DTC DETECTION LOGIC
Malfunction related to AWD solenoid has been detected.
| DTC No. |
CONSULT screen terms (Trouble diagnosis content) | DTC detecting condition | |
|---|---|---|---|
| C1204 |
4WD SOLENOID (4WD solenoid) |
Diagnosis condition | Ignition switch: ON |
| Signal | — | ||
| Threshold | — | ||
| Diagnosis delay time | — | ||
POSSIBLE CAUSE
Internal malfunction of electronic controlled coupling
Malfunction of AWD solenoid power supply circuit (open or short)
Malfunction of AWD solenoid command current
FAIL-SAFE
Front-wheel drive or shifts to 4-wheel drive (rear-wheels still have some driving torque).
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always place the ignition switch in the OFF position and wait at least 10 seconds before conducting the next test.
>>
GO TO 2.
DTC REPRODUCTION PROCEDURE
CONSULT
Ignition switch ON.
Select “Self Diagnostic Result” mode of “ALL MODE AWD/4WD”.
Is DTC “C1204” detected?
YES>>Proceed to DTC Diagnosis Procedure.
NO>>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO>>Confirmation after repair: Inspection End.
CHECK AWD SOLENOID POWER SUPPLY (1)
Ignition switch OFF.
Disconnect AWD control unit harness connector.
Check the voltage between AWD control unit harness connector and ground.
| (+) | (–) |
Voltage (Approx.) | |
|---|---|---|---|
| AWD control unit | |||
| Connector | Terminal | ||
| B135 | 9 | Ground | Battery voltage |
Ignition switch ON.
CAUTION:
Never start the engine.
Check the voltage between AWD control unit harness connector and ground.
| (+) | (–) |
Voltage (Approx.) | |
|---|---|---|---|
| AWD control unit | |||
| Connector | Terminal | ||
| B135 | 9 | Ground | Battery voltage |
Is the inspection result normal?
YES>>GO TO 3.
NO>>GO TO 2.
CHECK AWD SOLENOID POWER SUPPLY (2)
Ignition switch OFF.
Check the 10A fuse (#62)
Check the harness for open or short between AWD control unit harness connector B135 terminal No. 9 and 10A fuse (#62).
Is the inspection result normal?
YES>>Perform the trouble diagnosis for battery power supply circuit. Refer to Wiring Diagram.
NO>>Repair or replace error-detected parts.
CHECK AWD SOLENOID GROUND
Check the continuity between AWD control unit harness connector and ground.
| AWD control unit | — | Continuity | |
|---|---|---|---|
| Connector | Terminal | ||
| B135 | 10 | Ground | Yes |
| 11 | |||
Is the inspection result normal?
YES>>GO TO 4.
NO>>Repair or replace error-detected parts.
CHECK AWD SOLENOID CIRCUIT (1)
Check the resistance between AWD control unit harness connector.
| AWD control unit |
Resistance (Approx.) | ||
|---|---|---|---|
| Connector | Terminals | ||
| B135 | 1 | 2 | 2.5 Ω |
Is the inspection result normal?
YES>>GO TO 7.
NO>>GO TO 5.
CHECK AWD SOLENOID CIRCUIT (2)
Disconnect AWD solenoid harness connector.
Check the continuity between AWD control unit harness connector and AWD solenoid harness connector.
| AWD control unit | AWD solenoid | Continuity | ||
|---|---|---|---|---|
| Connector | Terminal | Connector | Terminal | |
| B135 | 1 | C12 | 2 | Yes |
| 2 | 1 | |||
Check the continuity between AWD control unit harness connector and the ground.
| AWD control unit | — | Continuity | |
|---|---|---|---|
| Connector | Terminal | ||
| B135 | 1 | Ground | No |
| 2 | |||
Is the inspection result normal?
YES>>GO TO 6.
NO>>Repair or replace error-detected parts.
CHECK AWD SOLENOID
Check AWD solenoid. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 7.
NO>>AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to Removal and Installation.
CHECK TERMINALS AND HARNESS CONNECTORS
Check AWD control unit pin terminals for damage or loose connection with harness connector.
Check AWD solenoid pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES>>Replace AWD control unit. Refer to Removal and Installation.
NO>>Repair or replace error-detected parts.
CHECK AWD SOLENOID
Ignition switch OFF.
Disconnect AWD solenoid harness connector.
Check the resistance between AWD solenoid harness connector terminals.
| AWD solenoid |
Resistance (Approx.) | |
|---|---|---|
| Terminals | ||
| 1 | 2 | 2.5 Ω |
Is the inspection result normal?
YES>>Inspection End.
NO>>AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to Removal and Installation.
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