Toyota Tundra Service Manual: Automatic Disconnecting Differential Motor Control Circuit Open (P17A0,P17A1)

Toyota Tundra Service Manual / Engine, Hybrid System / Wf1am Transfer / Touch Select 2-4 And High-low System / Automatic Disconnecting Differential Motor Control Circuit Open (P17A0,P17A1)

DESCRIPTION

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

DTC Code

DTC Detection Condition

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

Trouble Area

P17A0
  1. Ignition switch ON (when not switching between 2WD and 4H)
  2. Open circuit in the A.D.D. shift motor drive circuit
  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)

P17A1
  1. Ignition switch ON (when not switching between 2WD and 4H)
  2. Short to ground in the A.D.D. shift motor drive circuit
  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

PROCEDURE

1.

CHECK DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (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:

Tester Connection

Condition

Specified Condition

A25-1 (DM1) - A25-2 (DM2)

Always

2 Ω or less

A25-1 (DM1) or A25-2 (DM2) - 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 - DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY)

(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 resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-1 (DM1) - G1-1 (DM1)

Always

Below 1 Ω

A25-2 (DM2) - G1-2 (DM2)

Always

Below 1 Ω

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

Always

10 kΩ or higher

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

Always

10 kΩ or higher
OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    How To Proceed With Troubleshooting

    Automatic Disconnecting Differential Motor Control Circuit High (P17A2)

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