240 L4-2320cc 2.3L SOHC B23F FI (1983)
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Full load enrichment system
These systems can also be checked with the use of the Monotester.
COLD START ENRICHMENT SYSTEM
This system is only engaged, when the coolant temperature is below +15 degrees C (+60 degrees F). This system can also be checked at temperatures
above +15 degrees C (+60 degrees F) by grounding terminal 7 at Lambda control unit.
The reading when activated should be 52 - 56 degrees.
ACCELERATION ENRICHMENT SYSTEM
This function is only engaged at coolant temperatures below 53 degrees C (+127 degrees F).
This system should be checked with a cold engine, but can also be checked with the engine at normal operating temperatures.
Procedure
Connect a vacuum pump to the pressure differential switch and evacuate switch.
Release vacuum. When vacuum is released, the switch closes. The dwell meter reading should change to 70 degrees or above for a short period and then
decrease.
NO READING OR INCORRECT READING
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Connect a jumper wire between the pins in the connector, as illustrated.
If meter now reads 70 degrees or above, wiring and control unit is OK.
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Check vacuum hoses (replace if applicable).
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Check thermo valve.
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Check differential switch.
FULL LOAD ENRICHMENT SYSTEM
