Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000014VM3
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 - 09/2018]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1203; ECM Communication Circuit; 2018 MY Camry HV [07/2017 - 09/2018]

DTC

C1203

ECM Communication Circuit

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) stores identification information sent from other ECUs when the vehicle is shipped from the factory and changes the control constant for each system (ABS, VSC, TRAC, etc.) based on the identification information.

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.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1203

ECM Communication Circuit

1161

Either of the following is detected:

  1. Identification information sent from other ECUs does not match with the value stored when shipped from the factory.
  2. Identification information sent from other ECUs is not stored when shipped from the factory.
  • Other ECUs are not installed correctly
  • Skid control ECU (brake booster with master cylinder assembly)

Electronically controlled brake system DTC

HINT:

  • The DTC is cleared when the conditions return to normal.
  • This DTC is stored when incorrect identification information is detected and is not due to an ECM communication error.

DTC Detection Conditions: C1203 INF Code: 1161

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

Identification information sent from other ECUs does not match with the value stored when shipped from the factory.

○

-

Identification information sent from other ECUs is not stored when shipped from the factory.

-

○

Detection Time

-

-

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

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 2018 MY Camry HV [07/2017 - 09/2018]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: INITIALIZATION

PROCEDURE

1.

CHECK PART NUMBER

(a) Check that the proper hybrid vehicle control ECU assembly and main body ECU (multiplex network body ECU) are installed.

OK:

Proper ECUs are installed.

(b) Check if the hybrid vehicle control ECU assembly 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 assembly is not installed and/or the hybrid vehicle control ECU assembly 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 ASSEMBLY

C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

A

2.

PERFORM INITIALIZATION

(a) Perform linear solenoid valve offset learning, ABS holding solenoid valve learning and system information memorization.

Click here 2018 MY Camry HV [07/2017 - 09/2018]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: INITIALIZATION

Chassis > ABS/VSC/TRAC > Utility

Tester Display

ECB Utility

(b) Perform yaw rate and acceleration sensor zero point calibration.

Click here 2018 MY Camry HV [07/2017 - 09/2018]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: CALIBRATION

Chassis > ABS/VSC/TRAC > Utility

Tester Display

Test Mode

HINT:

  • After installing a new skid control ECU (brake booster with master cylinder assembly), before performing linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization, DTC C1203 will be output.
  • If linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization are not performed, DTC C1203 will be output after the data stored in the skid control ECU (brake booster with master cylinder assembly) is cleared by performing "Reset Memory" using Techstream.
NEXT

3.

RECONFIRM DTC

(a) Clear the DTCs.

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.

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