Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
2-22 Diagnostic Methods
Freeze Frame Data
FREEZE FRAME DATA TABLE (Continued)
Acronym | Description | Measurement Units |
|---|---|---|
TAC_ PCT | Commanded Throttle Actuator | % |
TP | Absolute Throttle Position | % |
TP_REL | Relative Throttle Position | % |
VS | Vehicle Speed | km/h-mph |
WARMUPS | Number Of Warmups Since Code Cleared | Units |
Some unique PIDs are stored in the keep alive memory (KAM) of the PCM to help in diagnosing the root cause of misfires. These PIDs are collectively called misfire freeze frame (MFF) data. These parameters are separate from the generic freeze frame data stored for every MIL code and are used for misfire diagnosis only. The MFF data could be more useful for misfire diagnosis than the generic freeze frame data. It is captured at the time of the highest misfire rate, not when the DTC is stored at the end of a 200 or 1,000 revolution block (generic freeze frame data for misfire can be stored minutes after the misfire actually occurred).
The MFF PIDs are supported on all vehicles, but may not be available on all scan tools because enhanced PID access may vary by scan tool manufacturer.
MISFIRE FREEZE FRAME PIDS
PID Name | Description | Measurement Units |
|---|---|---|
MFF_EGR | EGR DPFE Sensor At The Time Of Misfire | Volts |
MFF_IAT | Intake Air Temperature At The Time Of Misfire | Degrees |
MFF_INGEAR | Transmission In Gear At The Time Of Misfire | Yes/No |
MFF_LOAD | Engine Load At The Time Of Misfire | % |
MFF_PNP | Park/Neutral Position At The Time Of Misfire | Mode |
MFF_RNTM | Engine Running Time At The Time Of Misfire | Time |
MFF_RPM | Engine RPM At The Time Of Misfire | RPM |
MFF_RUN | Engine Running Time At The Time Of Misfire | Time |
MFF_SOAK | Engine Off Soak Time At The Time Of Misfire | Time |
MFF_TCC_ LOCK | Torque Converter Clutch At The Time Of Misfire | Yes/No |
MFF_THR_ ANG | Throttle Angle At The Time Of Misfire | % |
MFF_TP | Throttle Position At The Time Of Misfire | Volts |
MFF_TRIP | Number Of Driving Cycles At The Time Of Misfire (At Least One 1,000 Rev Block) | Number of Trips |
MFF_VSS | Vehicle Speed At The Time Of Misfire | km/h-mph |
MP_ LRN | Learned Misfire Correction Profile | Yes/No |
Manufacturer Specific Freeze Frame
The manufacturer specific freeze frame data is DTC snapshot data that allows a manufacturer to store vehicle condition information when a DTC sets. This is similar to the OBDII freeze frame functionality that already exists in the PCM. The manufacturer defines the snapshot data to provide the conditions at the time when a fault occurred. Each snapshot is about 40 - 50 PIDs with up to 5 snapshots available for up to 5 different DTCs. The PCM reports the most recent fault conditions for the DTC, and refreshes a maximum of once per operation cycle.
MANUFACTURER SPECIFIC FREEZE FRAME PIDS
PID Name | Description | Measurement Units |
|---|---|---|
APP1 | Accelerator Pedal Position Sensor 1 | Volts |
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.