Pattern Select Switch Circuit

AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: Pattern Select Switch Circuit
- 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 the D position 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) for Column Shift Type:





(1) Disconnect the J25 transmission control switch connector.

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

Standard resistance:





(b) for Floor Shift Type:





(1) Remove the rear upper console panel sub-assembly .

(2) Disconnect the J23 tow/haul pattern select switch connector.

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

Standard resistance:





Result





(4) Install the rear upper console panel sub-assembly .

C -- REPLACE TOW/HAUL PATTERN SELECT SWITCH ASSEMBLY

B -- REPLACE COLUMN SHIFT SHIFT LEVER SUB-ASSEMBLY (TRANSMISSION CONTROL SWITCH)
A -- Continue to next step.

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

(a) for Column Shift Type:





(1) Disconnect the J25 transmission control switch connector.

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

Standard resistance:





(b) for Floor Shift Type:





(1) Remove the rear upper console panel sub-assembly .

(2) Disconnect the J23 tow/haul pattern select switch connector.

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

Standard resistance:





(4) Install the rear upper console panel sub-assembly .

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the A24 ECM connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE