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Where to go 700

posted by  jerryc on  Sat Jul 28 22:59 CST 2012
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last visit: Wed Oct 8 21:28 CST 2014
[RELATED]

lucid's start-run


Start-Run Sequence LH 2.2 Version

1) During starter cranking, the distributor Hall sensor sends timing pulses to Ignition Control Unit (ICU)

2-a) The ICU uses these Hall Sensor pulses to trigger the Ignition Coil (– terminal) to initiate timed sparks from the coil.

2-b) At the same time, The ICU also send the pulses to the FI ECU, to allow FI operation (no ICU pulses means no Fuel pumping).

3-a) The Fuel Injection (System) relay (previously energized at Key On) powers the AMM and ECU. The System relay lives with the Fuel (pump) relay in the same white plastic case. The LH 2.2 "pump" relay also powers the Injectors, IAC motor/valve, and the O2 sensor heater.

3-b) When ICU pulses are received by the FI ECU, it "energizes" the Fuel (pump) relay by grounding the relay coil (– side) to run the pumps.

When all these things work, the engine runs until the Ignition is switched off, which in turn shuts down the FI system.





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New 1986 740 tried everything still no fuel no spark [700]
posted by  volvoman1980  on Fri Jul 27 03:17 CST 2012 >


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