RM36D0EC _51 Engine / Hybrid System _087036 M20C-FKS ENGINE CONTROL _0418131 SFI SYSTEM C

M20C-FKS ENGINE CONTROL  SFI SYSTEM  P056014  System Voltage Circuit Short to Ground or Open  


MONITOR DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, Freeze Frame Data and fuel trim values. If the battery voltage falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. The next time the engine is started, the ECM will illuminate the MIL and store this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P056014 System Voltage Circuit Short to Ground or Open An open or short in the ECM backup power source circuit (1 trip detection logic).
·

Open or short in back up power source circuit

·

Battery

·

Battery terminals

·

ECM


Comes on DTC stored SAE: P0562

MONITOR STRATEGY

Required Sensors/Components ECM
Frequency of Operation Continuous

TYPICAL MALFUNCTION THRESHOLDS

Continuous battery voltage Less than 3.5 V

CONFIRMATION DRIVING PATTERN

HINT:
·

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

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

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

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Wait 5 seconds or more [B].

9.

Enter the following menus: Powertrain / Engine / Trouble Codes [C].

10.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



11.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

12.

Input the DTC: P056014.

13.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions



HINT:
·

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

·

If the judgment result is ABNORMAL, the system is malfunctioning.

·

[A] to [C]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




WIRING DIAGRAM

A436242E08
0.885,2.677 1.958,2.875 1.073,0.198 10 false Battery 3.583,1.156 4.656,1.354 1.073,0.198 10 false EFI NO. 1 5.281,0.833 6.354,1.031 1.073,0.198 10 false BATT 5.021,0.833 5.271,1.083 0.25,0.25 10 false 31 5.021,2.25 5.271,2.5 0.25,0.25 10 false 22 5.313,2.365 5.563,2.615 0.25,0.25 10 false E1 5.823,3.042 6.26,3.323 0.438,0.281 10 false A125 5.823,3.208 6.26,3.458 0.438,0.25 10 false ECM

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY

·

When disconnecting and reconnecting the battery.

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART




HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.INSPECT BATTERY
a.

Inspect the battery.

Click herePower Source / Network>M20C-FKS (BATTERY / CHARGING)>CHARGING SYSTEM>ON-VEHICLE INSPECTION

OK:

Battery voltage is between 11 and 14 V.



Result:
Proceed to
OK
NG



OK

2.CHECK BATTERY TERMINAL

NG

CHARGE OR REPLACE BATTERY

2.CHECK BATTERY TERMINAL
a.

Check that the battery terminals are not loose or corroded.

OK:

Battery terminals are not loose or corroded.



Result:
Proceed to
OK
NG



OK

3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)

NG

REPAIR OR REPLACE BATTERY TERMINAL

3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)
A534801C03
1.656,0.313 2.042,0.542 0.385,0.229 0.573,2.917 1.177,1.573 true 0.115,0.135 0.427,0.333 0.313,0.198 10 false *a 0.396,2.969 0.896,3.177 0.5,0.208 10 false BATT 1.688,0.354 2.104,0.604 0.417,0.25 10 false A125
*a Front view of wire harness connector
(to ECM)


a.

Disconnect the ECM connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A125-31 (BATT) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CLEAR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM)

4.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

5.CHECK WHETHER DTC OUTPUT RECURS (DTC P056014)
5.CHECK WHETHER DTC OUTPUT RECURS (DTC P056014)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Enter the following menus: Powertrain / Engine / Trouble Codes.


c.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372

Result:
Result Proceed to
DTCs are not output A
DTC P056014 is output B



A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>ECM>REMOVAL