DTC Troubleshooting: P0088 (L4) - Honda Accord CR/CT 2012-2017

DTC Troubleshooting: P0088

DTC P0088: Fuel Rail Pressure Too High

NOTE:

	Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
	If any of the DTCs listed below are stored at the same time as P0088, troubleshoot those DTCs first, then recheck for P0088. P0192, P0193: Fuel rail pressure sensor P0201, P0202, P0203, P0204: No. 1?No. 4 cylinder injector(s) P0351, P0352, P0353, P0354 : No. 1?No. 4 cylinder ignition coil(s) P219A: Air fuel ratio variation of cylinders P2623: High pressure fuel pump spill valve malfunction

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0088 Fuel Rail Pressure Too High

Problem verification-at idling:

Problem verification-at idling

?1.	Record all freeze data and the on-board snapshots with the HDS.

?2.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?3.	Clear the DTC with the HDS.

?4.	Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?5.	Select the DI FUEL PRESSURE TEST in the INSPECTION MENU with the HDS.

?6.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0088 Fuel Rail Pressure Too High

Is DTC P0088 indicated?


	YES

Go to step 3.


	NO

Go to step 2.

Problem verification-at test-driving:

Problem verification-at test-driving

?1.

Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:

	ENGINE SPEED
	VEHICLE SPEED
	MAP SENSOR
	TP SENSOR
	APP sensor
	ECT SENSOR 1
	IAT SENSOR

Signal	Current conditions
Signal	Values	Unit
ENGINE SPEED
VEHICLE SPEED
MAP SENSOR
TP SENSOR
APP SENSOR
ECT SENSOR 1
IAT SENSOR (2)

?2.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0088 Fuel Rail Pressure Too High

Is DTC P0088 indicated?


	YES

Go to step 3.


	NO

Intermittent failure, the system is OK at this time. Check for a poor connection or loose terminals at the fuel rail pressure sensor, the high pressure fuel pump, and the PCM.?

Fuel rail pressure sensor check 1:

Fuel rail pressure sensor check 1

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Remove PGM-FI main relay 2 (A) from the under-dash fuse/relay box.

?3.	Start the engine, and let it idle until it stalls.

?4.	After the engine stalls, press the accelerator pedal to the floor and crank the engine for several times.

?5.

Check the parameter(s) below with the HDS.

Signal	Current conditions
Signal	Values	Unit
FUEL PRESSURE CONVERTED FROM PF SENSOR

Does the value change to about 100 kpa?


	YES

Go to step 4.


	NO

Replace the fuel rail (fuel rail pressure sensor), then do the repair verification.

Fuel rail pressure sensor check 2:

Fuel rail pressure sensor check 2

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Install PGM-FI main relay 2.

?3.	Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?4.	A/T: Shift to D while pressing brake pedal firmly, then press the accelerator pedal. NOTE: Do not move the shift lever or remove your foot off the brake, while raising the engine speed. M/T: Snap the throttle for several times.

?5.

Check the parameter(s) below with the HDS.

NOTE: For M/T, use the Line Graph Setup mode with the HDS to compare the values.

Signal	Current conditions
Signal	Values	Unit
FUEL PRESSURE CONVERTED FROM PF SENSOR
FUEL PRESSURE DIRECT INJECTION SYSTEM
RELIEF VALVE

Are both values almost the same, and does the RELIEF VALVE indicate CLOSE?


	YES

The fuel rail pressure sensor is OK. Go to step 5.


	NO (the values are not the same)

Replace the fuel rail (fuel rail pressure sensor), then do the repair verification.


	NO (OPEN is indicated)

Replace the high pressure fuel pump, then do the repair verification.

Fuel pressure check (low pressure side):

Fuel pressure check (low pressure side)

?1.	Check the fuel pressure.

Is the fuel pressure OK?


	YES

Replace the high pressure fuel pump, then do the repair verification.


	NO

Check the fuel supply system (low pressure side), then do the repair verification.

Repair verification:

?1.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.	Reset the PCM with the HDS.

?3.	Do the PCM idle learn procedure.

?4.	Select the DI FUEL PRESSURE TEST in the INSPECTION MENU with the HDS.

?5.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0088 Fuel Rail Pressure Too High

Is DTC P0088 indicated?


	YES

Check for poor connections or loose terminals at the fuel rail pressure sensor, the fuel rail pressure control valve, the fuel rail pressure regulator, and the PCM, then go to step 1.


	NO

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?