION

21.	IDENTIFICATION OF PROBLEM

22.	REPAIR OR REPLACE

23.	CONFIRMATION TEST

END

System Description

SYSTEM DESCRIPTION 1. SYSTEM DESCRIPTION (a) The Electronic Controlled Automatic Transmission (ECT) is an automatic transmission that electronically controls shift timing using the Engine Control ...

ROAD TEST 1. PROBLEM SYMPTOM CONFIRMATION (a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transmission does not shift up or shif ...

Other materials about Toyota 4Runner:

Rear Window Defogger System does not Operate
DESCRIPTION When the back door power window is fully closed and the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier. WIRING DIAGRAM CAU ...

Speed Signal Circuit
DESCRIPTION The vehicle speed signal consists of pulses sent to the side auto step controller ECU assembly from the main body ECU (multiplex network body ECU). WIRING DIAGRAM PROCEDURE 1. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK ...