Toyota Tacoma manuals

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

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the engine immobiliser system.

*: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS

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 for problem analysis:

What

Vehicle model, system name

When

Date, time, occurrence frequency

Where

Road conditions

Under what conditions?

Driving conditions, weather conditions

How did it happen?

Problem symptoms

NEXT

3.

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.

NEXT

4.

CRANK ENGINE FOR MORE THAN 10 SECONDS

NEXT

5.

CHECK FOR DTCS (ENGINE IMMOBILISER SYSTEM)*

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

(b) Clear the DTCs.

Click here (c) Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine

(c) Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine immobiliser system DTC by simulating the symptoms indicated by the DTCs.

Result

Proceed to

No DTCs are output

A

Engine immobiliser system DTC is output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

6.

CHECK FOR DTCS (SFI SYSTEM)*

(a) Clear the DTCs.

Click here (b) Recheck for DTCs.

(b) Recheck for DTCs.

HINT:

The DTCs for the engine immobiliser system are specified below. If other DTCs are output, check the DTC chart for the SFI system.

Result

Proceed to

No DTCs are output

A

Engine immobiliser system DTC is output (DTC B2799, B279A or B279C)

B

SFI system DTC is output (except DTC B2799, B279A and B279C) (for 2TR-FE)

C

SFI system DTC is output (except DTC B279986, B279A12 and B279C95) (for 2GR-FKS)

D

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

GO TO SFI SYSTEM

D

GO TO SFI SYSTEM

A

7.

READ VALUE USING TECHSTREAM*

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Immobiliser / Data List.

(e) Read the Data List according to the display on the Techstream.

Immobiliser

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Key SW

Unlock warning switch signal/ON or OFF

ON: Key in ignition key cylinder

OFF: No key in ignition key cylinder

-

OK:

On the Techstream screen, the item changes between ON and OFF according to the chart above.

NG

GO TO DTC B2780

OK

8.

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

B

GO TO STEP 10

A

9.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test

Click here (b) Terminals of ECU

(b) Terminals of ECU

Click here

NEXT

10.

REPAIR OR REPLACE

NEXT

11.

CONFIRMATION TEST

NEXT

END

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 ...

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