Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23

TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 14 (3 of 3): Engine Coolant Temperature (ECT) Sensor Circuit
(Non-Scan) Low Temperature Indicated
ENGINE COOLANT TEMPERATURE SENSOR CHART
ECT Sensor
Temperature - to - Resistance Values (Approximate)
°
F
°C
OHMS
210
160
100
70
40
20
100
70
38
20
4
-7
-18
-40
185
450
1,800
3,400
7,500
13,500
25,000
100,700
0
-40
Code 15 (1 of 3): Engine Coolant Temperature (ECT) Sensor Circuit
(Non-Scan) High Temperature Indicated
a
c
d
b
a  - Engine Coolant Temperature (ECT) Sensor
b  - To Map Sensor
c  - Engine Coolant Temperature (ECT)
d  - Sensor Ground
CIRCUIT DESCRIPTION:
The Engine  Coolant Temperature  (ECT) sensor uses  a thermistor  to control  the signal
voltage to the ECM. The ECM applies 5 volts on CKT 410 to the sensor. When the engine
coolant is cold, the sensor (thermistor) resistance is high. As the engine coolant warms up,
the sensor resistance becomes less. see engine coolant temperature sensor chart  under
“Diagnostic Aids.” At normal operating temperature 160°F-180°F (71°C-82°C), the voltage
will measure about 1.5-2.0 volts.
Page 5G-6
90-861326--1   MARCH 1999
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 SKU UPC Model
Matt on Apr 08, 2015.

Just need the manual. Wrote review. Can't technically review what I haven't seen yet...


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