Toyota Celica 2005 Repair Manual page 798

DTC No.
Condition (a) continues for 0.5 sec. or more:
P2120 (a) VPA is 0.2 V or less and VPA2 is 0.97 deg or more, or VPA
is 4.8 V or more
Conditions (a) and (b) continue for 0.5 sec. or more:
P2122 (a) VPA is 0.2 V or less
(b) VPA2 is 0.97 deg or more
Condition (a) continues for 2.0 sec. or more:
P2123
(a) VPA is 4.8 V or more
Condition (a) continues for 0.5 sec. or more:
(a) (VPA2 is 0.5 V or less and VPA is 0.97 deg or more) or
P2125
(VPA2 is 4.8 V or more and VPA is between 0.2 V and 3.45
V)
Conditions (a) and (b) continue for 0.5 sec. or more:
P2127 (a) VPA2 is 0.5 V or less
(b) VPA is 0.97 deg or more
Conditions (a) and (b) continue for 2.0 sec. or more:
P2128 (a) VPA2 is 4.8 V or more
(b) VPA is 0.2 V or more and VPA is 3.45 V or less
Condition (a) or (b) continues for 2.0 sec. or more:
P2138 (a) Difference between VPA and VPA2 is 0.02 V or less
(b) VPA is 0.2 V or less and VPA2 is 0.5 V or less
HINT:
After confirming DTCs "P2120, P2122, P2123, P2125, P2127, P2128 and P2138", use the hand−held tester
or the OBD II scan tool to confirm the accelerator pedal position sensor output voltage.
Trouble Area
VCP circuit open
VPA circuit open or ground short
VPA2 circuit open or ground short
EPA circuit open
MONITOR DESCRIPTION
When VPA or VPA2 deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than the 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:
The voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
2005 CELICA (RM1131U)
DIAGNOSTICS
DTC Detection Condition
Accelerator pedal released
ACCEL POS #1
0 to 0.2 V
0 to 0.2 V
0.5 to 1.1 V
4.5 to 5.5 V
− ENGINE (2ZZ−GE)
S Accelerator pedal position sensor
S ECM
S Accelerator pedal position sensor
S Open in VCP1 circuit
S VPA circuit open or ground short
S ECM
S Accelerator pedal position sensor
S Open in EPA circuit
S ECM
S Accelerator pedal position sensor
S ECM
S Accelerator pedal position sensor
S Open in VCP2 circuit
S VPA2 circuit open or ground short
S ECM
S Accelerator pedal position sensor
S Open in EPA2 circuit
S ECM
S VPA and VPA2 circuits are short−circuited
S Accelerator pedal position sensor
S ECM
Accelerator pedal position expressed as voltage output
ACCEL POS #2
0 to 0.2 V
1.2 to 2.0 V
0 to 0.2 V
4.5 to 5.5 V
797
Trouble Area
Accelerator pedal depressed
ACCEL POS #1 ACCEL POS #2
0 to 0.2 V 0 to 0.2 V
0 to 0.2 V 3.4 to 5.3 V
2.6 to 4.5 V 0 to 0.2 V
4.5 to 5.5 V 4.5 to 5.5 V
DI−599