Aston Martin diagnostic trouble code
P0190: Fuel Rail Pressure Sensor Midrange Fault
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
- Fuel and air
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0190 means
Fuel Rail Pressure Sensor Midrange Fault
DB9 preliminary diagnostic manual · section 2-54
Manufacturer fault-analysis procedure
Manual fault definition
P0190 - Fuel rail pressure - mid range fault
Cautions and notes
CAUTION: These codes may be generated in the
Primary or Secondary Powertrain Control Module
(PCM) Check that you are working on the correct
half of the engine.
NOTE: Target pressure is increased in hot
conditions
).
Primary or Secondary Powertrain Control Module
(PCM) Check that you are working on the correct
half of the engine.
NOTE: Target pressure is increased in hot
conditions
).
Test sequence and decision path
1. Connect the WDS or scan tool. Confirm that a
code P0190 is logged.
If any of P1233, P1235 or P1237 (fuel pump drive
module faults) are logged, resolve these codes
first and return to this procedure only if a P0190
is logged again after clearing any P1233 - 1237
faults
2. Set datalogger to monitor fuel pressure on both
fuel rails. Start the engine. Monitor the fuel pressure readings from both sensors whilst varying the
engine speed within the range 1000 - 2500 rpm.
The fuel system must be capable of maintaining
39-41 psi above manifold pressure in both fuel
rails (
3. If either fuel pressure reading is significantly out
of specification, substitute a good sensor and
repeat the pressure test.
4. If the pressure readings are still significantly different, service the sensor wiring to eliminate poor
connections. Clear the fault code.
5. Run another KOER test. If the fault returns, install
the break-out box.
Check the fuel pressure signals with the WDS
scope, if the signal is noisy resolve the source of
electrical noise.
6. Clear the P0190 code. Run another KOER test. If
the P0190 code returns, replace the PCMs and
run a further test to ensure that the problem is
resolved.
Open the corresponding manual page for wiring diagrams and figures
code P0190 is logged.
If any of P1233, P1235 or P1237 (fuel pump drive
module faults) are logged, resolve these codes
first and return to this procedure only if a P0190
is logged again after clearing any P1233 - 1237
faults
2. Set datalogger to monitor fuel pressure on both
fuel rails. Start the engine. Monitor the fuel pressure readings from both sensors whilst varying the
engine speed within the range 1000 - 2500 rpm.
The fuel system must be capable of maintaining
39-41 psi above manifold pressure in both fuel
rails (
3. If either fuel pressure reading is significantly out
of specification, substitute a good sensor and
repeat the pressure test.
4. If the pressure readings are still significantly different, service the sensor wiring to eliminate poor
connections. Clear the fault code.
5. Run another KOER test. If the fault returns, install
the break-out box.
Check the fuel pressure signals with the WDS
scope, if the signal is noisy resolve the source of
electrical noise.
6. Clear the P0190 code. Run another KOER test. If
the P0190 code returns, replace the PCMs and
run a further test to ensure that the problem is
resolved.