RM38T0EC _51 Engine / Hybrid System _144957 HYBRID / BATTERY CONTROL _0604232 HYBRID CONTROL SYSTEM C

HYBRID / BATTERY CONTROL  HYBRID CONTROL SYSTEM  P1CFA12  IGB Signal Circuit Short to Auxiliary Battery  


DESCRIPTION

The hybrid vehicle control ECU monitors the IGB signal received from the certification ECU (smart key ECU assembly). When an error is detected in the IGB signal, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Note
P1CFA12 IGB Signal Circuit Short to Auxiliary Battery An IGB signal from the hybrid vehicle control ECU is on when the ignition switch is off.
(1 trip detection logic)
·

Wire harness or connector

·

Hybrid vehicle control ECU

·

Certification ECU (smart key ECU assembly)


Does not come on Master Warning:
Comes on 		SAE Code:
P1CFC

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>UTILITY


1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4.

Turn the ignition switch off and wait for 2 minutes or more.

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

7.

Check the DTC judgment result.

HINT:
·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform driving pattern again.




WIRING DIAGRAM

A525278E12
0.219,3.083 3.094,3.458 2.875,0.375 10 false Certification ECU (Smart Key ECU Assembly) 1.719,1.542 2.198,1.854 0.479,0.313 10 false IGB 2.094,1.542 2.385,1.854 0.292,0.313 10 false 1 5.021,1.531 5.313,1.781 0.292,0.25 10 false 5 5.24,1.531 5.646,1.802 0.406,0.271 10 false IGB 4.906,3.104 6.76,3.677 1.854,0.573 10 false Hybrid Vehicle Control ECU 4.906,2.938 5.74,3.135 0.833,0.198 10 false I278 0.24,2.906 0.698,3.156 0.458,0.25 10 false I223

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.


PROCEDURE

1.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P056014

Result:
Proceed to
OK
NG



OK

2.CHECK CONNECTOR CONNECTION CONDITION (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

NG

CONNECT SECURELY

2.CHECK CONNECTOR CONNECTION CONDITION (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
a.

Check the connector connection condition of the certification ECU (smart key ECU assembly).

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE

OK:

The connector is connected securely and there are no contact problems.



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (IGB TERMINAL VOLTAGE)

NG

CONNECT SECURELY

3.CHECK HARNESS AND CONNECTOR (IGB TERMINAL VOLTAGE)
a.

Turn the ignition switch off.


b.

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

A502139C76
4.688,0.229 5.156,0.51 0.469,0.281 5.802,2.292 5.25,1.292 true 0.271,0.167 0.583,0.323 0.313,0.156 10 false *a 5.719,2.344 6.031,2.5 0.313,0.156 10 false IGB 4.792,0.271 5.104,0.427 0.313,0.156 10 false I278
*a Component with harness connected
(Hybrid Vehicle Control ECU) 		- -


Standard Voltage:
Tester Connection Condition Specified Condition
I278-5 (IGB) - Body ground Ignition switch off Below 1 V



Result:
Proceed to
OK
NG



OK

REPLACE HYBRID VEHICLE CONTROL ECU

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


NG

4.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
4.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
a.

Disconnect the certification ECU (smart key ECU assembly) connector.


b.

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

A502139C76
4.688,0.229 5.156,0.51 0.469,0.281 5.802,2.292 5.25,1.292 true 0.271,0.167 0.583,0.323 0.313,0.156 10 false *a 5.719,2.344 6.031,2.5 0.313,0.156 10 false IGB 4.792,0.271 5.104,0.427 0.313,0.156 10 false I278
*a Component with harness connected
(Hybrid Vehicle Control ECU) 		- -


Standard Voltage:
Tester Connection Condition Specified Condition
I278-5 (IGB) - Body ground Ignition switch off Below 1 V



c.

Reconnect the certification ECU (smart key ECU assembly) connector.


Result:
Proceed to
OK
NG



OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR