Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Pattern Select Switch Power Mode Circuit

DESCRIPTION

The ECM memory contains the programs for the normal and PWR shift patterns.

By following the programs corresponding to the signals from the pattern select switch assembly, park/neutral position switch and other various sensors, the ECM switches the shift solenoid valves on and off, and controls the transmission gear ratio.

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

INSPECT PATTERN SELECT SWITCH ASSEMBLY

(a) Remove the pattern select switch assembly (See page ).

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (E) - 4 (B)

Pattern select switch assembly pushed

Below 1 Ω

1 (E) - 4 (B)

Pattern select switch assembly not pushed

10 kΩ or higher

Text in Illustration

*1

Pattern Select Switch Assembly

NG

REPLACE PATTERN SELECT SWITCH ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND)

(a) Disconnect the pattern select switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P20-1 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Pattern Select Switch Assembly))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - ECM)

(a) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

E21-14 (PWMS) - Body ground

Pattern select switch assembly pushed

Below 1 Ω

E21-14 (PWMS) - Body ground

Pattern select switch assembly not pushed

10 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to ECM)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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