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B. Ignition Timing Correction
CAUTION :
This function corrects the gaps for the optimum ignition timing according to the
difference of the characteristics of the fuel used.
Ignition timing must not be set at too early a (plus side) timing since it may
cause problems. If no difference is felt as a result of correction, the ignition
timing should be set on the slower side.
FA-FC: IGNITION TIMING ADJUSTMENT RANGE
FA: Adjusts the ignition timing at a throttle opening of 25% or less and at an engine
speed of 3000 rpm or more, with a tolerance of ±15°.
FB: Adjusts the ignition timing at a throttle opening of 25% or more and 90% or less
and at an engine speed of 3000 rpm or more with a tolerance of ±10°.
FC: Adjusts the ignition timing at a throttle opening of 90% or more and at an engine
speed of 3000 rpm or more.
This range is apt to cause problems, according to engine tuning. In particular,
if the setting is on the + side, change degrees one by one while checking the
result.
C. Adjustment of the RAM-Pressure Fuel Volume Correction
FD: This ECU is designed to correct the fuel injection volume in response to engine
speed.
Generally this requires no change.
This adjustment is made when a change occurs in the shape of the intake
compared with standard, or when the intake duct is removed to avoid its being
subjected to RAM pressure.
The adjustment is made with a tolerance of ±10 steps; +10 provides
approximately two (2) x as much corrected volume and –10 provides
a zero (0) corrected volume with no change due to engine speed.
ENGINE SPEED (rpm)
THROTTLE OPENING (%)
90
25
0
3000
FC
FB
FA
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