Suzuki F6A - Ignition Timing Adjustment Register

126
Condition Possible Cause Correction
Engine cranks, but will
not start or hard to start
No Spark
 Blown fuse for ignition coil
 Loose connection or disconnection of lead
wires
 Faulty spark plug(s)
Replace
Connect securely
Adjust, clean or replace
Poor fuel economy or
engine performance
 Faulty spark plug(s)
Adjust, clean or replace
IGNITION TIMING
ADJUSTMENT REGISTER
Ignition timing adjustment is performed by means of a register. The resistance is classified into a total of twelve types,
and twelve stages of adjustment are possible.
Mark 1 2 3 4 5 6 7 8 9 10 11
Resistance Low High
Ignition timing Delay Advance
IGNITION TIME
ADJUSTMENT REGISTER
G
BL/Y
22 IAD
34
E2
5V
ECM
COLOR CODE
G – GREEN
Y – YELLOW
BL – BLUE
One end of the ignition timing adjustment register cou-
pler is connected to the ”IAD” terminal connected to the
5 V power supply via a pull–up resistor inside the ECM,
and the other end is grounded at the ”E2” terminal.
Depending upon the resistance of the register plugged
into the register coupler, the ”IAD” terminal voltage of
the ECM changes, and accordingly, the ECM deter-
mines which register has been plugged in, and performs
fine adjustment of the ignition timing.
When advancing the ignition timing, adjustment is per-
formed by replacement with a register having higher
resistance, and when delaying the ignition timing, by
replacement with a register having lower resistance.