M20F-FXS, M20G-FXS ENGINE CONTROL SFI SYSTEM P12D501 Fuel Pump Control General Electrical Failure
DESCRIPTION
Refer to DTC P062712.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P12D501 | Fuel Pump Control General Electrical Failure | When the fuel pump control ECU operation duty ratio is 3 to 65%, the fuel pump control ECU detects a short in the fuel pump circuit for 3 seconds or more (2 trip detection logic). | ·
Short in fuel pump control ECU circuit ·
Fuel pump (for low pressure side) ·
Fuel pump control ECU |
Comes on | SAE Code: P12D5 |
| DTC No. | Data List |
|---|---|
| P12D501 | 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%, the voltage to the fuel pump control ECU is more than a certain value 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.
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.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine and wait 10 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P12D501.
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 auxiliary 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
CAUTION / NOTICE / HINT
- NOTICE:
- ·
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
·If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
- 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
| *a | Component without harness connected
(Fuel Pump Control ECU) |
- | - |
Remove the fuel pump control ECU.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition O67-2 (FPU) - O66-3 (GND) Always 2 kΩ or higher O67-3 (FPV) - O66-3 (GND) Always 2 kΩ or higher O67-4 (FPW) - O66-3 (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
NG
| *a | Component without harness connected
(Fuel Pump Control ECU) |
Disconnect the fuel pump control ECU connector.
Enter the following menus.
- Powertrain > Engine > Active Test
-
Tester Display Fuel Pump Single Phase Energization - 50004 372 49
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 O67-2 (FPU) - Body ground U Phase 4.4 to 8.4 V* O67-3 (FPV) - Body ground 8 to 15.5 V O67-4 (FPW) - Body ground 8 to 15.5 V O67-3 (FPV) - Body ground V Phase 4.4 to 8.4 V* O67-2 (FPU) - Body ground 8 to 15.5 V O67-4 (FPW) - Body ground 8 to 15.5 V O67-4 (FPW) - Body ground W Phase 4.4 to 8.4 V* O67-2 (FPU) - Body ground 8 to 15.5 V O67-3 (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 auxiliary battery voltage is between 11 and 14 V (not depleted).
- Result:
Proceed to OK NG
OK
NG
Disconnect the fuel pump control ECU connector.
Disconnect the fuel pump (for low pressure side) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition O67-2 (FPU) or O45-3 (BLPU) - Body ground and other terminals Always 10 kΩ or higher O67-3 (FPV) or O45-4 (BLPV) - Body ground and other terminals Always 10 kΩ or higher O67-4 (FPW) or O45-2 (BLPW) - Body ground and other terminals Always 10 kΩ or higher
- HINT:
-
Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).
- Result:
Proceed to OK NG
OK
NG