Mercury MerCruiser MCM 454 Mag MPI Service Manual page 802

SERVICE MANUAL NUMBER 23
Code 34 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Scan) -
Low Signal Voltage
Index
90-861326--1 MARCH 1999
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STEP
Repair low or unsteady vacuum problem. Is
6
action complete?
Trouble code is intermittent. Locate and repair
7
intermittent faulty connections. Refer to "Diag-
nostic Aids".
Locate and repair open or short to ground in
8
CKT 416E. If a problem is found, repair as
necessary. Was a problem found?
Locate and repair open or short to ground in
9
CKT 432. If a problem is found, repair as nec-
essary. Was a problem found?
Check for plugged or leaking sensor vacuum
10
fitting. If OK, replace faulty MAP sensor. Is
action complete?
Repair faulty ECM connections or replace
11
faulty ECM. Is action complete?
ACTION
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
VALUE YES
PROCEED TO
–
–
–
Verify y
Repair
–
–
–
Page 5G-57
NO
–
–
Step 11
Step 11
–
–