Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 148
11.10.1 Throttle Parameter Description
Diagnostic Lower Limit
The lower diagnostic limit is the absolute minimum raw value accepted as a
valid signal by the engine ECM. Any values below this point will flag
appropriate diagnostics and invoke the limp-home strategy. Most analogue
devices are classed as faulted with a voltage of 0.25V and below (5%) this is
to prevent a possible open or short circuit being mistaken for a valid signal, for
similar reasons a PWM duty cycle should not fall below 5% duty cycle.
Lower Position limit
This is the minimum point of the lower calibration boundary
Initial Lower Position limit
This is the maximum point of the lower calibration boundary. This value is also
used as the initial lower position when no calibration has been applied.
Lower Deadzone
This position is given as a discrete raw signal percentage value. The lower
dead zone effectively gives some play at the lower position. This dead band is
expressed in terms of a raw signal percentage, such that the initial lower
position plus the lower dead zone will give the 0% throttle position.
Initial Upper Position limit
This is the minimum point of the upper calibration boundary. This value is also
used as the initial upper position when no calibration has been applied.
Upper Position Limit
This is the maximum point of the upper calibration boundary
Upper Deadzone
This position is given as a discrete raw signal percentage value. The upper
dead zone effectively gives some play at the upper position. This dead band is
expressed in terms of a raw signal percentage, such that the initial upper
position minus the upper dead zone will give the 100% throttle position.
Diagnostic Upper Limit
The upper diagnostic limit is the absolute maximum raw value accepted as a
valid signal by the engine ECM. Any values above this point will flag
appropriate diagnostics and invoke the limp-home strategy. Most analogue
devices are classed as faulted with a voltage of 4.75V and above, this is to