Flame Out: Unstable Operation

Test 1 - 2:

Test 3 - 4:

Test 5:

SYMPTOM
B1801 FLAME OUT: UNSTABLE OPERATION

TEST NOTE
This symptom is diagnosed using the test 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.

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