SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
Chart A-5 (2 of 3): Fuel System Electrical Test
Step
Action
Value(s)
Yes
No
Was The “On-Board Diagnostic”
1
(OBD)
Performed?
System
Check
–
Go to OBD
Go to Step 2 System Check
1.
2.
3.
4.
Ignition “OFF”.
Remove fuel pump relay.
Ignition “ON”.
Using test light connected to
ground, probe fuel pump
relay harness connector ter-
minal “30.”
2
3
4
–
–
–
Does Test Light Illuminate
Brightly?
Go to Step 3
Go to Step 7
1.
2.
Ignition “OFF”.
Using a fused jumper wire,
connect terminals “30” and
“87” of the fuel pump relay
connector together.
3.
Ignition “ON.”
Does Fuel Pump Run?
Go to Step 4
Go to Step 12
1.
2.
Ignition “OFF”.
Disconnect
wire.
fused
jumper
3.
Using a test light connected
tobatterypositive(B+),probe
terminal “86” of the fuel pump
relay connector.
Does The Test Light Illuminate
Brightly?
Go to Step 5
Go to Step 14
1.
Using a test fight connected
to ground, probe terminal
“85”
of the fuel pump relay
connector.
Ignition “ON”.
5
–
2.
Does Test Light Illuminate
Brightly For 2 Seconds And
Then Go Off?
Go to Step 6
Go to Step 6
Locate and repair faulty ECM
connection at “J2-9” or repair
open in CKT 465.
Go to OBD
System
Check
6
7
8
–
–
Was A Problem Found?
Go to Step 15
Go to Step 11
Check fuel pump relay fuse.
Is Fuse Ok?
Go to Step
10
Replace fuel pump relay and
retest.
34-38
(234-262
kPa)
psi
Go to OBD
System
Check
Is
Fuel
Pressure
Within
Specified Values?
Go to Step 9
Index
90-861326--1
MARCH 1999
Page 5E-79
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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