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:

System Diagram
SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signals Communication Method ECM Skid control ECU Throttle position signal Engine speed signal Accelerator pedal position ...

Communication Error from VSC to ECM (P1630)
DESCRIPTION The skid control ECU (brake actuator assembly) sends signals such as cruise control cancel signals and brake demand response signals to the ECM when the dynamic radar cruise control system is operating. DTC No. Detection Item DTC Detection Condition ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART VSC System DTC Code Detection Item See page C1201 Engine Control System Malfunction C1203 ECM Communication Circuit Malfunction C120B ...

© 2011-2021 Copyright www.ttguide.net