Signal Too Low
Signal too low
Checking damper motor recirculation function
- Disconnect the Volvo Scan Tool (ST) from the VADIS station. Use it in stand-alone mode and connect it to the data link connector (DLC).
- Ignition on.
- Wait at least 10 seconds so the control module can run diagnostics.
- Read off the diagnostic trouble code (DTC) counters.
Check the counter value. If the counter is greater than 0 the control module interprets it as an intermittent fault. If the counter is 0 the control module interprets it as a permanent fault.
Is counter value greater than 0?
Yes - Intermittent fault
No - Checking connectors
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Checking connectors
- Ignition off.
- Corrective action to damper motor and control module connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check any damage etc.
- Reinstall components, reconnect connectors etc.
- Disconnect the Volvo Scan Tool (ST) from the VADIS station. Use it in stand-alone mode and connect it to the data link connector (DLC).
- Ignition on.
- Wait at least 10 seconds so the control module can run diagnostics.
- Read off the diagnostic trouble code (DTC) counters.
Check the counter value. If the counter is greater than 0 the control module interprets it as an intermittent fault. If the counter is 0 the control module interprets it as a permanent fault. If the value changes now it indicates that the damper motor is OK and that the cause of the fault was poor contact in the connectors.
Other information:
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- To gain access to the recirculation damper motor, refer to Replacing damper motors Removal and Replacement.
Is counter value greater than 0?
Yes - FAULT FOUND
No - Checking component
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Checking component
Check signal cable between ECC control module #A29 and damper motor terminal 3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable for power supply between ECC control module #A7 and damper motor terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new damper motor.
Remedy as necessary.
Other information:
- To access/replace recirculation damper motor, refer to Replacing damper motors Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- Voltage on signal cable varies between approximately 0-5 V depending on damper motor position. Power supply to damper motor should be approximately 5 V. For other values, Signal specification ECC Signal Specification ECC.
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 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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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
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Disconnect Volvo Scan Tool (ST) from the VIDA unit. Use it as a stand-alone tool and connect to the car's data link connector (DLC).
- Ignition off
- Reconnect connectors, reinstall components.
- Ignition on.
- Wait at least 10 seconds so the control module can run diagnostics.
- Read off the diagnostic trouble code (DTC) counters.
Check the values of the counters. If the value is greater than 0 the control module interprets this as there no longer is a fault present (intermittent fault). If the counter is 0 this indicates that there is an internal fault in the control module, and the fault is still there (permanent fault).
Is counter value greater than 0?
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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Intermittent fault
Check signal cable between ECC control module #A29 and damper motor terminal 3 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check cable for power supply between ECC control module #A7 and damper motor terminal 2 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information:
- To access/replace recirculation damper motor, refer to Replacing damper motors Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- Voltage on signal cable varies between approximately 0-5 V depending on damper motor position. Damper motor power supply should be approximately 5 V. For other values, see Signal specification ECC Signal Specification ECC.
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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