2001 TOYOTA SEQUOIA engine

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TOYOTA SEQUOIA 2001 Service Repair Manual DI±372
± DIAGNOSTICSENGINE
566 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a

DI±372
± DIAGNOSTICSENGINE
566 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a) continues for 0.5 seconds or more:
(a) VPA 0.2 V or VPA 4.8 VAccelerator pedal position sensor
ECM
P2122
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA 0.2 V
(b) VPA2 0.97 degAccelerator pedal position sensor
VCPA circuit open
VPA circuit open or ground short
ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA 4.8 VAccelerator pedal position sensor
EPA circuit open
ECM
P2125
Condition (a) continues for 0.5 seconds or more:
(a) VPA2 0.5 V or VPA2 4.8 V and 0.2 V VPA 3.45
VAccelerator pedal position sensor
ECM
P2127
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA2 0.5 V
(b) VPA 0.97 degAccelerator pedal position sensor
VCP2 circuit open
VPA2 circuit open or ground short
ECM
P2128
Condition (a) and (b) continues for 2.0 seconds or more:
(a) VPA2 4.8 V
(a) 0.2 V VPA 3.45 VAccelerator pedal position sensor
EPA circuit open
ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) |VPA ± VPA2| 0.02 V
(b) VPA 0.2 V and VPA2 0.5 VVPA and VPA2 circuit are short circuited
Accelerator pedal position sensor
ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand±held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble areaAccelerator pedal completely releasedAccelerator pedal fully depressedTrouble area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
E2 circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2 deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
When the voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail±safe operation will stop
and the system will return to normal condition.