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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P003700HO2S2 HTR (B1)
(HO2S heater control circuit low bank 1 sensor 2)
Diagnosis condition—
Signal (terminal)Heated oxygen sensor 2 heater signal
Threshold
  • An excessively low voltage signal is sent to ECM through the heated oxygen sensor 2 heater
  • ECM detects the heated oxygen sensor 2 heater circuit is short to ground.
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)
  • Heated oxygen sensor 2 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 11 V at idle.
: .
 
2.PERFORM DTC CONFIRMATION PROCEDURE
With M.U.T.-III SE
  1. Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
  2. Start engine and warm it up to normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
  5. Let engine idle for 1 minute.
  6. Check 1st trip DTC.
 
With GST
Follow the procedure “With M.U.T.-III SE” above.
 
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