Protege DX L4-1.6L DOHC (2000)
Engine Control Module: Component Tests and General Diagnostics
Using an Oscilloscope (Reference)
NOTE:
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"INSPECTION USING AN OSCILLOSCOPE (REFERENCE)" is a general inspection for the following output devices.
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Fuel injector
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Purge solenoid valve
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PRC solenoid valve
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VTCS solenoid valve
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EGR boost sensor solenoid valve
Purpose
Using an oscilloscope, inspection such as a stuck solenoid valve is made possible without actually removing parts.
When normal
Counter electromotive voltage A, generated when the three-way solenoid valve or the fuel injector is turned off from on, shows irregular convergence
because induced electromotive voltage B, generated by the plunger return operation, is added to it.
When plunger stuck
When the plunger is stuck, pulse convergence is smooth because no induced electromotive voltage B is generated.
Using SST (104 Pin Breakout Box)
CAUTION: The PCM terminal voltages vary with change in measuring conditions and vehicle conditions. Always carry out a total inspection of the
input systems, output systems, and PCM to determine the cause of trouble. Otherwise, a wrong diagnosis will be made.
PCM Inspection Using the SST (104 Pin Breakout Box)
1. Disconnect the negative battery cable.
2. Disconnect the PCM connector.