Fuel Pump Relay Operation Check
Precautions: General safety (00)
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | Fuel pump power supply circuit | 3. | Fuel pump |
| A1: | Fuel pump relay power supply circuit (coil side) | B2: | Fuel pump ground circuit | 4. | “F/P” fuse |
| A2: | Fuel pump relay power supply circuit (switch side) | 1. | ECM | ||
| A3: | Fuel pump relay drive circuit | 2. | Fuel pump relay |
Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Fuel pump operation check
1)Check fuel pump operation.
Is check result OK?
|
End.
|
Go to Step 2.
|
| 2 |
Fuel pump relay power supply circuit check
1)When ignition is “OFF”, remove fuel pump relay.
2)Check for proper terminal connection to fuel pump relay.
3)If connections are OK, check that voltage between each of “A1” and “A2” circuits and ground is battery voltage.
Is check result OK?
|
Go to Step 3.
|
Repair “A1” and/or “A2” circuit.
|
| 3 |
Fuel pump relay drive circuit check
1)When ignition is “OFF”, disconnect “E01” connector from ECM.
2)Check for proper terminal connection to “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A3” circuit: less than 1 Ω
•Resistance between “A3” circuit and ground: infinity •Resistance between “A3” circuit terminal and other terminal at fuel pump relay connector: infinity •Voltage of “A3” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 4.
|
Repair “A3” circuit.
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| 4 |
Fuel pump relay check
1)Check fuel pump relay.
Is check result OK?
|
Go to Step 5.
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Replace fuel pump relay.
|
| 5 |
Fuel pump relay drive signal check
1)When ignition is “OFF”, connect “E01” connector to ECM.
2)Check that voltage between “A3” circuit and ground is approx. 0 V about 20 sec. after setting ignition “ON”.
Is check result OK?
|
Go to Step 6.
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Replace ECM and recheck fuel pump operation.
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| 6 |
Fuel pump power supply circuit and ground circuit check
1)When ignition is “OFF”, install fuel pump relay.
2)Disconnect connector from fuel pump.
3)Check for proper connection to fuel pump.
4)If connection is OK, check that voltage between “B1” and “B2” circuits is battery voltage for about 20 sec. after setting ignition “ON”.
Is check result OK?
|
Replace fuel pump.
|
Go to Step 7.
|
| 7 |
Fuel pump ground circuit check
1)Check that voltage between “B1” circuit and ground is battery voltage for about 20 sec. after setting ignition “ON”.
Is check result OK?
|
Repair “B2” circuit.
|
Repair “B1” circuit.
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