Diagnostic Manual, Climate Control, Volume 1
Diagnosis - Reading Actual Values (via A/C Pushbutton Control Module [N22])
1. The display window will show in sequence the current data from the A/C pushbutton control
module (N22).
2. The temperature control is maintained during the duration
of the test. |
|
 |
| |
|
P83.40-2028-04 |
Preparation for Test
1. Ignition: ON
2. Set temperature selection to   °F.
3. Press  for more than 6 seconds.
4. The left side of the display window will alternately display the number    and the in-car temperature (e.g. °F)
5. By pressing  + the next highest test step is displayed (see table).
6. Press to end test program.
Note:
The display will, or "    " if there is an open circuit, "   " if there is a short circuit.
|
Display code in
N22 window |
 |
Possible cause |
Test step/Remedy 1) |
| |
|
In-car temperature sensor (B10/4) |
 23  4.0 |
| |
|
Outside temperature indicator temperature sensor (B14) |
23 10.0 |
 |
|
Left heater core temperature sensor (B10/2) |
23 7.0 |
 |
|
Evaporator temperature sensor (B10/6) |
23 5.0 |
 |
|
ECT sensor (DFI, IFI) (B11/4) |
23 10.0 |
| |
|
Refrigerant pressure in bar, e.g. °  corresponds to 6.4 bar (B12) |
23 8.0 |
 |
|
Refrigerant temperature sensor (B12/1), e.g, ° corresponds to 73.4 ° F |
23 6.0 |
 |
- 2) |
Not used |
- |
| |
|
Blower control voltage, e.g. ° (min) - ° (max) corresponds to
0.8 - 6.0 volts |
23 20.0 |
| |
- 2) |
Control current for auxliary fan e.g. corresponds to 7 mA |
23 16.0 |
| |
|
Engine speed, e.g. . . (x 100) corresponds to 9900 rpm |
23 10.0 |
| |
|
Vehicle speed 155 (km/h) |
23 10.0 |
| |
|
Terminal 58d e.g. corresponds to 99 % battery voltage |
- |
| |
- |
Battery voltage e.g.   12.5V |
23 1.0 |
| |
3) |
Software status e.g. |
- |
| |
3) |
Hardware status e.g. |
- |
| |
2) |
Version code 1. number code e.g. |
- |
| |
2) |
Version code 2. number code e.g.   benzin (gasoline) |
- |
| |
- |
not used |
- |
| |
- |
not used |
- |
| |
- |
Nominal value (temperature selection) |
- |
| |
|
A/C compressor emergency shut off e.g.  |
23 23.0 |
| |
2) |
Roof e.g. OPE = open, CLO = closed |
23 13.0 |
| |
2) |
Left air outlet, potentiometer voltage e.g. V |
23 27.0 |
| |
2) |
Vacuum actuator 46, feedback potentiometer voltage e.g. V |
23 24.0 |
| |
2) |
Center air outlet, potentiometer voltage e.g. V |
23 28.0 |
| |
2) |
Vacuum actuator 47, feedback potentiometer voltage e.g. V |
23 25.0 |
| |
2) |
Right air outlet, potentiometer voltage e.g. V |
23 29.0 |
| |
2) |
Vacuum actuator 48, feedback potentiometer voltage e.g. V |
23 26.0 |
1) Observe Preparation for Test.
2) Activate menu.
3) Control module identification.
4) Version coding menu. |
|
Printable version
