Pre Heating

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.

Pre-heat is the length of time the glow plugs operate before engine cranking. The ECM controls the pre-heat time based on the ECT sensor signal. The pre-heat duration is extended if the coolant temperature is low.

When the drives presses the Stop/Start switch to turn on the ignition or crank the engine, the ECM calculates any required glow plug heating times and, if heating is required, signals the glow plug control module, which supplies power to the glow plugs. When pre heating is required, the ECM also sends a message to the IC, on the High Speed (HS) Controller Area Network (CAN) Powertrain Bus, to request illumination of the glow plug warning indicator. The glow plug warning indicator stays on for the duration of the pre heating phase, until the ECM cranks the engine. If required, the glow plug control module supplies power to the glow plugs during cranking and for the duration of any post heating phase.