Fuel Injector: Testing and Inspection
FUEL INJECTOR INSPECTION [LF, L3]
Resistance Inspection
1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative battery cable.
3. Disconnect the fuel injector connector.
4. Inspect the resistance between fuel injector terminals A and B using a tester.
- If within the specification, perform the "Circuit Open/Short Inspection".
- If not within the specification, replace the fuel injector.
Fuel injector resistance
- California emission regulation applicable model: 13.1-14.5 ohms [20 °C {68 °F}]
- Except for California emission regulation applicable model: 11.4-12.6 ohms [20 °C {68 °F}]
Circuit Open/Short Inspection
1. Disconnect the PCM connector. Service and Repair
2. Inspect the following wiring harnesses for open or short circuit (continuity check).
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Fuel injector No.1 terminal A and PCM terminal 2BB
- Fuel injector No.2 terminal A and PCM terminal 2BC
- Fuel injector No.3 terminal A and PCM terminal 2BD
- Fuel injector No.4 terminal A and PCM terminal 2AZ
- Fuel injector No.1 terminal B and main relay terminal A
- Fuel injector No.2 terminal B and main relay terminal A
- Fuel injector No.3 terminal B and main relay terminal A
- Fuel injector No.4 terminal B and main relay terminal A
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Fuel injector No.1 terminal A and body ground
- Fuel injector No.2 terminal A and body ground
- Fuel injector No.3 terminal A and body ground
- Fuel injector No.4 terminal A and body ground
Leakage Inspection
WARNING:
- Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.
1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. Before Service Precaution
2. Disconnect the negative battery cable.
3. Remove the fuel injector and fuel distributor as a single unit. Service and Repair
4. Fix the fuel injector to the fuel distributor with a wire or the equivalent.
5. Connect the fuel hose.
6. Start the fuel pump using the following procedure:
Using M-MDS
1 Connect the M-MDS to the DLC-2.
2 Start the fuel pump using the "FP" simulation function.
Without using M-MDS
1 Remove the fuel pump relay.
CAUTION:
- Be careful to short the specified terminal as shorting the wrong terminal of the main fuse block may cause a malfunction.
2 Using a jumper wire, short fuel pump relay terminals C and D and connect the negative battery cable to start the fuel pump.
7. Tilt the fuel injector at an angle of 42° to inspect for leakage.
- If not within the specification, replace the fuel injector.
Standard
- Less than 1 drop/2 min
8. Stop the fuel pump using the following procedure:
Using M-MDS
1 Stop the fuel pump using the "FP" simulation function.
Without using M-MDS
1 Disconnect the negative battery cable to stop the fuel pump.
9. Disconnect the negative battery cable. (using M-MDS)
10. Remove the wire or equivalent securing the fuel injector.
11. Install the fuel injector. Service and Repair
12. Inspect all related parts by performing "AFTER SERVICE PRECAUTION". After Service Precaution
Injection Volume Inspection
WARNING:
- Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.
1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. Before Service Precaution
2. Disconnect the negative battery cable.
3. Remove the fuel injector. Service and Repair
4. Connect the fuel injector to the fuel injector tester.
5. Start the fuel pump using the following procedure:
Using M-MDS
1 Connect the M-MDS to the DLC-2.
2 Start the fuel pump using the "FP" simulation function.
Without using M-MDS
1 Remove the fuel pump relay.
CAUTION:
- Be careful to short the specified terminal as shorting the wrong terminal of the main fuse block may cause a malfunction.
2 Using a jumper wire, short fuel pump relay terminals C and D and connect the negative battery cable to start the fuel pump.
6. Measure the injection volume of each fuel injector.
- If not within the specification, replace the fuel injector.
Standard
- California emission regulation applicable model: 260-320 ml {260-320 cc, 15.9-19.5 cu in}/min
- Except for California emission regulation applicable mode: 195-245 ml {195-245 cc, 11.9-14.9 cu in}/min
7. Disconnect the negative battery cable.
8. Install the fuel injector. Service and Repair
9. Inspect all related parts by performing "AFTER SERVICE PRECAUTION". After Service Precaution
Atomization Inspection
1. Inspect the atomization status.
- If not normal, replace the fuel injector.