Fuel Injector: Testing and Inspection

FUEL INJECTOR INSPECTION [MZI-3.7]

NOTE:
- Perform the following inspection only when directed.

Operation Test

1. Carry out the "Fuel Injector Operation Inspection". Engine Control System Operation Inspection

- If not as specified, perform the further inspection for the fuel injectors.

Resistance Inspection

1. Turn the ignition switch to LOCK position.

2. Disconnect the negative battery cable. Removal and Replacement

3. Remove the engine cover. Service and Repair

4. Remove the dynamic chamber. Service and Repair

5. Disconnect the fuel injector connectors.

6. Measure the resistance of the fuel injector.

- If not as specified, replace the fuel injector. Service and Repair

- If as specified but "Operation Test" is failed, carry out the "Circuit Open/Short Inspection". Inspect for open or short circuit.

Fuel injector resistance
- 11.3-12.7 ohms






Circuit Open/Short Inspection

1. Disconnect the PCM connector.

2. Inspect the following wiring harness for open or short (continuity check).
















Open circuit

- If there is no continuity, the circuit is open. Repair or replace the harness.

- No.1 cylinder fuel injector terminal A and PCM terminal 2BJ
- No.2 cylinder fuel injector terminal A and PCM terminal 2BM
- No.3 cylinder fuel injector terminal A and PCM terminal 2BF
- No.4 cylinder fuel injector terminal A and PCM terminal 2BH
- No.5 cylinder fuel injector terminal A and PCM terminal 2BB
- No.6 cylinder fuel injector terminal A and PCM terminal 2BD
- No.1 cylinder fuel injector terminal B and fuel pump relay terminal D
- No.2 cylinder fuel injector terminal B and fuel pump relay terminal D
- No.3 cylinder fuel injector terminal B and fuel pump relay terminal D
- No.4 cylinder fuel injector terminal B and fuel pump relay terminal D
- No.5 cylinder fuel injector terminal B and fuel pump relay terminal D
- No.6 cylinder fuel injector terminal B and fuel pump relay terminal D

Short circuit

- If there is continuity, the circuit is short. Repair or replace the harness.

- No.1 cylinder fuel injector terminal A and body ground
- No.2 cylinder fuel injector terminal A and body ground
- No.3 cylinder fuel injector terminal A and body ground
- No.4 cylinder fuel injector terminal A and body ground
- No.5 cylinder fuel injector terminal A and body ground
- No.6 cylinder fuel injector terminal A and body ground
- No.1 cylinder fuel injector terminal B and power supply
- No.2 cylinder fuel injector terminal B and power supply
- No.3 cylinder fuel injector terminal B and power supply
- No.4 cylinder fuel injector terminal B and power supply
- No.5 cylinder fuel injector terminal B and power supply
- No.6 cylinder fuel injector terminal B and power supply

Atomization

1. Inspect atomization pattern.






- If the atomization is faulty, replace the fuel injector. Service and Repair