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Toyota Tacoma 2015-2018 Service Manual: Automatic Disconnecting Differential Motor Limit Switch Circuit (P17A4)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Automatic Disconnecting Differential Motor Limit Switch Circuit (P17A4)

DESCRIPTION

When the A.D.D. actuator switches between 2WD and 4WD, the DL1 and DL2 terminals of the limit switch and ADD terminal of the A.D.D. position switch change to one of the following ON/OFF combinations listed in the table below.

Terminal

In 2WD

Switching between 2WD and 4WD

In 4WD

DL1

ON (GND)

ON (GND)

OFF (OPEN)

DL2

OFF (OPEN)

ON (GND)

ON (GND)

ADD

OFF (OPEN)

OFF (OPEN)

ON (GND)

ON (GND)

A malfunction is detected depending on the combination of the 3 circuits that make up the limit switch and A.D.D. position switch.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17A4

Automatic Disconnecting Differential Motor Limit Switch Circuit

  • Diagnosis Condition: Directly after the ignition switch is turned to ON, or while switching between 2WD and H4 (A.D.D. shift motor operating) with the ignition switch turned to ON
  • Malfunction Status: The ON/OFF combination of DL1, DL2 and ADD does not match the pattern
  • Malfunction Time: 0 seconds
  • Other: 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • A.D.D. actuator (differential vacuum actuator assembly)

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

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

(a) Disconnect the F13 4 wheel drive control ECU connector.

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

(c) for Hydraulic Brake Booster:

Disconnect the S1 skid control ECU (Master Cylinder Solenoid) connector.

for Vacuum Brake Booster:

Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(d) for 2GR-FKS:

Disconnect the E13 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F13-8 (DL1) - A3-6 (DL1)

Always

Below 1 Ω

F13-7 (DL2) - A3-5 (DL2)

Always

Below 1 Ω

F13-2 (ADD) - A3-3 (ADD)

Always

Below 1 Ω

A3-4 (GND) - Body ground

Always

Below 1 Ω

F13-8 (DL1) or A3-6 (DL1) - Body ground

Always

10 kΩ or higher

F13-7 (DL2) or A3-5 (DL2) - Body ground

Always

10 kΩ or higher

F13-2 (ADD) or A3-3 (ADD) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (LIMIT SWITCH AND A.D.D. POSITION SWITCH)

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

(b) for Hydraulic Brake Booster:

Disconnect the S1 skid control ECU (Master Cylinder Solenoid) connector.

for Vacuum Brake Booster:

Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(c) for 2GR-FKS:

Disconnect the E13 ECM connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A3-6 (DL1) - Body ground

Ignition switch ON

10 to 14 V

A3-5 (DL2) - Body ground

Ignition switch ON

10 to 14 V

A3-3 (ADD) - Body ground

Ignition switch ON

10 to 14 V

Text in Illustration

*a

Front view of wire harness connector

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

OK

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

NG

REPLACE 4 WHEEL DRIVE CONTROL ECU

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