Page 223 - Foton Workshop Manual - Auman EST-M

Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts
Failure phenomenon list
Use the list below to help you find the reasons of failures. The number represents the order of failure reason
possibility. Check each part according to the order and replace it when necessary
Failure phenomenon
The whole AC is not working
Internal and external circulation motor damage or internal and external
not working
The blower is not working
Fan speed regulation abnormal
Compressor does not work
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Possible reason Failure elimination
1. Air condition controller circuit (loose
Check and repair the circuit or connector EG
connector or open circuit)
Check, repair or replace the AC
2. Air condition controller TR
controller
1. Internal and external circulation Maintain or replace the internal and
motor (damage) external circulation motor AX
2. Air condition controller (internal
Check, repair or replace the AC
controller FR
circulation selection button failure)
3. Internal and external circulation
ST
motor circuit (loose connector or open Check and repair the circuit or connector
circuit)
1. Fuse (broken) Replace the fuse BR
2. Relay (broken) Replace the replay
3. Blower circuit (loose connector or BW
Check and repair the circuit or connector
open circuit)
4. Blower (damaged) Maintain or replace the fan
EL
Check, repair or replace the AC
5. Air quantity knob (broken)
controller assembly
Maintain or replace the speed regulation
1. Speed regulation resistance
resistance
Check, repair or replace the AC
2. Air quantity knob (broken)
controller assembly
3. Speed regulation circuit (loose
Check and repair the circuit or connector
connector or open circuit)
After leakage detection, refill the
1. Refrigerant (leak completely)
refrigerant
2. Fuse (broken) Replace the fuse
3. Relay (broken) Replace the replay
4. Evaporator temperature sensor Replace the temperature sensor of
(damaged) evaporator
5. Air conditioning pressure switch Replace the air conditioning pressure
(damaged) switch
6. Connector (connector loose or
Reinstall the connector
detached)
7. Compressor belt (slip or loose) Readjust the belt or change the belt
8. Compressor (compressor damaged or
Maintain or replace the compressor
electromagnetic clutch damaged)
9. Engine ECU (broken) Replace engine ECU
10. Air condition controller (damaged) Replace the air condition controller
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