SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Code 33 (2 of 3): Manifold Absolute Pressure (MAP) Sensor Circuit
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
2.
Step 2.
OBD
Are you using a Scan Tool?
Step 3. Step 7.
a. Ignition OFF.
b. Install a vacuum gauge to manifold vacuum.
c. Start engine and raise rpm to 1000 in NEUTRAL.
Is the vacuum reading steady and above 14 in. HG
3.
4.
5.
Step 4. Step 10.
Step 5. Step 11.
(45.5
kPa)?
Allow the engine to idle.
Does the scan tool indicate MAP sensor voltage
greater than 4 volts?
a. Ignition OFF.
b. Disconnect MAP sensor harness connector.
c. Ignition ON, engine OFF.
Does the scan tool indicate MAP sensor voltage less
than 1 volt?
Step 6. Step 13.
a. Ignition OFF.
b. Connect DVOM from harness terminal “A” CKT 814 to
harness terminal “C” CKT 416.
6.
7.
c. Ignition ON, engine OFF.
Does the scan tool indicate MAP sensor voltage
greater than 4 volts?
Step 12. Step 14.
Step 8. Step 10.
a. Ignition OFF.
b. Install a vacuum gauge.
c. Start engine and raise rpm to 1000 in NEUTRAL.
Is the vacuum reading steady and above 14 In. Hg
(45.5
kPa)?
Index
90-861327--1
OCTOBER 1999
Page 5G-69
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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