DTC DETECTION LOGIC NOTE： If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause
P0550 | Power steering pressure sensor circuit | An excessively low or high voltage from the sensor is sent to ECM. |

- Harness or connectors
  [Power steering pressure sensor circuit is shorted.]
  [CKP sensor (POS) circuit is open or shorted.]
  [CMP sensor (PHASE) (bank 2) circuit is shorted.]
  (Manifold absolute pressure sensor circuit is shorted.)
  (APP sensor 2 circuit is shorted.)
  (Refrigerant pressure sensor circuit is shorted.)
- Power steering pressure sensor
- Crankshaft position sensor (POS)
- Camshaft position sensor (PHASE) (bank 2)
- Manifold absolute pressure sensor
- Accelerator pedal position sensor
- Refrigerant pressure sensor

DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>>GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.

Is 1st trip DTC detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>INSPECTION END