Engine Fails to Crank

Engine fails to crank
If a PATS fault is detected, the LED will flash for 60 seconds at 4Hz with a 50% duty cycle. At the end of this period, the LED will flash a 2 digit code, this code is repeated 10 times. The meaning of this code along with the frequency of flashing is given in the accompanying table (as a general rule a fault code of 16 or less will cause the vehicle not to crank. Additionally, the Jaguar Approved Diagnostic System should be used to check the DTC stored in the IC.

The most regular occurrence for failing to crank is due to the park and neutral switches (gearshift not in park or neutral). The start circuit is as follows, low side of relay coil (Switched directly from the instrument cluster, if conditions correct), high side of relay of coil (from ignition start position through gearbox rotary start switches to relay).

Another likely cause maybe the CAN network is malfunctioning, (the CAN circuit is open/short). This means that the IC and ECM would be unable to communicate resulting in no challenge being performed to enable the ECM.

On US manual vehicles the addition of a clutch switch has been included in the starting circuit, this switch takes place of the park/neutral switch (auto transmission). The switch activates at end of travel (clutch fully depressed).