DTC DETECTION LOGIC NOTE： If DTC P0236 or P0240 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
P0236 | Turbocharger boost sensor circuit range/performance (bank 1) | A | In spite of the low boost, the signal voltage of the turbocharger boost sensor to the ECM is too high. |

- Harness or connectors
  (The sensor circuit is shorted.)
- Turbocharger boost sensor
- Boost control actuator stuck closed

B | In spite of the high boost, the signal voltage of the turbocharger boost sensor to the ECM is too low. |

- Harness or connectors
  (The sensor circuit is open.)
- Intake air leaks
- Exhaust gas leaks
- Recirculation valve
- Exhaust manifold and Turbocharger assembly
- Turbocharger boost sensor
- Boost control actuator

P0240 | Turbocharger boost sensor circuit range/performance (bank 2) | A | In spite of the low boost, the signal voltage of the turbocharger boost sensor to the ECM is too high. |

- Harness or connectors
  (The sensor circuit is shorted.)
- Turbocharger boost sensor
- Boost control actuator stuck closed

B | In spite of the high boost, the signal voltage of the turbocharger boost sensor to the ECM is too low. |

- Harness or connectors
  (The sensor circuit is open.)
- Intake air leaks
- Exhaust gas leaks
- Recirculation valve
- Exhaust manifold and Turbocharger assembly
- Turbocharger boost sensor
- Boost control actuator

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>>GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to Component Function Check (GT-R certified NISSAN dealer).
NOTE：
Use component function check to check the overall function of the turbocharger system circuit. During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES>>INSPECTION END
NO>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).