DESCRIPTION
The fuel pump control ECU performs PWM (Pulse Width Modulation) control to control the fuel pump (for low pressure side) speed steplessly over a wide range.
The fuel pump control ECU controls the speed of the fuel pump (for low pressure side) by switching the current of FPU, FPV and FPW based on operation signals output from the ECM.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
---|---|---|---|---|---|
P062712 | Fuel Pump "A" Control Circuit Short to Battery | When the fuel pump control ECU operation duty ratio is 3 to 65%, the FPC terminal voltage is at a certain value or more for 3 seconds or more (1 trip detection logic). |
| - | SAE: P0629 |
DTC No. | Data List |
---|---|
P062712 | Fuel Pump Control Duty Ratio |
MONITOR DESCRIPTION
The ECM monitors the fuel pump control ECU operation signals.
When the output duty ratio of the operation signal from the ECM is 3 to 65% and the FPC terminal voltage is a certain value or more for 3 seconds or more, the ECM stores a DTC.
MONITOR STRATEGY
Required Sensors/Components | Fuel pump control ECU |
Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
HINT:
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
WIRING DIAGRAM
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 ECM (CHECK FOR SHORT) |
(a) Disconnect the fuel pump control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
O2-2 (FPC) - Body ground | Ignition switch ON | Below 1 V |
OK |
![]() | REPLACE FUEL PUMP CONTROL ECU |
|
2. | CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM) |
(a) Disconnect the fuel pump control ECU connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
O2-2(FPC) or A106-6(FPC) - Other terminals | Always | 10 kΩ or higher |
OK |
![]() | REPLACE ECM |
NG |
![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.