Toyota Tundra Service Manual: Transfer Shift Motor Control Circuit Circuit Open (P17A8,P17A9)

Toyota Tundra Service Manual / Engine, Hybrid System / Wf1am Transfer / Touch Select 2-4 And High-low System / Transfer Shift Motor Control Circuit Circuit Open (P17A8,P17A9)

DESCRIPTION

This DTC is detected when an open circuit or short to ground is detected in the transfer shift motor drive circuit.

DTC Code

DTC Detection Condition

  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other

Trouble Area

P17A8

  1. Ignition switch ON (when transfer shift motor is not operating)
  2. Open circuit in the transfer shift motor drive circuit
  3. 1 second or more
  4. 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Transfer shift actuator assembly

P17A9

  1. Ignition switch ON (when transfer shift motor is not operating)
  2. Short to ground in the transfer shift motor drive circuit
  3. 1 second or more
  4. 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Transfer shift actuator assembly

WIRING DIAGRAM

PROCEDURE

1.

CHECK TRANSFER SHIFT ACTUATOR ASSEMBLY (TRANSFER 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:

Tester Connection

Condition

Specified Condition

A26-1 (TM1) - A26-2 (TM2)

Always

Below 5 Ω

A26-1 (TM1) or A26-2 (TM2) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to 4 Wheel Drive Control ECU)

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

2.

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

(a) Disconnect the A26 4 wheel drive control ECU connector.

(b) Disconnect the D67 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

A26-1 (TM1) - D67-1 (TM1)

Always

Below 1 Ω

A26-2 (TM2) - D67-2 (TM2)

Always

Below 1 Ω

A26-1 (TM1) or D67-1 (TM1) - Body ground

Always

10 kΩ or higher

A26-2 (TM2) or D67-2 (TM2) - Body ground

Always

10 kΩ or higher

OK

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Transfer Synchronization Actuator Circuit High (P17A7)

    Transfer Shift Motor Control Circuit High (P17AA)

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