DTC P0088
DTC P0088 : Fuel Rail Pressure Too High
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016) .
- 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, P0205, P0206: No. 1-No. 6 cylinder injector(s)
P0351, P0352, P0353, P0354, P0355, P0356 : No. 1-No. 6 cylinder ignition coil(s)
P064A: High pressure fuel pump system malfunction
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0088 Fuel Rail Pressure Too High |
DTC (PGM-FI)
- Problem verification (idling)
-1. Record all freeze data and the 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. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
- 5. Select the DI FUEL PRESSURE TEST in the INSPECTION MENU with the HDS.
DI FUEL PRESSURE TEST
Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0088 Fuel Rail Pressure Too High DTC (PGM-FI)
Is DTC P0088 indicated?
YES
Go to step 3.
NO
Go to step 2.
- Problem verification (test-drive)
-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
Data List
Signal Current conditions 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 DTC (PGM-FI)
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. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- Fuel rail pressure sensor check 1
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Remove PGM-FI main relay 2 (A) from the driver's 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 Values Unit FUEL PRESSURE CONVERTED FROM PF SENSOR Does the value change to about 100 kPa?
YES
Go to step 4.
NO
- 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. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
- 4. 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 pedal, while raising the engine speed.
- 5. Check the parameter(s) below with the HDS.
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 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) .
NO (OPEN is indicated)
- Fuel pressure check (low pressure side)
-1. Check the fuel pressure.
Is the fuel pressure OK?
YES
Replace the high pressure fuel pump .
NO
Check the fuel supply system (low pressure side).