ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-167
DTC 1161-Adaptive Learn High (LPG)
DTC 1163-Adaptive Learn High (NG)
• Hardware: Heated or Universal Exhaust Gas Oxygen Sensor (Bank 1-Sensor 1/Bank 1-Before Catalyst)
• Enabling Conditions: Engine Running in closed loop and with fuel adaptive learn active
• Set Conditions: Adaptive fuel multiplier higher than 30 % for longer than 3 updates
• Corrective Action(s): Illuminate MIL
• Emissions related fault
• Possible Causes:
The HEGO/HO
2S sensor is a switching-type sensor around stoichiometry that measures the oxygen content
present in the exhaust to determine if the fuel flow to the engine is correct. A UEGO sensor measures the exhaust
content across a wide-range of air-fuel ratios with a linear output proportional to lambda/equivalence ratio/air-fuel
ratio. In either case, if there is a deviation between the expected reading and the actual reading, fuel flow is precisely
adjusted for each bank 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. The purpose of the
Adaptive Learn fuel multiplier is to adjust fuel flow due to variations in fuel composition, engine wear, engine-to-engine
build variances, and component degradation.
This fault sets if the Adaptive multiplier exceeds the high limit of normal operation indicating that the engine is
operating lean (excess oxygen) and requires more fuel than allowed by corrections. Often high positive fueling
corrections are a function of one or more of the following conditions: 1) exhaust leaks upstream or near the HEGO
sensor, 2) reduced fuel supply pressure to the gaseous fuel control system, 3) a fuel supply or manifold leak, 4) a
non-responsive HEGO/UEGO sensor, and/or 5) a defective gaseous fuel control component (actuator/valve and/or
mixer). This fault should be configured to disable adaptive learn for the remainder of the key-cycle to avoid improperly
learning the adaptive learn table and may be configured to disable closed loop.
DTC 1162-Adaptive Learn Low (LPG)
DTC 1164-Adaptive Learn Low (NG)
• Hardware: Heated or Universal Exhaust Gas Oxygen Sensor (Bank 1-Sensor 1/Bank 1-Before Catalyst)
• Enabling Conditions: Engine Running in closed loop and with fuel adaptive learn active
• Set Conditions: Adaptive fuel multiplier lower than 30 % for longer than 3 updates
• Corrective Action(s): Illuminate MIL
• Emissions related fault
• Possible Causes:
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