Signal Too High In Common Circuit
Signal too high in common circuit
Checking diagnostic trouble code (DTC) counters
Hint: Diagnostic trouble codes (DTCs) ECC-122, ECC-211, ECC-222, ECC-231, ECC-235 stored at the same time indicate a fault in a common section of the damper motor and outside temperature sensor circuit. The status of the fault can be read off by checking the diagnostic trouble code (DTC) counter. This is why this fault-tracing should be carried out.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station. Use it in stand-alone mode and connect it to the data link connector (DLC).
- Ignition on.
- Wait at least 10 seconds for the control module to carry out its diagnostic.
- Read off COUNTER 1 for one of the above diagnostic trouble codes (DTCs).
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 cables
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Checking cables
Check ECC control module connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If diagnostic trouble codes (DTC)s ECC-211, ECC-222, ECC-231 and ECC-235 are stored:
Check the common power supply cable between ECC control module #A7 and damper motor terminal 2 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If, in addition, diagnostic trouble code (DTC) ECC-122 is stored:
Check the common ground lead between ECC control module #A22 and damper motor terminal 1 and outside temperature sensor terminal 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information
- To disconnect the control module, see Replacing ECC control module Removal and Replacement.
- To access the passenger side temperature damper motor, see Replacing damper motors Removal and Replacement.
- To access the driver's side temperature damper motor, see Replacing damper motors Removal and Replacement.
- To access the air distribution damper motor, see Replacing damper motors Removal and Replacement.
- To access the recirculation damper motor, see Replacing damper motors Removal and Replacement.
- To access the outside temperature sensor, see Replacing outside temperature sensor (Electronic climate control) Removal and Replacement
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- The power supply to the damper motors should be approximately 5 V. For other values, see Signal specification ECC Signal Specification 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 ECC control module connector for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
If diagnostic trouble codes (DTC)s ECC-211, ECC-222, ECC-231 and ECC-235 are stored:
Check the common power supply cable between ECC control module #A7 and damper motor terminal 2 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
If, in addition, diagnostic trouble code (DTC) ECC-122 is stored:
Check the common ground lead between ECC control module #A22 and damper motor terminal 1 and outside temperature sensor terminal 4 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults
Remedy as necessary.
Other information:
- To disconnect the control module, see Replacing ECC control module Removal and Replacement.
- To access the passenger side temperature damper motor, see Replacing damper motors Removal and Replacement.
- To access the driver's side temperature damper motor, see Replacing damper motors Removal and Replacement.
- To access the air distribution damper motor, see Replacing damper motors Removal and Replacement.
- To access the recirculation damper motor, see Replacing damper motors Removal and Replacement.
- To access the outside temperature sensor, see Replacing outside temperature sensor (Electronic climate control) Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- The power supply to the damper motors should be approximately 5 V. For other values, see Signal specification ECC Signal Specification ECC.
Continue - 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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