Dosing Pump Open

Test 1:

Test 2 - 3:

Test 4:

SYMPTOM
DOSING PUMP OPEN

WHEN MONITORED
With the ignition on.

SET CONDITION
This DTC will set if the heater's control unit detects abnormally high voltage on the Dosing Pump control circuit.

POSSIBLE CAUSES
- Dosing pump control circuit shorted high
- Dosing pump
- Dosing pump control circuit open
- Ground circuit open
- Cabin heater or heater booster control unit