DESCRIPTION
Refer to DTC P062712.
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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). |
| Comes on | DTC stored | 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%, and short 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.
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 |
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% |
Auxiliary battery voltage | 10.5 V or higher |
Power switch | On (IG) |
TYPICAL MALFUNCTION THRESHOLDS
Fuel pump circuit short error from fuel pump control module | Received |
CONFIRMATION DRIVING PATTERN
HINT:
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HINT:
Techstream Display | Description |
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NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
Refer to DTC P062712.
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CAUTION / NOTICE / HINT
NOTICE:
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(Select Powertrain in Health Check and then check the time stamp data.)
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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 |
*1 | Fuel Pump Control ECU | - | - |
(a) Remove the fuel pump control ECU.
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
N18-2 (FPU) - N19-3 (GND) | Always | 2 kΩ or higher |
N18-3 (FPV) - N19-3 (GND) | Always | 2 kΩ or higher |
N18-4 (FPW) - N19-3 (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 |
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2. | PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP SINGLE PHASE ENERGIZATION) |
*1 | Fuel Pump Control ECU | - | - |
(a) Disconnect the N18 fuel pump control ECU connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(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 |
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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 |
---|---|---|
N18-2 (FPU) - Body ground | U Phase | 4.4 to 8.4 V* |
N18-3 (FPV) - Body ground | 8 to 15.5 V | |
N18-4 (FPW) - Body ground | 8 to 15.5 V | |
N18-2 (FPU) - Body ground | V Phase | 8 to 15.5 V |
N18-3 (FPV) - Body ground | 4.4 to 8.4 V* | |
N18-4 (FPW) - Body ground | 8 to 15.5 V | |
N18-2 (FPU) - Body ground | W Phase | 8 to 15.5 V |
N18-3 (FPV) - Body ground | 8 to 15.5 V | |
N18-4 (FPW) - Body ground | 4.4 to 8.4 V* |
HINT:
NG | REPLACE FUEL PUMP CONTROL ECU |
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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 |
---|---|---|
N18-2 (FPU) or N45-3 (BLPU) - Body ground and other terminals | Always | 10 kΩ or higher |
N18-3 (FPV) or N45-4 (BLPV) - Body ground and other terminals | Always | 10 kΩ or higher |
N18-4 (FPW) or N45-2 (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).
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OK | REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |