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