Fuel Injector 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.
•For identification of each cylinder, refer to Statement on Cleanliness and Care:K14C.
•For identification of each cylinder, refer to Statement on Cleanliness and Care:K14C.
Circuit Diagram
| [A]: | ECM connector (View: [a]) | C2: | Fuel injector No.3 drive circuit (low side) | 4. | Fuel injector No.4 |
| A1: | Fuel injector No.1 drive circuit (high side) | D1: | Fuel injector No.4 drive circuit (high side) | 5. | To IG1 relay |
| A2: | Fuel injector No.1 drive circuit (low side) | D2: | Fuel injector No.4 drive circuit (low side) | 6. | “IG COIL” fuse |
| B1: | Fuel injector No.2 drive circuit (high side) | 1. | Fuel injector No.1 | 7. | ECM |
| B2: | Fuel injector No.2 drive circuit (low side) | 2. | Fuel injector No.2 | ||
| C1: | Fuel injector No.3 drive circuit (high side) | 3. | Fuel injector No.3 |
Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Fuel injector drive circuit (high side) and (low side) circuit check
1)Remove intake manifold.
2)When ignition is “OFF”, disconnect “C01” and “E01” connectors of ECM and all fuel injector connectors.
3)Check for proper terminal connection to “C01” and “E01” connectors and all fuel injector connectors.
4)If connections are OK, check the following points.
•Resistance of “A1”, “A2”, “B1”, “B2”, “C1”, “C2”, “D1”, and “D2”: less than 1 Ω
•Resistance between each of “A1”, “A2”, “B1”, “B2”, “C1”, “C2”, “D1”, and “D2” circuits and ground: infinity •Resistance between each of “A1” circuit terminal and “A2” circuit terminal at fuel injector connector: infinity •Resistance between each of “B1” circuit terminal and “B2” circuit terminal at fuel injector connector: infinity •Resistance between each of “C1” circuit terminal and “C2” circuit terminal at fuel injector connector: infinity •Resistance between each of “D1” circuit terminal and “D2” circuit terminal at fuel injector connector: infinity •Voltage of “A1”, “A2”, “B1”, “B2”, “C1”, “C2”, “D1”, and “D2”: 0 to 1 V (When ignition is “ON”) Is check result OK?
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Go to Step 2.
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Repair or replace defective wire harness.
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| 2 |
Fuel injector check
1)Check fuel injector.
Is check result OK?
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End.
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Replace fuel injector.
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