DESCRIPTION
The engine stop and start ECU determines changes in the brake booster assembly pressure based on the voltage signal received from the vacuum sensor assembly in the brake booster assembly.
If the engine stop and start ECU judges that the signal received from the vacuum sensor assembly is abnormal, it stores DTC P055511 or P055515 and blinks the stop and start cancel indicator.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory | Note |
---|---|---|---|---|---|---|
P055511 | Brake Booster Pressure Sensor Circuit Short to Ground | Both of the following conditions are met for 2 seconds or more (1 trip detection logic):
|
| Blinks | DTC stored | SAE Code: P0557 |
P055515 | Brake Booster Pressure Sensor Circuit Short to Battery or Open | Both of the following conditions are met for 2 seconds or more (1 trip detection logic):
|
| Blinks | DTC stored | SAE Code: P0558 |
CONFIRMATION DRIVING PATTERN
CONFIRMATION AFTER TROUBLESHOOTING
HINT:
In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Auxiliary Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)
If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.
(a) Clear the DTCs.
Powertrain > Stop and Start > Clear DTCs(b) Start the engine and allow it to idle for 15 seconds or more.
(c) Stop the engine and turn the ignition switch to ON.
(d) Turn the GTS on.
Powertrain > Stop and Start > Data List Tester Display |
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Brake Boost Pressure |
(e) While depressing the brake pedal several times, check that the Brake Boost Pressure value changes.
(f) Check that DTCs are not output.
Powertrain > Stop and Start > Trouble CodesSTOP AND START SYSTEM OPERATION CHECK
Click here
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
Click here
HINT:
Click here
Click here
PROCEDURE
1. | CHECK HARNESS AND CONNECTOR (PB TERMINAL VOLTAGE) |
*a | Component with harness connected (Engine Stop and Start ECU) | - | - |
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Switch Condition | Specified Condition | Proceed to |
---|---|---|---|
A67-13 (PB) - A67-3 (BRE2) | Ignition switch ON | Higher than 0.6 V or below 4.7 V | A |
A67-13 (PB) - A67-3 (BRE2) | Ignition switch ON | None of the above conditions are met | B |
B |
![]() | USE SIMULATION METHOD TO CHECK |
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2. | CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - VACUUM SENSOR ASSEMBLY) |
(a) Disconnect the A67 engine stop and start ECU connector.
(b) Disconnect the A28 vacuum sensor assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A67-13 (PB) - A28-2 (PB) | Always | Below 1 Ω |
A67-14 (BRVC) - A28-3 (VC) | Always | Below 1 Ω |
A67-3 (BRE2) - A28-1 (E2) | Always | Below 1 Ω |
A67-13 (PB) - Body ground and other terminals | Always | 10 kΩ or higher |
A67-14 (BRVC) - Body ground and other terminals | Always | 10 kΩ or higher |
A67-3 (BRE2) - Body ground and other terminals | Always | 10 kΩ or higher |
A28-2 (PB) - Body ground and other terminals | Always | 10 kΩ or higher |
A28-3 (VC) - Body ground and other terminals | Always | 10 kΩ or higher |
A28-1 (E2) - Body ground and other terminals | Always | 10 kΩ or higher |
NG |
![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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3. | CHECK ENGINE STOP AND START ECU (BRVC TERMINAL VOLTAGE) |
*a | Component with harness connected (Engine Stop and Start ECU) | - | - |
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Switch Condition | Specified Condition |
---|---|---|
A67-14 (BRVC) - A67-3 (BRE2) | Ignition switch ON | 4.5 to 5.5 V |
NG |
![]() | REPLACE ENGINE STOP AND START ECU |
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4. | REPLACE VACUUM SENSOR ASSEMBLY |
Click here
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5. | CLEAR DTC |
(a) Clear the DTC.
Powertrain > Stop and Start > Clear DTCs
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6. | CHECK DTC OUTPUT |
(a) Start the engine and warm it up.
Powertrain > Stop and Start > Data List Tester Display |
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Brake Boost Pressure |
(b) While depressing the brake pedal several times, check that the Brake Boost Pressure value changes.
(c) Check that no DTCs are output.
Powertrain > Stop and Start > Trouble Codes Result | Proceed to |
---|---|
P055511 or P055515 is not output | A |
DTC P055511 or P055515 is output | B |
A |
![]() | END |
B |
![]() | REPLACE ENGINE STOP AND START ECU |
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.