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

M20C-FKS ENGINE CONTROL  SFI SYSTEM  P12D41D  Fuel Pump Control Circuit Current Out of Range  


DESCRIPTION

Refer to DTC P062712.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>P062712

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P12D41D Fuel Pump Control Circuit Current Out of Range When the fuel pump control ECU operation duty ratio is 3 to 65%, overcurrent in the fuel pump circuit is detected for 3 seconds or more (2 trip detection logic).
·

Short in fuel pump control ECU circuit

·

Fuel pump (for low pressure side)

·

Fuel pump (for low pressure side) locked

·

Foreign matter in the fuel

·

Fuel pump control ECU


Comes on DTC stored SAE: P12D4

Related Data List
DTC No. Data List
P12D41D Fuel Pump Control Duty Ratio

MONITOR DESCRIPTION

The fuel pump control ECU monitors the fuel pump drive circuit.

When a malfunction is detected in the fuel pump drive circuit, the diagnosis output circuit in the fuel pump control ECU modifies the operation signal sent by the ECM to indicate that there is a malfunction.

When the fuel pump control ECU operation duty ratio is 3 to 65% and overcurrent in the fuel pump circuit is detected for 3 seconds or more, the diagnosis output circuit in the fuel pump control ECU modifies the operation signal sent by the ECM to indicate that there is a malfunction and the ECM stores a DTC.

A404864E02
6.479,3.844 6.969,4.125 0.49,0.281 10 false ECM 6.219,2.26 6.677,2.458 0.458,0.198 10 false FPC 2.573,5.385 4.26,5.698 1.688,0.313 10 false Fuel Pump Control ECU 5.563,1.906 5.875,2.104 0.313,0.198 10 false *1 5.563,2.792 5.875,2.99 0.313,0.198 10 false *2 2.969,2.5 4.167,2.99 1.198,0.49 10 false Fuel Pump Control Circuit 3.052,3.688 3.927,4.208 0.875,0.521 10 false Diagnosis Output Circuit 1.917,2.125 2.677,2.531 0.76,0.406 10 false Fuel Pump Drive Circuit 0.135,3.875 1.354,4.292 1.219,0.417 10 false Fuel Pump (for Low Pressure Side) 1.479,1.854 1.938,2.052 0.458,0.198 10 false FPU 1.49,2.385 1.948,2.583 0.458,0.198 10 false FPV 1.479,2.927 1.938,3.125 0.458,0.198 10 false FPW 4.75,2.24 5.208,2.438 0.458,0.198 10 false FPC 0.552,5.938 6.823,6.135 6.271,0.198 10 false *1: Fuel Pump Control Signal (Duty-cycle) 0.573,6.302 4.885,6.698 4.313,0.396 10 false *2: Diagnosis Output Signal (Fuel Pump Control Signal Modified) 0.854,0.438 2.542,0.74 1.688,0.302 10 false Fuel Pump Drive Circuit

MONITOR STRATEGY

Required Sensors/Components Fuel pump control ECU
Frequency of Operation Continuous

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.

Start the engine and wait 10 seconds or more [A].

7.

Turn the GTS on.

8.

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

9.

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.



10.

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

11.

Input the DTC: P12D41D.

12.

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.

·

If the judgment result is INCOMPLETE, run the engine at an engine speed of 2000 rpm or more for 10 seconds or more and check the DTC judgment result again.

·

[A] to [B]: 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.




CAUTION / NOTICE / HINT

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 FUEL PUMP CONTROL ECU
A459398C14
2.677,0.302 3.094,0.604 0.417,0.302 4.135,0.323 4.573,0.615 0.438,0.292 3.115,2.323 3,1.5 true 2.656,2.323 2.719,1.51 true 2.198,2.323 2.448,1.479 true 3.927,2.333 4.167,1.375 true 0.125,0.052 0.479,0.396 0.354,0.344 10 false *1 2.76,0.365 3.219,0.563 0.458,0.198 10 false N14 4.219,0.375 4.677,0.573 0.458,0.198 10 false N15 3,2.354 3.458,2.552 0.458,0.198 10 false FPU 2.5,2.354 2.958,2.552 0.458,0.198 10 false FPV 1.979,2.354 2.479,2.667 0.5,0.313 10 false FPW 3.781,2.375 4.188,2.615 0.406,0.24 10 false GND
*1 Fuel Pump Control ECU - -


HINT:

The illustration is for reference only, actual parts may differ.


a.

