Mercury MerCruiser MCM 454 Mag MPI Service Manual page 799

TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Code 33 (2 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Scan)
High Signal Voltage
STEP
6
7
8
9
10
11
Index
Page 5G-54
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ACTION
Repair low or unsteady vacuum problem. Is
action complete?
Trouble code is intermittent. Locate and repair
intermittent faulty connections. Refer to "Diag-
nostic Aids".
Locate and repair short to voltage in CKT 432.
If a problem is found, repair as necessary. Was
a problem found?
Locate and repair open in CKT 814. If a prob-
lem is found, repair as necessary. Was a prob-
lem found?
Check for plugged or leaking sensor vacuum
fitting. If OK, replace faulty MAP sensor. Is
action complete?
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
SERVICE MANUAL NUMBER 23
VALUE YES NO
PROCEED TO
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– Step 11
Verify y
Repair
– Step 11
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90-861326--1 MARCH 1999
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