SERVICE MANUAL NUMBER 24
FUEL INJECTION SYSTEM TROUBLESHOOTING
Hard Start Symptom
Step
Action
Yes
No
PROCEED TO
Definition: Engine cranks OK, but does not start for a long time. Does eventually
run, or may start but immediately dies.
Was the “On-Board Diagnostic” (OBD)
System Check performed?
1
Step 2
Step 3
Step 4
OBD
Does the driver know the correct starting
procedure?
2
3
System normal
Visual/ Physical
Check
Was visual/physical check performed?
1.
Check for proper operation of fuel pump
relay circuit.
4
5
6
• Refer to Table A-5 in “General System
Diagnostics” section.
Was a problem found?
OBD
OBD
Step 5
Step 6
1.
Check for contaminated fuel.
2. Check water separating fuel filter.
Was a problem found?
1.
•
Check for proper fuel pressure.
Refer to Table A-4 in “General System
Diagnostics” section.
Was fuel pressure 30 psi for EFI or 3–7 psi
for carbureted engines?
OBD
Step 7
1.
•
Check for proper ignition voltage output.
Refer to Table A-7 in “General System
Diagnostics” section.
7
8
Was a problem found?
OBD
Step 8
Step 9
Is a scan tool being used?
Step 10
1.
2.
Check for a ECT sensor shifted in value.
With engine completely cool, measure the
resistance of the ECT sensor.
3.
Refer to the Engine Coolant Temperature
Sensor Temperature -vs- Resistance value
table on the facing page of DTC 14 in the
9
“Trouble
Code Diagnostics” section.
Compare the approximate temperature of
the ECT sensor to an accurate reading of
ambient air temperature.
Are the readings within the specified
value?
Step 14
Step 11
Step 13
1.
Check ECT sensor for being shifted in
value.
2.
With the engine completely cool, compare
the ECT sensor temperature with an accu-
rate reading of ambient air temperature.
10
Are the temperatures within 10° F (-12° C) of
each other?
Step 13
Index
90-861327--1
OCTOBER 1999
Page 5F-5
| 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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