DESCRIPTION
DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
---|---|---|---|---|---|---|
C1203 | ECM Communication Circuit | 1161 | Either of the following is detected:
|
| Comes on |
HINT:
|
NOTICE:
DTC C1203 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from those stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.
MONITOR DESCRIPTION
When the vehicle is being driven, if the vehicle information, drive type or steering wheel position cannot be confirmed, the memorized data does not match or other related information cannot be stored such as when the ECU that was installed when the vehicle left the factory is changed or the EEPROM is malfunctioning, the skid control ECU (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
MONITOR STRATEGY
Related DTCs | C124A: CAN communication identification signal |
Required Sensors/Components(Main) | Skid control ECU (brake booster with master cylinder assembly) |
Required Sensors/Components(Related) | Skid control ECU (brake booster with master cylinder assembly) Speed sensor |
Frequency of Operation | Continuous |
Duration | - |
MIL Operation | Immediately |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored | None |
All of the following conditions are met | - |
EEPROM read-in | Complete |
IG1 | On |
Vehicle speed | 40 km/h (25 mph) or more |
TYPICAL MALFUNCTION THRESHOLDS
Both of the following conditions are met | A and B |
A. Test Mode | Off |
B. One of the following conditions is met | - |
Grade info | Undetermined or different from a storage memory |
Drive train info | Undetermined or different from a storage memory |
Steering info | Undetermined or different from a storage memory |
Car spec info | There is no write-in |
COMPONENT OPERATING RANGE
All of the following conditions are met | - |
EEPROM read-in | Complete |
IG1 | On |
Test Mode | Off |
Grade info | Decision and concordance from a storage memory |
Drive train info | Decision and concordance from a storage memory |
Steering info | Decision and concordance from a storage memory |
Car spec info | There is write-in |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
HINT:
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
PROCEDURE
1. | CHECK PART NUMBER |
(a) Check that the proper hybrid vehicle control ECU and main body ECU (multiplex network body ECU) are installed.
OK:
Proper ECUs are installed.
(b) Check if the hybrid vehicle control ECU and main body ECU (multiplex network body ECU) were replaced before the DTC was recorded.
OK:
ECUs were not replaced.
Result | Proceed to |
---|---|
OK | A |
NG (A proper hybrid vehicle control ECU is not installed and/or the hybrid vehicle control ECU was replaced.) | B |
NG (A proper main body ECU (multiplex network body ECU) is not installed and/or the main body ECU (multiplex network body ECU) was replaced.) | C |
B | REPLACE HYBRID VEHICLE CONTROL ECU |
C | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
2. | PERFORM INITIALIZATION |
(a) Perform linear solenoid valve offset learning, ABS holding solenoid valve learning and system information memorization.
Click here
Chassis > ABS/VSC/TRAC > Utility Tester Display |
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ECB Utility |
(b) Perform yaw rate and acceleration sensor zero point calibration.
Click here
Chassis > ABS/VSC/TRAC > Utility Tester Display |
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Test Mode |
HINT:
|
3. | RECONFIRM DTC |
(a) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC > Clear DTCs(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is output.
Click here
Chassis > ABS/VSC/TRAC > Trouble Codes Result | Proceed to |
---|---|
DTC C1203 is output. | A |
DTC C1203 is not output. | B |
A | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
B | END |