Colt Vista FWD L4-1795cc 1.8L SOHC (1994)
Ignition Relay: Testing and Inspection
Ignition Coil And Power Transistor
Wave Pattern Inspection Using an Analyzer
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Ignition coil primary signal
Refer to GROUP 8-Ignition System
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Ignition power transistor control signal
Measurement method
1. Disconnect the ignition power transistor connector, and connect the special tool (test harness: MB991348) in between.
(All terminals should be connected.)
2. Connect the analyzer special patterns pickup to ignition power transistor unit connector terminal ®.
Alternate method (test harness not available)
1. Connect analyzer special patterns pickup to ECM terminals 10 for ignition power transistor.
Examples of abnormal wave patterns
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Example 1
Wave pattern during engine cranking
Cause of problem
Open-circuit in ignition primary circuit
Wave pattern characteristics
Top-right part of the build-up section cannot be seen, and voltage value is approximately 2V too low.
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Example 2
