DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Code 34 (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.
3.
4.
c. Start engine and raise rpm to 1000 in NEUTRAL.
Is the vacuum reading steady and above 14 in. HG
Step 4. Step 9.
Step 5. Step 11.
(45.5
kPa)?
Allow the engine to idle.
Does the scan tool indicate MAP sensor voltage less
than 1 volt?
a. Ignition OFF.
b. Disconnect MAP sensor harness connector.
c. Connect a jumper wire from harness terminal “B” CKT
432 to harness terminal “C” CKT 416.
5.
6.
d. Ignition ON, engine OFF.
Does the scan tool indicate MAP sensor voltage
greater than 4 volts?
Step 10. Step 6.
a. Ignition OFF.
b. Connect DVOM from harness terminal “C” CKT 416 to
a known good ground.
c. Ignition ON, engine OFF.
Does the scan tool indicate MAP sensor voltage
greater than 4 volts?
Step 12. Step 13.
a. Switch CodeMate Tester to “Normal Mode”.
b. Ignition OFF.
c. Disconnect MAP sensor harness connector.
d. Connect a jumper wire from terminal “B” CKT 432 to
harness terminal “C” CKT 416.
7.
e. Start engine and raise rpm to 1000 in NEUTRAL.
f.
Ignition ON, engine OFF.
g. Switch CodeMate Tester to “Service Mode” and watch
for a trouble code.
Is trouble code 33 present?
Step 11. Step 8.
Index
Page 5G-72
90-861327--1 OCTOBER 1999
| 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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