Inspection and verification (Freelander 2)

The best way to check the correct operation of the passive anti-theft system (PATS) is to check the LED (located in the center of the instrument panel). When the ignition is turned on (ON position), the LED should light for 3 seconds and then go out. This confirms the operability of all PATS functions (i.e. the electronic key matches the code stored in memory, the module polling sequence was successful, the EMS system is enabled).

The ignition does not turn on

Make sure the key is inserted correctly into the SCU and that the key matches the vehicle (if the key is not programmed or is from a different vehicle, the SCU will eject it). If the vehicle has an automatic transmission, the vehicle should be in Park (P), and if the vehicle has a manual transmission, the vehicle should be in Neutral.

Check that there is no open or short to ground in the circuit between the start button and the central fuse block (CJB).

Check that the CAN network is normal, i.e. there is no open or short circuit. Otherwise, the CJB, ECM and instrument cluster will not be able to communicate. Check these modules for the corresponding DTCs and refer to the corresponding DTC Index.

The engine will not start

The immobilizer status LED is displayed in the lower left corner of the instrument cluster. When the key is inserted into the SCU, the LED will turn on for 3 seconds and then turn off. If the vehicle is immobilizer protected (the remote control has failed the test), the LED will flash slowly (once every 2 seconds). In addition, the diagnostic trouble codes (DTCs) related to the CJB, instrument cluster, ECM and ABS module should be checked using the diagnostic system.



One of the possible causes of problems with starting the engine in a car with an automatic transmission is the switch being locked in the parking position.

Verify that there is no short or open in the engine start request circuit between the CJB and the ECM.

Check the starter relay circuit.

Check that the steering column lock (SCL) is functioning properly. When the key is inserted into the slot, the SCL should disengage and the steering wheel should turn freely.

Check that the CAN network is OK, i.e. there is no break or short circuit. Otherwise, the CJB, instrument cluster, ECM or ABS module will not be able to communicate and the modules will not request the immobilizer to be unlocked.

On vehicles with an automatic transmission, also check the CAN network between the CJB and the transmission control module (TCM). The CJB uses the "LockedInP" signal from the TCM to determine whether the transmission is in a position before authorizing the engine to start. The CJB uses format values of 0x01; if the CJB detects a value less than the specified value, no start permission is issued and the key is not ejected from the SCU.

In case of manual transmission, it is necessary to press the clutch pedal; check the CAN network between the CJB and the ECM to ensure that the clutch pedal is pressed (ClutchPedalSwitch75pct = TRUE and ClutchPedalPressed2 = True). The vehicle cannot be started until these signals are received.

On vehicles with automatic transmission, check the CAN network between the ABS module and the CJB. The CJB uses the "BrakePedalActive" signal to check if the brake pedal is depressed when issuing an engine start authorization. The CJB uses the value = TRUE. If the CJB does not receive this signal, the engine start authorization will not be granted.

The engine turns over but does not start

If the engine cranks, this means that the EMS has passed the test required for the CJB. If the test fails, the ECM will not turn on the starter relay. This can be verified by the LED on the left side of the instrument cluster, which should light for 3 seconds when the key is inserted, or by reading the DTCs related to the CJB or ECM.

In all cases of problems with starting the engine, you should first exclude the most obvious causes of the malfunction:
1. Check the power and grounding of all necessary modules.

The text of the article was taken from the website [www.LRman.ru]
2. Check other systems/functions for unusual behavior/operation.
3. Check for functions that are not operating normally.