Toyota Tundra (2015 year). Manual — part 875

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (A.D.D. SHIFT MOTOR)

(a) Disconnect the 4 wheel drive control ECU connector.

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

below.

Standard Resistance:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

A25-1 (DM1) - A25-2 (DM2)

Always

2 Ω or less

A25-1 (DM1) or A25-2 (DM2) -

Body ground

Always

10 kΩ or higher

Text in Illustration

*a

NG

GO TO STEP 2

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

2.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL
VACUUM ACTUATOR ASSEMBLY)

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

(a) Disconnect the A25 4 wheel drive control ECU connector.

(b) Disconnect the G1 A.D.D. actuator (differential vacuum actuator assembly) connector.

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

Standard Resistance:

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

A25-1 (DM1) - G1-1 (DM1)

Always

Below 1 Ω

A25-2 (DM2) - G1-2 (DM2)

Always

Below 1 Ω

A25-1 (DM1) or G1-1 (DM1) - Body ground

Always

10 kΩ or higher

A25-2 (DM2) or G1-2 (DM2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR

ASSEMBLY

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000005KPU001X

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: P17A2; Automatic Disconnecting

Differential Motor Control Circuit High; 2015 MY Tundra [08/2014 - ]

DTC

P17A2

Automatic Disconnecting Differential Motor Control Circuit High

DESCRIPTION

This DTC is detected when a short to B+ is detected in the A.D.D. shift motor drive circuit.

DTC

CODE

DTC DETECTION CONDITION

DIAGNOSIS CONDITION

1.

MALFUNCTION STATUS

2.

MALFUNCTION TIME

3.

OTHER

4.

TROUBLE AREA

P17A2

Ignition switch ON (when not switching

between 2WD and 4H)

1.

Short to B+ in the A.D.D. shift motor

drive circui

2.

1 second or more

3.

1 trip detection logic

4.

Wire harness and connector

4 wheel drive control ECU

A.D.D. actuator (differential vacuum

actuator assembly)

WIRING DIAGRAM

Refer to DTCs P17A0 and P17A1

.

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (A.D.D. SHIFT MOTOR)

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

(a) Disconnect the 4 wheel drive control ECU connector.

(b) Measure the voltage according to the value(s) in the table

below.

Standard Voltage:

TESTER CONNECTION

SWITCH

CONDITION

SPECIFIED

CONDITION

A25-1 (DM1) or A25-2 (DM2) -

Body ground

Ignition switch

ON

Below 1 V

Text in Illustration

*a

NG

GO TO STEP 2

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

2.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND
DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY - BODY GROUND)

(a) Disconnect the A25 4 wheel drive control ECU connector.

(b) Disconnect the G1 A.D.D. actuator (differential vacuum actuator assembly) connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

TESTER CONNECTION

SWITCH CONDITION

SPECIFIED CONDITION

A25-1 (DM1) or G1-1 (DM1) - Body ground

Ignition switch ON

Below 1 V

A25-2 (DM2) or G1-2 (DM2) - Body ground

Ignition switch ON

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR

ASSEMBLY

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...