Caution / Notice / Hint

HINT: 

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. PID Item/Simulation Item Used In Diagnosis 
   PID/DATA MONITOR ITEM TABLE
   
   

   Item	Definition	Unit	Condition/Specification
   Heated Exhaust Gas Oxygen Sensor Heater (bank 1 sensor 2)	HO2S heater operation status	OFF/ON	Ignition switched ON (engine off): Off Idle (after warm up): On
   	HO2S heater control duty value	%	Ignition switched ON (engine off): 0% Idle (after warm up): 41-48%
   Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 2)	HO2S voltage	V	Idle (after warm up): 0-1.0 V Deceleration fuel cut (accelerator pedal released from engine speed of 4000 rpm or more): Approx. 0 V

2. Intention of troubleshooting procedure 
   • Step 4-7
     • Perform an inspection of the HO2S signal line-related parts.
   • Step 8-9
     • Verify the condition of the HO2S installation and perform a unit inspection.
   • Step 10
     • Perform an exhaust system parts inspection.
   • Step 11
     • Perform an inspection of the engine compression.
   • Step 12
     • Perform an inspection of the HO2S heater.
   • Step 13-14
     • Verify that the primary malfunction is resolved and there are no other malfunctions.