Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use these procedures to troubleshoot the air conditioning system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

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 COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN communication system is functioning normally.

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

GO TO CAN COMMUNICATION SYSTEM

5.	CHECK PANEL DIAGNOSIS

(a) Check panel diagnosis (See page ).

(1) Indicator Check

(2) Sensor Check

6.	CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output (See page ).

(b) Clear the DTCs (See page ).

(c) Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the conditions indicated by the DTC. Then recheck for DTCs.

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

GO TO DIAGNOSTIC TROUBLE CODE CHART

7.	PROBLEM SYMPTOMS TABLE

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

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

GO TO STEP 9

8.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU (See page
).

(b) Data List / Active Test (See page ).

(d) Inspection

9.	ADJUST, REPAIR OR REPLACE

10.	CONFIRMATION TEST

END

System Diagram

SYSTEM DIAGRAM Communication Table Transmitter Receiver Signal Communication Line Air conditioning amplifier assembly ECM ...

Customize Parameters

CUSTOMIZE PARAMETERS 1. CUSTOMIZING FUNCTION WITH TECHSTREAM (REFERENCE) HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make ...

Other materials about Toyota 4Runner:

Rear window and outside rear view mirror defoggers
Defoggers are used to defog the rear window, and to remove raindrops, dew and frost from the outside rear view mirrors. Before operating the defoggers, make sure the back window is completely closed. Vehicles with a manual air conditioning system Tu ...

Short to Battery in Hall Effect Sensor Power Circuit (32)
DESCRIPTION When there is a short to battery in the side auto step motor hall sensor power circuit, the side auto step controller ECU assembly will not operate the automatic running board. DTC No. Detection Condition Trou ...