Toyota Tundra Service Manual: Automatic Disconnecting Differential Motor Control Circuit High (P17A2)

Toyota Tundra Service Manual / Engine, Hybrid System / Wf1am Transfer / Touch Select 2-4 And High-low System / Automatic Disconnecting Differential Motor Control Circuit High (P17A2)

DESCRIPTION

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

DTC Code

DTC Detection Condition

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

Trouble Area

P17A2
  1. Ignition switch ON (when not switching between 2WD and 4H)
  2. Short to B+ in the A.D.D. shift motor drive circui
  3. 1 second or more
  4. 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • A.D.D. actuator (differential vacuum actuator assembly)

WIRING DIAGRAM

Refer to DTCs P17A0 and P17A1 (See page ).

PROCEDURE

1.

CHECK DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (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:

Tester Connection

Switch Condition

Specified Condition

A25-1 (DM1) or A25-2 (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)
OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

2.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY - BODY GROUND)

(a) Disconnect the A25 4 wheel drive control ECU connector.

(b) Disconnect the G1 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

A25-1 (DM1) or G1-1 (DM1) - Body ground

Ignition switch ON

Below 1 V

A25-2 (DM2) or G1-2 (DM2) - Body ground

Ignition switch ON

Below 1 V
OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Automatic Disconnecting Differential Motor Control Circuit Open (P17A0,P17A1)

    Automatic Disconnecting Differential Motor Limit Switch Circuit (P17A4)

    See More:

    Toyota Tundra Service Manual > Sfi System: Freeze Frame Data
    FREEZE FRAME DATA 1. DESCRIPTION Freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, it can help determine if the vehicle was moving or stationar ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.013