2010 ASTON MARTIN V8 VANTAGE p0402

AML EOBD System Operation Summary

Rory O’Curry Aston Martin Lagonda CONFIDENTIAL 1 May 2009
[email protected] AML EOBD Monitors 07 ROC.doc Page 13 of 43

Differential Pressure Feedback EGR System Monitor

Where a vacuum driven EGR valve is used on the base application, the EGR System Monitor will consist
of a series of electrical and functional tests for the various aspects of system operation. First, the
Differential Pressure Feedback EGR (DPFE) sensor input circuit is checked for out of range values (P1400
P1401). The Electronic Vacuum Regulator (EVR) output circuit is checked for opens and shorts (P1409).


EGR Electrical Check Operation:
DTCs P1400, P1401, P1409
Monitor execution continuous, during EGR monitor
Monitor Sequence none
Monitoring Duration 4 seconds to register a malfunction

Typical EGR electrical check entry conditions:
EGR system enabled

Typical EGR electrical check malfunction thresholds:
DPFE sensor outside voltage: > 4.96 volts, < 0.195 volts
EVR solenoid smart driver status indicates open/short



The differential pressure indicated by the DPFE sensor is also checked at idle with zero requested EGR
flow to perform the high flow check. If the differen tial pressure exceeds a calibratable limit, it indicates a
stuck open EGR valve or debris temporar ily lodged under the EGR valve seat (P0402).

EGR Stuck open Check Operation:
DTCs P0402
Monitor execution once per driving cycle
Monitor Sequence Done after P1400 and P1401 tests
Sensors OK CPS, ECT, IAT, MAF, MAP, TP
Monitoring Duration 10 seconds to register a malfunction

Typical EGR stuck open check entry conditions : Minimum Maximum
EVR Duty Cycle (EGR commanded off) 0% 0%
Engine RPM (after EGR enabled) at idle at idle

Typical EGR stuck open check malfunction thresholds:
DPFE sensor voltage at idle versus engine-off signal: > 0.6 volts

AML EOBD System Operation Summary

Rory O’Curry Aston Martin Lagonda CONFIDENTIAL 1 May 2009
[email protected] AML EOBD Monitors 07 ROC.doc Page 14 of 43
After the vehicle is started, during vehicle acceleration, the differential pressure indicated by the DPFE
sensor at zero EGR flow is checked to ensure that both hoses to the DPFE sensor are connected. Under
this condition, the differential pressure should be zer o. If the differential pressure indicated by the DPFE
sensor exceeds a maximum threshold or falls below a minimum threshold, an upstream or downstream
DPFE hose malfunction is indicated (P1405 P1406).

EGR Hose Check Operation:
DTCs P1405, P1406
Monitor execution once per driving cycle
Monitor Sequence Done after P0402 test
Sensors OK MAF, MAP
Monitoring Duration 2 seconds to register a malfunction

Typical EGR hose check entry conditions : Minimum Maximum
EVR duty Cycle (EGR commanded off) 0% 0%
Mass Air Flow 8 lb/min
Inferred exhaust back pressure 13 in H2O

Typical EGR hose check malfunction thresholds:
DPFE sensor voltage: < -7 in H2O, > 7 in H2O


After the vehicle has warmed up and normal EGR rates are being commanded by the PCM, the low flow
check is performed. Since the EGR system is a closed loop system, the EGR system will deliver the
requested EGR flow as long as it has the capacity to do so. If the EVR duty cycle is very high (greater
than 80% duty cycle), the differential pressure indicated by the DPFE sensor is evaluated to determine the
amount of EGR system restriction. If the differential pr essure is below a calibratable threshold, a low flow
malfunction in indicated (P0401).

EGR Flow Check Operation:
DTCs P0401
Monitor execution once per driving cycle
Monitor Sequence Done after P1405 and P1406 tests
Sensors OK CPS, ECT, IAT, MAF, MAP, TP
Monitoring Duration minimum 70 seconds to register a malfunction

Typical EGR flow check entry conditions: Minimum Maximum
EVR Duty Cycle 80% 100%
Engine RPM 2500 rpm
Mass Air Flow Rate of Change 6% prog. loop
Inferred manifold vacuum 6 in Hg 10 in Hg

Typical EGR flow check malfunction thresholds:
DPFE sensor voltage: < 6 in H2O

EGR Monitor temporary disablement conditions ( other than entry requirements ) :
Non-operational when base feature disabled, including matching base feature temperature disablement.
Low Barometric Pressure Conditions.
Reporting of faults suppressed below 32° F to prevent mis-diagnosis due to ice. Monitor is still operational
and continues to check, reporting any faults when temperature > 32 °F.

Aston Martin V8 Vantage 2009 MY EOBD DocumentationAston Martin/Ford Confidential
Component/ System Fault Code Monitor Strategy
Description Malfunction Criteria Threshold Parameter Secondary Parameters Entry Parameters Time Required DTC
StorageMIL Illumin-
ation
EGR duty cycle egrdc>0.2*100
EGR valve valve warm cumulative time with egr enabled > 40 seconds
Time with circuit
malfunction >2 seconds
Signal circuit voltage <0.049 (4.8kPa) 10*(5/1024)Ambient Temperature > -7c (20f)
Time with circuit
malfunction >2.5 seconds
Signal circuit voltage >4.956 (115.25kPa) 1015*(5/1024)Ambient Temperature > -7c (20f)
Time with circuit
malfunction >2.5 seconds
Pressure differential >
Pressure differential at
engine off + offset > 0.366 volts
75*(5/1024)
EGR valve warm cumulative time with egr
enabled > 40 seconds
Forced valve actuation
complete 2
P0403 test complete and
no fault
Time exceeding threshold >5 seconds P0405 test complete and
no fault
P0406 test complete and
no fault
Ambient Temperature > -7c (20f)
EGR valve commanded
shut >1.5seconds
In idle speed control
Low pressure differential egrdc>0.75*100
Time with fault >0.7*50 seconds Manifold vacuum > 20.3 kPa (6"Hg)
Ambient Temperature > -7c (20f)
Not in transient condition
(air charge rate of change) < 0.04 (lb/stk)
Engine speed <3000rpm
Air mass <60.47g/sec (8lb/min)
P0403 test complete and
no fault
P0405 test complete and
no fault
P0406 test complete and
no fault
P0402 test complete and
no fault
P0402 EGR
Excess Flow
Excessive pressure differential
across EGR orifice at idle
Electronic Vacuum
Regulator (EVR)
Electrical
P0403 Circuit Malfunction - Short to
Vbat PCM able to determine
failure
Footnote
c+f)
Footnote
c+f)
Footnote a) Footnote
c+f)
Continuous
Continuous Footnote a) Footnote
c+f)
Once per driving
cycle
Footnote a)ESM (EGR System Module) Exhaust Gas Recirculation Monitor
P0401 EGR
Restricted flowLow pressure differential
across EGR orifice with high
valve duty commanded Footnote a)
Once per driving
cycle
Pressure Differential
Sensor
P0405 Low
Input
P0406 Low
InputCircuit malfunction
Circuit malfunction
EGR Valve
Footnote
c+f)
Once per driving
cycle Footnote a)
5