AC-48
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTICS FOR A/C SYSTEM FAILURE (RHD MODEL)
12
CHECK GROUND CIRCUIT OF SUB FAN
MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between sub fan motor
connector and chassis ground.
Connector & terminal
4 CYLINDER MODEL
(F16) No. 1 — Chassis ground:
6 CYLINDER MODEL
(F16) No. 4 — Chassis ground:
Is the measured value less than the speci-
fied value?
1
Ω
Go to step 13.
Repair harness
between sub fan
motor connector
and chassis
ground.
13
CHECK POOR CONTACT.
Check poor contact in sub fan motor connec-
tor.
Is there poor contact in connector?
There is no poor contact in
connector.
Go to step 14.
Repair poor con-
tact in sub fan
motor connector.
14
CHECK SUB FAN MOTOR.
4 CYLINDER MODEL
Connect battery positive (+) terminal to termi-
nal No. 2, and negative (
−
) terminal to terminal
No. 1 of sub fan motor connector.
6 CYLINDER MODEL
Connect battery positive (+) terminal to termi-
nal No. 1, 2, 3, and negative (
−
) terminal to ter-
minal No. 4 of sub fan motor connector.
Does the sub fan motor rotate?
Sub fan motor rotates.
Go to step 15.
Replace sub fan
motor with a new
one.
15
CHECK EACH SENSOR AND POTENTIOME-
TER.
Check the sensors and potentiometer for
proper operation using the self-diagnostic
function. <Ref. to AC-18, OPERATION, Self-
Diagnosis Procedure (RHD Model).>
Is the operation of each sensor and potentiom-
eter normal?
Operation of each sensor and
potentiometer is OK.
Go to step 16.
Replace sensor
and/or potentiome-
ter.
16
CHECK CONNECTION OF ASPIRATOR
DUCT.
Make sure that the connection of aspirator duct
is correct.
Is the connection of duct correct?
Connection is OK.
Go to step 17.
Repair aspirator
duct connection.
17
CHECK EACH ACTUATOR.
Check the actuators for proper operation using
the self-diagnostic function. <Ref. to AC-18,
OPERATION, Self-Diagnosis Procedure (RHD
Model).>
Is the operation of each actuator normal?
Operation of each actuator is
OK.
Go to step 18.
Replace actuator.
18
CHECK POOR CONTACT.
Check poor contact in A/C control module con-
nector.
Is there poor contact in connector?
There is no poor contact.
Replace A/C con-
trol module.
Repair connector.
Step
Value
Yes
No