Service manual

90-898303 2-19
1987 - 1995 2.4L & 2.5L - Fuel Pump Test
VOLTAGE TEST CHART
Engine Mode BLACK Meter Lead to
Engine Ground; RED
Meter Lead to:
Approximate Voltage
Reading
If Approximate
Voltage is not
obtained, this
indicates:
1. All models (+) terminal of fuel
pump
12 – 13.5 volts If reading is below 12
volts, the battery is bad,
discharged or has bad
connection(s).
2. Ignition key in “OFF”
position.
(– ) terminal of fuel
pump.
Same reading should
be obtained as reading
in check No. 1 (above)
If reading is lower than
in check 1, the fuel
pump is bad.
3. Ignition key in “ON”
position and engine
NOT running.
(– ) terminal of fuel
pump.
2 volts or less (voltage
should rise to 12 – 13.5
volts after
approximately 30
seconds.
Bad ECM or bad fuel
pump.*
4. Engine being
cranked.
(– ) terminal of fuel
pump.
2 volts or less. Bad ECM or bad fuel
pump.*
5. Engine running
below approximately
2000 RPM.
(– ) terminal of fuel
pump.
2 volts or less (for
approximately 30
seconds and then
switch to approximately
5 volts.
Bad ECM or bad fuel
pump.*
6. Engine running
above approximately
2000 RPM.
(– ) terminal of fuel
pump.
2 volts or less Bad ECM or bad fuel
pump.*
* Check for proper electrical operation of electric fuel pump
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