Toyota Tundra. Manual — part 17

HINT:



If the sliding roof cannot fully close or its position has become misaligned, perform the
initialization again.



If the sliding roof TILT switch to up or SLIDE switch to close is pressed and held until the
roof glass has either stopped moving or started moving in the opposite direction, and then the
switch is held for another 10 seconds or more, perform the initialization again.



If the AUTO operation function and jam protection function do not operate after the drive
gear has been initialized, replace the sliding roof drive gear (sliding roof ECU) or, adjust or
replace the sliding roof glass.

HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

GENERAL INFORMATION

A large number of ECU controlled systems are used in the TOYOTA TUNDRA. In general, ECU controlled
systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot.
However, most problem checking procedures only involve inspecting the ECU controlled system's circuits one
by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform
effective troubleshooting, accurate diagnoses and necessary repairs.

TROUBLESHOOTING PROCEDURES

1. The troubleshooting procedures consist of diagnosis procedures for when a DTC is stored and diagnosis

procedures for when no DTC is stored. The basic idea is explained in the following table.

DIAGNOSIS PROCEDURE

2. Vehicle systems are complex and use many ECUs that are difficult to inspect independently. Therefore, a

process of elimination is used, where components that can be inspected individually are inspected, and if



Vehicle speed is 5 km/h (3 mph) or more.



Communication is cut off.

Procedure Type

Details

Troubleshooting Method

DTC Based Diagnosis

The diagnosis procedure is
based on the DTC that is
stored.

The malfunctioning part is identified based on the
DTC detection conditions using a process of
elimination.
The possible trouble areas are eliminated one-by-
one by use of the Techstream and inspection of
related parts.

Symptom Based
Diagnosis (No DTCs
stored)

The diagnosis procedure is
based on problem
symptoms.

The malfunctioning part is identified based on the
problem symptoms using a process of elimination.
The possible trouble areas are eliminated one-by-
one by use of the Techstream and inspection of
related parts.

2009 Toyota Tundra

2009 GENERAL INFORMATION Introduction - Tundra

no problems are found in these components, the related ECU is identified as the problem and replaced.

3. It is extremely important to ask the customer about the environment and the conditions present when the

problem occurred (Customer Problem Analysis). This makes it possible to simulate the conditions and
confirm the symptom. If the symptom cannot be confirmed or the DTC does not recur, the malfunctioning
part may not be identified using the troubleshooting procedure, and the ECU for the related system may
be replaced even though it is not defective. If this happens, the original problem will not be solved.

4. In order to prevent endless expansion of troubleshooting procedures, the troubleshooting procedures are

written with the assumption that multiple malfunctions do not occur simultaneously for a single problem
symptom.

5. To identify the malfunctioning part, troubleshooting procedures narrow down the target by separating

components, ECUs and wire harnesses during the inspection. If the wire harness is identified as the cause
of the problem, it is necessary to inspect not only the connections to components and ECUs but also all of
the wire harness connectors between the component and the ECU.

6. DATA LINK CONNECTOR 3 (DLC3)

a. The vehicle's ECU uses the ISO 15765-4 communication protocol. The terminal arrangement of the

DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig. 51: Identifying DLC3 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DLC3 CONNECTOR TERMINALS SPECIFIED CONDITION TABLE

Terminal No.

(Symbols)

Terminal Description

Condition

Specified Condition

7 (SIL) - 5 (SG)

Bus "+" line

During transmission

Pulse generation

4 (CG) - Body ground

Chassis ground

Always

Below 1 ohms

5 (SG) - Body ground

Signal ground

Always

Below 1 ohms

16 (BAT) - Body

ground

Battery positive

Always

11 to 14 V

6 (CANH) - 14 (CANL)

CAN bus line

Ignition switch OFF

(1)

54 to 69 ohms

6 (CANH) - 4 (CG)

HIGH-level CAN bus

line

Ignition switch OFF

(1)

200 ohms or higher

14 (CANL) - 4 (CG)

LOW-level CAN bus line

Ignition switch OFF

(1)

200 ohms or higher

6 (CANH) - 16 (BAT)

HIGH-level CAN bus

line Ignition switch OFF

(1)

6 kohms or higher

2009 Toyota Tundra

2009 GENERAL INFORMATION Introduction - Tundra

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness
and connector.

b. Connect the cable of the intelligent tester or Techstream to the DLC3, turn the ignition switch ON

and attempt to use the tester. If the display indicates that a communication error has occurred, there
is a problem either with the vehicle or with the tester.

HINT:



If communication is normal when the tester is connected to another vehicle, inspect the
DLC3 of the original vehicle.



If communication is still not possible when the tester is connected to another vehicle, the
problem may be in the tester itself. Consult the Service Department listed in the tester's
instruction manual.

HOW TO PROCEED WITH TROUBLESHOOTING

1. OPERATION FLOW

HINT:

Perform troubleshooting in accordance with the procedures below. The following is an outline of basic
troubleshooting procedures. Confirm the troubleshooting procedures for the circuit you are working on
before beginning troubleshooting.

1. VEHICLE BROUGHT TO WORKSHOP

NEXT

2. CUSTOMER PROBLEM ANALYSIS

a. Ask the customer about the conditions and environment when the problem occurred.

NEXT

3. INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

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

14 (CANL) - 16 (BAT) LOW-level CAN bus line

Ignition switch OFF

(1)

6 kohms or higher

(1)

Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate
the ignition switch, any other switches, or the doors.

2009 Toyota Tundra

2009 GENERAL INFORMATION Introduction - Tundra

NEXT

4. SYMPTOM CONFIRMATION AND DTC (INCLUDING FREEZE FRAME DATA)

CHECK

a. Visually check the wire harnesses, connectors and fuses for open and short circuits.

b. Warm up the engine to the normal operating temperature.

c. Confirm the problem symptoms and conditions, and check for DTCs.

Result

DTC OUTPUT RESULT

B: Go to step 6

A: Go to next step.

5. DTC TABLE

a. Check the results obtained in the DTC check. Then find the output DTC in the DTC table.

Look at the "Trouble Area" column for a list of potentially malfunctioning circuits and/or
parts.

NEXT: Go to step 7

6. PROBLEM SYMPTOMS TABLE

a. Check the results obtained in the symptom confirmation. Then find the problem symptoms in

the problem symptoms table. Look at the "Suspected Area" column for a list of potentially
malfunctioning circuits and/or parts.

NEXT

7. CIRCUIT INSPECTION OR PARTS INSPECTION

a. Confirm the malfunctioning circuit or part.

NEXT

8. ADJUST, REPAIR OR REPLACE

a. Adjust, repair or replace the malfunctioning circuit or parts.

NEXT

9. CONFIRMATION TEST

a. After the adjustment, repairs or replacement, confirm that the malfunction no longer exists. If

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 GENERAL INFORMATION Introduction - Tundra