Toyota 4Runner: How To Proceed With Troubleshooting

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use these procedures to troubleshoot the push-button start function.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS CHECK

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points in the problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Running conditions, driving conditions, weather conditions
How did it happen?	Problem symptoms

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.	INSPECT 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 (HOW TO PROCEED WITH TROUBLESHOOTING)

5.	CHECK FOR DTC*

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

(b) Clear the DTCs (See page ).

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

GO TO DIAGNOSTIC TROUBLE CODE CHART

6.	INSPECT BASIC OPERATION

(a) Check that the engine can be started by the basic operation.

(1) Push the engine switch when the brake pedal is depressed and the shift lever is in P. Check that the engine starts.

OK:

Engine starts.

(b) Check that the engine switch mode can be changed by pushing the engine switch.

(1) Without depressing the brake pedal, push the engine switch repeatedly. Check that the power source mode turns from off to on (ACC) to on (IG) and back to off.

OK:

Power source mode changes as described above.

(2) With the brake pedal depressed and the shift lever in P, push the engine switch. Check that the engine starts normally from any power source mode status.

OK:

Engine starts normally from any power source mode status.

7.	PROBLEM SYMPTOMS TABLE

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

Result	Proceed to
Fault is not listed in the problem symptoms table	A
Fault is listed in the 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 ).

9.	REPAIR OR REPLACE

10.	CONFIRMATION TEST

END

System Diagram

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Problem Symptoms Table

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