SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Code 33 (3 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit (Non-Scan)
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Is voltage reading over 4 volts?
–
Step 5
Step 8
5
1. Ignition OFF.
2.
Connect a test light to battery positive
(B+).
3.
Touch test light to harness terminal “B”
(MAP sensor signal).
Is test light on?
–
Step 6
Step 9
Step12
6
1. Disconnect ECM.
2.
Touch test light connected to battery pos-
–
–
Step 11
itive (B+) to harness terminal “B.” (See Note)
Connect DVOM from MAP sensor harness ter-
minal “C” to a good ground on engine.
7
8
Step 14 Step 13
Is voltage reading over 4 volts?
Connect DVOM between harness terminal “B”
and engine ground (–).
Is voltage reading over 4 volts?
MAP sensor faulty.
–
–
–
–
–
Step 10 Step 15
9
–
–
–
–
–
–
–
–
10
11
12
CKT 432 shorted to voltage.
CKT 432 shorted shorted to ground.
Faulty ECM.
Faulty connection at ECM, CKT 416 open,
shorted to ground, or faulty ECM.
13
14
–
–
–
–
–
–
Faulty connection at ECM, CKT 814 open or
faulty ECM.
Open CKT 432, faulty connection at ECM or
faulty ECM.
15
16
–
–
–
–
–
–
Repair low or unsteady vacuum problem.
Index
90-861326--1
MARCH 1999
Page 5F-13
| 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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