BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1241,C1242; Low or High Power Supply Voltage; 2020 MY RAV4 RAV4 HV [06/2020

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001O4J9
Model Year Start: 2020	Model: RAV4	Prod Date Range: [06/2020 - 08/2020]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1241,C1242; Low or High Power Supply Voltage; 2020 MY RAV4 RAV4 HV [06/2020 - 08/2020]

DTC

C1241

Low or High Power Supply Voltage

DTC

C1242

Open Circuit in IG1/IG2 Power Source Circuit

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake booster with master cylinder assembly) power source voltage drops, or there is insufficient voltage to operate the ABS main relay, the skid control ECU (brake booster with master cylinder assembly) will store these DTCs.

These DTCs may also be stored if the auxiliary battery voltage drops below 9.5 V.

HINT:

DTC C1256 (Accumulator Low Pressure) may also be memorized if there is a drop in power source voltage.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1241

Low or High Power Supply Voltage

101

102

551

552

553

INF Code: 101
- Any of the following is detected when the BS terminal voltage is 9.3 V or less:
  1. Vehicle not decelerated (brake pedal is not depressed) for 3 seconds or more.
  2. While depressing the brake pedal, linear solenoid current does not satisfy 1.34 A.
  3. Vehicle decelerated (brake pedal is depressed) for 0.06 seconds.
INF Code: 102
- Any of the following is detected when the ECU internal voltage is 6.8 V or less:
  1. With the ignition switch off, the main relay contact voltage does not reach 3.5 V or more continuously for 0.22 seconds or more in response to a main relay ON command.
  2. With the ignition switch off and the IG1 terminal voltage 9.5 V or less, the main relay contact voltage does not reach 3.5 V or more continuously for 0.22 seconds or more in response to a main relay ON command.
  3. Sensor supply voltage is 4.75 V or less, or 5.25 V or more for 0.06 seconds.
  4. Accumulator pressure sensor output voltage is 4.54 V or less, or 5.46 V or more for 0.06 seconds.
INF Code: 551
- When driving at 3 km/h (1.9 mph) or more, IG1 terminal voltage is 9.5 V or less, or VM1 voltage is 8.6 V or less for 10 seconds or more.
INF Code: 552
- When VM1 voltage is 8.6 V or less, sensor supply voltage is low for 60 seconds or more.
INF Code: 553
- VM1 voltage is 16.6 V or more for 0.8 seconds.

Improperly connected connector, deformation or corrosion of terminals
Auxiliary battery
Hybrid control system (Charging circuit)
Skid control ECU (Brake booster with master cylinder assembly)

C1242

Open Circuit in IG1/IG2 Power Source Circuit

111

112

INF Code: 111
- Voltage is not applied to the IG1 terminal (less than 3.5 V), and applied to the IG2 terminal (9.5 V higher than) for 4 seconds or more.
INF Code: 112
- While hybrid vehicle control ECU assembly communication is enabled, no voltage (below 3.5 V) is applied to the IG2 terminal and the power source voltage (exceeding 9.5 V) is applied to the IG1 terminal continuously for 4 seconds or more.
- When the vehicle speed exceeds 10 km/h, no voltage (below 3.5 V) is applied to the IG2 terminal and the power source voltage (exceeding 9.5 V) is applied to the IG1 terminal continuously for 4 seconds or more.

INF Code: 111
- Open or short in IG1 circuit
- Improperly connected connector, deformation or corrosion of terminals
- Smart key system (for start function) (IG start circuit)
- Auxiliary battery
- Hybrid control system (Charging circuit)
- Skid control ECU (Brake booster with master cylinder assembly)
INF Code: 112
- Open or short in IG2 circuit
- Improperly connected connector, deformation or corrosion of terminals
- Smart key system (for start function) (IG start circuit)
- Auxiliary battery
- Hybrid control system (Charging circuit)
- Skid control ECU (Brake booster with master cylinder assembly)

