P1221 Tps1 - Tps2 Correlation(Circuit Performance) - Isuzu 2000 Trooper Workshop Manual

P1221 TPS1 – TPS2 correlation(Circuit Performance)
Circuit Description
D The powertrain control module (PCM) controls engine
speed by adjusting the position of the throttle control
valve (DC motor). The throttle motor is a DC motor
driven by one coil. The PCM applies current to DC
motor coil in steps (%) to adjustment the valve into a
passage in the throttle body to air flow.
This method allows highly accurate control of
engine speed and quick response to changes in
engine load.
D The acceleration position (AP) sensor circuit provides
a voltage signal relative to acceleration pedal angle.
The acceleration pedal angle (AP1) will vary about
13% at idle position to about 87% at open
throttle(WOT).
APS signal is used to determine which DC will
adjusting throttle position.
After the APS signal has been processed by the
PCM, it will command DC motor to allow a move
of throttle position.
D Acceleration pedal – Check for objects blocking the AP
sensor or pedal arm with spring, and excessive
deposits in the acceleration pedal arm and on the
acceleration pedal.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnosis Truble Code(DTC)
2. Visually/physically inspect for the following throttle
valve conditions.
3.Visually/physically inspect for the following
acceleration pedal conditions.
5.Check the following circuits for throttle valve and DC
moter. Check the following TP sensor resistance
and DC motor.
7.Check the following circuits for acceleration pedal.
Check the following AP sensor resistance.
9.Following DTC: Software detect Error for ETC
system.
10.Following DTC: Software detect Error for ETC
system.
Diagnostic Aids
D An intermittent may be caused by a poor connection,
rubbed–through wire insulation or a wire broken inside
the insulation. Check for poor connections or a
damaged harness. Inspect the PCM harness and
connector for improper mating, broken locks,
improperly formed or damaged terminals, poor
terminal-to-wire connection,
harness.
D Throttle body – Check for objects blocking the DC
motor or throttle bore, excessive deposits in the ETC
passage and on the valve spring, and excessive
deposits in the throttle bore and on the throttle valve
plate.
6E–419
D06RY00157
and damaged