SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Code 34 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Scan) -
Low Signal Voltage
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Repair low or unsteady vacuum problem. Is
action complete?
6
7
–
–
–
Trouble code is intermittent. Locate and repair
intermittent faulty connections. Refer to “Diag-
nostic Aids”.
–
Locate and repair open or short to ground in
CKT 416E. If a problem is found, repair as
necessary. Was a problem found?
8
9
–
–
Step 11
Verify
Repair
Locate and repair open or short to ground in
CKT 432. If a problem is found, repair as nec-
essary. Was a problem found?
Step 11
Check for plugged or leaking sensor vacuum
fitting. If OK, replace faulty MAP sensor. Is
action complete?
10
11
–
–
–
–
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
90-861326--1
MARCH 1999
Page 5G-57
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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