Mercury MerCruiser MCM 454 Mag MPI Service Manual page 703

TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Code 14 (3 of 3): Engine Coolant Temperature (ECT) Sensor Circuit
(Non-Scan)
STEP
5
6
7 7
8
9
10
Index
Page 5F-6
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ACTION
CKT 410 open, faulty connection at ECM, or
faulty ECM.
Intermittent connections, faulty ECT sensor
(refer to chart below for sensor values).
Disconnect J-1 connector.
Is test light on?
CKT 410 shorted to ground.
CKT 410 shorted to sensor ground or faulty
ground.
Open sensor ground CKT 814, faulty connec-
tion at ECM, or faulty ECM.
Temperature - to - Resistance Values (Approximate)
F
210
160
100
70
40
20
0
-40
VALUE
ECT Sensor
C
100
70
38
20
4
-7
-18
-40
SERVICE MANUAL NUMBER 23
YES NO
PROCEED TO
– –
– –
Ste 8 Step 8 Step 9 Ste 9
– –
– –
– –
OHMS
185
450
1,800
3,400
7,500
13,500
25,000
100,700
90-861326--1 MARCH 1999