Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID

SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Code 25 (2 of 2): Engine Coolant Temperature (IAT) Sensor Circuit
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
2.
Step 2.
OBD
Are you using a Scan Tool?
Step 3.     Step 7.
Ignition ON.
3.
Does the scan tool display a temperature greater
than 266°F (130°C)?
Step 4.     Step 5.
a.   Ignition OFF.
b.   Disconnect IAT harness connector.
c.   Ignition ON, engine OFF.
4.
Does scan tool display a temperature below -22°F
Step 8.     Step 6.
(-30
°C)?
Trouble code 25 is intermittent. Locate and repair inter-
mittent faulty connections. Refer to “Diagnostic Aids.”
5.
6.
Verify
Repair
Locate and repair short to ground in CKT 472. If a  prob-
lem is found, repair as necessary.
Step 10.
Was a problem found?
a.   Ignition OFF.
b.   Disconnect IAT sensor harness terminals.
c.   Ignition ON, engine OFF.
7.
8.
d.   Connect DVOM across the sensor harness terminals.
Is voltage above 4 volts?
Step 8.     Step 9.
Locate and repair intermittent faulty connections or re-
place faulty IAT sensor.
Verify
Repair
9.
Locate and repair short to ground in CKT 472.
Repair faulty ECM connections.
Step 10.
10.
Index
90-861327--1
OCTOBER 1999
Page 5G-67
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID SKU UPC Model
Fernando Woll on Dec 09, 2014. Boat Engine

Great performance engine.
Class 1


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