DTC Detection Conditions: C1241 INF Code: 101

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	BS terminal voltage is 9.3 V or less	○	○	○
Malfunction Status	Vehicle not decelerated (brake pedal is not depressed)	○	-	-
	While depressing the brake pedal, linear solenoid current does not satisfy 1.34 A	-	○	-
	Vehicle decelerated (brake pedal is depressed)	-	-	○
Detection Time		3 seconds or more	-	0.06 seconds
Number of Trips		1 trip	1 trip	1 trip

HINT:

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

DTC Detection Conditions: C1241 INF Code: 102

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	ECU internal voltage is 6.8 V or less	○	○	○	○
Malfunction Status	With the ignition switch off, the main relay contact voltage does not reach 3.5 V or more continuously for 0.22 seconds or more in response to a main relay ON command	○	-	-	-
	With the ignition switch off and the IG1 terminal voltage 9.5 V or less, the main relay contact voltage does not reach 3.5 V or more continuously for 0.22 seconds or more in response to a main relay ON command	-	○	-	-
	Sensor supply voltage is 4.75 V or less, or 5.25 V or more	-	-	○	-
	Accumulator pressure sensor output voltage is 4.54 V or less, or 5.46 V or more	-	-	-	○
Detection Time		-	-	0.06 seconds	0.06 seconds
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

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

DTC Detection Conditions: C1242 INF Code: 112

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	While hybrid vehicle control ECU assembly communication is enabled, no voltage (below 3.5 V) is applied to the IG2 terminal and the power source voltage (exceeding 9.5 V) is applied to the IG1 terminal continuously	○	-
Malfunction Status	When the vehicle speed exceeds 10 km/h, no voltage (below 3.5 V) is applied to the IG2 terminal and the power source voltage (exceeding 9.5 V) is applied to the IG1 terminal continuously	-	○
Detection Time		4 seconds or more	4 seconds or more
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.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK SMART KEY SYSTEM (for Start Function)

(a) Check if smart key system (for start function) DTCs are output.

Click here

Body Electrical > Smart Access > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

INSPECT SMART KEY SYSTEM (for Start Function)

2.	CHECK HYBRID CONTROL SYSTEM

(a) Check if hybrid control system DTCs are output.

for 2WD with NICKEL METAL HYDRIDE BATTERY: Click here

for AWD with NICKEL METAL HYDRIDE BATTERY: Click here

for LITHIUM-ION BATTERY: Click here

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

INSPECT HYBRID CONTROL SYSTEM

for 2WD with NICKEL METAL HYDRIDE BATTERY: Click here

for AWD with NICKEL METAL HYDRIDE BATTERY: Click here

for LITHIUM-ION BATTERY: Click here

CHECK DTC

(a) Check that no main relay malfunction DTCs are output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
Main relay malfunction DTCs are not output.	A
Main relay malfunction DTCs are output.	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

4.	CHECK AUXILIARY BATTERY

(a) Check the auxiliary battery voltage.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
Auxiliary battery	Ignition switch ON	11 to 14 V
Auxiliary battery	Ignition switch ON (READY)	11 to 15.5 V

CHARGE OR REPLACE AUXILIARY BATTERY

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-14 (BI) - Body ground	Always	11 to 14 V
A42-15 (BS) - Body ground	Always	11 to 14 V
A42-16 (IG1) - Body ground	Ignition switch ON	11 to 14 V
A42-12 (IG2) - Body ground	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

6.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-28 (GND) - Body ground	Always	Below 1 Ω
A42-27 (GND2) - Body ground	Always	Below 1 Ω
A42-26 (GND3) - Body ground	Always	Below 1 Ω
A42-25 (GND4) - Body ground	Always	Below 1 Ω
A42-24 (GND5) - Body ground	Always	Below 1 Ω
A42-23 (GND6) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

7.	RECONFIRM DTC

(a) Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(d) Turn the ignition switch to ON (READY).

(e) Perform a road test.

(f) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTCs C1241 and C1242 are not output.	A
DTCs C1241 and/or C1242 are output.	B

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

Click here

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY