Mercury MerCruiser MCM 454 Mag MPI Service Manual page 794

SERVICE MANUAL NUMBER 23
Code 23 (2 of 3): Intake Air Temperature (IAT) Sensor Circuit (Scan) - Low
Temperature Indicated
INTAKE AIR TEMPERATURE SENSOR CHART
Index
90-861326--1 MARCH 1999
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STEP
Trouble code 23 is intermittent. Locate and re-
4
pair intermittent faulty connections.
Locate and repair open in CKT 472 or CKT
5
813. If a problem is found, repair as necessary.
Was a problem found?
Repair faulty IAT sensor. Is action complete?
6
Repair faulty ECM connections or replace
7
faulty ECM. Is action complete?
Temperature - to - Resistance Values (Approximate)
F
210
160
100
70
40
20
0
-40
ACTION
IAT Sensor
C
100
70
38
20
4
-7
-18
-40
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
VALUE YES
PROCEED TO
–
–
Verify
Repair
–
–
OHMS
185
450
1,800
3,400
7,500
13,500
25,000
100,700
Page 5G-49
NO
–
Step 7
–
–