DTC Description

DTC DETECTION LOGIC

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P0191	00	FRP SENSOR A (Fuel rail pressure sensor “A” circuit range/performance)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	Fuel rail pressure sensor signal
			Threshold	Fuel rail pressure remains at more than 14.5 MPa (147.9 kg/cm², 21025 psi)
			Diagnosis delay time	0.2 seconds or more

POSSIBLE CAUSE

Harness or connectors
- Fuel rail pressure sensor circuit is open or shorted.
- Sensor power supply 1 is shorted.
Fuel rail pressure sensor
Each sensor, connected with sensor power supply 1 circuit

FAIL-SAFE

Engine operating condition in fail-safe mode

Fail safe mode

Vehicle behavior

Traveling control mode

Accelerator angle variation control

ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction.

note	ECM does not control the accelerator pedal releasing speed.

Combustion control mode

Stratified charge combustion control at starting

No stratified charge combustion at starting (cold start).

DTC Confirmation 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 DTC PRIORITY

DTC P0191 is displayed with DTCs related to crankshaft position sensor, first perform the trouble diagnosis of DTCs.

Is applicable DTC detected?

Perform diagnosis of applicable.

3.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
Before performing the following procedure, check that the fuel tank is less than 1/8 full of fuel.

4.PERFORM DTC CONFIRMATION PROCEDURE

Start the engine and warm it up to the normal operating temperature.
note Warm up the engine until “COOLANT TEMP/S” in “DATA MONITOR” mode in “ENGINE” of M.U.T.-III SE reaches at least 70°C (158°F).
Turn the ignition switch OFF and cool the engine until the engine coolant temperature reaches 35°C (95°F) or less.
caution
The difference between air temperature and engine coolant temperature must be 5°C (9°F) or less.
Never turn ignition switch ON.
Turn ignition switch ON and wait at least 60 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END