Mercury MerCruiser MCM 502 Mag MPI User Manual

TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-49
Code 23 (2 of 3): Intake Air Temperature (IAT) Sensor Circuit (Scan) - Low
Temperature Indicated
STEP ACTION VALUE YES NO
PROCEED TO
4
Trouble code 23 is intermittent. Locate and re-
pair intermittent faulty connections.
– –
5
Locate and repair open in CKT 472 or CKT
813. If a problem is found, repair as necessary.
Was a problem found?
–
Verify
Repair
Step 7
6 Repair faulty IAT sensor. Is action complete? – –
7
Repair faulty ECM connections or replace
faulty ECM.
Is action complete?
– –
INTAKE AIR TEMPERATURE SENSOR CHART
IAT 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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Index

Mercury MerCruiser MCM 502 Mag MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 502 Mag MPI
Category	Engine
Language	English