Service manual

90-898303
3-7
INDUCTION MANIFOLD
The induction manifold is a common plenum chamber for accurate pressure
measurement. It contains 4 throttle shutters (*see below) on 2 throttle shafts.
The shutter opening (idle air opening) can be adjusted during EFI set-up
procedure. The manifold contains the fuel rail, injectors, throttle position
sensor and air temperature sensor. A fuel rail pressure port is located on the
fuel pressure regulator.
• 3.0L 1995– 1999 225HP 2 shutters
• 3.0L 2000– 2001 225HP 4 shutters
• 3.0L 1996– 2001 250HP 4 shutters
ECM Injector Driver Test
To verify that the ECM is operating the injector pairs, connect test harness
(91-833169) between manifold connector and engine harness. Start engine.
Use DVA meter (91-99750). Set DVA to 200 scale. Connect BLACK meter
lead to engine ground and RED test lead to each BLUE, WHITE or YELLOW
female bullet connector.
Normal voltage for a 3.0L engines will be 60 to 100 volts. Voltage will vary
with RPM.
Notes
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