Initial Inspection
General DescriptionINSPECTION
Before performing diagnosis, check the following items which might affect engine problems.
1. BATTERY
1. Measure battery voltage and specific gravity of electrolyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
2. Check the condition of the fuses for A/C, heater and other fuses.
3. Check the condition of the harnesses and harness connectors connection.
2. ASPIRATOR HOSE
1. Turn ignition switch to ON.
2. Push "DEF" switch and then blower fan switch to turn the blower fan to maximum speed.
3. Firmly hold a thin thread (b) in front of the in-vehicle sensor suction port (a) for the auto A/C control unit and check that the thread moves towards the port indicating that air is being sucked into the port.
NOTE: Ensure the thread does not get sucked into the port.
4. If the thread does not move at all, remove the auto A/C control unit and check for improper connection of the aspirator hose (a) and auto A/C control unit and secure as necessary.
3. REFRIGERANT LINE
Check contact for refrigerant line (A).
4. CONTROL LINKAGE
1. Check state of mode door control rod and linkage.
2. Check state of air mix door control rod and linkage.
3. Check state of intake door control rod and linkage.
5. CONTROL SWITCHES
Start and warm up engine completely.
1. Inspection using switches.
2. Compressor operation inspection
3. Illumination control inspection