90-824052R3 JUNE 2002 FUEL SYSTEMS - 3D-33
3. Perform voltage tests “all (1-4) engine modes”
below.
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 in-
dicates:
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). If reading
is higher than 13.5 volts,
the battery is over-
charged
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
test 1, the ECM is bad or
there is an open circuit in
fuel pump.
3. Ignition key in “ON”
position and engine
NOT running.
(–) terminal of fuel pump. 1.5 volt 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. 1.5 volt or less. Bad ECM or bad fuel
pump.*
*Check for proper electrical operation of electric fuel
pump. (Step 4)
4. Disconnect BLACK/RED wire to negative
terminal on electric fuel pump. Connect a ground
jumper wire from negative pump terminal to a
good engine ground.
Results: Pump does not operate. Replace electric
fuel pump.
Pump operates. But, pressure reading does not
change when performing electric fuel pump
“pressure” test. Replace electric fuel pump.
Pump operates. Check BLACK/RED (–) lead and
harness for good continuity.
NOTE: BLACK/RED lead is connected to pin 2 of EFI
harness.
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