Possible Causes

Malfunction is detected when:

1. An excessively low or high voltage from the TP sensor No. 1 is sent to ECM.
2. An excessively low or high voltage from the TP sensor No. 2 is sent to ECM.
3. A difference between signals from sensor 1 and sensor 2 is out of the specified range.
4. ECM detects a voltage of power source for sensor is excessively low or high.
5. Closed throttle position learning value is excessively low.
6. Closed throttle position learning is not performed successfully, repeatedly.
7. Throttle valve opening angle, computed by the ECM from the input signals of sensor 1 and sensor 2, is out of the normal range.

Possible causes for malfunction "A", "B", "C", "D" and "G" are:

• Open or short in TP sensor No. 1 or 2 signal circuit.
• Defective electronic throttle control actuator.

Possible cause for malfunction "E" and "F" is:

• Defective electronic throttle control actuator.

ECM enters fail-safe mode if malfunction "A", "B", "C", "D" or "G" is detected. For descriptions of engine operating conditions in fail-safe mode, see Fig 1.

Fig 1: Identifying Engine Operating Conditions in Fail-Safe Mode

Courtesy of NISSAN MOTOR CO., U.S.A.