Pattern Select Switch Circuit

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: 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 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:





NG -- REPLACE TOW/HAUL PATTERN SELECT SWITCH ASSEMBLY
OK -- Continue to next step.

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:





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 A27 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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures