Circuit Description

TP sensor is a potentiometer. At low throttle angle, TP sensor voltage is low. PCM uses TP sensor signal voltage to determine idle, Wide Open Throttle (WOT), deceleration enleanment and acceleration enrichment. This test monitors both the MAP and TP sensors. Engine operation requires that any large change in throttle position must be followed by a change in manifold pressure. If MAP remains constant following a large change in throttle angle, DTC will set.