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Toyota Tacoma 2015-2018 Service Manual: Automatic Disconnecting Differential Motor Control Circuit Open (P17A0)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Automatic Disconnecting Differential Motor Control Circuit Open (P17A0)

DESCRIPTION

This DTC is output when an open circuit in the A.D.D. shift motor drive circuit is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17A0

Automatic Disconnecting Differential Motor Control Circuit Open

  • Diagnosis Condition: While switching between 2WD and H4 (A.D.D. shift motor operating) with the ignition switch turned to ON
  • Malfunction Status: Open circuit in the A.D.D. shift motor drive circuit
  • Malfunction Time: 0.03 seconds or more
  • Other: 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 DTC P17A9 (See page PROCEDURE ).

PROCEDURE

1.

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

(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) - A3-1 (DM1)

Always

Below 1 Ω

F12-6 (DM2) - A3-2 (DM2)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (A.D.D. SHIFT MOTOR)

(a) Disconnect the A3 A.D.D. actuator (differential vacuum actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (DM1) - 2 (DM2)

Always

1.5 to 10 Ω

Text in Illustration

*a

Component without harness connected

(A.D.D. Actuator (Differential Vacuum Actuator Assembly))

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

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