Last Modified: 11-29-2007 1.6 J
Service Category: Drivetrain Section: Automatic Transmission/Transaxle
Model Year: 2008 Model: Sequoia Doc ID: RM0000031IU00BX
Title: AB60E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia)

Pattern Select Switch Circuit

DESCRIPTION

The ECM receives tow/haul pattern select switch information and performs the tow/haul control.

While the tow/haul control is operating, in contrast to normal mode, low gears are used to increase engine braking and towing power, reduce frequent shifts, and improve driveability. The tow/haul control includes throttle control, shift schedule control, wide open throttle shift timing control and AI-SHIFT control.

Tow/haul mode only operates when the shift lever is in D and the tow/haul pattern select switch is ON.

HINT:

  • The tow/haul pattern select switch is a momentary-type switch.
  • In order to cancel tow/haul mode, push the tow/haul pattern select switch again or turn the ignition switch off.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

INSPECT TOW/HAUL PATTERN SELECT SWITCH ASSEMBLY

(a) Remove the tow/haul pattern select switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - 4

Tow/haul pattern select switch ON

Below 1 Ω

Tow/haul pattern select switch OFF

10 kΩ or higher
OK

2.

CHECK HARNESS AND CONNECTOR (TOW/HAUL PATTERN SELECT SWITCH - BODY GROUND)

(a) Disconnect the H30 tow/haul pattern select switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H30-1 - Body ground

Always

Below 1 Ω
OK

3.

CHECK HARNESS AND CONNECTOR (TOW/HAUL PATTERN SELECT SWITCH - ECM)

(a) Disconnect the A27 ECM connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A27-51 (PWR) - Body ground

Tow/haul pattern select switch ON

Below 1 Ω

Tow/haul pattern select switch OFF

10 kΩ or higher
OK