Engine Cranks but Will Not Run (Continued)
Chart A-3: (2 of 4)
1
•
•
ENSURE THE ENGINE IS NOT IN SERVICE OR BASE TIMING
MODE
CHECK THAT LANYARD STOP SWITCH IS NOT ACTIVATED
NOTE 1: IF A SCAN TOOL IS NOT AVAILABLE WHILE
CHECKING TP AND ECT READINGS, USE THE
CODE 21 AND 14 NON-SCAN DIAGNOSTIC
CHARTS TO ENSURE PROPER OPERATION
OF THOSE COMPONENTS.
CHECK THE FOLLOWING. (NOTE 1)
•
•
ACTUAL ENGINE TEMPERATURE AND ECT TEMPERATURE
ON THE SCAN TOOL SHOULD BE CLOSE TO THE SAME, IF
NOT REFER TO CODE 14.
TP SENSOR - IF OVER 2.5 VOLTS AT CLOSED THROTTLE,
USE THE CODE 21 CHART.
NOTE 2: A TACHOMETER MAY BE USED IF A SCAN TOOL
IS NOT AVAILABLE.
IS RPM INDICATED DURING CRANKING? (NOTE 2)
PLACE THE LANYARD STOP
SWITCH IN THE RUN POSITION
YES
NO
•
USING AN INDUCTIVE PICKUP TIMING
LIGHT CONNECTED TO ANY SPARK
PLUG WIRE, CHECK FOR SPARK
WHILE CRANKING (CHECK TWO WIRES).
IS SPARK PRESENT?
•
USING AN INDUCTIVE PICKUP TIMING LIGHT
CONNECTED TO ANY SPARK PLUG WIRE,
CHECK FOR SPARK WHILE CRANKING
(CHECK TWO WIRES).IS SPARK PRESENT?
3
YES
NO
YES
NO
•
•
IGNITION “OFF.”
DISCONNECT DISTRIBUTOR
2
2
•
•
DISCONNECT ALL
INJECTORS.
BASIC HEI
CHECK FOR
BATTERY
VOLTAGE TO
IGNITION SYSTEM.
IF OK, THERE IS A
BASIC HEI
PROBLEM. THEN
REFER TO IGNI-
TION SYSTEM
CHECK.
PROBLEM. REFER TO
IGNITION SYSTEM
CHECK.
4-WAY
CONNECTOR.
CONNECT TEST LIGHT
J-34730-2 OR EQUIVALENT
TO INJECTOR HARNESS
CONNECTOR. (TEST ONE
INJECTOR HARNESS FROM
EACH GROUPING OF
INJECTORS.)
•
•
IGNITION “ON.”
MOMENTARILY TOUCH
HARNESS CONNECTOR
TERMINAL (CKT 430) WITH A
TEST LIGHT TO 12 VOLTS.
•
SCAN TOOL OR
•
CHECK FOR BLINKING LIGHT
WHILE CRANKING.
TACHOMETER SHOULD
INDICATE RPM WHEN TEST
IS PERFORMED.
DOES IT?
4
5
NO BLINKING LIGHT
BLINKING LIGHT
REFER TO LANYARD
STOP CIRCUIT CHECK
•
CHECK RESISTANCE ACROSS
EACH INJECTOR AND COMPARE
VALUES.
NO BLINKING LIGHT
YES
NO
USE CHART
A-3 (4 OF 4)
•
FAULTY CONNECTION
OR IGNITION MODULE.
CKT 430 OPEN,
SHORTED TO
GROUND,
IS RESISTANCE 12 OHMS ± .4?
OR FAULTY ECM.
OK
NOT OK
REPLACE INJECTOR(S)
THAT IS OUT OF RANGE.
•
•
IGNITION “OFF.”
INSTALL FUEL PRESSURE GAUGE AND NOTE
PRESSURE WHILE CRANKING ENGINE
SHOULD BE 36 PSI (248 kPa) NOMINAL.
OK
NOT OK
•
REVIEW THE “DIAGNOSTIC AIDS” ON FACING
PAGE FOR ADDITIONAL ITEMS TO CHECK. IF ALL
ARE OK, EFI SYSTEM IS OK.
USE APPROPRIATE CHART A-7
MULTI-PORT OR THROTTLE BODY
REFER TO “HARD START” IN THE
TROUBLESHOOTING SECTION.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-57
| 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