[Previous][Next]
DTC Description
 
 
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the A/F sensors 1. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
SensorInput signal to ECMECM functionActuator
A/F sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel injection controlFuel injector
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P017200FUEL SYS-RICH-B1
(System too rich bank 1)
Diagnosis condition—
Signal (terminal)—
Threshold
  • Direct fuel injection system does not operate properly
  • The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • A/F sensor 1
  • Direct fuel injector
  • Exhaust gas leakage
  • Incorrect fuel pressure
  • Mass air flow sensor
 
 
FAIL-SAFE
Engine operating condition in fail-safe mode
Fail safe modeVehicle behavior
Traveling control modeAccelerator angle variation controlECM 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.
noteECM does not control the accelerator pedal releasing speed.
Combustion control modeIdle speed controlStops feedback control of idle speed and controls with specified speed.
Recovery speed control at deceleratingStops recovery speed control by the fuel cut at decelerating and controls with specified speed.
Idle neutral controlStops idle neutral control.
 
 
DTC Confirmation Procedure
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
: .
 
2.PERFORM DTC CONFIRMATION PROCEDURE-1
  1. Clear the mixture ratio self-learning value. Refer to DescriptionDescription.
  2. Start engine.
Is it difficult to start engine?
.
.
 
3.RESTART ENGINE
If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal.
noteWhen depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the engine. Do not depress accelerator pedal too much.
Does engine start?
Proceed to DTC Diagnosis Procedure
Check exhaust and intake air leak visually.
 
4.PERFORM DTC CONFIRMATION PROCEDURE-2
  1. Start engine and let it idle for at least 5 minutes.
  2. Check 1st trip DTC.
Is 1st trip DTC detected?
Proceed to DTC Diagnosis Procedure
.
 
5.PERFORM DTC CONFIRMATION PROCEDURE-3
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Start engine.
  3. Maintain the following conditions for at least 10 consecutive minutes.
    Hold the accelerator pedal as steady as possible.
    VHCL SPEED SE50 - 120 km/h (31 - 75 MPH)
    cautionAlways drive vehicle at a safe speed.
  4. 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