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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P003000HO2S1 HTR (B1)
(HO2S heater control circuit bank 1 sensor 1)
Diagnosis conditionEngine running at idle
Signal (terminal)A/F sensor 1 heater signal
ThresholdVoltage signal transmitted from A/F sensor 1 heater to ECM is higher/lower than voltage in the normal range
Diagnosis delay time
 
 
POSSIBLE CAUSE
  • Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
  • The A/F sensor 1 heater
 
 
FAIL-SAFE
Not applicable
 
 
DTC CONFIRMATION PROCEDURE
1.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.
: .
 
2.PERFORM DTC CONFIRMATION PROCEDURE
  1. Start the engine and let it idle for at least 10 seconds.
  2. 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