DTC Troubleshooting: P0088
DTC P0088: Fuel Rail Pressure Too High
NOTE:
Before you troubleshoot, 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)
P219C, P219D, P219E, P219F: No. 1?No. 4 cylinder A/F variation
P2623: High pressure fuel pump

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

1.
Problem verification (idling):

Problem verification (idling)
?1.
Record on-board snapshots with the HDS.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine.

?5.
Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?6.
Select the DI Fuel Pressure Test in the INSPECTION MENU with the HDS.

  

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0088 Fuel Rail Pressure Too High
   

Is DTC P0088 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
Go to step 2.
2.
Problem verification (test-drive):

Problem verification (test-drive)
?1.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
ENGINE SPEED
VEHICLE SPEED
MAP SENSOR
TP SENSOR
APP SENSOR
ECT SENSOR 1
FUEL PRESSURE CONVERTED FROM PF SENSOR
FUEL PRESSURE DIRECT INJECTION SYSTEM
IAT SENSOR (1)
Signal
Current conditions
Values
Unit
ENGINE SPEED
    
VEHICLE SPEED
    
MAP SENSOR
    
TP SENSOR
    
APP SENSOR
    
ECT SENSOR 1
    
FUEL PRESSURE CONVERTED FROM PF SENSOR
    
FUEL PRESSURE DIRECT INJECTION SYSTEM
    
IAT SENSOR (1)
    

?2.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0088 Fuel Rail Pressure Too High
   

Is DTC P0088 indicated?

     
YES
     
     
     
The failure is duplicated. 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. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
3.
Fuel rail pressure sensor check 1:

Fuel rail pressure sensor check 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove PGM-FI main relay 2.

?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 several times.

?5.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
FUEL PRESSURE CONVERTED FROM PF SENSOR
Less than 1,000
kPa
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
4.
Fuel rail pressure sensor check 2:

Fuel rail pressure sensor check 2
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Install PGM-FI main relay 2.

?3.
Start the engine.

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

?5.
CVT: Shift the transmission to D position/mode while pressing the brake pedal firmly, then press the accelerator pedal.
NOTE: Do not shift the transmission or remove your foot off the brake pedal, while raising the engine speed.
M/T: Snap the throttle for several times.

?6.
Check the parameter(s) below with the HDS.
NOTE: For M/T: use the Line Graph Setup mode with the HDS to compare the value.

Signal
Current conditions
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 Normal?

     
YES
     
     
     
The fuel rail pressure sensor is OK. Go to step 5.
     
NO (the values are not the same)
     
     
     
     
NO (Abnormal is indicated)
     
     
     
5.
Fuel pressure check (low pressure side):

Fuel pressure check (low pressure side)
?1.
Check the fuel pressure.

Is the fuel pressure OK?

     
YES
     
     
     
     
NO
     
     
     
Check the fuel supply system (low pressure side).?