5. Closed Loop – Fault with at least one oxygen sensor. May be using single oxygen
sensor for fuel control.
NOTE: Fuel systems do not normally refer to injector banks. Fuel systems are intended to
represent completely different fuel systems that can independently enter and exit closed
loop fuel. Banks of injectors on a V-engine are generally not independent and share the
same closed-loop enablement criteria.
Power Take Off
A power take-off (PTO) is a splined driveshaft, usually on a tractor or truck that can be
used to provide power to an attachment or separate machine. It is designed to be easily
connected and disconnected. If your vehicle is not a truck or tractor equipped with PTO,
you can safely ignore the PTO status.
Commanded Secondary Air
The commanded secondary air is an emission control system that forces fresh air into the
exhaust system to accelerate catalyst operation. This reduces hydrocarbon and carbon
monoxide emission levels. ProScan will report one of the following three states:
1. Upstream of first catalytic converter.
2. Downstream of first catalytic converter inlet.
3. Atmosphere / Off
Vehicle OBD Requirements
The Vehicle OBD Requirements section defines the OBD requirements to which the
vehicle was designed. All vehicles will use report one of the following:
OBD II (California ARB)
OBD I
EOBD
EOBD, OBD, and OBD II
JOBD and EOBD
OBD (Federal EPA)
Not OBD Compliant
EOBD and OBD
JOBD
JOBD, EOBD, and OBD-II
OBD and OBD II
EOBD
EOBD and OBD II
JOBD and OBD II
Oxygen Sensor Locations
The Oxygen Sensor Locations section informs you of the number of oxygen sensors
being used by your vehicle as well as where they are located on the exhaust system. See
the “Oxygen Sensor and Catalyst Configuration Examples” section of this manual for
more information on oxygen sensor locations.
Battery Voltage
This section displays the current battery voltage. ELM327-based hardware is required.
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