Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Tundra 2000-2006 Approved 04-06 techinfo.toyota.com ileaf 06toyrm 06toypdf 06rmsrc 06tundra di eg1grfe cip0121

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                                                                                                                                    DI-133
                                                 DIAGNOSTICS       -    ENGINE (1GR-FE)
                                                                                                                                     DIDTE-01




    DTC                   P0121            Throttle/Pedal Position Sensor/Switch "A"
                                           Circuit Range/Performance Problem
HINT:
This is the purpose of the "throttle position sensor".

CIRCUIT DESCRIPTION
Refer to DTC P0120 on page DI-123.
   DTC No.                       DTC Detecting Condition                                                 Trouble Area
               Condition (a) continues for 2.0 sec.:
    P0121      (a) Difference between VTA1 and VTA2 deviates from the        Throttle body
                   threshold


MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
This sensor includes two signals, VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and
VTA2 is used to detect malfunctions in VTA1. There are several checks that the ECM performs confirm prop-
er operation of the throttle position sensor and VTA1.
There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
If the voltage output difference of the VTA1 and VTA2 deviates from the normal operating range, the ECM
interprets this as a malfunction of the throttle position sensor. The ECM will turn on the MIL and a DTC is
set.

FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16

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