Code 33: MAP Circuit (Scan)
(2 of 2)
•
IF ENGINE IDLE IS ROUGH, UNSTABLE, OR
INCORRECT, CORRECT CONDITION
BEFORE USING CHART, SEE THE
TROUBLESHOOTING SECTION.
ENGINE IDLING.
•
DOES SCAN TOOL DISPLAY A MAP
SENSOR VOLTAGE OF LESS THAN 1 VOLT
OR GREATER THAN 4 VOLTS?
YES
NO
CODE 33 IS INTERMITTENT, IF NOT
ADDITIONAL CODES WERE STORED,
REFER TO “DIAGNOSTIC AIDS” ON
FACING PAGE.
VOLTAGE LESS THAN 1 VOLT.
VOLTAGE GREATER THAN 4 VOLTS.
1
•
•
IGNITION “OFF.”
DISCONNECT MAP SENSOR ELECTRICAL
CONNECTOR.
2
•
•
IGNITION “OFF.”
DISCONNECT MAP SENSOR ELECTRICAL
CONNECTOR.
•
•
JUMPER MAP SENSOR HARNESS TERMINALS
•
•
START ENGINE.
“
C” AND “B” TOGETHER.
“SCAN” TOOL SHOULD DISPLAY A
VOLTAGE OF LESS THAN 1 VOLT.
DOES IT?
START ENGINE.
DOES SCAN TOOL DISPLAY MAP SENSOR
VOLTAGE GREATER THAN 4 VOLTS?
NO
YES
YES
NO
•
•
IGNITION “OFF.”
CHECK FOR MAP
SENSOR SIGNAL CKT
•
•
IGNITION “OFF.”
•
•
IGNITION “OFF.”
CONNECT DVOM BETWEEN
MAP SENSOR HARNESS
TERMINAL “C” AND A.
IGNITION “ON.”
IS VOLTAGE OVER 4 VOLTS?
CONNECT DVM
BETWEEN MAP
SENSOR HARNESS
TERMINAL “A”
AND “C”.
IGNITION “ON.”
VOLTAGE SHOULD
BE GREATER THAN
MAP SENSOR
SIGNAL CKT 432
SHORTED TO
VOLTAGE
432
SHORTED TO
GROUND. IF OK,
REPLACE MAP
SENSOR.
•
OR
•
•
FAULTY ECM
CONNECTIONS
OR
FAULTY ECM.
4
VOLTS.
NO
YES
IS IT?
CKT 416 OPEN FAULTY
ECM CONNECTION
OR
MAP SENSOR SIGNAL
CKT 432 OPEN OR
SHORTED TO
GROUND
OR
FAULTY CONNECTION
AT ECM
YES
NO
FAULTY ECM.
FAULTY MAP SENSOR
OPEN SENSOR
GROUND CIRCUIT
OR
FAULTY ECM.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-107
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you