- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000028PZ5 |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [11/2022 - ] |
| Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P12D501; Fuel Pump Control General Electrical Failure; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 - ] | ||
|
DTC |
P12D501 |
Fuel Pump Control General Electrical Failure |
DESCRIPTION
Refer to DTC P062712.
Click here
![2023 MY Corolla Corolla Hatchback [11/2022 - 03/2023]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P062712; Fuel Pump "A" Control Circuit Short to Battery+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
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: except Mexico Models, 1 trip detection logic: for Mexico Models). |
|
|
DTC stored |
|
Related Data List
|
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
|
Related DTCs |
P12D5: Fuel pump circuit short |
|
Required Sensors/Components (Main) |
Fuel pump control ECU |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
3 seconds |
|
MIL Operation |
2 driving cycles: except Mexico Models Immediate: for Mexico Models |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
|
All of the following conditions are met |
- |
|
Output duty cycle |
3 to 65% |
|
Battery voltage |
10.5 V or higher |
|
Ignition switch |
ON |
|
Starter |
Off |
TYPICAL MALFUNCTION THRESHOLDS
|
Fuel pump circuit short error from fuel pump control module |
Received |
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 here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream 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.
- Start the engine and wait 10 seconds or more [A].
- Turn the Techstream on.
- 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.
Techstream Display
Description
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.
WIRING DIAGRAM
Refer to DTC P062712.
Click here
CAUTION / NOTICE / HINT
HINT:
Read Freeze Frame Data using the Techstream. 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 |
|
*a |
Component without harness connected (Fuel Pump Control ECU) |
- |
- |
(a) Remove the fuel pump control ECU.
-
for Hatchback: Click here
-
for Sedan: Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O180-2 (FPU) - O172-3 (GND) |
Always |
2 kΩ or higher |
|
O180-3 (FPV) - O172-3 (GND) |
Always |
2 kΩ or higher |
|
O180-4 (FPW) - O172-3 (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.
| NG |
|
REPLACE FUEL PUMP CONTROL ECU
|
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP SINGLE PHASE ENERGIZATION) |
|
*a |
Component without harness connected (Fuel Pump Control ECU) |
(a) Disconnect the O180 fuel pump control ECU connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream 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 |
(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 |
Techstream Operation |
Specified Condition |
|---|---|---|
|
O182-2 (FPU) - Body ground |
U Phase |
4.4 to 8.4 V* |
|
O182-3 (FPV) - Body ground |
8 to 15.5 V |
|
|
O182-4 (FPW) - Body ground |
8 to 15.5 V |
|
|
O182-3 (FPV) - Body ground |
V Phase |
4.4 to 8.4 V* |
|
O182-2 (FPU) - Body ground |
8 to 15.5 V |
|
|
O182-4 (FPW) - Body ground |
8 to 15.5 V |
|
|
O182-4 (FPW) - Body ground |
W Phase |
4.4 to 8.4 V* |
|
O182-2 (FPU) - Body ground |
8 to 15.5 V |
|
|
O182-3 (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).
| NG |
|
REPLACE FUEL PUMP CONTROL ECU
|
|
|
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 |
|---|---|---|
|
O180-2 (FPU) or O45-3 (BLPU) - Other terminals |
Always |
10 kΩ or higher |
|
O180-3 (FPV) or O45-4 (BLPV) - Other terminals |
Always |
10 kΩ or higher |
|
O180-4 (FPW) or O45-2 (BLPW) - Other terminals |
Always |
10 kΩ or higher |
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).
Click here
| OK |
|
REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) w/ Canister Pump Module (for Double Wishbone Type Suspension): Click here
w/o Canister Pump Module (for Double Wishbone Type Suspension): Click here
w/ Canister Pump Module (for Torsion Beam Type Suspension): Click here
w/o Canister Pump Module (for Torsion Beam Type Suspension): Click here
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|