Safety Precautions
Check for Technical Bulletins that may supersede any
information included in this manual.
WARNING
Failure to follow these instructions may result in
personal injury or po
On Board Diagnostics, or OBD, is an automotive term
referring to a vehicle's self-diagnostic and reporting
capability. OBD systems give the vehicle owner or repair
technician access to the status o
Ignition
A spark ignition (SI) engine requires a spark to initiate
combustion in the combustion chamber. Voltage is supplied to the
spark plug where the electricity will arc across a gap at a
voltage as high as 100 kilovolts. The ECM determines the precise
moment to fire each spark plug using ig
The Battery -A- can also be checked using the Vehicle
Diagnostic Tester when it is installed and without being
connected to a battery charger.
Special tools and workshop equipment
required
Vehicle Diagnostic Tester
Test Prerequisites
No battery charger connected
Battery -A- is connected.
B
General Information
