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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P209700POST CATALYST FUEL TRIM SYS B1
(Post catalyst fuel trim system too rich bank 1)
Diagnosis condition—
Signal (terminal)Air fuel ratio (A/F) sensor signal
ThresholdThe A/F signal computed by ECM from the A/F sensor 1 signal is shifts to the rich side for a specified period
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • A/F sensor 1
  • A/F sensor 1 heater
  • Heated oxygen sensor 2
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
  • Exhaust gas leaks
 
 
FAIL-SAFE
Not applicable
 
 
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 least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 at idle.
: .
 
2.PERFORM DTC CONFIRMATION PROCEDURE
  1. Clear the mixture ratio self-learning value. Refer to Work Procedure.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
  4. Let engine idle for 1 minute.
  5. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
  6. 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