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DTC P053F: Cold Start Fuel Rail Pressure Performance
 
 
 
 
TECHNICAL DESCRIPTION
The cause may mainly lie in abnormally low fuel pressure or high fuel pressure during the warm-up.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Fuel pump (high pressure) monitor
Sensor (The sensor below is determined to be normal)
  • Fuel rail pressure sensor
 
 
DTC SET CONDITIONS <Functional check - too low>
Logic Flow Chart
 
 
Check Conditions
  • More than 3 seconds have passed since the engine starting sequence was completed.
  • Battery positive voltage is higher than 10 volts.
  • The estimated fuel rail pressure subtracted from the fuel rail pressure sensor output equals lower than 0 kPa (0 in.Hg).
Judgment Criteria
  • The fuel rail pressure is lower than the specified value for 15 seconds.
  • Under the ignition timing retard control.
or
  • For 3 seconds, the estimated fuel rail pressure subtracted from the fuel rail pressure sensor output equals lower than the specified value.
  • Under the ignition timing retard control.
 
 
DTC SET CONDITIONS <Functional check - too high>
Logic Flow Chart
 
 
Check Conditions
  • More than 3 seconds have passed since the engine starting sequence was completed.
  • Battery positive voltage is higher than 10 volts.
  • Fuel injection mode is not MFI-mode.
  • The estimated fuel rail pressure subtracted from the fuel rail pressure sensor output equals 0 kPa (0 in.Hg) or higher.
Judgment Criteria
  • For 2 seconds, the estimated fuel rail pressure subtracted from the fuel rail pressure sensor output equals higher than the specified value.
  • Under the ignition timing retard control.
noteStop the monitor within 3 seconds of starting the DFI and MFI mode, or stop the monitor within 10 seconds of exceeding the fuel rail pressure of 20,000 kPa (5,906.7 in.Hg) in the DFI and MFI mode.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 6 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Fuel rail pressure sensor circuit harness damage, or connector damage.
  • Fuel pump (high pressure) circuit harness damage, or connector damage.
  • Fuel rail pressure sensor failed.
  • Fuel pump (high pressure) failed.
  • Fuel pump failed.
  • Fuel line failed.
  • Injector (high pressure) failed.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check freeze frame data (OBD) item 124: Fuel rail pressure sensor (Absolute).
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn the ignition switch to the "ON" position.
(3) Read the freeze frame data (OBD) of DTC P053F.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the fuel rail pressure between 10,000 and 13,000 kPa (2953.4 and 3839.3 in.Hg)?
Refer to DTC P0087 - Fuel System Pressure Too Low . If DTC P0087 is not abnormal, Refer to DTC P0088 - Fuel System Pressure Too High .
: Refer to DTC P0087 - Fuel System Pressure Too Low .
: Refer to DTC P0088 - Fuel System Pressure Too High .