P17AC

DTC Code	DTC Name
P17AC	Transfer Shift Motor Limit Switch Circuit

DESCRIPTION

When the transfer shift actuator assembly is switching between high (H4) and low (L4), the HL1, HL2 and HL3 terminals are in one of the ON/OFF combinations listed in the table below.

Terminal	Mode
Terminal	HIGH (H4)	Switching					LOW (L4)
HL1	ON	ON	←→	OFF*	←→	OFF	OFF
HL2	OFF	OFF		OFF*		ON	ON
HL3	OFF	ON		ON*		ON	OFF

*: Neutral position (only for vehicles with a manual transmission)

For vehicles with a manual transmission, when conditions for switching between H4 and L4 are not met, the transfer shift actuator assembly temporarily stops at the neutral position. Afterwards, when the conditions are met, switching is performed.

A malfunction is detected depending on the combination of the 3 circuits that make up the high-low transfer limit switch.

DTC No.	DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other	Trouble Area
P17AC	When switching between high and low (high-low transfer shift motor operating) while the ignition switch is turned to ON or directly after the ignition switch is turned to ON The combination of HL1, HL2 and HL3 does not match 0.05 seconds or more (if directly after ignition switch is turned to ON, 1 second or more) 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Transfer shift actuator assembly

DTC No.

DTC Detection Condition

Diagnosis Condition
Malfunction Status
Malfunction Time
Other

Trouble Area

P17AC

When switching between high and low (high-low transfer shift motor operating) while the ignition switch is turned to ON or directly after the ignition switch is turned to ON
The combination of HL1, HL2 and HL3 does not match
0.05 seconds or more (if directly after ignition switch is turned to ON, 1 second or more)
1 trip detection logic

Wire harness and connector
4 wheel drive control ECU
Transfer shift actuator assembly

WIRING DIAGRAM


*a	Limit Switch
*b	Transfer Shift Actuator Assembly
*c	4 Wheel Drive Control ECU

PROCEDURE

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

Disconnect the A27 4 wheel drive control ECU connector.
Disconnect the C38 transfer shift actuator assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A27-8 (HL1) - C38-4 (HL1)	Always	Below 1 Ω
A27-7 (HL2) - C38-6 (HL2)	Always	Below 1 Ω
A27-6 (HL3) - C38-5 (HL3)	Always	Below 1 Ω
C38-7 (GND) - Body ground	Always	Below 1 Ω
A27-8 (HL1) or C38-4 (HL1) - Body ground	Always	10 kΩ or higher
A27-7 (HL2) or C38-6 (HL2) - Body ground	Always	10 kΩ or higher
A27-6 (HL3) or C38-5 (HL3) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE)

Text in Illustration
*a	Front view of wire harness connector (to Transfer Shift Actuator Assembly)

Disconnect the C38 transfer shift actuator assembly connector.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C38-4 (HL1) - Body ground	Ignition switch ON	10 to 14 V
C38-6 (HL2) - Body ground	Ignition switch ON	10 to 14 V
C38-5 (HL3) - Body ground	Ignition switch ON	10 to 14 V

Result

Result		Proceed to
OK		A
NG	for LHD	B
NG	for RHD	C

A

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY Click here

B

REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

C

REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

TRANSFER SYSTEM, Diagnostic DTC:P17AC