SERVICE MANUAL NUMBER 23TROUBLE 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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