Obd Ii Readiness Test Monitor - 97 My; Throttle Position Sensor Track Test - 97 My - Aston Martin DB7 Workshop Manual

The Aston Martin Lagonda Diagnostic System
Users Guide
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O B D I I Readiness Test Monitor - 9 7 M Y
SelectingOBD II Readiness Tests will bring up the following
screen.
OBDII Readiness Tests
1 of 9 tests completed.
Logged DTCs : 1
The following tests have been
identified as incomplete:
MISFIRE i r 1 C.C.M.
CAT MON 1IPURGE M O N I I S A I R M"ONn
02 SENS 1l02 HEAT II EGR M O N T I
@
This software monitors the status of all significant
components and parameters required to control vehicle
emissions. When the tests are satisfactorily completed, the
test boxes wi 1 1 be empty and the PI 000 status code wi 1 1 be
removed from the DTC list.
If any problem is detected, the tests will be terminated and
the status will be shown as on the screen above e.g.: 1 of
9 tests completed. Logged DTCs : 1
Incomplete test titles will remain in the screen boxes.
Completed test titles are deleted from the screen boxes.
Details of any trouble codes may be accessed using the
Diagnostic Trouble Code function.
The tests incorporated into this routine are as follows:
Misfire Monitoring
Fuel System Monitoring
Comprehensive Component Monitoring
Catalyst Monitoring
Purge System Monitor
Secondary Air Injection Monitor
Oxygen Sensor Monitor
Oxygen Sensor Heater Monitor
Exhaust Gas Recirculation Monitor
Throttle Position Sensor Track Test - 9 7 M Y
This test is used to detect any problems with the throttle
potentiometer track which could cause faulty throttle
position signals to enter the PCM. Such signals would
result in incorrect calculation of engine power demand
and possibly create excessive fuelling and high emissions.
Selecting Throttle Checks from the Engine Diagnostics
screen w i l l bring uptheThrottle Position Sensor Track Test
screen:
Throttle pot track test
Throttle State: PART
Value : 1.9V
ov
Throttle pot voltage
Depress The Throttle Slowly
5V
o
Follow the screen instructions to test the throttle position
sensor track. The throttle must be moved slowly from fu I ly
closed to fully open without hesitation. Any pause in
throttle movement w i l l be interpreted as a track fault.
If a fault is detected, repeat the test several times to
elliminate hesitant throttle movement errors from actual
potentiometer faults. If a repeatable fault is detected, the
potentiometer must be replaced.
9-34
September 1996