Throttle Position Sensor for TD5 Defender Engine Management System - VIN 607225 | Page 320
18
ENGINE MANAGEMENT SYSTEM
16
DESCRIPTION AND OPERATION
On Defender models, at wide open throttle, track 2 returns a signal of 0.28V and track 1 returns a signal of 4.7V to
the ECM. The ECM calculates the sum of these two figures which totals 5.0V.
The ECM uses this strategy to error check the TP sensor signal and ensure that the requested throttle position is
applied. The third potentiometer track measures the tolerance of tracks 1 and 2 and provides an improved
functionality check of the pedal angle.
NOTE: Three track TP sensors cannot be fitted as replacements on vehicles previously fitted with
two track TP sensors. Replacement ECM’s are configured for two track TP sensors and can be
fitted to all Td5 models. When replacement ECM’s are fitted to vehicles using three track TP
sensors, TestBook must be used to configure the ECM for three track TP sensor use.
If the TP sensor fails, the ECM will illuminate the MIL and the engine will operate at normal idle speed only.
