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A/C SELF DIAGNOSTIC SYSTEMS
140 Chassis from 9/95
READING ACTUAL VALUES
1. IGNITION : Position 1
2. Press the AUTO button
3. Set both temperature selectors to 72 degrees F.
4. Press the REST button for more than 5 seconds.
5. The left display will alternately show the number "1" and the in-car temperature.
6. Press the AUTO button and the next component number and its value will be displayed.
7. Press the REST button to end the test program.
COMPONENT UNDER TEST
01 In-Car Temperature Sensor with Aspirator Blower (B10/4)
02 Outside Temperature Sensor (B10/5) 1996, (B14) as of 1997
03 Left Heater Core Temperature Sensor (B10/2)
04 Right Heater Core Temperature Sensor (B10/3)
05 Evaporator Temperature Sensor (B10/6)
06 Engine Coolant Temperature (ECT) Sensor (A/C) (B11/4)
07 Refrigerant Pressure in Bar
08 Refrigerant Temperature Sensor (B12/1)
10 Blower Control Voltage
11 Emissions (Refrigerant Leak) Sensor (B31)
12 Sun (Excessive Heat) Sensor (B32)
20 Control Current for Auxiliary Fan example : 7 = 7 mA
21 Engine RPM. example 00..99 (x100) = 9900
22 Vehicle Speed
23 PIN 58D example. 99.0 = 99% of Battery Voltage
24 Battery Voltage : 12.8 = 12,8 Volt
30 Left Rear Heater Core Temperature Sensor (B10/9)
31 Right Rear Heater Core Temperature sensor (B10/10)
32 Rear Evaporator Temperature Sensor (B10/11)
33 Rear Blower Control Voltage
34 Left Rear Temperature Sensor version
35 Right Rear Temperature Sensor
38 Rear A/C Controller Software Version Coding
39 Rear A/C Controller Hardware Version
40 Front A/C Controller Software Version Coding
41 Front A/C Controller Hardware Version
42 Variant code 1
43 Variant code 2
FAULT DIAGNOSIS
1. IGNITION : Position 1
2. Left Temperature selector wheel : HI
Right Temperature selector wheel : LO
3. Within 20 seconds press the REST and EC buttons simultaneously for more than 5 seconds.
4. The LED in the RECIRCULATE button flashes and "OFF" appears on the display.
5. Press the right AUTO button until all DTC's are displayed and recorded.
6. To erase all codes must be read out. Press both AUTO buttons simultaneously for more than 2 seconds. "d" will be displayed on
the left and "FF" is displayed on the right. The erase can be canceled by pressing the AUTO button.
7. Reset temperature selector to normal setting.
8. IGNITION : OFF to end the test program.
FAULT CODES
026 CAN Bus Communication
226 In-Car Air Temperature Sensor (B10/4)
227 Outside Air Temperature Sensor (B10/5) to 1996, (B14) as of 1997
228 Left Heater Core Temperature Sensor (B10/2)
229 Right Heater Core Temperature Sensor (B10/3)
230 Evaporator Temperature Sensor (B10/6)
231 Engine Coolant Temperature Sensor (B11/4) or DFI or IFI models Right Engine Coolant Temperature Sensor (B11/10) to 1996
232 Refrigerant Pressure Sensor (B12)
233 Refrigerant Temperature Sensor (B12/1)
234 Sun Sensor (B32)
235 Emissions (Refrigerant Leak) Sensor (B31)
241 Refrigerant Level
416 Coolant Circulation Pump (A31m1)
417 Left Duovalve (Water Valve) (Y21y1)
418 Right Duovalve (Water Valve) (Y21y2)
419 A/C Compressor Electromagnetic Clutch (A9k1)
420 Closed (Idle) Throttle Speed Increase
421 Pulse Module (N65)
422 Serial Interface Connection (K1) to Instrument Cluster (IC)
423 Switchover Valve Block (Y11)
424 Activated Charcoal Filter Actuator (A32m2) : OPEN
425 Activated Charcoal Filter Actuator (A32m2) : CLOSE
432 Maximum Heat
459 Serial Interface Connection (K2) to Instrument Cluster (IC)
460 LED - Center Air Outlet "Warm"
461 LED - Center Air Outlet "Cold"
462 Wide Open Throttle (WOT) Position Signal - Diesel Engine Only
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