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

Four Wheel Drive (4WD) Range Signal Circuit Range / Performance (P279E)
DESCRIPTION When the transfer position switch is switched, the 2-4 terminal and LO terminal change to one of the following ON/OFF combinations listed in the table below. Terminal ...

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 Detectio ...

Other materials:

Front Radar Sensor Incorrect Axial Gap (C1A11)
DESCRIPTION When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor, etc., the millimeter wave radar sensor assembly performs self diagnosis to check if the sensor beam axis has deviated. If the millimeter wave radar sens ...

Transponder Key Amplifier
Components COMPONENTS ILLUSTRATION Installation INSTALLATION PROCEDURE 1. INSTALL TRANSPONDER KEY COIL (a) Engage the 2 claws to install the transponder key coil. (b) Connect the connector. 2. INSTALL UPPER STEERING COLUMN COVER (S ...

Clutch Switch Circuit
DESCRIPTION Clutch switch circuit inspection is necessary for manual transmission vehicles. When the clutch pedal is released, the ECM receives the positive (+) battery voltage through the ECU-IG NO. 2 fuse and ignition switch. While the clutch pedal is depressed, the clutch switch assembly se ...

© 2011-2020 Copyright www.ttguide.net