Aston Martin diagnostic trouble code
P0340: Cylinder Identiï¬cation Sensor A Circuit (Bank 1)
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
- Electrical and control modules
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0340 means
Cylinder Identiï¬cation Sensor A Circuit (Bank 1)
DB9 preliminary diagnostic manual · section 2-82
Manufacturer fault-analysis procedure
Manual fault definition
P0340 - During self-test, a cylinder identification
(CID) sensor circuit failure was detected. Bank 1
P0345 - During self-test, a cylinder identification
(CID) sensor circuit failure was detected. Bank 2
(CID) sensor circuit failure was detected. Bank 1
P0345 - During self-test, a cylinder identification
(CID) sensor circuit failure was detected. Bank 2
Cautions and notes
CAUTION: This code may be generated in the
Primary or Secondary Powertrain Control Module
(PCM) Check that you are working on the correct
half of the engine.
Primary or Secondary Powertrain Control Module
(PCM) Check that you are working on the correct
half of the engine.
Test sequence and decision path
1. Connect the WDS or scan tool. Record all logged
DTCs. Complete the PCM reset procedure to
clear all logged DTCs.
2. Check the continuity from the cylinder identification sensor cable screen to chassis ground.
If any defect is identified in the screen continuity,
service as necessary, reset the PCM and retest.
If no defects are identified in the screen continuity, go to step 3.
3. Set the datalogger to monitor the cylinder identification signals (CID).
Start the engine. Whilst monitoring the sensor signals, increase engine revs to greater than 1500 for
10 seconds and allow it to return to idle speed.
Repeat this sequence twice more.
The sensor signal must show a regular pattern of
pulses, one pulse per two engine revolutions.
If the pulse pattern is irregular or has missing
pulses, go on to step 4.
If the pulse pattern is regular, the P0340 fault is
intermittent, go to the Intermittent Signal Procedure.
4. Install the PCM breakout box. Disconnect the cylinder identification sensor. Check continuity of
the signal line to PCM pin C0636-25 primary or
C2464-25 secondary. The line should measure
less than 5.0Ω. If a resistance higher than 5.0 Ω is
measured, repair or replace the wiring as necessary. If continuity meets specification, continue to
step 5.
5. Check the security of the cylinder identification
sensor physical mounting. If loose, secure and
retest. If the sensor is already secure, replace the
sensor and retest. If the fault continues, contact
Aston Martin Technical Support.
Open the corresponding manual page for wiring diagrams and figures
DTCs. Complete the PCM reset procedure to
clear all logged DTCs.
2. Check the continuity from the cylinder identification sensor cable screen to chassis ground.
If any defect is identified in the screen continuity,
service as necessary, reset the PCM and retest.
If no defects are identified in the screen continuity, go to step 3.
3. Set the datalogger to monitor the cylinder identification signals (CID).
Start the engine. Whilst monitoring the sensor signals, increase engine revs to greater than 1500 for
10 seconds and allow it to return to idle speed.
Repeat this sequence twice more.
The sensor signal must show a regular pattern of
pulses, one pulse per two engine revolutions.
If the pulse pattern is irregular or has missing
pulses, go on to step 4.
If the pulse pattern is regular, the P0340 fault is
intermittent, go to the Intermittent Signal Procedure.
4. Install the PCM breakout box. Disconnect the cylinder identification sensor. Check continuity of
the signal line to PCM pin C0636-25 primary or
C2464-25 secondary. The line should measure
less than 5.0Ω. If a resistance higher than 5.0 Ω is
measured, repair or replace the wiring as necessary. If continuity meets specification, continue to
step 5.
5. Check the security of the cylinder identification
sensor physical mounting. If loose, secure and
retest. If the sensor is already secure, replace the
sensor and retest. If the fault continues, contact
Aston Martin Technical Support.