Obd Freeze Frame Data [Lf]; Obd On-Board System Readiness Test [Lf]; Obd Read/Clear Diagnostic Test Result [Lf]; Obd Parameter Identification (Pid) Access [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(2DC). If the problem is found in a second drive cycle too, the PCM judges that the system has failed, and
the DTC is stored.

OBD FREEZE FRAME DATA [LF]

• This is the technical data which indicates the engine condition at the time of the first malfunction. This
data will remain in the memory even if another emission-related DTC is stored, with the exception of Fuel
system or Misfire DTCs. Once freeze frame data for Fuel system or Misfire DTC is stored, it will overwrite
any previous data and the freeze frame will not be overwritten again.

OBD ON-BOARD SYSTEM READINESS TEST [LF]

• This shows the OBD systems operating status. If any monitor function is incomplete, WDS or equivalent
will identify which monitor function has not been completed. The Fuel system, Misfire and CCM are
continuous monitoring-type functions. The HO2S, EGR system and Catalyst will be monitored under drive
cycles. The OBD diagnostic system is initialized by performing the DTC cancellation procedure or
disconnecting the negative battery cable.

OBD READ/CLEAR DIAGNOSTIC TEST RESULT [LF]

• This retrieves all stored DTCs in the PCM and clears the on-board readiness test results, freeze frame
data, DTC and pending trouble code.
OBD PARAMETER IDENTIFICATION (PID) ACCESS
• The PID mode allows access to certain data values, analog and digital inputs and outputs, calculated
values and system status information. Since the PID values for output devices are the PCM internal data
values, inspect each device to identify which output devices are malfunctioning.

ON-BOARD DIAGNOSTIC TEST [LF]

DTC Reading Procedure

1. Perform the necessary vehicle preparation and visual inspection.
2. Connect the WDS or equivalent to the vehicle DLC-2 16-pin connector located in the driver
compartment.
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