Mercury MerCruiser MCM 454 Mag MPI Service Manual page 769

TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Code 34 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Non-Scan)
Low Signal Voltage
STEP
4
5
6
7
Index
Page 5G-24
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ACTION
Locate and repair intermittent faulty connec-
tions. If OK, replace faulty MAP sensor. Is
action complete?
Locate and repair open or short to ground in
CKT 432. If a problem is found, repair as nec-
essary. Was a problem found?
Locate and repair open or short to ground in
CKT 416E. Also check CKT 416 to the TP sen-
sor for a short to ground. If a problem is found,
repair as necessary. Was a problem found?
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 7
Verify y
Repair
– Step 7
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90-861326--1 MARCH 1999
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