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DESCRIPTION
| DTC Code | Diag Code | DTC Detection Condition | Trouble Area |
| C1225 | 25 |
When any of the
following is detected:
|
• Brake actuator assembly • SMC1 or SMC2 circuit • Skid control ECU |
CIRCUIT DIAGRAM
Refer to DTCs C0226, C0236, C0246, C0256 and
C1227.
INSPECTION PROCEDURE
Detail
- Disconnect the brake actuator connector.
- Measure the resistance according to the value (s) in the table below.
Standard resistance:
Tester Connection Condition Specified Condition 16 (BS) - 10 (AST) Always Below 1 Ω 10 (AST) - Body ground Always 10 kΩ or higher 20 (SMC1+) - 13 (SMC1-) Always 31.7 to 35.7 Ω at 25ºC (77ºF) 13 (SMC1-) - Body ground Always 10 kΩ or higher 21 (SMC2+) - 8 (SMC2-) Always 31.7 to 35.7 Ω at 25ºC (77ºF) 8 (SMC2-) - Body ground Always 10 kΩ or higher
REPLACE BRAKE ACTUATOR ASSEMBLY
(See BRAKE ACTUATOR REMOVAL)
[2] CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)
- Disconnect the skid control ECU connector.
- Measure the resistance according to the value (s) in the table below.
Standard resistance:
Tester Connection Condition Specified Condition S11-6 (AST) - S22-10 (AST) Always Below 1 Ω S11-6 (AST) - Body ground Always 10 kΩ or higher S11-3 (SM1+) - S22-20 (SMC1+) Always Below 1 Ω S11-3 (SM1+) - Body ground Always 10 kΩ or higher S11-2 (SM1-) - S22-13 (SMC1-) Always Below 1 Ω S11-2 (SM1-) - Body ground Always 10 kΩ or higher S11-5 (SM2+) - S22-21 (SMC2+) Always Below 1 Ω S11-5 (SM2+) - Body ground Always 10 kΩ or higher S11-4 (SM2-) - S22-8 (SMC2-) Always Below 1 Ω S11-4 (SM2-) - Body ground Always 10 kΩ or higher S11-3 (SM1+) - S11-2 (SM1-) Always 10 kΩ or higher S11-3 (SM1+) - S11-4 (SM2-) Always 10 kΩ or higher S11-5 (SM2+) - S11-2 (SM1-) Always 10 kΩ or higher S11-5 (SM2+) - S11-4 (SM2-) Always 10 kΩ or higher S11-3 (SM1+) - S11-5 (SM2+) Always 10 kΩ or higher S11-2 (SM1-) - S11-4 (SM2-) Always 10 kΩ or higher
REPAIR OR REPLACE HARNESS OR CONNECTOR
[3] RECONFIRM DTC
- Reconnect the skid control ECU connector and the brake actuator connector.
- Clear the DTC (See Pub. No. S1-YXZE05A, page 05- 108).
- Start the engine.
- Drive the vehicle at a speed of 20 km/h (12 mph) or more
for 30 seconds or more.- Check if the same DTC is recorded (See Pub. No. S1-
YXZE05A, page 05-108).
Result:
Result Proceed to DTCs (C1225) are not output A DTCs (C1225) are output B
- If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU, with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
- If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU and brake actuator assembly. Make sure that no DTCs are output.
- If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and brake actuator assembly, inspect and repair the connector or wire harness.
- It is suspected that the DTCs were output due to a bad connection of the connector terminal.
A
CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
(See DIAGNOSIS SYSTEM).B
REPLACE SKID CONTROL ECU.
- Confirm the DTC C1225 is inactive
- Start the engine and let it idling condition.
- Verify the DTC C1225 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- C1225 is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
