Mercury 305 CID - Page 600

ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-5990-823225--1 1096
Engine Cranks but Will Not Run (Continued)
Chart A-3: (2 of 4)
BLINKING LIGHT
BASIC HEI
PROBLEM. REFER TO
IGNITION SYSTEM
CHECK.
YES
YES NO
NO
REPLACE INJECTOR(S)
THAT IS OUT OF RANGE.
NOYES
• FAULTY CONNECTION
OR IGNITION MODULE.
CKT 430 OPEN,
SHORTED TO
GROUND,
OR FAULTY ECM.
1
2
3
4
• USING AN INDUCTIVE PICKUP TIMING
LIGHT CONNECTED TO ANY SPARK
PLUG WIRE, CHECK FOR SPARK
WHILE CRANKING (CHECK TWO WIRES).
IS SPARK PRESENT?
YES
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.
NOTE 2: A TACHOMETER MAY BE USED IF A SCAN TOOL
IS NOT AVAILABLE.
CHECK FOR
BATTERY
VOLTAGE TO
IGNITION SYSTEM.
IF OK, THERE IS A
BASIC HEI
PROBLEM. THEN
REFER TO IGNI-
TION SYSTEM
CHECK.
2
NO BLINKING LIGHT
USE CHART
A-3 (4 OF 4)
OK NOT OK
• IGNITION “OFF.”
• INSTALL FUEL PRESSURE GAUGE AND NOTE
PRESSURE WHILE CRANKING ENGINE
SHOULD BE 36 PSI (248 kPa) NOMINAL.
USE APPROPRIATE CHART A-7
MULTI-PORT OR THROTTLE BODY
OK NOT OK
5
NO
• USING AN INDUCTIVE PICKUP TIMING LIGHT
CONNECTED TO ANY SPARK PLUG WIRE,
CHECK FOR SPARK WHILE CRANKING
(CHECK TWO WIRES).IS SPARK PRESENT?
• REVIEW THE “DIAGNOSTIC AIDS” ON FACING
PAGE FOR ADDITIONAL ITEMS TO CHECK. IF ALL
ARE OK, EFI SYSTEM IS OK.
REFER TO “HARD START” IN THE
TROUBLESHOOTING SECTION.
• CHECK RESISTANCE ACROSS
EACH INJECTOR AND COMPARE
VALUES.
IS RESISTANCE 12 OHMS
± .4?
• DISCONNECT ALL
INJECTORS.
• CONNECT TEST LIGHT
J-34730-2 OR EQUIVALENT
TO INJECTOR HARNESS
CONNECTOR. (TEST ONE
INJECTOR HARNESS FROM
EACH GROUPING OF
INJECTORS.)
• CHECK FOR BLINKING LIGHT
WHILE CRANKING.
• ENSURE THE ENGINE IS NOT IN SERVICE OR BASE TIMING
MODE
• CHECK THAT LANYARD STOP SWITCH IS NOT ACTIVATED
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.
IS RPM INDICATED DURING CRANKING? (NOTE 2)
• IGNITION “OFF.”
• DISCONNECT DISTRIBUTOR
4-WAY CONNECTOR.
• IGNITION “ON.”
• MOMENTARILY TOUCH
HARNESS CONNECTOR
TERMINAL (CKT 430) WITH A
TEST LIGHT TO 12 VOLTS.
• SCAN TOOL OR
TACHOMETER SHOULD
INDICATE RPM WHEN TEST
IS PERFORMED.
DOES IT?
PLACE THE LANYARD STOP
SWITCH IN THE RUN POSITION
REFER TO LANYARD
STOP CIRCUIT CHECK
NO BLINKING LIGHT