Toyota Tacoma manuals

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

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / 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

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 Dete ...

Transfer Shift Motor Limit Switch Circuit (P17AC)
DESCRIPTION When the transfer switches modes, the TL1, TL2 and TL3 terminals of the limit switch are in one of the ON/OFF combinations listed in the table below. Terminal Whe ...

Other materials:

Listening to Bluetooth® audio
The Bluetooth® audio system enables the user to enjoy music played on a portable player from the vehicle speakers via wireless communication. Select “ Audio” on the “Select Audio Source” screen. When a Bluetooth® device cannot be connected, check the connection status on the “Bluet ...

Performance and Maintenance
Traction Control/Electronic Stability Control The Traction Control System (TCS) limits wheel slip. The system turns on automatically every time the vehicle is started. The StabiliTrak system assists with directional control of the vehicle in difficult driving conditions. The system turns on automat ...

Removal
REMOVAL CAUTION / NOTICE / HINT CAUTION: Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing. Click here PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be ...

© 2011-2023 Copyright www.ttguide.net