High Pressure Fuel Pump and Its Circuit Check
Precautions: Precautions for Fuel System Service · General safety (00)
NOTE:
This procedure is to troubleshoot only open, short to ground circuit and short to power supply circuit of fuel injector circuit. If it is necessary to troubleshoot for injector operation, perform High-Pressure Fuel Supply Circuit Check:K14C.
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A2: | High pressure fuel pump drive circuit | 2. | ECM |
| A1: | High pressure fuel pump power supply circuit | 1. | High pressure fuel pump |
Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
High pressure fuel pump power supply circuit and drive circuit check
1)Remove engine cover.
2)Remove high pressure fuel pump cover.
3)When ignition is “OFF”, disconnect “C01” and “E01” connectors of ECM and high pressure fuel pump connector.
4)Check for proper terminal connection to “C01” and “E01” connectors and high pressure fuel pump connector.
5)If connections are OK, check the following points.
•Resistance of “A1” and “A2” circuits: less than 1 Ω
•Resistance between each of “A1” and “A2” circuits and ground: infinity •Resistance between “A1” circuit terminal and “A2” circuit terminal at high pressure fuel pump connector: infinity •Voltage of “A1” and “A2” circuits: 0 to 1 V (When ignition is “ON”) Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
High pressure fuel pump check
1)Check high pressure fuel pump.
•Resistance.
•Wear or damage. Is check result OK?
|
End.
|
Replace high pressure fuel pump.
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