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 field1), 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, Part 1:

Display Field 1, Part 2:

Display Field 1, Part 3:

Display Field 1, Part 4:

Display Field 1, Part 5:

Display Field 2 - 4: