3D-32 - FUEL SYSTEMS 90-824052R3 JUNE 2002
Electric Fuel Pump Voltage Test
CAUTION
When checking voltage at pump, DO NOT pry
boot covers off terminals with a metal object, as
each terminal is at 12 volts when engine is off.
Serious damage to electric fuel pump and/or
ECM box can result.
Purpose: If insufficient electrical power is available
at the pump, no or low fuel pressure will be
developed.
1. Set volt meter to read battery voltage and
connect black test lead to ground, positive test
lead to positive (+) post of fuel pump.
NOTE: Positive test lead can be pierced through boot
cover for testing. Refer to voltage test chart (page
3D-33) for voltage readings.
Positive Test Terminal
VOLTS
DC AMPS
OHMS
0
2
46
8
10
DCV
ACV
DVA
0
0
5
10
20
10
30
15
40
20
0
5
10
15
20
3040
60
100
200
55191
a
a - POSITIVE (+) Terminal
2. Set volt meter to read battery voltage and con-
nect BLACK test lead to ground, POSITIVE test
lead to NEGATIVE (–) post of fuel pump.
Negative Test Terminal
VOLTS
DC AMPS
OHMS
0
2
46
8
10
DCV
ACV
DVA
0
0
5
10
20
10
30
15
40
20
0
5
10
15
20
3040
60
100
200
55192
a
a - NEGATIVE (–) Terminal