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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P003100HO2S1 HTR (B1)
(HO2S heater control circuit low bank 1 sensor 1)
Diagnosis conditionEngine running at idle
Signal (terminal)A/F sensor 1 heater signal
ThresholdAn excessively low voltage signal is sent to ECM through the A/F sensor 1 heater
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 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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than between 11 V at idle.
: .
 
2.PERFORM DTC CONFIRMATION PROCEDURE
  1. Start 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