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Diagnosis Procedure
noteTurning the ignition switch ON with FRP sensor harness connector disconnected causes ECM to detect DTC P0192 and P0193. Be sure to erase the DTC when the diagnosis procedure.
1.CHECK DTC PRIORITY
If DTC P0191 is displayed with DTC P06B0, first perform the trouble diagnosis for DTC P06B0.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Description.
.
 
2.CHECK FUEL RAIL PRESSURE (FRP) SENSOR POWER SUPPLY-1
  1. Turn ignition switch OFF.
  2. Disconnect FRP sensor harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between FRP sensor harness connector terminals.
    FRP sensorVoltage
    (Approx.)
    Connector+−
    Terminal
    F79315 V
Is inspection result normal?
.
.
 
3.CHECK FRP SENSOR POWER SUPPLY-2
Check the voltage between FRP sensor harness connector and ground.
+−Voltage
(Approx.)
FRP sensor
ConnectorTerminal
F793Ground5 V
Is inspection result normal?
.
.
 
4.CHECK FRP SENSOR POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between FRP sensor harness connector and ECM harness connector.
    FRP sensorECMContinuity
    ConnectorTerminalConnectorTerminal
    F793F5161Existed
  4. Also check harness for short to ground and short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
5.CHECK FRP SENSOR GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between FRP sensor harness connector and ECM harness connector.
    FRP sensorECMContinuity
    ConnectorTerminalConnectorTerminal
    F791F5141Existed
  4. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
6.CHECK ECM GROUND CIRCUIT
Check the continuity between ECM harness connector and the ground.
ECMGroundContinuity
ConnectorTerminal
F514GroundExisted
E16156
157
160
Is inspection result normal?
INSPECTION END
Repair or replace malfunctioning part.
 
7.CHECK FRP SENSOR SIGNSL CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between FRP sensor harness connector and ECM harness connector.
    FRP sensorECMContinuity
    ConnectorTerminalConnectorTerminal
    F792F5158Existed
  4. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace malfunctioning part.
 
8.CHECK FRP SENSOR
Check FRP sensor. Refer to Component Inspection.
Is the inspection result normal?
INSPECTION END
Replace FRP sensor. Refer to Exploded View.