Lexus ES: Linear Solenoid Power Supply System Malfunction (C120C)
DESCRIPTION
This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C120C | Linear Solenoid Power Supply System Malfunction |
|
|
| Vehicle Condition | ||||
|---|---|---|---|---|
| Pattern 1 | Pattern 2 | Pattern 3 | ||
| Diagnosis Condition | When the 4WD relay is on and the voltage at the IG1 terminal is 9.5 V or more | ○ | - | - |
| When the 4WD relay is on and the voltage at the IG1 terminal is less than 9.5 V | - | ○ | - | |
| While the 4WD relay is off | - | - | ○ | |
| Malfunction Status | The 4WD relay monitor remains off | ○ | ○ | - |
| The 4WD relay monitor remains on immediately after the engine switch is turned on (IG) | - | - | ○ | |
| Detection Time | 1 second or more | 1 second or more | 1 second or more | |
| Number of Trips | 1 trip | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for any of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) |
| (a) Disconnect the G131 4WD ECU assembly connector. |
|
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G131-3 (IG1) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Turn the engine switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G131-4 (GND) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | RECONFIRM DTC |
(a) Clear the DTC.
Chassis > Four Wheel Drive > Clear DTCs(b) Turn the engine switch on (IG).
(c) Check that no DTCs other than DTC C120C have been output.
Chassis > Four Wheel Drive > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs other than DTC C120C are not output | A |
| DTCs other than DTC C120C are output | B |
| A | | REPLACE 4WD ECU ASSEMBLY |
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| B | | REPAIR CIRCUIT INDICATED BY OUTPUT CODE |
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