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DTC P0192: Fuel Rail Pressure Circuit Low Input
 
 
 
 
CIRCUIT OPERATION
  • A 5-volts voltage is supplied to the fuel rail pressure sensor power terminal from the ECM terminal HFP5. The ground terminal is grounded with ECM terminal HFPG.
  • The sensor signal is inputted to the ECM connector terminal HFPS from the fuel rail pressure sensor output terminal.
 
 
TECHNICAL DESCRIPTION
The fuel rail pressure sensor detects a change in fuel pressure and inputs the signal to the ECM.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • Fuel rail pressure sensor output voltage is out of specified range.
 
 
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)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • 2 seconds or more have passed since the engine starting sequence was completed.
  • Battery positive voltage is higher than 6 volts.
Judgment Criterion
  • Fuel rail pressure sensor output voltage is less than 0.2 volt for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • While prohibiting the operation of the injector (high pressure), carry out the control by the injector operation only.
  • Torque is restricted.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Fuel rail pressure sensor failed.
  • Shorted fuel rail pressure sensor circuit, or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check data list 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) Start the engine.
(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 124, Fuel Rail Pressure Sensor (Absolute).
(4) Warm up the engine.
  • When the engine is idling, 4,000 - 21,000 kPa (1,181.4 - 6,202.0 in.Hg).
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Measure the sensor supply voltage at fuel rail pressure sensor connector.
(1) Disconnect the connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal HFP5 line and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of short circuit to ground in HFP5 line between fuel rail pressure sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check data list item 124: Fuel Rail Pressure Sensor (Absolute).
(1) Start the engine.
(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 124, Fuel Rail Pressure Sensor (Absolute).
(3) Warm up the engine.
  • When the engine is idling, 4,000 - 21,000 kPa (1,181.4 - 6,202.0 in.Hg).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the ECM (Refer to Removal and Installation ). Then go to Step 8.
 
STEP 5. Measure the voltage at fuel rail pressure sensor connector.
(1) Disconnect the connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal HFPS line and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of short circuit to ground in HFPS line between fuel rail pressure sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 7. Using scan tool (M.U.T.-IIISE), check data list item 124: Fuel Rail Pressure Sensor (Absolute).
(1) Start the engine.
(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 124, Fuel Rail Pressure Sensor (Absolute).
(3) Warm up the engine.
  • When the engine is idling, 4,000 - 21,000 kPa (1,181.4 - 6,202.0 in.Hg).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the fuel rail (high pressure) (integrated with fuel rail pressure sensor). Then go to Step 8.
 
STEP 8. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0192 set?
Retry the troubleshooting.
The inspection is complete.