Toyota Tacoma (2015-2018) Service Manual: Transfer Shift Motor Limit Switch Circuit (P17AC)
DESCRIPTION
When the transfer switches modes, the TL1, TL2 and TL3 terminals of the limit switch are in one of the ON/OFF combinations listed in the table below.
|
Terminal |
When 2WD |
Switching between 2WD and H4 |
When H4 |
Switching between H4 and L4 |
When L4 |
|---|---|---|---|---|---|
|
TL1 |
ON (GND) |
ON (GND) |
OFF (OPEN) |
OFF (OPEN) |
OFF (OPEN) |
|
TL2 |
OFF (OPEN) |
OFF (OPEN) |
OFF (OPEN) |
ON (GND) |
ON (GND) |
|
TL3 |
OFF (OPEN) |
ON (GND) |
ON (GND) |
ON (GND) |
OFF (OPEN) |
A malfunction is detected depending on the combination of the 3 circuits that make up the limit switch of the transfer shift actuator assembly.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
P17AC |
Transfer Shift Motor Limit Switch Circuit |
|
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER SHIFT ACTUATOR ASSEMBLY) |
(a) Disconnect the F13 4 wheel drive control ECU connector.
(b) Disconnect the T4 transfer shift actuator assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F13-11 (TL1) - T4-3 (TL1) |
Always |
Below 1 Ω |
|
F13-10 (TL2) - T4-4 (TL2) |
Always |
Below 1 Ω |
|
F13-9 (TL3) - T4-5 (TL3) |
Always |
Below 1 Ω |
|
T4-6 (GND1) - Body ground |
Always |
Below 1 Ω |
|
F13-11 (TL1) or T4-3 (TL1) - Body ground |
Always |
10 kΩ or higher |
|
F13-10 (TL2) or T4-4 (TL2) - Body ground |
Always |
10 kΩ or higher |
|
F13-9 (TL3) or T4-5 (TL3) - Body ground |
Always |
10 kΩ or higher |
|
F13-11 (TL1) - T4-4 (TL2) and T4-5 (TL3) |
Always |
10 kΩ or higher |
|
F13-10 (TL2) - T4-3 (TL1) and T4-5 (TL3) |
Always |
10 kΩ or higher |
|
F13-9 (TL3) - T4-3 (TL1) and T4-4 (TL2) |
Always |
10 kΩ or higher |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
|
2. |
CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE) |
|
(a) Disconnect the transfer shift actuator assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
T4-3 (TL1) - Body ground |
Ignition switch ON |
10 to 14 V |
|
T4-4 (TL2) - Body ground |
Ignition switch ON |
10 to 14 V |
|
T4-5 (TL3) - Body ground |
Ignition switch ON |
10 to 14 V |
|
*a |
Front view of wire harness connector (to Transfer Shift Actuator Assembly) |
| OK | |
REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY |
| NG | |
REPLACE 4 WHEEL DRIVE CONTROL ECU |
Transfer Shift Motor Control Circuit High (P17AA)
DESCRIPTION
This DTC is output when a short to B+ in the transfer shift motor and A.D.D.
shift motor drive circuit is detected.
DTC No.
Detection Item
DTC Detectio ...
Clutch Switch Circuit
DESCRIPTION
While depressing the clutch pedal, the clutch start switch assembly sends a signal
to terminal MTN of the 4 wheel drive control ECU. While the signal is input, switching
between H4 an ...
Other materials:
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER) (USING TECHSTREAM)
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Tire Pressure Monito ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL REAR SEAT 3 POINT TYPE OUTER BELT ASSEMBLY
(a) Before installing the rear seat 3 point type outer belt assembly,
check the ELR function.
Text in Illustration
*a
Unlock
*b
...
General Information
GENERAL INFORMATION
A large number of ECU controlled systems are used in the TOYOTA TACOMA.
In general, ECU controlled systems are considered to be very intricate,
requiring a high level of technical knowledge to troubleshoot. However,
most problem checking procedures only involv ...
