DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Code 14 (2 of 3): Engine Coolant Temperature (ECT) 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 8.
a. Ignition ON.
Does scan tool display a coolant temperature value
greater than 266° F (130° C) or less than -22° F (-30°
C)?
3.
Step 4. Step 5.
Does scan tool display a coolant temperature value
greater than 266° F (130° C)?
4.
5.
Step 6. Step 7.
Code 14 is intermittent. If no additional codes were
stored, refer to “Diagnostic Aids.”
–
–
a. Ignition OFF.
b. Disconnect ECT sensor.
c. Ignition ON.
6.
7.
Does scan tool display coolant temperature below
Step 12. Step 14.
-22
° F (-30° C).
a. Ignition OFF.
b. Disconnect ECT sensor.
c. Jumper terminals “A” and “B” together.
d. Ignition ON.
Does scan tool display coolant temperature above
Step 12. Step 15.
266
° F(130° C).
NOTE: Following steps do not require a Scan Tool.
a. Ignition OFF.
b. Disconnect ECT sensor connector.
c. Ignition ON, engine OFF.
8.
9.
d. Connect DVOM across coolant sensor harness termi-
nals.
Is voltage above 4 volts?
Step 12. Step 9.
Step 16. Step 10.
a. Connect positive DVOM lead from harness terminal “B”
CKT 410 (5 volt reference).
b. Connect negative DVOM lead to a good ground (–) on
engine.
Is voltage above 4 volts?
Index
Page 5G-54
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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