ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-160
(7) EGO Sensors ((Exhaust Gas Oxygen) Sensors) (DTC 134, 154)
DTC 134-EGO1 Open/Lazy (HO2S1)
• Hardware: Heated Exhaust Gas Oxygen Sensor (Pre-Catalyst)
• Enabling Conditions: Engine Running
• Set Conditions: HEGO/HO
2S cold or non-responsive for longer than 120 seconds
• Corrective Action(s): Illuminate MIL, disable closed loop operation and fuel adaptive learn correction (both) while
the code is active.
• Emissions related fault
• Possible Causes: Open feed circuit to O
2 heater, Open heater ground circuit, Open or shorted to ground O2 signal
wire, open sensor ground (5 Vrtn1), inoperative sensor
The HEGO/HO
2S sensor is a switching-type sensor about stoichiometry that measures the oxygen content
present in the exhaust to determine if the fuel flow to the engine is correct. If there is a deviation between the expected
reading and the actual reading, fuel flow is precisely adjusted using the Closed Loop multiplier and then "learned" with
the Adaptive multiplier. The multipliers only update when the system is in either "CL Active" or "CL + Adapt" control
modes.
Cold or non-responsive is defined as the actual impedance of the sensor heater not reaching the target
impedance.
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