2. Too lean mixture. Try increasing the main jet value.
3. Incorrect rotor fazing or timing. Check with a timing light.
4. Incorrect magnetic trigger polarity.
5. Check the micro fueling and boost limiter blocks and see if the settings there are correct. A
symptom will be that the milliseconds bar on the real time block will jump to 0.
10.1.9 Idle Control does not work
1. Check first if it is wires correctly as indicated on the drawing. If it is an idle valve, make sure
the diode is intact. If it is a stepper controller, make sure the sequence is wired correctly. It
may close instead of opening.
2. Faulty TPS setting. Make sure the TPS is calibrated correctly. It must go from 0 to 100%
over the full range.
3. Check the idle control settings according to the explanation.
4. Make sure that the throttle idle position is set correctly. The idle valve can only close as
much as this setting.
5. Check if the idle valve or stepper motor is not stuck. The idle valve can be pulsed with
12Volt to see if it opens and the stepper normally vibrates when the ignition is switched on.
It may still be stuck even if it vibrates. So take the stepper off and see if it opens.
6. If the green LED on the stepper idle controller is on during idle, it means that the idle
computer does not receive the RPM pulse from the ECU. Recheck the wiring. The green
wire must be connected to GP out 2 except for the Lexus computer where it is connected to
the RPM output.
7. If the green LED on the idle controller flash it means that the idle computer tries to adjust
the RPM but nothing happens. The idle motor itself is sticky or wired incorrectly. Open it up
and clean and lubricate. With the long shipment on ships it corrodes on the inside. The
wiring to the idle motor may be incorrect. The airway of the idle motor is blocked.
8. The USB converter or RS232 serial cable may interfere with the RPM output signal. Break
out pin 1,6 & 8. See ECU interface.
10.1.10 Auto Gearbox does not shift
1. Check to ensure correct wiring connection to the ECU.
2. The USB converter may interfere with the RPM output signal. Break out pin 1, 6 & 8. See
ECU interface.
10.1.11 Spark plugs does not last
1. Too rich fuel mixture.
2. Wrong temperature plugs
10.1.12 Flat Spot when accelerating
1. Other vacuum line tied into the Map sensor line.
2. Restricted vacuum line.
3. Too long vacuum line.
4. Too small port for Map sensor on intake manifold.
5. Incorrect setting of fuel maps.
10.1.13 Engine does not want to rev up
1. The Fuel Cut-Off settings are wrong.
2. The magnetic crank or distributor sensor’s negative and positive wires are changed around.
The gap may be too large.
3. Rev limiter is set too low
4. Incorrect setting of fuel maps.
5. Fuel pressure or flow rate to low. Dirty fuel filter.
6. Faulty fuel pump.
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