Accelerator Pedal Position Sensor

Reconnect all harness connectors disconnected.
Turn ignition switch ON.
Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Fig 1: Accelerator Pedal Position Sensor Voltage Chart (DTC P2138 APP Sensor)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Between ECM Terminals 106, 98 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, replace accelerator pedal assembly and go to next step.
Perform Accelerator Pedal Released Position Learning .
Perform Throttle Valve Closed Position Learning .
Perform Idle Air Volume Learning .