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Toyota Tacoma (2015-2018) Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Transfer Shift Motor Control Circuit High (P17AA)

Toyota Tacoma (2015-2018) Service Manual: Transfer Shift Motor Control Circuit High (P17AA)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17AA

Transfer Shift Motor Control Circuit High
  • Diagnosis Condition: Directly after or while the ignition switch is turned to ON (transfer shift motor not operating)
  • Malfunction Status: Short to B+ 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

Refer to DTC P17A9 (See page PROCEDURE )

PROCEDURE

1.

CHECK ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR AND A.D.D. SHIFT MOTOR)

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

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

Standard Voltage:

Transfer shift actuator assembly side:

Tester Connection

Switch Condition

Specified Condition

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

Ignition switch ON

Below 1 V
A.D.D. actuator (differential vacuum actuator assembly) side:

Tester Connection

Switch Condition

Specified Condition

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

Ignition switch ON

Below 1 V
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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

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

Ignition switch ON

Below 1 V

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

Ignition switch ON

Below 1 V
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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

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

Ignition switch ON

Below 1 V

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

Ignition switch ON

Below 1 V
OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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