Nissan Sentra B18 (2020-2025) Service Manual: P0088 Frp Control System

Dtc Description

DTC DETECTION LOGIC

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 P0088 is displayed with DTC P0090, first perform the trouble diagnosis for DTC P0090.

   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-1

   1. Check that the fuel tank is 1/8 full of fuel.

   2. Warm up the engine to the normal operating temperature and keep the engine speed at idle for 15 seconds.

      Note:

      Warm up the engine until “COOLANT TEMP/S” on “DATA MONITOR” of CONSULT reaches at least 70°C (158°F).

   3. Check 1st trip DTC.

   Is 1st trip DTC detected?

   YES >>

   Proceed to DTC Diagnosis Procedure.

   NO >>

   GO TO 4.

4. DTC CONFIRMATION PROCEDURE-2

   1. Cool the engine until the engine coolant temperature reaches 60°C (140°F) or less.

   2. Start the engine and let it idle at least 40 seconds.

   3. 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 P0087 is displayed with DTC P0090, first perform the confirmation procedure for DTC P0090.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK LOW FUEL PRESSURE

   Check low fuel pressure. Refer to Work Procedure.

   Is inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Check low fuel pressure system. Refer to Diagnosis Procedure.

3. CHECK HIGH PRESSURE FUEL PUMP

   Check high pressure fuel pump. Refer to Component Inspection.

   Is inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Replace error-detected parts.

4. CHECK FUEL LEAKAGE

   1. Start the engine.

   2. Visually check that the fuel pump, fuel rail, and fuel piping have no fuel leakage.

   Is inspection result normal?

   YES >>

   Check that the fuel system has no breakage, bend, and crush. Refer to Inspection.

   NO >>

   Repair or replace the error-detected parts.

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