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:
Circuit description
The intake air temperature (iat) sensor, mounted on the mass
air flow (maf) sensor, monitors the intake air temperature. The
iat sensor has a thermistor that varies its resistance depending
on the temperature of the intake air. When the air temperature
is low, the resistance in the thermisto ...
Inspection procedure
1 Check p squib circuit(airbag sensor assy center – instrument
panel passenger airbag assy)
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 instrument panel ...
Rear suspension
Preparation
Sst
Recomended tools
Equipment
Tire & wheel
Preparation
Equipment
...