Active Too Long
Active too long
Checking function air distribution damper motor
- Ignition on.
- Start the blower fan or let the engine idle.
- Read off the damper motor position sensor.
- Activate damper motor by turning the control for air distribution to its different positions.
Check that position sensor values change when the control is turned. If value changes this indicates that damper motor is OK.
Does the position sensor value change?
Yes - Intermittent fault
No - Checking components
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Checking components
Check that the damper, linkage and gear segment can move freely and smoothly to the end positions.
If damper/shutter is OK, try a new damper motor.
Remedy as necessary.
Other information:
- To access/replace the damper motor for air distribution, refer to Replacing damper motors Removal and Replacement.
Continue - Self-adjusting of shutter motor end position
Self-adjusting of shutter motor end position
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Self-adjusting of shutter motor end position
Self-adjustment of the shutter motor end position
Self-adjustment of the damper motor limit positions, ECC
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.
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.
When self-adjusting is complete the green indicator LED will stop flashing.
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 damper motor limit positions, ECC
DONE - FAULT FOUND
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FAULT FOUND - Verification
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Self-adjusting of shutter motor end position
Activate function Self-adjustment of the shutter motor end position.
Continue - Verification
DONE
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Start the blower fan or let the engine idle.
- Read off the damper motor position sensor.
- Activate damper motor by turning the air distribution selector between its different positions.
Check that position sensor value changes as the selector is turned. If value changes this indicates that damper motor is OK.
Does the position sensor value change?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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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 air distribution damper motor
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Intermittent fault
Fault-tracing indicates that the ECC control module registered a fault previously on the damper motor but the fault is now no longer present. The earlier fault could have been caused by the damper sticking, dirt in the mechanism or in the linkage.
Remedy as necessary.
Other information:
- To access/replace the air distribution damper motor, refer to Replacing damper motors Removal and Replacement.
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 air distribution damper motor
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