Evaluating Display Group 001

Display group 001 - Compressor cut-off conditions, voltage for A/C clutch and at terminal 15

NOTE:
- If compressor cut-off condition 1, 8, 11 or 12 exists, the A/C clutch -N25- cannot be actuated during the output diagnostic test mode.
Output Diagnostic Test Mode (DTM) (Function 03)

- If compressor cut-off condition 5 appears together with another compressor cut-off condition, disregard cut-off condition 5.
- If several compressor cut-off conditions exist simultaneously (display field 1), the display will either show them all alternately or it will show only the cut-off condition which is assigned the highest priority by the A/C Control Head -E87- .
- If the A/C pressure switch -F129- is open, compressor cut-off condition 1 (excess pressure) will appear initially and the compressor is switched off. If -F129- remains open for more than 30 seconds, the system will switch to compressor cut-off condition 3 (low pressure, refrigerant circuit empty).
- As a running change in production, pressure switch -F129 is replaced by high pressure sensor -G65-.
- High pressure sensor -G65- transmits a square wave signal at a rate which varies according to the refrigerant system pressure.
- Coolant Fan Control (FC) Module -J293 reacts to the pulse rate of the signal from high pressure sensor -G65 as follows:
1) It informs the A/C Control Head -E87- that the pressure in the refrigerant system is OK and that A/C clutch -N25- can be switched on (compressor is switched on via -J293-. 2) If the refrigerant system pressure rises, the control unit switches the radiator fan to speed 2.

Display Field 1:

Display Field 1:

Display Field 1:

Display Field 1:

Display Field 2 - 4: