Trouble
shooting
There
are common problems that installer make that hinder proper operation and
reliability. Especially if custom harnesses are made. Below are a few examples:
- Make
sure the TxW earth and ECU earth is mounted on a proper place on the body
of the car. Do not make long earth leads to the battery. See the power
wiring section in the ECU manual.
- The
power on the relay pin 30 must come from the battery with thick wires. Do
cot connect pin 87 to the ECU relays.
- If
the power wires are too thin, then the throttle calibrations change once
you start the engine. This may also be due to the alternator wiring that
connects with the power harness.
- The
ECU power comes from the key power circuit and not the same power that
supply the throttle. This usually make interference in the RPM signal.
- Make
sure the RPM signal is constant and stable. Erratic behavior will result
in incorrect idle control.
- The
free-wheel diodes must also have a proper earth and power wire. Earth must
go to the ECU earth point and positive to pin 87.
- Do
calibration and setup in the same order as discussed in the manual. Make
sure the throttle flap open, close and rest after you calibrated pedal
TPS.
- If
you set up the system and it does not perform like the document say
investigate or contact your dealer for support. Do not let a half done
project go into the street.
- Make
sure you wire the resistors in as the harness drawing suggest. The reason
is that it is fail safe resistors in case a wire breaks off. See the Limp
Mode Testing section.
- Throttle
is hunting on idle control. Make sure the ECU settings on idle fuel and
timing settings is correct. See the idle control tuning section. It could
also be incorrect settings of gain and rest position.
Error
Codes
Two
error codes are implemented to show common cutout issues. This is due to the
TPS value that went outside the calibration limits. It could be due to a faulty
wire to a TPS Sensor or voltage drops on wires due to incorrect thickness or
power sharing. Filter diodes could also be the culprit.
Error
Value 29 – Pedal TPS Sensor Failure or Calibration limits breached.
Error
Value 37 – Throttle TPS Sensor Failure or Calibration limits breached.