Diesel OBD II Monitors And Readiness Status: Overview

WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The engine management system uses a number of monitors to check for fault conditions. Any detected faults are reported through DTC s. In order for the complete range of monitors to run, the engine must be operated at various speeds, loads, temperatures, etc.

Each group of monitors has a readiness status. When the readiness status is 'Complete' (or 'Set'), the necessary operating conditions to run every monitor in the group have been achieved. When the readiness status is 'Incomplete', the necessary operating conditions have not been achieved and this means that one or more undetected faults may be present.

The readiness status of each group of monitors will change to 'Incomplete' after the following events:

Disconnecting/reconnecting the vehicle battery.
Clearing the DTC s.
Re-configuring the powertrain control module.
Installing a new powertrain control module.

A vehicle may fail the state Inspection and Maintenance (I/M) test if one or more of the readiness status is 'Incomplete'.

Each readiness status will achieve 'Complete' status automatically during normal driving but this may take some time and distance.

A vehicle may fail the state Inspection and Maintenance (I/M) test if one or more of the readiness status is 'Incomplete'.