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DESCRIPTION
If a malfunction is detected in the power supply circuit, the skid control ECU
stores this DTC and the fail
safe function prohibits ABS operation.
This DTC is stored when the IG1 terminal voltage deviates from the DTC detection
condition due to a
malfunction in the power supply or charging circuit such as the battery or
alternator circuit, etc.
The DTC is cancelled when the IG1 terminal voltage returns to normal.
| DTC Code | Diag Code | DTC Detection Condition | Trouble Area |
| C1241 |
41 |
When any of the
following is detected:
|
• ECU-IG fuse • Battery • Charging system • Power source circuit • Internal power supply circuit of the skid control ECU |
WIRING DIAGRAM
INSPECTION PROCEDURE
Detail
- Remove the ECU-IG fuse from the No. 1 relay block.
- Measure the resistance according to the value (s) in the table below.
Standard resistance:
Tester Connection Condition Specified Condition ECU-IG (15 A) fuse Always Below 1 Ω
REPLACE ECU-IG FUSE
[2] CHECK BATTERY
- Install the ECU-IG fuse.
- Check the battery voltage.
Standard voltage: 20 to 32 V
CHECK OR REPLACE CHARGING SYSTEM
OR BATTERY (See Pub No.SI-YXZE16D-3 (Chapter CH))
[3] INSPECT SKID CONTROL ECU (IG1 TERMINAL)
- Disconnect the skid control ECU connector.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value (s) in the table below.
Standard voltage:
Tester Connection Switch Condition Specified Condition S13-7 (IG1) - Body ground Ignition switch ON 20 to 32 V
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
[4] INSPECT SKID CONTROL ECU (GND TERMINAL)
- Turn the ignition switch off.
- Disconnect the skid control ECU connectors.
- Measure the resistance according to the value
(s) in the table below.
Standard resistance:
Tester Connection Condition Specified Condition S14-2 (GND1) - Body ground Always Below 1 Ω S14-3 (GND2) - Body ground Always Below 1 Ω S11-15 (GND3) - Body ground Always Below 1 Ω S11-14 (GND4) - Body ground Always Below 1 Ω
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
[5] RECONFIRM DTC
- Reconnect the skid control ECU connectors.
- Clear the DTC (See Pub. No. S1-YXZE05A, page 05- 108).
- Drive the vehicle at the speed of 3 km/h (2 mph) or more for 10 seconds or more.
- Check if the same DTC is recorded (See Pub. No. S1- YXZE05A, page 05-108).
Result:
Result Proceed to DTC (C1241) is not output A DTC (C1241) is output B
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and
proceed to the next step (See PROBLEM SYMPTOMS TABLE).
A
CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM)B
REPLACE SKID CONTROL ECU
- Confirm the DTC C1241 is inactive
- Start the engine and let it idling condition.
- Verify the DTC C1241 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- C1241 is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
