DESCRIPTION
Detection Item | Symptom |
Trouble Area | 4WD Control ECU Communication Stop Mode |
Any of the following conditions are met:
- Communication stop for "Four Wheel Drive Control" is indicated on the "Communication Bus Check" screen of the Techstream.
- Communication system DTCs (DTCs that start with U) that correspond to
"4WD Control ECU Communication Stop Mode" in "DTC Combination Table" are
output.
|
- 4 wheel drive control ECU (4WD control ECU) branch wire or connector
- Power source circuit of 4 wheel drive control ECU (4WD control ECU)
- 4 wheel drive control ECU (4WD control ECU) ground circuit
- 4 wheel drive control ECU (4WD control ECU)
| WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
HINT:
- Before disconnecting related connectors for inspection, push in on each
connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS WIRE (4 WHEEL DRIVE CONTROL ECU [4WD CONTROL ECU] BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 4 wheel drive control ECU (4WD control ECU) connector. |
|
*a | Rear view of wire harness connector
(to 4 wheel drive control ECU [4WD control ECU]) | | |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A25-23 (CANH) - A25-22 (CANL) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
NG |
| REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
OK |
| |
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A26-5 (GND) - Body ground |
Cable disconnected from negative (-) battery terminal |
Below 1 Ω | |
|
*a | Rear view of wire harness connector
(to 4 wheel drive control ECU [4WD control ECU]) | | |
(b) Reconnect the cable to the negative (-) battery terminal. NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
Click here (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition |
Specified Condition |
A26-6 (B) - Body ground |
Always | 11 to 14 V |
A26-16 (IG) - Body ground |
Ignition switch ON | 11 to 14 V |
Ignition switch off | Below 1 V |
OK |
| REPLACE 4 WHEEL DRIVE CONTROL ECU |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) | |