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Oscilloscope testing
Ignition amplifier
Connect oscilloscope test probes between ignition amplifier ECM pin and earth.
Ensure engine is at normal operating temperature.
Start the engine and allow to idle.
The signal should show a digital DC voltage pulse.
Compare scope trace with wave form reference Fig. 29.
If the signal is satisfactory the amplitude, f requenid shape of each pulse should be closely matched.
Increase the engine speed and check that the signal frequency increases in proportion to the engine rpm.
Ignition coil - primary
Connect oscilloscope test probes between ignition coil ECM pin and earth.
Ensure engine is at normal operating temperature.
Start the engine and allow to idle.
Compare scope trace with wave form reference Fig. 30.
Positive voltage spikes should be of even amplitude.
Major differences of amplitude could indicate either a high resistance in the secondary circuit or a faulty spark plug or HT
lead (where applicable).
Electronic control modules
Without specialist equipment and data no testing of control modules is possible, except by self-diagnosis (if applicable) or
substitution.
Several companies operate a repair or exchange service for control modules and some offer a diagnosis service via a
modem link to an appointed agent.
However it is possible to check:
0 The signal inputs.
0 The signal outputs.
The wiring.
NOTE: Refer to Autodata Pin Data manual or CDZ for engine management system signal values.
NOTE: For information regarding control module self-diagnosis refer to model-specific chapter in this manual.
Fig. 29
1 T AM2133 )
IgnMon arnplsfler wave form
Fig. 30
T
Ignition coil wave form
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AD42123