B1800

Test 1 - 2:

Test 3 - 4:

Test 5:

SYMPTOM
B1800 NO START

WHEN MONITORED
After DCHA activation.

SET CONDITION
This DTC will set if the Flame Sensor resistance is not within the expected parameters 160 seconds after activation.

POSSIBLE CAUSES
- Low fuel level in vehicle's fuel tank
- Dosing pump inoperable, no dosing pump DTCs set
- DCHA fuel line restricted/leaking/damaged
- Dosing pump
- DCHA air intake/exhaust restricted
- DCHA heater module fault