Mercury MerCruiser MCM 454 Mag MPI Service Manual page 766

SERVICE MANUAL NUMBER 23
Code 33 (2 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Non-Scan)
High Signal Voltage (Continued)
Index
90-861326--1 MARCH 1999
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Repair low or unsteady vacuum problem. Is
5
action complete?
Check for plugged or leaking sensor vacuum
6
fitting. If OK replace faulty MAP sensor. Is
action complete?
Locate and repair short to voltage in CKT 432.
7
If a problem is found, repair as necessary. Was
a problem found?
Locate and repair open in CKT 814. If a prob-
8 lem is found, repair as necessary. Was a prob-
lem found?
Repair faulty ECM connectors or replace faulty
9
ECM. Is action complete?
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Verify
–
Repair
Verify
–
Repair
–
Verify
–
Repair
–
Page 5G-21
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–
Step 9
Step 9
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