SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Page 5F-30
90-861326--1 MARCH 1999
Code 33 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Scan)
STEP
ACTION
VALUE
YES
NO
PROCEED TO
7
1. Ignition OFF.
2. Connect DVOM between MAP sensor
harness terminal “A” and “C.”
3. Ignition ON.
Voltage should be greater than 4 volts. Is
it?
–
Step 12
Step 13
8
MAP sensor signal CKT 432 shorted to volt-
age, faulty ECM connections or faulty ECM.
–
–
–
9
Check for MAP sensor signal CKT 432 shorted
to ground. if OK, Replace MAP sensor.
–
–
–
10
CKT 416 open, faulty ECM connection, or
faulty ECM.
–
–
–
11
MAP sensor signal CKT 432 open or shorted
to ground, faulty connections at ECM, or faulty
ECM.
–
–
–
12
Faulty MAP sensor.
–
–
13
Open sensor ground circuit.
–
–
–
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