ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-9590-823225--1 1096
Code 42: IC Circuit (Non-Scan) (2 of 2)
DIAGNOSTIC AIDS:
An intermittent problem may be caused by a poor or
corroded connection, rubbed through wire connec-
tion, a wire that is broken inside the insulation, or a
corroded wire.
Any circuitry that is suspected as causing the inter-
mittent complaint should be thoroughly checked for
backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, poor
terminal-to-wiring connections, corroded terminals
and/or wiring, or physical damage to the wiring har-
ness. After repairs, clear codes following “Clearing
Codes” in “ECM Self-Diagnostics.” Failure to do so
may result in codes not properly being cleared.
00000
LIGHT “OFF”
CODE 42 NO CODE 42
• DISCONNECT IGNITION MODULE 4-WAY
CONNECTOR.
1
3
• WITH OHMMETER STILL CONNECTED TO ECM HARNESS
CKT 423 AND GROUND, AGAIN PROBE ECM HARNESS
CKT 424 WITH THE TEST LIGHT CONNECTED TO 12
VOLTS. AS TEST LIGHT CONTACTS CKT 424,
RESISTANCE SHOULD SWITCH FROM OVER 3KΩ TO
UNDER 1KΩ OHMS.
DOES IT?
• INSTALL MARINE DIAGNOSTIC CODE TOOL.
• CLEAR CODES (REFER TO CLEARING CODES).
• IDLE ENGINE FOR 1 MINUTE OR UNTIL MALFUNCTION INDICATOR
LAMP COMES “ON.”
• IGNITION “ON,” ENGINE STOPPED.
• ENTER SERVICE MODE ON CODE TOOL AND NOTE CODES.
CODE 42 INTERMITTENT. IF NO
ADDITIONAL CODES WERE STORED,
REFER TO “INTERMITTENTS” IN TROUBLE-
SHOOTING SECTION, OR “DIAGNOSTIC AIDS”
ABOVE WHERE APPLICABLE.
2
YESNO
• DISCONNECT DIST. 4-WAY CONNECTOR. NOTE OHM
METER THAT IS STILL CONNECTED TO CKT 423 AND
GROUND. RESISTANCE SHOULD HAVE GONE HIGH (OPEN
CIRCUIT). DOES IT?
• RECONNECT ECM AND IDLE ENGINE FOR
ONE MINUTE OR UNTIL MALFUNCTION IN
DICATOR LAMP COMES “ON.”
YES NO
CKT 424 OPEN. FAULTY
CONNECTIONS OR FAULTY
IGNITION MODULE.
CKT 423
SHORTED TO
GROUND.
• IGNITION “OFF.”
• DISCONNECT ECM CONNECTORS J1 AND J2
• IGNITION “ON.”
• DVOM SELECTOR SWITCH IN THE OHM RANGE
• PROBE ECM HARNESS CONNECTOR CKT 423 WITH AN
OHMMETER TO GROUND.
IT SHOULD READ MORE THAN 3KΩ OHMS.
DOES IT?
YES NO
OPEN CKT 423. FAULTY CONNECTION
OR FAULTY IGNITION MODULE.
• PROBE ECM HARNESS CONNECTOR CKT 424 WITH
A TEST LIGHT TO 12 VOLTS AND NOTE LIGHT.
LIGHT “ON”
45
LIGHT “ON” LIGHT “OFF”
CKT 424 SHORTED
TO GROUND.
FAULTY IGNITION
MODULE.
LIGHT “ON” LIGHT “OFF”
CODE 42
CODE 42 INTERMITTENT.
FAULTY ECM
NO TROUBLE FOUND. CHECK
HARNESS AND CONNECTORS FOR AN
INTERMITTENT OPEN OR SHORT TO
GROUND IN CKT 423 AND 424.
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