Troubleshooting
DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D"/ "E" VOLTAGE CORRELATIONCIRCUIT DESCRIPTION
DTC Detecting Condition:
HINT:
- This electrical throttle system does not use a throttle cable.
- This is procedure of accelerator pedal position sensor.
The accelerator pedal position sensor is mounted on the accelerator pedal bracket and has the 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor.
In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA1 and VPA2 of the ECM changes between 0 V and 5 V, in proportion to the opening angle of the accelerator pedal. The VPA1 is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.
The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA1 and VPA2 the ECM controls the throttle motor based on these signals.
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 throttle valve opening percentage.
Wiring Diagram:
INSPECTION PROCEDURE
HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
Step 1 - 2:
Step 3 - 4:
Step 5:
Hand-held tester
Step 1:
Step 2 - 3:
Step 4:
OBD II scan tool (excluding hand-held tester)