CAUTION: Use care when handling the carburetor to avoid damage to the EFE heater.
After assembling the heater, check that there are no foreign objects left on it.
Check that the O-ring and gland are properly installed.
When removing or installing the heater, do not pull on the electrical wiring.
Before removal, be sure to disconnect the connector from the secondary engine wiring harness. Disconnect the 2-pin connector near the carburetor.
Measure the resistance between the white and black heater terminals.
If the resistance is infinite, replace the heater; if not, start the engine.
Attention! Coolant temperature must be below 60°C.
Next, measure the voltage between the White (+) and Cherny (-) terminals on the engine wiring harness. If there is battery voltage, then see paragraph A), if not - item B).
A) Warm up the engine to operating temperature until the cooling fan turns on. If there is no voltage after this, then the EFE system is normal.
If there is voltage, then disconnect the 2-pin connector near the heater turnip.
Next, measure the voltage between the Blue (+) and Cherny (-) terminals on the main engine wiring harness.
If there is no voltage, then the relay should be replaced.
If there is voltage, then refer to the EFE control module performance test.
B) Measure the voltage between White (+) contact and weight.
If there is battery voltage, then the break in the Black wire between the heater and point G4 should be repaired.
If there is no voltage, then you should check for an open White wire between the heater and the heater relay. If the wire is OK, then disconnect the 2-pin connector near the heater relay.
Next, measure the voltage between White/Red (+) wire and weight.
If there is no voltage, then check fuse No. 24 (30 A). If the fuse is OK, repair the open in the White/Red wire between the relay and fuse #24.
If there is battery voltage, then disconnect the 2-pin connector near the heater relay.
Next, measure the voltage between the blue (+) and Cherny (-) terminals on the main engine wiring harness.
If there is no voltage, then the relay should be replaced.
If there is battery voltage, then measure the voltage between the Blue (+) contact and weight.
If there is battery voltage, then you should repair the open in the Black wire between the relay and point G4.
If there is no battery voltage, the Blue wire between the relay and the EFE control module should be checked for an open. If the wire is normal, then you should refer to the performance test of the EFE control module.