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:
Taillight Relay Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the
TAIL relay.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing
the following inspection procedure.
If the main body EC ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Steering Lock System
DTC Code
Detection Item
See page
B2781
Open / Short in Steering Lock ECU
B2782
Power Source Control ECU Malfunction
...
Horn System
Parts Location
PARTS LOCATION
ILLUSTRATION
Precaution
PRECAUTION
1. IGNITION SWITCH EXPRESSIONS
(a) The type of ignition switch used on this model differs depending on the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Exp ...