Mercury MerCruiser MIE 7.4L MPI User Manual

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

Mercury MerCruiser MIE 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MIE 7.4L MPI
Category	Engine
Language	English