Contents: List of displayed items ⤓ Ready to test status ⤓ Emergency Operation Reference Table ⤓ Emergency Operation Reference Table…⤓
When the engine control module (vehicles with manual transmission) or the engine and automatic transmission control module (vehicles with automatic transmission) detects a malfunction and stores a diagnostic trouble code (DTC), it also stores the current engine status.
This function is called "freeze frame" ("FREEZE FRAME"). By analyzing the freeze frame data with the MUT-II, it is possible to conduct effective troubleshooting. The displayed positions of the freeze frame data are shown in the table below.
List of displayed items
Note: If multiple faults are detected in multiple systems, only the fault that was detected first is remembered.
Ready to test status
The electronic engine control unit monitors, evaluates the condition (serviceable/malfunctioning) and remembers the dynamics of changes in the technical condition of the main diagnostic elements listed below.
The dynamics of changes in the technical condition can be read by the MUT-II device (if the electronic control unit has already saved information about the technical condition of some element before, the MUT-II displays "Complete").
Finally, if the diagnostic trouble codes are erased, or if the battery is disconnected, the information about the technical condition of the element is also erased (the memory of the electronic control unit is reset).
- catalytic converter: P0421
- oxygen concentration sensor: P0130
- oxygen sensor heater: P0135, P0141.
Emergency Operation Reference Table
When the self-diagnosis system detects a malfunction of one of the main sensors, the system switches to emergency control mode so that the car can continue driving (to the service station).
Emergency Operation Reference Table (continued)
Fig. 7.3. Location of MPI fuel system components in a vehicle: A - ignition coil; B - misfire detection sensor, camshaft position sensor; C - crankshaft position sensor; D - Front oxygen concentration sensor; E - rear oxygen concentration sensor