DTC Detection Logic

WARNING: This page is about a different car, the 2011 Nissan 370Z. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If DTC P0820 is displayed with DTC P0335, P0340 or P0345, first perform the trouble diagnosis for DTC P0335, P0340 or P0345. Refer to "DTC LOGIC " or "DTC LOGIC ".
If DTC P0820 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to "M/T MODELS : DTC LOGIC ".

DTC DETECTION LOGIC

DTC No.	Trouble diagnosis name	DTC detecting condition		Possible cause
P0820	Gear lever position sensor circuit	A	An excessively low voltage from the sensor is sent to ECM. An excessively high voltage from the sensor is sent to ECM.	Harness or connectors (Gear lever position sensor circuit is open or shorted.) [CKP sensor (POS) circuit is shorted.] (APP sensor 2 circuit is shorted.) (EVAP control system pressure sensor circuit is shorted.) (Refrigerant pressure sensor circuit is shorted.) (Brake booster pressure sensor circuit is shorted.) Gear lever position sensor Crankshaft position sensor (POS) Accelerator pedal position sensor EVAP control system pressure Refrigerant pressure sensor Brake booster pressure sensor Transmission
P0820	Gear lever position sensor circuit	B	There is a difference between target engine speed calculated by ECM and actual engine speed.