Nissan Sentra B18 (2020-2025) Service Manual: P0090 Fuel Rail Pressure Control System

Dtc Description

DTC DETECTION LOGIC

DTC P0090 may be displayed when running out of gas.

POSSIBLE CAUSE

• Harness or connectors (The high pressure fuel pump circuit is open or shorted.)

• High pressure fuel pump

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Sentra Vehicle behavior
Traveling control mode	Accelerator angle variation control	ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction. Note: ECM does not control the accelerator pedal releasing speed.
Device fix mode		This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position. The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).
Combustion control mode	Stratified charge combustion control at starting	No stratified charge combustion at starting (cold start).

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC P0090 is displayed with DTC P1197, first perform the trouble diagnosis for DTC P1197.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. PRECONDITIONING

   If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

   TESTING CONDITION:

   • Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

   • Before performing the following procedure, check that the fuel tank is 1/8 full of fuel.

   >>

   GO TO 3.

3. DTC CONFIRMATION PROCEDURE

   With CONSULT

   1. Start the engine.

   2. Select “COOLANT TEMP/S” in “DATA MONITOR” of “ENGINE” using CONSULT

   3. Maintain the following condition for 5 seconds or more at idle.

      COOLANT TEMP/S

      70°C (158°F) or more

   4. Check 1st trip DTC.

   Is 1st trip DTC detected?

   YES >>

   Proceed to DTC Diagnosis Procedure.

   NO-1 >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

1. CHECK DTC PRIORITY

   If DTC P0090 is displayed with DTC P1197, first perform the trouble diagnosis for DTC P1197.

   Is DTC P1197 detected?

   YES >>

   Perform diagnosis for P1197. Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK HIGH PRESSURE FUEL PUMP CIRCUIT

   1. Turn ignition switch ON.

   2. Disconnect ECM harness connector and high pressure fuel pump harness connector.

   3. Check the continuity between ECM harness connector and high pressure fuel pump harness connector.

      ECM		High pressure fuel pump		Continuity
      Connector	Terminal	Connector	Terminal
      F25	67	F32	1	Existed
      	68		2

   4. Also check harness for short to power and short to ground.

   Is inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair or replace the error-detected parts.

3. CHECK HIGH PRESSURE FUEL PUMP

   Check high pressure fuel pump. Refer to Component Inspection.

   Is inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Replace error-detected parts.

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