Mercury MerCruiser MIE 7.4L MPI - Page 703

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