SFI SYSTEM > Fuel Pump Control Circuit |
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DESCRIPTION
When the engine is cranked, the start request signal output from the power management control ECU *1, or ignition or starter switch assembly*2 is input to the ECM, and the NE signal generated by the crank position sensor is also input to the NE+ terminal. Thus, the ECM interprets that the engine has been cranked, and turns transistor Tr1 in the ECM internal circuit on. Current flows to the C/OPN (Circuit Opening) relay by turning Tr1 on. Then, the fuel pump with filter assembly operates.While the NE signal is input to the ECM with the engine running, the ECM turns Tr1 on continuously.
- *1: w/ Smart Key System
- *2: w/o Smart Key System
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP / SPEED) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
Check whether the fuel pump with filter assembly operating sound occurs when performing the Active Test on the Techstream.
Result Result Proceed to Fuel pump with filter assembly operating sound does not occur A Fuel pump with filter assembly operating sound occurs B
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A | |
2.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
Remove the No. 1 integration relay from the No. 2 engine room relay block and No. 2 junction block assembly.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 2D-4 - A40-21 (FC) Always Below 1 Ω 2D-4 or A40-21 (FC) - Body ground Always 10 kΩ or higher
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OK | |
3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL PUMP WITH FILTER ASSEMBLY) |
Remove the No. 1 integration relay from the No. 2 engine room relay block and No. 2 junction block assembly.
Disconnect the fuel pump with filter assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 2D-8 - M22-4 (B) Always Below 1 Ω 2D-8 or M22-4 (B) - Body ground Always 10 kΩ or higher
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OK | |
4.CHECK HARNESS AND CONNECTOR (FUEL PUMP WITH FILTER ASSEMBLY - BODY GROUND) |
Disconnect the fuel pump with filter assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition M22-5 (E) - Body ground Always Below 1 Ω
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OK | |
5.INSPECT FUEL PUMP WITH FILTER ASSEMBLY |
Inspect the fuel pump with filter assembly (Click here).
- HINT:
- Perform "Inspection After Repair" after replacing the fuel pump with filter assembly (Click here).
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OK | |
6.INSPECT NO. 1 INTEGRATION RELAY (C/OPN RELAY) |
Inspect the No. 1 integration relay (C/OPN relay) (Click here).
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OK | ||
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