Dosing Pump Circuit: Open or Short to Battery

Test 1:

Test 2 - 3:

Test 4:

SYMPTOM
B1820 DOSING PUMP CIRCUIT: OPEN OR SHORT TO BATTERY

WHEN MONITORED
With the ignition on.

SET CONDITION
This DTC Will set if the DCHA Control detects no-load voltage on the Dosing Pump circuit output pin.


POSSIBLE CAUSES
- Dosing pump control circuit shorted high
- Dosing pump control circuit open
- Ground circuit open
- Dosing pump
- DCHA control unit fault