Toyota Tacoma (2015-2018) Service Manual: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance (P279E)
DESCRIPTION
When the transfer position switch is switched, the 2-4 terminal and LO terminal change to one of the following ON/OFF combinations listed in the table below.
|
Terminal |
2WD |
Between 2WD and H4 |
H4 |
Between H4 and L4 |
L4 |
|---|---|---|---|---|---|
|
2-4 |
ON |
OFF |
ON |
OFF |
OFF |
|
LO |
OFF |
OFF |
ON |
OFF |
ON |
This DTC is detected if the transfer position switch 2-4 terminal and LO terminal signals are simultaneously received.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
P279E |
Four Wheel Drive (4WD) Range Signal Circuit Range / Performance |
|
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER POSITION SWITCH) |
(a) Disconnect the F13 4 wheel drive control ECU connector.
(b) Disconnect the F15 transfer position switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F13-14 (2-4) - F15-2 (2-4) |
Always |
Below 1 Ω |
|
F13-13 (LO) - F15-3 (LO) |
Always |
Below 1 Ω |
|
F15-5 (GND) - Body ground |
Always |
Below 1 Ω |
|
F13-14 (2-4) or F15-2 (2-4) - Body ground |
Always |
10 kΩ or higher |
|
F13-13 (LO) or F15-3 (LO) - Body ground |
Always |
10 kΩ or higher |
|
F13-14 (2-4) or F15-2 (2-4) - F13-13 (LO) or F15-3 (LO) |
Always |
10 kΩ or higher |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
|
2. |
CHECK TRANSFER POSITION SWITCH |
|
(a) Remove the transfer position switch with its connector still connected. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
F15-2 (2-4) - Body ground |
Ignition switch ON 2WD position |
Below 1.5 V |
|
Ignition switch ON H4 position |
Below 1.5 V |
|
|
Ignition switch ON L4 position |
10 to 14 V |
|
|
F15-3 (LO) - Body ground |
Ignition switch ON 2WD position |
10 to 14 V |
|
Ignition switch ON H4 position |
Below 1.5 V |
|
|
Ignition switch ON L4 position |
Below 1.5 V |
|
*a |
Component with harness connected (Transfer Position Switch) |
| OK | |
REPLACE 4 WHEEL DRIVE CONTROL ECU |
| NG | |
REPLACE TRANSFER POSITION SWITCH |
Transfer Shift Motor Control Circuit Circuit Open (P17A8)
DESCRIPTION
This DTC is output when an open circuit in the transfer shift motor drive circuit
is detected.
DTC No.
Detection Item
DTC Detection Condition
...
Transfer Shift Motor Control Circuit Low (P17A9)
DESCRIPTION
This DTC is output when a short to ground in the transfer shift motor and A.D.D.
shift motor drive circuit is detected.
DTC No.
Detection Item
DTC Dete ...
Other materials:
Initialization
INITIALIZATION
1. INITIALIZE SLIDING ROOF SYSTEM
NOTICE:
Before starting this operation, make sure that the guide rails are not
deformed and there is no foreign matter on the guide rails.
When the sliding roof glass sub-assembly or sliding roof drive cable
sub-assembly is adju ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
The ECM of this system is connected to the CAN communication system.
Therefore, before starting troubleshooting, make sure to check that there
is no trouble in the CAN and multiplex communication system.
*: Use the Techstream.
PROCEDURE
...
Check Bus 5 Line for Short to GND
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there
is no resistance between terminal 15 (CA5H) of the central gateway ECU (network
gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the central
gateway ECU (network gateway ECU) and ...
