Mercury 305 CID - Page 618

ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-7790-823225--1 1096
Ignition System Check(1 of 2)
SPARK
CHECK FUEL, SPARK PLUGS, ETC.
SEE “TROUBLESHOOTING.”
1
• DISCONNECT 4 TERMINAL CONNECTOR
ON DISTRIBUTOR AND CHECK FOR
SPARK.
• DISCONNECT TACH BEFORE PROCEEDING WITH THE TEST.
• CHECK SPARK AT PLUG WIRE USING AN INDUCTIVE PICKUP TIMING LIGHT
WHILE CRANKING. A FLASHING LIGHT INDICATES SPARK. (IF NO SPARK ON FIRST
WIRE, CHECK SECOND WIRE.) A FEW SPARKS AND THEN NOTHING
IS CONSIDERED NO SPARK.
NO SPARK
• CHECK FOR SPARK AT COIL WIRE WITH TIMING
LIGHT WHILE CRANKING. (LEAVE TIMING LIGHT
CONNECTED TO COIL WIRE FOR STEPS 3-6).
DISCONNECT DISTRIBUTOR 2 WIRE TERMINAL
• “C/+” PNK/BRN CONNECTOR.
IGNITION SWITCH “ON,” ENGINE STOPPED.
• CHECK VOLTAGE AT “+ BRN” AND “C PNK” TERMI
NALS OF DISTRIBUTOR HARNESS CONNECTION.
1A
2
3
• RECONNECT DISTRIBUTOR 2
TERMINAL CONNECTOR.
• WITH IGNITION “ON,” CHECK VOLT-
AGE FROM TACH. TERMINAL TO
GROUND
BOTH TERMINALS 10
VOLTS OR MORE
CHECK FOR OPEN OR
GROUND IN CKT. FROM “C”
TERMINAL TO IGNITION COIL.
IF CKT IS OK, FAULT IS IGNI-
TION COIL OR CONNECTION.
UNDER 10 VOLTS “C
PNK”TERMINAL ONLY
4
REPAIR OPEN TACH.
LEAD OR CONNEC-
TION AND REPEAT
TEST #4.
• CONNECT TEST LIGHT FROM TACH.
TERMINAL TO GROUND.
• CRANK ENGINE AND OBSERVE
LIGHT.
OVER 10 VOLTS
REPLACE MODULE AND
CHECK FOR SPARK FROM
COIL AS IN STEP 6.
UNDER 1 VOLT
1 TO 10 VOLTS
REPLACE
IGNITION
COIL.
NO
SPARK
SPARK
SYSTEM
OK
REPAIR WIRE FROM MOD-
ULE “+” TERMINAL TO “B”
TERMINAL OF BLACK IGNI-
TION COIL CONNECTOR
OR PRIMARY CKT. TO IGNI-
TION SWITCH.
BOTH TERMINALS
UNDER 10 VOLTS
CHART CONTINUED
ON PAGE 79
a
b
INSPECT CAP FOR WATER,
CRACKS, ETC. IF OK,
REPLACE ROTOR.
REPLACE MAGNETIC
SHAFT ASSEMBLY.
SPARK
NO SPARK
SPARK
NO SPARK