MerCruiser 305 CID (5.0L) Service Manual page 664

SERVICE MANUAL NUMBER 24
Chart A-6 (2 of 2): EFI System/Ignition Relay Check
Step
1.
2.
3.
4.
5.
6.
Index
90-861327--1 OCTOBER 1999
Was the "On-Board Diagnostic" (OBD) System Check
Performed?
a. Ignition OFF.
b. Remove EFI system relay connector.
c. Ignition ON.
d. With test light still connected to ground, probe relay har-
ness connector terminals "86" and "30."
Does Test Light Illuminate On Both Terminals?
Using test light connected to battery positive (B+), probe
relay harness connector terminal "85."
Does Test Light Illuminate?
Check relay connector for poor contact or corrosion. If OK,
replace faulty EFI system relay.
Locate and repair open or short to ground in circuit that did
not light (CKT 2 and/or CKT 3).
Locate and repair open ground CKT 150.
Action
DIAGNOSTICS
Yes No
PROCEED TO
Step 2. OBD
Step 3. Step 5.
Step 4. Step 6.
Verify
–
Repair
Page 5G-37