Toyota Tundra Service Manual: Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to turn the cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL. The SET, TAP-DOWN and - (COAST) functions, and the RES (RESUME), TAP-UP and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact points of the cruise control main switch turn on with switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control the SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL functions.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Cruise Control / Data List.

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

Powertrain > Cruise Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Main SW M-CPU

Cruise control main switch signal (Main CPU)

ON or OFF

ON: Cruise control main switch (ON-OFF button) on

OFF: Cruise control main switch (ON-OFF button) off

-

Cancel Switch

CANCEL switch signal

ON or OFF

ON: CANCEL switch on

OFF: CANCEL switch off

-

SET/COAST Switch

-SET switch signal

ON or OFF

ON: -SET switch on

OFF: -SET switch off

-

RES/ACC Switch

+RES switch signal

ON or OFF

ON: +RES switch on

OFF: +RES switch off

-

OK:

When the cruise control main switch is operated, the display changes as shown above.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT CRUISE CONTROL MAIN SWITCH

(a) Remove the cruise control main switch.

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(b) Inspect the cruise control main switch.

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NG

REPLACE CRUISE CONTROL MAIN SWITCH

OK

3.

INSPECT CRUISE CONTROL SWITCH WIRE

(a) Disconnect the spiral cable with sensor sub-assembly connector.

*a

Front view of wire harness connector

(to Spiral Cable with Sensor Sub-assembly)

*b

Front view of wire harness connector

(to Cruise Control Main Switch)

(b) Disconnect the cruise control main switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

z2-3 (CCS) - A-3 (CCS)

Always

Below 1 Ω

z2-4 (ECC) - A-1 (ECC)

Always

Below 1 Ω

z2-3 (CCS) or A-3 (CCS) - Body ground

Always

10 kΩ or higher

z2-4 (ECC) or A-1 (ECC) - Body ground

Always

10 kΩ or higher

NG

REPLACE CRUISE CONTROL SWITCH WIRE

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly.

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(b) Inspect the spiral cable with sensor sub-assembly.

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NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - ECM AND BODY GROUND)

(a) for 1UR-FE:

(1) Disconnect the J45 spiral cable with sensor sub-assembly connector.

(2) Disconnect the A24 ECM connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J45-1 (CCS) - A24-45 (CCS)

Always

Below 1 Ω

J45-2 (ECC) - Body ground

Always

Below 1 Ω

J45-1 (CCS) or A24-45 (CCS) - Body ground

Always

10 kΩ or higher

(b) for 3UR-FE:

(1) Disconnect the J45 spiral cable with sensor sub-assembly connector.

(2) Disconnect the A24 ECM connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J45-1 (CCS) - A24-60 (CCS)

Always

Below 1 Ω

J45-2 (ECC) - A24-59 (ECCS)

Always

Below 1 Ω

J45-1 (CCS) or A24-60 (CCS) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Cruise Control System

    Cruise Main Indicator Light Circuit

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