Faulty Signal
Faulty signal
Checking function passenger compartment temperature selector
- Ignition on.
- Go into scrolling values.
- Read off the current passenger compartment temperature selector position.
Turn blower fan switch slowly between limit positions several times and check that all the values shown are correct in relation to the position indicated on the control panel text section.
Is temperature selector switch OK?
Yes - Intermittent fault
No - Reading off data and replacing components
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Reading off data and replacing components
Note! Before replacing a control module the programmed data must be read off first if this is possible.
- Ignition on.
- Use Programming function to read out all data from ECC control module and note down the values. These values must be used to program the new control module. For further information about programming, refer to Description of ECC programmed data Programming The ECC Control Module.
Then try a new ECC control module according to Replacing ECC control module Removal and Replacement.
Continue - Programming data
Programming the ECC control module
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Programming the ECC control module
FAULT FOUND - Self-adjusting of shutter motor end position
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Self-adjusting of shutter motor end position
Self-adjustment of the damper motor limit positions (ECC)
Self-adjustment of the shutter motor end position
Note! Self-adjustment must be carried out if the control module or damper motor is replaced or the damper motor or its linkage has been removed. A new control module will cause the green indicator LED on the air conditioning (A/C) switch to flash until self-adjustment has been carried out. The green LED on the air conditioning (A/C) switch will flash until the self-adjustment of a new control module has been carried out. When self-adjusting has been correctly completed, the green indicator LED will stop flashing.
Hint: During self-adjustment the control module runs the damper motors to their limit positions. The control module then stores the value returned from the position sensor for the damper motor. The control module is then able to operate the motor between the limit positions during normal operation.
- Start the engine (the generator charges)
- Use the Adjusting Motors function to activate self-adjusting on the damper motors. This takes approximately thirty seconds.
Select one of the following options:
1. Exit self-adjustment
2. Read data about problems during self-adjustment.
1 - FAULT FOUND
2 - Checking causes of no self-adjustment
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Checking causes of no self-adjustment
Checking causes of no self-adjustment
Checking causes of no self-adjustment
Check and/or remedy the following if damper motor self-adjustment is interrupted or is not possible.
Start the engine (the generator (GEN) charges). Climate control unit (ECC) terminal #B3 receives a signal from the generator indicating that there is charging. This is to supply the damper motors with maximum power supply during adjustment. If the signal is missing, the adjustment is not permitted to start. Read off the "Generator D+" parameter. Check that the signal is being transmitted.
Switch off the engine. Start the engine again. If self-adjustment has been carried out in the current ignition cycle, the control module will not perform a new self-adjustment until the ignition has been switch off and the engine re-started. Try to perform self-adjustment again.
Read off the diagnostic trouble codes (DTCs). Carry out any fault-tracing according to the instructions.
Check that the control module power supply (terminal #B5) and power ground (terminal #A23) is OK.
Check that the position sensor circuit is OK for both the temperature damper motors.
Check the signals to control module terminals #A7, #A13 and #A22 for the right temperature damper motor.
Check the signals to control module terminals #A7, #A12 and #A22 for the left temperature damper motor.
Check that the damper, linkage, cam discs, damper motors etc are correctly installed and can move freely and smoothly to the limit positions. Check the damper motor shaft and its mounting in the damper spindle in particular for damage and cracks etc.
Other information:
- For information about signals, see Signal specification ECC Signal Specification ECC
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
Do you want to try self-adjustment again?
Yes - Attempt New Test
No - DONE
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Attempt New Test - Self-adjustment of the shutter motor end position
DONE - FAULT FOUND
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FAULT FOUND - Verification
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Programming data
Note! The new control module must be programmed using the data read off from the old control module. If the new ECC control module is to function correctly it has to be programmed with the driver position. Before the control module is programmed the green LEDs in the REC and A/C buttons will blink.
- Ignition on.
- Set the blower fan speed selector switch to AUTO.
- Use Programming function to program the ECC control module. For further information about programming, Programming The ECC Control Module.
- After programming in the driver position the green LED in the A/C button will flash and continue to do so until the automatic damper motor adjustment is completed. Press "Continue" to carry out automatic self-adjustment.
Continue - Self-adjusting of shutter motor end position
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Self-adjusting of shutter motor end position
Activate function Self-adjustment of the damper motor limit positions (ECC).
Continue - Verification
DONE
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Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Go into scrolling values.
- Read off the current passenger compartment temperature selector position.
Turn blower fan switch slowly between limit positions several times and check that all the values shown are correct in relation to the position indicated on the control panel text section.
Is temperature selector switch OK?
Yes - FAULT FOUND
No - Fault-tracing information
No Fault Found
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking function passenger compartment temperature selector
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Intermittent fault
Fault-tracing indicates that the ECC control module registered a fault previously on the temperature selector switch but the fault is now no longer present.
Continue - Fault-tracing information
DONE
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking function passenger compartment temperature selector
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