Toyota Corolla (E120) 2002–2008 Repair Manual / Heater & air conditioner / Refrigerant / On–vehicle inspection
Toyota Corolla (E120): On–vehicle inspection
1. Inspect refrigerant pressure with manifold gauge set
- this is a method in witch the trouble is located by using
a manifold gauge set. Read the manifold gauge pressure
when the these conditions are established.
Test conditions:
- temperature at the air inlet with the switch set at recirc is 30 – 35 °c (86 – 95 °f)
- engine running at 1500 rpm
- blower speed control switch at ”hi” position
- temperature control dial at ”cool” position a/c switch on
- fully open doors
- Normally functioning refrigeration system.
Gauge reading:
low pressure side:
0.15 – 0.25 Mpa (1.5 – 2.5 Kgf/cm2) high pressure side:
1.37 – 1.57 Mpa (14 – 16 kgf/cm2)
- Moisture present in refrigeration system.
Symptom |
Probable cause |
Diagnosis |
Remedy |
During operation, pressure on low pressure side sometimes become a vacuum and sometime normal | Moisture in refrigerating system freezes at expansion valve orifice causing a temporary stop of cycle, however, when it melts, normal state is restored. |
|
|
- Insufficient cooling
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Gas leakage in refrigeration system |
|
|
- Poor circulation of refrigerant
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Refrigerant flow obstructed by dirt in receiver | Receiver clogged | Replace condenser |
- Refrigerant does not circulate
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
|
Refrigerant does not circulate |
|
- Refrigerant overcharged or insufficient cooling of condenser
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
|
|
|
- Air present in refrigeration system
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Air entered in refrigerating system |
|
|
- Expansion valve improperly
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Trouble in expansion valve |
|
Check expansion valve |
- Defective compression compressor
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Internal leak in compressor |
|
Repair or replace compressor |
Gauge readings (reference)
Other materials:
Selecting shift ranges in
the D position
To drive using temporary shift
range selection, operate the "-"
or "+" paddle shift switch.
When the "-" paddle shift switch
is operated, the shift range
switches to a range that enables
engine braking force that is suitable
to driving conditions. When
the "+" paddle shift switch is
operated, the s ...
Basic inspection
Resistance measuring condition of electronic parts
unless stated, all resistance is measured at an ambient
temperature of 20 c (68 °F). As the resistance
may be outside the specifications if measured at high temperatures
immediately after
the vehicle has been running, measu ...
Inspection procedure
1 Check wire harness(airbag sensor assy center – front seat inner
belt assy lh)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the airbag sensor
assy center and the front seat inner belt assy ( ...