DIAGNOSIS SYSTEM
1. DESCRIPTION
Active torque control 4WD system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. Therefore when there seems to be a problem with the active torque control 4WD system, use the Techstream or SST to check and troubleshoot it.
2. CHECK DLC3
(a) The ECU uses CAN (ISO11898-1) and ISO9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO9141-2 format.
Verify the conditions listed in the table below.
Symbol (Terminal No.) |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|
SIL (7) - SG (5) |
Bus + line |
During transmission |
Pulse generation |
CG (4) - Body Ground |
Chassis ground |
Always |
Below 1 Ω |
SG (5) - Body Ground |
Signal ground |
Always |
Below 1 Ω |
BAT (16) - Body Ground |
Battery positive |
Always |
10 to 14 V |
CANH (6) - CANL (14) |
CAN bus line |
Ignition switch off* |
54 to 69 Ω |
CANH (6) - CG (4) |
HIGH-level CAN bus line |
Ignition switch off* |
200 Ω or higher |
CANL (14) - CG (4) |
LOW-level CAN bus line |
Ignition switch off* |
200 Ω or higher |
CANH (6) - BAT (16) |
HIGH-level CAN bus line |
Ignition switch off* |
6 kΩ or higher |
CANL (14) - BAT (16) |
LOW-level CAN bus line |
Ignition switch off* |
6 kΩ or higher |
NOTICE:
*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, other switches or the doors.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:
Connect the cable of the Techstream to the DLC3, turn the ignition switch to ON and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream.
3. WARNING LIGHT
(a) When a problem occurs in the active torque control 4WD system, the AWD warning light on the combination meter comes on to inform the driver of the problem.
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT COOLING FAN OPERATION AT LOW TEMPERATURES (Below 83°C (181°F))
(a) Turn the ignition switch to ON.
(b) Check that the cooling fans stop.
If not, check the cooling fan relays and engine coolant temperature senso ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY
(a) Install the spiral with sensor cable sub-assembly (See page
).
NOTICE:
Do not replace the spiral cable with the battery connected and the engine
switch on (IG).
...