Lexus ES: HV Control System Regenerative Malfunction (C1259,C1310)
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) communicates with the hybrid vehicle control ECU and controls braking force according to the motor's regenerative force.
The skid control ECU (brake booster with master cylinder assembly) sends enhanced-VSC signals to the hybrid vehicle control ECU and receives operating signals from the hybrid vehicle control ECU.
The skid control ECU (brake booster with master cylinder assembly) uses CAN communication for communicating with the hybrid vehicle control ECU. If a communication malfunction is detected, the skid control ECU (brake booster with master cylinder assembly) prohibits enhanced-VSC operation, brake hold operation and part of the electronically controlled brake system control as a fail-safe function.
If the signals from the hybrid vehicle control ECU return to normal, the warning light will go off and the DTCs C1259 and C1310 will be cleared.
HINT:
These DTCs will be output from the skid control ECU (brake booster with master cylinder assembly) when the hybrid vehicle control ECU sends a malfunction signal to the skid control ECU (brake booster with master cylinder assembly).
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1259 | HV Control System Regenerative Malfunction | 1132 | A regeneration malfunction signal is input for at least 0.036 seconds when IG2 terminal voltage is 9.5 V or more for at least 2 seconds and communication with the hybrid vehicle control ECU is valid. |
| Does not come on | Electronically controlled brake system DTC HINT: The DTC is cleared when the conditions return to normal. |
| C1310 | HV System Malfunction | 1140 1141 |
|
| Does not come on |
|
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".
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PROCEDURE
| 1. | CHECK DTC (HYBRID CONTROL SYSTEM) |
(a) Check if a hybrid control system DTCs are output.
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| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B |  | INSPECT HYBRID CONTROL SYSTEM |
|
| 2. | CHECK DTC (MOTOR GENERATOR CONTROL SYSTEM) |
(a) Check if a motor generator control system DTCs are output.
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| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B | | INSPECT MOTOR GENERATOR CONTROL SYSTEM |
|
| 3. | CHECK DTC (SFI SYSTEM) |
(a) Check if a SFI system DTCs are output.
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| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B | | INSPECT SFI SYSTEM |
|
| 4. | RECONFIRM DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is output.
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| Result | Proceed to |
|---|---|
| DTCs C1259 and/or C1310 are output. | A |
| DTCs other than C1259 and C1310 are output. | B |
| DTCs are not output. | C |
| A | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| B | | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
| C | | USE SIMULATION METHOD TO CHECK |
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