Operation CHARM
: Car repair manuals for everyone.
Home
>>
GMC Truck
>>
1989
>>
C 2500 Truck 2WD V6-262 4.3L
>>
Repair and Diagnosis
>>
Powertrain Management
>>
Computers and Control Systems
>>
Testing and Inspection
>>
Scan Tool Testing and Procedures
>>
Positions
>>
Exhaust
Exhaust
Indicates whether O2 sensor rich or lean operating condition. Normal displays are "RH" for rich indication and "LN" for lean indication.