Mercury MerCruiser MCM 454 Mag MPI Service Manual page 727

TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Code 33 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Scan)
STEP
7
8
9
10
11
12
13
Index
Page 5F-30
Downloaded from https://needmanual.com/
ACTION
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?
MAP sensor signal CKT 432 shorted to volt-
age, faulty ECM connections or faulty ECM.
Check for MAP sensor signal CKT 432 shorted
to ground. if OK, Replace MAP sensor.
CKT 416 open, faulty ECM connection, or
faulty ECM.
MAP sensor signal CKT 432 open or shorted
to ground, faulty connections at ECM, or faulty
ECM.
Faulty MAP sensor.
Open sensor ground circuit.
SERVICE MANUAL NUMBER 23
VALUE YES NO
PROCEED TO
– Step 12 Step 13
– –
– –
– –
– –
–
– –
90-861326--1 MARCH 1999
–
–
–
–
–
–