RM38N0EC _51 Engine / Hybrid System _111803 STOP AND START _0509671 STOP AND START SYSTEM C

STOP AND START  STOP AND START SYSTEM  P253014  Ignition Switch Circuit Short to Ground or Open  


DESCRIPTION

If the engine stop and start ECU receives the OFF signal from the certification ECU (smart key ECU assembly) when communication with the ECM is normal, the engine stop and start ECU will output DTC P253014.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
P253014 Ignition Switch Circuit Short to Ground or Open All of the following conditions are met for 10 seconds or more (1 trip detection logic):
·

Ignition switch off signal is input.

·

Communication with the ECM is normal.

·

Ignition switch (communication) to ON.


·

Wire harness or connector

·

EFI-MAIN NO. 1 relay

·

IGP relay

·

Certification ECU (Smart key ECU assembly)

·

Engine stop and start ECU


Does not come on SAE Code: P2531

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.

Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs
50002 392

b.

Start the engine and warm it up.


c.

Drive the vehicle at 7 km/h (4.3 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.



d.

Depress the brake pedal and stop the vehicle.


e.

Keep the engine stopped by stop and start control for 10 second or more. (Keep the shift lever in D.)


f.

Release the brake pedal with the shift lever in D to start the engine.


g.

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

A514568E02
6.156,3.094 6.469,3.292 0.313,0.198 10 false +B 5.729,3.104 6.188,3.302 0.458,0.198 10 false A106 5.906,2.865 6.063,3.063 0.156,0.198 10 false 1 3.865,3.75 6.01,3.948 2.146,0.198 10 false EFI-MAIN NO. 1 4.688,3.01 4.844,3.208 0.156,0.198 10 false 5 3.948,3 4.104,3.198 0.156,0.198 10 false 3 3.938,3.323 4.094,3.521 0.156,0.198 10 false 1 4.688,3.323 4.844,3.521 0.156,0.198 10 false 2 4.885,3.24 6.26,3.438 1.375,0.198 10 false EFI NO. 2 6.156,0.677 6.615,0.875 0.458,0.198 10 false IGP 5.719,0.677 6.177,0.875 0.458,0.198 10 false A104 5.844,0.479 6.156,0.677 0.313,0.198 10 false 18 4.448,0.833 6.438,1.031 1.99,0.198 10 false ECU-IGP NO. 3 3.469,1.417 4.844,1.615 1.375,0.198 10 false IGP 3.99,0.563 4.146,0.76 0.156,0.198 10 false 3 3.083,0.563 3.24,0.76 0.156,0.198 10 false 5 3.99,0.958 4.146,1.156 0.156,0.198 10 false 2 3.063,0.969 3.219,1.167 0.156,0.198 10 false 1 1.531,1.99 2.146,2.188 0.615,0.198 10 false IGPD 1.292,1.885 1.604,2.083 0.313,0.198 10 false 24 1,2.385 2.813,2.792 1.813,0.406 10 false Certification ECU (Smart Key ECU Assembly) 6.01,5.042 7.083,5.438 1.073,0.396 10 false Engine Stop and Start ECU 3.427,4.469 4.042,4.667 0.615,0.198 10 false MREL 3.906,4.365 4.146,4.583 0.24,0.219 10 false 26 3.469,4.833 3.927,5.031 0.458,0.198 10 false ECM 3.052,4.833 3.438,5.031 0.385,0.198 10 false A109 1.021,2.229 1.479,2.427 0.458,0.198 10 false A15 0.396,4.417 1.469,4.615 1.073,0.198 10 false Battery 0.25,3.854 2.24,4.052 1.99,0.198 10 false FL MAIN 1.635,0.823 3.01,1.021 1.375,0.198 10 false IGP 1.125,3.604 3.271,3.802 2.146,0.198 10 false EFI MAIN NO. 1

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, 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

·

Inspect the fuses for circuits related to this system before performing the following procedure.



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.



PROCEDURE

1.READ VALUE USING GTS (IG SWITCH)
a.

According to the display on the GTS, read the Data List.

Powertrain > Stop and Start > Data List
Tester Display
IG Switch
50003 392 203
Result:
Tester Display Result Proceed to
IG Switch ON A
OFF B




A

USE SIMULATION METHOD TO CHECK

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


B

2.CHECK ENGINE STOP AND START ECU (IGP TERMINAL VOLTAGE)
2.CHECK ENGINE STOP AND START ECU (IGP TERMINAL VOLTAGE)
A454171C29
4.625,0.479 5.146,0.792 0.521,0.313 5.385,2.135 5.083,1.531 true 5.396,2.177 6.052,2.365 0.656,0.188 10 false IGP 4.74,0.552 5.115,0.75 0.375,0.198 10 false A104 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 Switch Condition Specified Condition

Click Location & Routing(A104)Location & Routing

Click Connector(A104)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A104-18 (IGP) - Body ground Ignition switch ON 9.5 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

5.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - IGP RELAY)
3.CHECK ENGINE STOP AND START ECU (+B TERMINAL VOLTAGE)
A454171C30
3.208,0.417 3.729,0.729 0.521,0.313 4.375,2.042 4.135,1.25 true 4.323,2.104 4.979,2.292 0.656,0.188 10 false +B 3.292,0.49 3.667,0.688 0.375,0.198 10 false A106 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

Click Location & Routing(A106)Location & Routing

Click Connector(A106)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A106-1 (+B) - Body ground Ignition switch ON 9.5 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE STOP AND START ECU

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM CANCEL SWITCH ASSEMBLY>REMOVAL


NG

4.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EFI-MAIN NO. 1 RELAY)
4.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EFI-MAIN NO. 1 RELAY)
a.

Disconnect the engine stop and start ECU connector.


b.

Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(A106)Location & Routing

Click Connector(A106)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A106-1 (+B) - 5 (EFI-MAIN NO. 1 relay holder) Always Below 1 Ω
A106-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
5 (EFI-MAIN NO. 1 relay holder) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - IGP RELAY)
a.

Disconnect the engine stop and start ECU connector.


b.

Remove the IGP relay from the No. 1 engine room relay block and No. 1 junction block assembly


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(A104)Location & Routing

Click Connector(A104)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A104-18 (IGP) - 3 (IGP relay holder) Always Below 1 Ω
A104-18 (IGP) - Body ground and other terminals Always 10 kΩ or higher
3 (IGP relay holder) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO SMART ENTRY AND START SYSTEM

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>Power Source Mode does not Change to ON (IG)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR