Pattern Select Switch 2nd Start Mode Circuit

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: Pattern Select Switch 2nd Start Mode Circuit
- Pattern Select Switch 2nd Start Mode Circuit

DESCRIPTION

When 2nd mode is selected with the pattern select (2ND) switch, the ECM controls the shift solenoid valves and the transmission starts from 2nd gear.

The 2nd mode 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.

When the shift lever is in D, the transmission automatically shifts up through 3rd to 6th as usual.

WIRING DIAGRAM

Refer to Pattern Select Switch Power Mode Circuit Pattern Select Switch Power Mode Circuit.

INSPECTION PROCEDURE

When the pattern select (2ND) switch is pushed, switch contact is made and 2nd mode is selected. To cancel 2nd mode, push the pattern select (2ND) switch once again.

HINT
2nd mode is automatically canceled when the engine switch is turned off.

PROCEDURE

1. DRIVING TEST

HINT
The driving test should be performed on a paved road (nonskid road).

(a) Start the engine.

(b) Turn the 2ND switch off (normal drive mode).

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

(d) Turn the 2ND switch on and perform the same check as above.

When driving the vehicle with the 2ND switch on and off, check that there is a difference in acceleration.

OK:

There is a difference in acceleration.

NG -- INSPECT PATTERN SELECT (2ND) SWITCH

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

2. INSPECT PATTERN SELECT (2ND) SWITCH

(a) Remove the suspension control switch Removal.





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

Standard Resistance:





NG -- REPLACE PATTERN SELECT (2ND) SWITCH (SUSPENSION CONTROL SWITCH) Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (PATTERN SELECT (2ND) SWITCH - BODY GROUND)

(a) Disconnect the V4 suspension control 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.

4. CHECK HARNESS AND CONNECTOR (PATTERN SELECT (2ND) SWITCH - ECM)





(a) Disconnect the A38 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 Symptom Related Diagnostic Procedures