Toyota Avensis ZZT251 2003 Service And Repair Manual page 1313

55–18
DTC No.
071 Surface sensor break
072 Surface sensor short–circuit
090 Control unit detective (Internal fault / Reset)
092 Control unit detective (ROM error)
093 Control unit detective (RAM error)
097 Internal control unit faults
AVENSIS REPAIR MANUAL (RM1018E)
HEATER & AIR CONDITIONER
Description of fault
http://vnx.su
– COMBUSTION TYPE POWER HEATER SYSTEM
Comment / Remedy
Check connecting leads.
Resistance value between 4 and 11 at connector B > 2 MW (If
break)
Check connecting leads.
Resistance value between 4 and 11 at connector B > 50 W (If
short–circuit)
Control unit malfunction due to interference voltage from ve-
hicle electrical system;
possible causes low batteries, chargers, other sources of
interference; eliminate interference voltages.
Internal faults detected in microprocessor / memory detected.
Replace control unit.
Other faults which cannot lead to DTC No. 90, 92 and 93,
replace control unit.