Toyota Tacoma (2015-2018) Service Manual: How To Proceed With Troubleshooting

Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/ Smart Key System) / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use this procedure to troubleshoot the engine immobiliser system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

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

HINT:

A simple method to determine whether the battery is discharged is to operate the horn.

3.	TURN ENGINE SWITCH ON (IG)

HINT:

If the engine switch cannot be turned on (IG), communication with the Techstream can be confirmed by connecting the Techstream to the vehicle and turning a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins.

4.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

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

Click here

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

GO TO CAN COMMUNICATION SYSTEM

5.	CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

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

Click here

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

GO TO LIN COMMUNICATION SYSTEM

6.	CHECK FOR DTC*

(a) Check for DTCs and make a note of any codes that are output.

Click here (b) Based on the DTCs output above, proceed to each diagnostic procedure.

(b) Based on the DTCs output above, proceed to each diagnostic procedure.

Result	Proceed to
DTC is not output	A
SFI system DTC is output	B
Steering lock system DTC is output	C
Engine immobiliser system DTC is output	D

GO TO DIAGNOSTIC TROUBLE CODE CHART

7.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

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) Data List / Active Test

Click here (b) Terminals of ECU

(b) Terminals of ECU

Click here

9.	REPAIR OR REPLACE

10.	CHECK FOR DTC*

(a) Clear the DTCs.

Click here (b) Check for DTCs.

(b) Check for DTCs.

Click here HINT:

HINT:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure.

Click here

Result	Proceed to
DTC is not output	A
Engine immobiliser system DTC is output	B

END

GO TO DIAGNOSTIC TROUBLE CODE CHART

System Diagram

SYSTEM DIAGRAM ...

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Other materials:

Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION for Audio Function: The radio and display receiver assembly receives a vehicle speed signal from the combination meter assembly and sends the signal to radio and display receiver assembly. for Automatic Sound Levelizer (ASL): This circuit is necessary fo ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

VSC OFF Switch Circuit
DESCRIPTION The skid control ECU assembly is connected to the combination meter assembly via CAN communication. Pressing the VSC OFF switch turns off TRAC operation, and pressing and holding this switch turns off TRAC and VSC operation. If TRAC and VSC operations are turned off, the TRAC OFF ...