AML EOBD System Operation Summary
Rory O’Curry Aston Martin Lagonda CONFIDENTIAL 1 May 2009
[email protected] AML EOBD Monitors 07 ROC.doc Page 8 of 43
deviant accelerations of this type are considered noise. Noise-free deviant acceleration exceeding a given
threshold is labeled a misfire.
The number of misfires are counted over a continuous 200 revolution and 1000 (or 4000)
revolution period. (The revolution counters are not reset if the misfire monitor is temporarily disabled such
as for negative torque mode, etc.) At the end of the evaluation period, the total misfire rate and the misfire
rate for each individual cylinder is computed. The misfire rate evaluated every 200 revolution period
(Type A) and compared to a threshold value obtaine d from an engine speed/load table. This misfire
threshold is designed to prevent damage to the cat alyst due to sustained excessive temperature. If the
misfire threshold is exceeded and the catalyst temperature model calculates a catalyst mid-bed temperature
that exceeds the catalyst damage threshold, the MIL blinks at a 1 Hz rate while the misfire is present. If the
threshold is again exceeded on a subsequent driving cy cle, the MIL is illuminated. If a single cylinder is
indicated to be consistently misfiring in excess of the catalyst damage criteria, the fuel injector to that
cylinder may be shut off for a period of time to pr event catalyst damage. Up to two cylinders may be
disabled at the same time. This fuel shut-off feature is used on many 8-cylinder engines. It is never used
on a 4-cylinder or 6-cylinder engine. Next, the misf ire rate is evaluated every 1000 (or 4000) rev period
and compared to a single ( Type B ) threshold value to indicate an emission-threshold malfunction. If a
1000 rev period is calibrated, a single 1000 rev exceedence from startup or four subsequent 1000 rev
exceedences on a drive cycle after start-up is used as the malfunction criteria. If a 4000 rev period is
calibrated, a single 4000 rev exceedence is used to indicate an emission-threshold malfunction.
Misfire Monitor Operation :
DTCs P0300 to P0312, P316 ,P1309, P1310, P1311
Monitor execution Continuous, misfire rate calculated every 200 and 1000 or 4000 revs
Monitor Sequence none
Sensors OK CKP, CMP, ECT
Monitoring Duration Entire driving cycle ( see disablement conditions below )
Typical misfire monitor entry conditions Minimum Maximum
Time since engine start-up 5 seconds
Engine Coolant Temp 20 oF 250 oF
RPM Range idle as per Directive
Profile correction factors learned in KAM Yes
Misfire Monitor temporary disablement conditions ( other than entry requirements )
Closed throttle decels (negative torque, engine being driven)
Engine Torque Reduction Modes
Accessory load-state change (A/C, power steering)
EGR Monitor Flow Test
Typical misfire monitor malfunction thresholds :
Type A (catalyst damaging misfire rate) misfire rate is an rpm/load table ranging from 40% at idle to
4% at high rpm and loads.
Type B (emission threshold rate) 1% to 5%
SB-17-0298
February 2009 Page 1 of 5
SERVICE BULLETIN
To: All Dealers
For the attention of: Service Manager/After Sales Manager
Please copy to: The Dealer Principal
The Warranty Administrator
Aston Martin Technician(s)
The Parts Manager
Reference
SB-17-0298
Issued:
26 February 2009
Model: DBS, DB9, V8 and V12 Vantage
VIN Range: All
Subject: Headlamp Drying Out Procedure Page 1 of 5
Reason for this Service Bulletin
The headlamps of DBS, DB9, V8 and V12 Vantage models can get condensation on the inside surface of the lens.
If a customer complains that their vehicle has condensa tion in a headlamp, do the applicable procedure that
follows to remove the condensation.
Workshop Procedures
DBS and DB9 Vehicles
1. Turn the steering to get access to the headlamp access panel for the correct headlamp.
2. Lift the vehicle and make it safe.
3. Release the quarter-turn fastener and remove the
headlamp access panel (refer to Figure 1).
Figure 1
4. Remove the dip-beam bulb cover from the headlamp.
5. Install a battery vent tube (part number 1R12-372635-AA) (1) into the head lamp in the position shown in
Figure 2 and Figure 3.
Service Bulletin SB-17-0298
February 2009 Page 3 of 5
14. Install the headlamp access panel and turn the quarter turn fastener to attach it.
15. Lower the vehicle.
16. Adjust the steering to the straight forward position.
V8 and V12 Vantage Vehicles
1. Turn the steering to get access to the headlamp access panel for the correct headlamp.
2. Lift the vehicle and make it safe.
3. Release the quarter-turn fastener an d remove the headlamp access panel.
4. Remove the two screws (1) that attach the bulb
cover (2) to the headlamp (refer to Figure 6).
Figure 6
5. Remove the bulb cover from the headlamp.
6. Install a battery vent tube (1) into the headlamp in the position shown in Figure 7 and Figure 8.
Figure 7
Figure 8
Service Bulletin SB-17-0298
February 2009 Page 4 of 5
7. Attach an airline that has dry air, without oil to
the battery vent tube (refer to Figure 9)
CAUTION: MAKE SURE THAT THE
AIRLINE PRESSURE IS 2 BAR
OR LESS. IF YOU DO NOT,
DAMAGE TO THE HEADLAMP
CAN OCCUR.
Figure 9
8. Blow air through the headlamp until you can see no condensation on the lens.
9. Let the air flow for 20 minutes more.
10. Remove the vent tube from the headlamp then do steps 11 and 12 that follow quickly before more
moisture can get into the headlamp.
11. Install two silica gel bags into the headlamp
(refer to Figure 10 – right headlamp shown).
Figure 10
12. Install the bulb cover.
13. Install and tighten the two screws that attach the bulb cover.
14. Install the headlamp access panel and turn the quarter turn fastener to attach it.
15. Lower the vehicle.
16. Adjust the steering to the centre.
Part Data
Description Part Number Quantity
25g Silica Gel Bag (2 each pa ck) 9G43-37-11095-PK 2 per headlamp
Battery Vent Tube 1R12-372635-AA 1
