FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
Hard Start Symptom (Continued)
Step
Action
Yes
No
PROCEED TO
1.
Using a scan tool, display ECT sensor tem-
perature and note value.
2.
3.
Check resistance of ECT sensor.
Go to Engine Coolant Temperature Sensor
Temperature -vs- Resistance value table
on the facing page of DTC 14 in the Diag-
nostics section.
11
Is resistance value of ECT sensor near the
resistance of the value noted?
Step 14
Step 12
1.
Locate and repair high resistance or poor
connection in the ECT signal circuit or the
ECT sensor ground.
12
Is action complete?
–
–
13
14
Replace the ECT sensor.
1.
Check for intermittent opens or shorts to
ground in the MAP sensor circuits.
Was a problem found?
Step 15
1.
Check for proper operation of the TP sen-
sor.
2.
Check or throttle linkage sticking, binding
or worn causing TP sensor voltage to be
higher than normal.
15
16
Is TP sensor operating improperly or is
voltage higher than normal?
Step 16
Step 17
1.
Check for proper operation of the IAC
valve. (Table A-8)
Was a problem found?
1.
•
Check or the following engine problems:
Low compression.
•
Leaking cylinder head gaskets.
17
• Worn or incorrect camshaft.
•
•
Proper valve timing/valve train problem.
Restricted exhaust system.
Was a problem found?
OBD
Step 18
1.
Review all diagnostic procedures within
this table.
2.
If all procedures have been completed and
no malfunctions have been found, review/
inspect the following:
18
•
•
•
Visual/physical inspection.
Scan tool data.
All electrical connections within a sus-
pected circuit and/or system.
Contact
MerCruiser
Customer
Service
OBD
Index
Page 5F-6
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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