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DI-309
DIAGNOSTICS - ENGINE (1GR-FE)
DIDU4-01
DTC P2121 Throttle/Pedal Position Sensor/Switch "D"
Circuit Range/Performance
HINT:
This is repair procedure for the "accelerator pedal position sensor".
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page DI-299.
DTC No. DTC Detecting Condition Trouble Area
Conditions (a) and (b) continue for 0.5 seconds: S Accelerator pedal position sensor circuit
P2121 (a) Difference between VPA and VPA2 exceeds the threshold S Accelerator pedal position sensor
(b) IDL is OFF S ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements/signal outputs: VPA1 and VPA2. VPA1 is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. When
the difference between the voltage outputs of VPA1 and VPA2 deviates from the standard, the ECM con-
cludes the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is
set.
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 "pass" 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.
MONITOR STRATEGY
Related DTCs P2121 Accelerator position sensor (rationality)
Required sensors/components Accelerator position sensor
Frequency of operation Continuous
Duration 0.5 sec.
MIL operation Immediate
Sequence of operation None
DI-310
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-18
not present
Either of the following conditions is met Condition 1 or 2
1. Ignition switch ON
2. Throttle control motor power ON
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Difference between VPA1 voltage (learned value) and VPA2
Less than 0.4 V, or more than 1.2 V
voltage (learned value)
WIRING DIAGRAM
Refer to DTC P2120 on page DI-299.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Connect hand-held tester, and read the voltage for accelerator pedal position
sensor data.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand-held
tester main switch ON.
(c) Enter the following menu: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL
POS #2.
CHECK:
Depressed Released
FI7052 Read the voltage for the accelerator pedal position sensor data.
OK:
Standard:
Accelerator pedal ACCEL POS #1 ACCEL POS #2
Released 0.5 to 1.1 V 1.2 to 2.0 V
Depressed 2.6 to 4.5 V 3.4 to 5.3 V
OK Replace ECM (See page SF-66).
NG
DI-311
DIAGNOSTICS - ENGINE (1GR-FE)
2 Check for open and short in harness and connector between accelerator pedal
position sensor and ECM.
Wire Harness Side: PREPARATION:
Accelerator Pedal Position Sensor (M/T) (a) Disconnect the A20 accelerator pedal position sensor
A20 connector.
(b) Disconnect the E3 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
EPA VCP2 OK:
VPA2 EPA2 VCPA VPA Standard:
A21022
Tester Connection Specified Condition
Wire Harness Side: VPA (A20-5) - VPA (E3-18)*1 Below 1
Accelerator Pedal Position Sensor (A/T)
VPA (A20-6) - VPA (E3-18)*2 Below 1
A20 EPA (A20-1) - EPA (E3-20)*1 Below 1
EPA (A20-5) - EPA (E3-20)*2 Below 1
VCPA (A20-4) - VCPA (E3-26) Below 1
VPA2 (A20-2) - VPA2 (E3-19)*1 Below 1
VPA2 (A20-3) - VPA2 (E3-19)*2 Below 1
VCP2 VPA
EPA2 VPA2 VCPA EPA EPA2 (A20-3) - EPA2 (E3-21)*1 Below 1
A21022
EPA2 (A20-2) - EPA2 (E3-21)*2 Below 1
VCP2 (A20-6) - VCP2 (E3-27)*1 Below 1
VPA2 E3
VCP2 (A20-1) - VCP2 (E3-27)*2 Below 1
VPA VPA (A20-5) or VPA (E3-18) -
10 k or higher
Body ground*1
VPA (A20-6) or VPA (E3-18) -
EPA2 10 k or higher
Body ground*2
EPA (A20-1) or EPA (E3-20) -
10 k or higher
Body ground*1
EPA
VCPA
VCP2 B17417 EPA (A20-5) or EPA (E3-20) -
10 k or higher
Body ground*2
VCPA (A20-4) or VCPA (E3-26) -
10 k or higher
Body ground
VPA2 (A20-2) or VPA2 (E3-19) -
10 k or higher
Body ground*1
VPA2 (A20-3) or VPA2 (E3-19) -
10 k or higher
Body ground*2
EPA2 (A20-3) or EPA2 (E3-21) -
10 k or higher
Body ground*1
EPA2 (A20-2) or EPA2 (E3-21) -
10 k or higher
Body ground*2
VCP2 (A20-6) or VCP2 (E3-27) -
10 k or higher
Body ground*1
VCP2 (A20-1) or VCP2 (E3-27) -
10 k or higher
Body ground*2
*1: M/T
*2: A/T
DI-311-1
DIAGNOSTICS - ENGINE (1GR-FE)
NG Repair or replace harness or connector.
OK
Replace accelerator pedal pedal assembly.
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