Aston Martin diagnostic trouble code
P0443: Evaporative Emission System Purge Control Valve Circuit
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Emissions and EVAP
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0443 means
Evaporative Emission System Purge Control Valve Circuit
DB9 preliminary diagnostic manual · section 2-92
Manufacturer fault-analysis procedure
Manual fault definition
P0443 - This code indicates a failure in the VMV
solenoid circuit.
solenoid circuit.
Cautions and notes
CAUTION: This code will be generated only in
the Primary Powertrain Control Module (PCM).
Check that you are working on the correct half of
the engine.
the Primary Powertrain Control Module (PCM).
Check that you are working on the correct half of
the engine.
Test sequence and decision path
1. Key off. Disconnect the VMV. Key on, engine off.
Measure the voltage between VBatt at the VMV
connector pin 1 and battery ground.
The voltage must be greater than 10.5 volts.
If the voltage is above 10.5 volts, go to step 2.
If the voltage is below 10.5 volts, repair the VBatt
circuit, complete a PCM reset and rerun the
KOER Test to verify that the problem is cleared.
2. Key off. Measure the resistance of the VMV.
If the resistance is in range, 30-90
Ω
, go to step 3.
If the resistance is outside the range 30-90
Ω
,
replace the vapour management valve. Reset the
PCM and rerun the KOER Test to verify that the
problem is cleared.
3. Check for open circuits in the VMV signal line:
Key off. Disconnect the PCM and VMV solenoid.
Install the break-out box to the PCM harness connector. Check continuity between primary PCM
connector pin C0635-34 and the VMV signal line
at the solenoid connector pin 2.
If an open circuit is detected, repair it. Reset the
PCM and rerun the KOER to verify that the problem is cleared.
If no open circuit is found, go to step 4.
4. Check for short circuits in the VMV signal lines:
Measure the resistance between PCM connector
pins C0635-34 primary or C0638-34 secondary
and chassis ground.
The resistance must be greater than 10k
Ω
.
If a resistance lower than 10k
Ω
is measured,
repair the short circuit between the VMV signal
line and GND. Reset the PCM and rerun the
KOER Test to verify that the problem is cleared.
If the resistance is greater than 10k
Ω
, the fault lies
in the PCM. Contact Aston Martin Technical Support.
Open the corresponding manual page for wiring diagrams and figures
Measure the voltage between VBatt at the VMV
connector pin 1 and battery ground.
The voltage must be greater than 10.5 volts.
If the voltage is above 10.5 volts, go to step 2.
If the voltage is below 10.5 volts, repair the VBatt
circuit, complete a PCM reset and rerun the
KOER Test to verify that the problem is cleared.
2. Key off. Measure the resistance of the VMV.
If the resistance is in range, 30-90
Ω
, go to step 3.
If the resistance is outside the range 30-90
Ω
,
replace the vapour management valve. Reset the
PCM and rerun the KOER Test to verify that the
problem is cleared.
3. Check for open circuits in the VMV signal line:
Key off. Disconnect the PCM and VMV solenoid.
Install the break-out box to the PCM harness connector. Check continuity between primary PCM
connector pin C0635-34 and the VMV signal line
at the solenoid connector pin 2.
If an open circuit is detected, repair it. Reset the
PCM and rerun the KOER to verify that the problem is cleared.
If no open circuit is found, go to step 4.
4. Check for short circuits in the VMV signal lines:
Measure the resistance between PCM connector
pins C0635-34 primary or C0638-34 secondary
and chassis ground.
The resistance must be greater than 10k
Ω
.
If a resistance lower than 10k
Ω
is measured,
repair the short circuit between the VMV signal
line and GND. Reset the PCM and rerun the
KOER Test to verify that the problem is cleared.
If the resistance is greater than 10k
Ω
, the fault lies
in the PCM. Contact Aston Martin Technical Support.