Pattern Select Switch Snow Mode Circuit

A761E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: Pattern Select Switch Snow Mode Circuit
- Pattern Select Switch Snow Mode Circuit

DESCRIPTION

The passenger side junction block ECU receives pattern select switch information, and sends it through the multiplex communication system and CAN system to the ECM.

ECT SNOW is the system that operates the throttle motor to control engine output to reduce skidding of the driving wheels, and guarantee takeoff acceleration, driving straightness and turning stability.

WIRING DIAGRAM





HINT
*: Pattern Select Switch (ECT SNOW Switch)

When the ECT SNOW switch is pushed, the switch contact is made and the ECT SNOW mode is selected.

To cancel the ECT SNOW mode, push the ECT SNOW switch again.

The ECT SNOW mode is automatically canceled when the ignition switch is turned OFF.

INSEPCTION PROCEDURE

PROCEDURE

1. DRIVING TEST

HINT
* The driving test should be done on a paved road (nonskid road).
* Make sure not to use the TRAC system when testing a vehicle equipped with one.
(a) Start the engine.

(b) Turn the ECT SNOW switch OFF (Normal drive mode).

(c) Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.

(d) Turn the ECT SNOW switch ON and perform the same check as above.

When driving the vehicle with the ECT SNOW switch ON and OFF, check that there is a difference in acceleration.

OK:

There is a difference in acceleration.

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
NG -- Continue to next step.

2. CHECK WIRE HARNESS (PATTERN SELECT SWITCH - BODY GROUND)

(a) Disconnect the E11 switch connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





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

3. INSPECT PATTERN SELECT SWITCH

(a) Measure the resistance of the switch.





Standard resistance:





NG -- REPLACE PATTERN SELECT SWITCH Removal and Replacement
OK -- Continue to next step.

4. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - PATTERN SELECT SWITCH)





(a) Disconnect the P4 ECU connector.

(b) Measure the resistance of the passenger side junction block ECU.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures