| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001HG90 |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [02/2019 - 12/2021] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1311,C1312; Open Circuit in Main Relay 1; 2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021] | ||
|
DTC |
C1311 |
Open Circuit in Main Relay 1 |
|
DTC |
C1312 |
Short Circuit in Main Relay 1 |
DESCRIPTION
The ABS main relay supplies power to the changeover solenoid and the linear solenoid.
The ABS main relay remains on for approximately 2 minutes after the ignition switch is turned off and the input of brake pedal operation signals stops, and supplies power to the system to keep it ready to operate.
|
DTC No. |
Detection Item |
INF Code |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|---|
|
C1311 |
Open Circuit in Main Relay 1 |
1 |
Either of the following is detected:
|
|
- |
|
C1312 |
Short Circuit in Main Relay 1 |
2 |
The ABS main relay contact is turned ON (BS terminal voltage 3.5 V or more) for 4.5 seconds or more when the ABS main relay OFF is requested from the ECU. |
|
- |
DTC Detection Conditions: C1311
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
When the ignition switch is ON (READY) |
○ |
- |
|
When the ignition switch is off |
- |
○ |
|
|
Malfunction Status |
The ABS main relay contact is not turned ON (BS terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay ON is requested while IG1 terminal voltage is 9.5 V higher than |
○ |
- |
|
The ABS main relay contact is not turned ON (BS terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay ON is requested |
- |
○ |
|
|
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.
WIRING DIAGRAM
Refer to DTCs C1241 and C1242.
Click here
![2019 - 2020 MY RAV4 RAV4 HV [02/2019 - 06/2020]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1241,C1242; Low or High Power Supply Voltage+](/t3Portal/stylegraphics/info.gif)
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. |
PERFORM ACTIVE TEST USING TECHSTREAM (ABS MAIN RELAY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Select the Active Test on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
ECB Main Relay |
ABS main relay |
Relay ON/OFF |
ECB: Electronically Controlled Brake System |
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
|---|
|
ECB Main Relay |
(d) Select the Data List on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
ECB Main Relay |
ABS main relay |
ON or OFF |
ON: Relay on OFF: Relay off |
ECB: Electronically Controlled Brake System |
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
|---|
|
ECB Main Relay |
(e) Check that the condition of the ABS main relay observed on the Techstream changes according to the Techstream operation.
|
Result |
Proceed to |
|---|---|
|
ABS main relay in the Data List turns ON/OFF using the Active Test. |
A |
|
ABS main relay in the Data List does not change using the Active Test. |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (BS TERMINAL) |
|
(a) Turn the ignition switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A42-15 (BS) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT) |
|
|
3. |
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
(c) Turn the ignition switch off.
(d) Turn the ignition switch to ON.
(e) Check if the same DTC is output.
Click here
Chassis > ABS/VSC/TRAC > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs C1311 and C1312 are not output. |
A |
|
DTCs C1311 and/or C1312 are output. |
B |
| A |
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
4. |
CHECK HARNESS AND CONNECTOR (BI TERMINAL) |
|
(a) Turn the ignition switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A42-14 (BI) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BI CIRCUIT) |
|
|
5. |
CHECK HARNESS AND CONNECTOR (BS TERMINAL) |
|
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT) |
|
|