Finding Unusual Signals

While referring to the diagnostic trouble code inspection section of the workshop manual, use the PID monitor to check the input signal system relating to the problem.
(1) Turn the ignition to ON and idle the vehicle. You can assume that any signals that are out of specifications by a wide margin are unusual.
(2) When recreating the problem, any sudden change in monitor input signals that is not consciously created by the driver can be judged as unusual.