Service manual

90-898303

3-22

Injector Test

PROCEDURE

For these procedures, refer to engine setup illustrations 1 and 2 on the

following page.

NOTE: Test cables required for all standard 2.4/2.5L and 3.0L EFI models

with injectors mounted inside the induction manifold. Use cables 84–822560A

7 and 84–830043A 1 for injector test.

1) Disconnect the 4–pin injector harness plugs (a & b) at the manifold

assembly as shown. Connect the injector test harness adaptor 4–pin

rubber plug (c) to (a) at the manifold.

2) Connect the black alligator clip (x) to engine ground (starter motor body)

and connect the red alligator clip (d) to the positive red wire at the electric

fuel pump. The unused bullet connector (e & f) should be plugged together

when not in use to prevent exposed wire from touching ground. Newer

style fuel pumps may have a bullet connector for attaching to the pump

terminals and in that case, remove the bullet connection from the positive

terminal of the pump and connect the male terminal (e) to the harness

from the pump and slide the female bullet (f) connector back to the

positive terminal at the pump. Slide the unused alligator clip (d) back into

the red boot to prevent contact to engine ground.

3) Connect the 4–pin DDT connector (g) to the mating connector on the

injector test harness (h). The DB–25 connector (j) is plugged into the rear

of the DDT. The DDT should power up once the software cartridge is

inserted into the DDT. If the DDT does not power up, make certain that

you engine battery is properly charged and that ground and power clips

are correctly attached as indicated in Step 2.

4) The green/white pigtail lead (k) exiting the rear of the DB– 25 connector

can now be plugged into one of three female bullet terminals (m). Select

either a yellow, white or blue wire to test the selected injector pair.

Notes

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