FUEL INJECTOR INSPECTION[ZJ, ZY, Z6]

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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.

Without throttle valve actuator

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With throttle valve actuator

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•  If within the specification, perform the “Circuit Open/Short Inspection”.
•  If not within the specification, replace the fuel injector.
Fuel injector resistance
Approx. 13.8 ohms [20 °C {68 °F}] (without throttle valve actuator)
Approx. 12 ohms [20 °C {68 °F}] (with throttle valve actuator)


Circuit Open/Short Inspection (Without Throttle Valve Actuator)

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[ZJ, ZY, Z6].)

2.  Inspect the following wiring harnesses for an open or short circuit (continuity check).

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Open circuit
•  If there is no continuity, the circuit is open. Repair or replace the harness.
―  Fuel injector No.1 terminal A and PCM terminal 2E
―  Fuel injector No.2 terminal A and PCM terminal 2F
―  Fuel injector No.3 terminal A and PCM terminal 2G
―  Fuel injector No.4 terminal A and PCM terminal 2L
―  Fuel injector No.1 terminal B and PCM terminal 2B
―  Fuel injector No.2 terminal B and PCM terminal 2C
―  Fuel injector No.3 terminal B and PCM terminal 2D
―  Fuel injector No.4 terminal B and PCM terminal 2H
Short circuit
•  If there is continuity, the circuit is short. Repair or replace the 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


Circuit Open/Short Inspection (With Throttle Valve Actuator)

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Open circuit
•  If there is no continuity, the circuit is open. Repair or replace the harness.
―  Fuel injector No.1 terminal A and PCM terminal 2E
―  Fuel injector No.2 terminal A and PCM terminal 2F
―  Fuel injector No.3 terminal A and PCM terminal 2G
―  Fuel injector No.4 terminal A and PCM terminal 2L
―  Fuel injector No.1 terminal B and PCM terminal 2A
―  Fuel injector No.2 terminal B and PCM terminal 2B
―  Fuel injector No.3 terminal B and PCM terminal 2C
―  Fuel injector No.4 terminal B and PCM terminal 2H
Short circuit
•  If there is continuity, the circuit is short. Repair or replace the 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. (See BEFORE SERVICE PRECAUTION[ZJ, ZY, Z6].)

2.  Disconnect the negative battery cable.

3.  Remove the fuel injector and fuel distributor as a single unit. (See FUEL INJECTOR REMOVAL/INSTALLATION[ZJ, ZY, Z6].)

4.  Fix the fuel injector to the fuel distributor with a wire or the equivalent.

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5.  Connect the fuel hose.

6.  Connect the negative battery cable.

7.  Connect the M-MDS to the DLC-2.

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8.  Turn the ignition switch to the ON position.

9.  Using the simulation function “FP”, start the fuel pump.

10.  Tilt the fuel injector at an angle of 60° to inspect for leakage.

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•  If not within the specification, replace the fuel injector.
Fuel injector leakage amount
1 drop or less/2 min

11.  Turn the ignition switch to the LOCK position and stop the fuel pump.

12.  Remove the wire or the equivalent securing the fuel injector.

13.  Install the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION[ZJ, ZY, Z6].)

14.  Inspect all related parts by performing “AFTER SERVICE PRECAUTION”. (See AFTER SERVICE PRECAUTION[ZJ, ZY, Z6].)


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. (See BEFORE SERVICE PRECAUTION[ZJ, ZY, Z6].)

2.  Disconnect the negative battery cable.

3.  Remove the fuel injector and fuel distributor as a single unit. (See FUEL INJECTOR REMOVAL/INSTALLATION[ZJ, ZY, Z6].)

4.  Fix the fuel injector to the fuel distributor with a wire or the equivalent.

5.  Connect the SST to the corresponding fuel injector and battery.

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6.  Connect the negative battery cable.

7.  Connect the M-MDS to the DLC-2.

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8.  Turn the ignition switch to the ON position.

9.  Using the simulation function “FP”, start the fuel pump.

10.  Measure the fuel injection volume.

•  If not within the specification, replace the fuel injector.
Fuel injector injection volume
64—84 ml {64—84 cc, 3.9—5.1 cu in}/15 s (without throttle valve actuator)
Approx. 235 ml {235 cc, 14.3 cu in}/1 min (with throttle valve actuator)

11.  Turn the ignition switch to the LOCK position and stop the fuel pump.

12.  Remove the wire or the equivalent securing the fuel injector.

13.  Install the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION[ZJ, ZY, Z6].)

14.  Inspect all related parts by performing “AFTER SERVICE PRECAUTION”. (See AFTER SERVICE PRECAUTION[ZJ, ZY, Z6].)


Atomization Inspection

1.  Inspect the atomization status.

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•  If not normal, replace the fuel injector.