Remove the fuel pump control ECU.

Click hereEngine / Hybrid System>M20C-FKS (FUEL)>FUEL PUMP ECU>REMOVAL


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N14-2 (FPU) - N15-3 (GND) Always 2 kΩ or higher
N14-3 (FPV) - N15-3 (GND) Always 2 kΩ or higher
N14-4 (FPW) - N15-3 (GND) Always 2 kΩ or higher


HINT:

This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.



Result:
Proceed to
OK
NG



OK

2.PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)

NG

REPLACE FUEL PUMP CONTROL ECU

Click hereEngine / Hybrid System>M20C-FKS (FUEL)>FUEL PUMP>REMOVAL


2.PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)
A459399C18
2.573,0.25 2.99,0.5 0.417,0.25 2.177,2.313 2.469,1.469 true 2.823,2.302 2.75,1.49 true 3.479,2.323 3.063,1.469 true 0.156,0.125 0.469,0.281 0.313,0.156 10 false *1 2.667,0.292 3.104,0.5 0.438,0.208 10 false N14 1.958,2.354 2.396,2.563 0.438,0.208 10 false FPW 2.688,2.354 3.125,2.563 0.438,0.208 10 false FPV 3.396,2.354 3.833,2.563 0.438,0.208 10 false FPU
*1 Fuel Pump Control ECU - -


HINT:

The illustration is for reference only, actual parts may differ.


a.

Disconnect the fuel pump control ECU connector.


b.

Connect the GTS to the DLC3.


c.

Turn the ignition switch to ON.


d.

Turn the GTS on.


e.

Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.

Powertrain > Engine > Active Test
Tester Display
Fuel Pump Single Phase Energization
50004 372 49

f.

Operate the fuel pump control ECU using the Active Test function and measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection GTS Operation Specified Condition
N14-2 (FPU) - Body ground U Phase 4.4 to 8.4 V*
N14-3 (FPV) - Body ground 8 to 15.5 V
N14-4 (FPW) - Body ground 8 to 15.5 V
N14-3 (FPV) - Body ground V Phase 4.4 to 8.4 V*
N14-2 (FPU) - Body ground 8 to 15.5 V
N14-4 (FPW) - Body ground 8 to 15.5 V
N14-4 (FPW) - Body ground W Phase 4.4 to 8.4 V*
N14-2 (FPU) - Body ground 8 to 15.5 V
N14-3 (FPV) - Body ground 8 to 15.5 V


HINT:
·

*: This Active Test limits the fuel pump control ECU output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU will be approximately 50% of the power source voltage (+B terminal).

·

Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).




Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE))

NG

REPLACE FUEL PUMP CONTROL ECU

Click hereEngine / Hybrid System>M20C-FKS (FUEL)>FUEL PUMP ECU>REMOVAL


3.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE))
a.

Disconnect the fuel pump control ECU connector.


b.

Disconnect the fuel pump (for low pressure side) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N14-2 (FPU) or N26-3 (BLPU) - Other terminals Always 10 kΩ or higher
N14-3 (FPV) or N26-4 (BLPV) - Other terminals Always 10 kΩ or higher
N14-4 (FPW) or N26-2 (BLPW) - Other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.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

6.CHECK WHETHER DTC OUTPUT RECURS (DTC P12D41D)
6.CHECK WHETHER DTC OUTPUT RECURS (DTC P12D41D)
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
OK:

DTCs are not output.



Result:
Proceed to
NEXT



NEXT

END