RM3660EC _51 Engine / Hybrid System _080774 STOP AND START _0393362 STOP AND START SYSTEM C

STOP AND START  STOP AND START SYSTEM  P055511  Brake Booster Pressure Sensor Circuit Short to Ground  P055515  Brake Booster Pressure Sensor Circuit Short to Battery or Open  


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.

A280541E16
0.063,0.052 1.896,0.25 1.833,0.198 10 false Vacuum Sensor Voltage: 0.833,0.51 1.667,0.75 0.833,0.24 10 false Voltage (V) 0.938,0.781 1.292,1.01 0.354,0.229 10 false 5.0 0.938,1.188 1.292,1.385 0.354,0.198 10 false 4.5 0.792,2.49 1.281,2.677 0.49,0.188 10 false 0.354 1.063,2.896 1.344,3.083 0.281,0.188 10 false 0 2.531,1.792 3.74,1.99 1.208,0.198 10 false Normal Range 2.448,0.875 3.479,1.229 1.031,0.354 10 true Abnormal Range 2.479,2.573 3.5,2.927 1.021,0.354 10 true Abnormal Range

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):
·

Short in vacuum sensor assembly circuit.

·

Ignition switch ON.


·

Wire harness or connector

·

Vacuum sensor assembly

·

Engine stop and start ECU


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):
·

Open or short in vacuum sensor assembly circuit.

·

Ignition switch ON.


·

Wire harness or connector

·

Vacuum sensor assembly

·

Engine stop and start ECU


Blinks DTC stored SAE Code: P0558

CONFIRMATION DRIVING PATTERN

CONFIRMATION AFTER TROUBLESHOOTING


HINT:
·

If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

·

If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

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.

·

After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

·

Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.



a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs
50002 392

e.

Start the engine and allow it to idle for 15 seconds or more.


f.

Stop the engine and turn the ignition switch to ON.


g.

Turn the GTS on.


h.

Enter the following menus: Powertrain / Stop and Start / Data List / Brake Boost Pressure.

Powertrain > Stop and Start > Data List
Tester Display
Brake Boost Pressure
50003 392 215

i.

While depressing the brake pedal several times, check that the Brake Boost Pressure value changes.


j.

Check that DTCs are not output.

Powertrain > Stop and Start > Trouble Codes
50001 392


STOP AND START SYSTEM OPERATION CHECK


Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>OPERATION CHECK


WIRING DIAGRAM

A347857E36
2.167,0.396 2.479,0.594 0.313,0.198 10 false VC 2.51,0.375 2.677,0.552 0.167,0.177 10 false 3 2.167,0.854 2.479,1.052 0.313,0.198 10 false PB 2.521,0.844 2.688,1.021 0.167,0.177 10 false 2 2.531,1.313 2.698,1.49 0.167,0.177 10 false 1 2.177,1.313 2.49,1.51 0.313,0.198 10 false E2 4.76,1.427 5.375,1.625 0.615,0.198 10 false BRE2 4.771,0.969 5.083,1.167 0.313,0.198 10 false PB 4.76,0.5 5.375,0.698 0.615,0.198 10 false BRVC 4.469,0.385 4.781,0.583 0.313,0.198 10 false 14 4.479,0.844 4.792,1.042 0.313,0.198 10 false 13 4.521,1.313 4.688,1.49 0.167,0.177 10 false 3 4.469,1.885 4.927,2.083 0.458,0.198 10 false A124 4.469,2.042 6.292,2.281 1.823,0.24 10 false Engine Stop and Start ECU 0.885,1.854 1.344,2.052 0.458,0.198 10 false A59 0.885,2.031 2.865,2.229 1.979,0.198 10 false Vacuum Sensor Assembly

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

After replacing the engine stop and start ECU or airbag sensor with ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

After replacing the engine stop and start ECU assembly, perform learning of the external backup boost converter (eco run vehicle converter assembly).

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION



HINT:
·

Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>FREEZE FRAME DATA

·

DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>DTC CHECK / CLEAR



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (PB TERMINAL VOLTAGE)
A419453C97
3.25,0.479 3.771,0.792 0.521,0.313 4.177,2.25 4.042,1.344 true 3.302,2.24 3.938,1.24 true 3.083,2.292 3.865,2.49 0.781,0.198 10 false BRE2 4.083,2.281 4.74,2.469 0.656,0.188 10 false PB 3.365,0.542 3.74,0.74 0.375,0.198 10 false A124 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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 Condition Specified Condition
A124-13 (PB) - A124-3 (BRE2) Ignition switch ON Higher than 0.6 V or below 4.7 V



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

2.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - VACUUM SENSOR ASSEMBLY)
2.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - VACUUM SENSOR ASSEMBLY)
a.

Disconnect the engine stop and start ECU connector.


b.

Disconnect the vacuum sensor assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A124-13 (PB) - A59-2 (PB) Always Below 1 Ω
A124-14 (BRVC) - A59-3 (VC) Always Below 1 Ω
A124-3 (BRE2) - A59-1 (E2) Always Below 1 Ω
A124-13 (PB) or A59-2 (PB) - Body ground and other terminals Always 10 kΩ or higher
A124-14 (BRVC) or A59-3 (VC) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

3.CHECK ENGINE STOP AND START ECU (BRVC TERMINAL VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK ENGINE STOP AND START ECU (BRVC TERMINAL VOLTAGE)
A419453C98
3.25,0.479 3.771,0.792 0.521,0.313 4.177,2.25 4,1.344 true 3.302,2.24 3.938,1.24 true 3.083,2.292 3.865,2.49 0.781,0.198 10 false BRE2 4.042,2.281 4.698,2.469 0.656,0.188 10 false BRVC 3.354,0.542 3.729,0.74 0.375,0.198 10 false A124 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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 Condition Specified Condition
A124-14 (BRVC) - A124-3 (BRE2) Ignition switch ON 4.5 to 5.5 V



Result:
Proceed to
OK
NG



OK

4.REPLACE VACUUM SENSOR ASSEMBLY

NG

REPLACE ENGINE STOP AND START ECU

Click hereEngine / Hybrid System>STOP AND START>ENGINE STOP AND START ECU>REMOVAL


5.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Stop and Start / Trouble Codes.


e.

Clear the DTC.

Powertrain > Stop and Start > Clear DTCs
50002 392

Result:
Proceed to
NEXT



NEXT

6.CHECK DTC OUTPUT
6.CHECK DTC OUTPUT
a.

Enter the following menus: Powertrain / Stop and Start / Trouble Codes.


b.

Check that no DTCs are output.

Powertrain > Stop and Start > Trouble Codes
50001 392
Result:
Result Proceed to
DTCs are not output A
DTC P055511 or P055515 is output B




A

END

B

REPLACE ENGINE STOP AND START ECU

Click hereEngine / Hybrid System>STOP AND START>ENGINE STOP AND START ECU>REMOVAL