IHKS Diagnosis

IHKS DIAGNOSIS

The IHKS system is not connected to the diagnostic link. Conventional troubleshooting methods are used for diagnosis/troubleshooting problems with this system.

The best diagnostic tool you can have is a thorough understanding of the system's individual components and the way they work. You should know which inputs affect which outputs, and how the ECM and IHKS module will respond if an input is outside allowable values.

Also, know how to use the resources available to you:

- Electrical Diagrams.
- Service-Information Bulletins.
- Diagnosis and Information System (DIS).
- If insufficient cooling is the complaint, make sure the water valve is actually closing. Technician Tip: have an assistant turn the temperature knob from the Full Hot to the Full Cold position and back several times. Use a stethoscope to listen to the water valve, to make sure it is actually closing, and check temperature of heater hoses.
- Check high-side and low-side pressures when the compressor is operating.
- When leak checking, look for wet spots on the hoses or at fitting connections.