Fuel Injector on-Vehicle Inspection
On-vehicle Inspection1. Warm up the engine and let it idle.
2. Listen for operation sound of each fuel injector with a screwdriver or a soundscope. If no sound is heard, carry out the "Fuel Injector Resistance Inspection".
NOTE: The best way to judge the performance of a fuel injector is to compare its sound with the sound of other fuel injectors.
Resistance Inspection
NOTE: Perform the following test only when directed.
1. Disconnect the fuel injector connectors.
2. Measure the resistance of the fuel injector using an ohmmeter.
- If as specified but On-vehicle Inspection is failed, carry out the "Circuit Open/Short Inspection".
- If not as specified, replace the fuel injector.
Resistance: 12 - 13 Ohms [20 °C {68 °F}]
Circuit Open/Short Inspection
Open circuit
- GND circuit (No.1 cylinder fuel injector connector terminal B and PCM connector terminal 2A)
- GND circuit (No.2 cylinder fuel injector connector terminal B and PCM connector terminal 2D)
- GND circuit (No.3 cylinder fuel injector connector terminal B and PCM connector terminal 2G)
- GND circuit (No.4 cylinder fuel injector connector terminal B and PCM connector terminal 2J)
- Power circuit (No.1 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
- Power circuit (No.2 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
- Power circuit (No.3 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
- Power circuit (No.4 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
Short circuit
- No.1 cylinder fuel injector connector terminal B and PCM connector terminal 2A to GND
- No.2 cylinder fuel injector connector terminal B and PCM connector terminal 2D to GND
- No.3 cylinder fuel injector connector terminal B and PCM connector terminal 2G to GND
- No.4 cylinder fuel injector connector terminal B and PCM connector terminal 2J to GND
Fuel Leakage and Volume Test
WARNING: Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Always carry out the following procedure with the engine stopped.
1. Complete the "BEFORE REPAIR PROCEDURE".
2. Disconnect the negative battery cable.
3. Remove the dynamic chamber.
4. Remove the fuel injectors together with the fuel distributor.
5. Fasten the fuel injectors firmly to the fuel distributor with wire and connect the fuel pipe connector.
6. Connect the negative battery cable.
CAUTION: Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.
7. Connect DLC terminals F/P and body GND using a jumper wire.
8. Turn the ignition switch to ON to operate the FP.
9. Tilt the fuel injectors approx. 60 degrees and verify that fuel leaks from the fuel injector nozzles is within specification.
- If not as specified, replace the fuel injector
Fuel leakage
Less than 1 drop/2 min
10. Turn the ignition switch to the LOCK position.
11. Connect the SST as shown in the figure.
12. Turn the ignition switch to ON to operate the FP.
13. Measure the injection volume of each fuel injector using a graduated container.
- If not as specified, replace the fuel injector.
Injection volume
68 - 88 ml {68 - 88 cc, 2.3 - 2.9 fl oz}/15 s.
14. Turn the ignition switch to the LOCK position and disconnect the jumper wire.
15. Install the dynamic chamber.
16. Complete the "AFTER REPAIR PROCEDURE".
Using a fuel injector tester
1. Remove the fuel injectors.
2. Connect the fuel injector to a fuel injector.
3. Measure the injection volume of each fuel injector. If not as specified, replace the fuel injector.
Injection volume
68 - 88 ml {68 - 88 cc, 2.3 - 2.9 fl oz}/15 s.
4. Complete the "AFTER REPAIR PROCEDURE".