Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Transfer Shift Motor Control Circuit Low (P17A9)

DESCRIPTION

This DTC is output when a short to ground in the transfer shift motor and A.D.D. shift motor drive circuit is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17A9

Transfer Shift Motor Control Circuit Low

  • Diagnosis Condition: Directly after the ignition switch is turned to ON, or while the ignition switch is turned to ON (transfer shift motor not operating)
  • Malfunction Status: Short to ground in the transfer shift motor and A.D.D. shift motor drive circuits
  • Malfunction Time: 0.5 seconds or more (after the ignition switch is turned to ON, 0.05 seconds or more)
  • Other: 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Transfer shift actuator assembly
  • A.D.D. actuator (differential vacuum actuator assembly)

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CHECK ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR OR 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:

Transfer shift actuator assembly side:

Tester Connection

Condition

Specified Condition

F12-8 (TM1) or F12-7 (TM2) - Body ground

Always

10 kΩ or higher

A.D.D. actuator (differential vacuum actuator assembly) side:

Tester Connection

Condition

Specified Condition

F12-2 (DM1) or F12-6 (DM2) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to 4 Wheel Drive Control ECU)

Result

Result

Proceed to

OK

A

NG (transfer shift actuator assembly side)

B

NG (A.D.D. actuator (differential vacuum actuator assembly) side)

C

A

REPLACE 4 WHEEL DRIVE CONTROL ECU

C

GO TO STEP 3

B

2.

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

(a) Disconnect the F12 4 wheel drive control ECU connector.

(b) Disconnect the T4 transfer shift actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F12-8 (TM1) or T4-2 (TM1) - Body ground

Always

10 kΩ or higher

F12-7 (TM2) or T4-1 (TM2) - Body ground

Always

10 kΩ or higher

OK

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

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

(a) Disconnect the F12 4 wheel drive control ECU connector.

(b) Disconnect the A3 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

F12-2 (DM1) or A3-1 (DM1) - Body ground

Always

10 kΩ or higher

F12-6 (DM2) or A3-2 (DM2) - Body ground

Always

10 kΩ or higher

OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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