DTC B1D34-66: Heater In Lock Out Mode - Signal has too many transitions/events: Action
NOTE:
- This DTC is set when the fuel fired booster heater repeatedly fails to operate
- If additional fuel fired booster heater related DTCs are also set, perform the relevant corrective action(s) first
- Check the fuel fired booster heater fuel pipe for blockages/leaks and replace as required
- If the fuel fired booster heater fuel pipe is replaced then, using JLR approved diagnostic equipment, clear the DTCs and perform routine - Fuel Priming (0x9009)
- Check the fuel fired booster heater exhaust for blockages and rectify as required
- Using JLR approved diagnostic equipment, clear the DTCs and perform routine - Auxiliary Heater (AHCM) Activation Test (0x900A). This will operate the fuel fired booster heater for 15 minutes. Note that the routine should be started only when the engine is cool. The routine should be performed with the engine running and with the climate controls set to maximum heat and maximum fan. Repeat the routine again if smoke continues to be visible from the fuel fired booster heater exhaust pipe or from the area surrounding the fuel fired booster heater
- If a fuel fired booster heater fault persists, replace the fuel fired booster heater combustion tube and evaporator assembly, clear the DTCs and perform routine - Auxiliary Heater (AHCM) Activation Test (0x900A)
- If the fault persists, install a new fuel fired booster heater, clear the DTCs and perform routine - Auxiliary Heater (AHCM) Activation Test (0x900A)