Problem 2: The next
strange condition
on these vehicles is a
complaint of no line
rise when the wheels
are turning.
A quick test to diagnose whether
a shift shuttle is being caused by this
sensor would be to disconnect it. The
vehicle will be difficult to start, but if
Figure 3
disconnecting the sensor eliminates the
symptom during the road test, replace
the sensor. The optical/fuel temperature
sensor comes with the injector pump. So
when you purchase the sensor you get
the injector pump for free!
Problem 2: The next strange condi-
tion on these vehicles is a complaint of
no line rise when the wheels are turn-
ing. During a stall test, line rise appears
perfect. But as soon as the wheels begin
to turn about 5 to 7 MPH, line pressure
never rises above 60 PSI. This problem
is caused by a bad fuel solenoid driver
module located on the side of the injec-
tor pump (figure 4).
The PCM receives signals from
the accelerator pedal position (APP)
sensor, temperature sensor, pump cam
sensor (optical/fuel temperature) and
crankshaft position sensor. The PCM
Figure 4
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GEARS January/February 2010 27
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