No Signal

No signal

Diagnostic trouble code (DTC) status ECM-500A. A/C pressure sensor. No signal

Reading off diagnostic trouble code (DTC)status ECM-500A
Note! When reading off the Diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

- Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).





Was the status of the relevant diagnostic trouble code (DTC) permanent?

Yes - Checking component and wiring

No - Intermittent fault

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Intermittent fault





Signal missing. Intermittent fault

Info
When the fault is no longer present, no fault-tracing for an intermittent fault is required.





Continue - DONE

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DONE - DONE

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Checking component and wiring
Check if there is any refrigerant in the air conditioning (A/C) unit.

Hint: If there is refrigerant in the A/C system there is probably a fault in the A/C pressure sensor.

Check the air conditioning (A/C) system for damage and leakage.
Remedy as necessary.

Other information:
- Connecting the breakout box / accessing the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box.
- Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5V) and #1 is the signal ground.
- For resistance values, see A/C pressure sensor A/C Pressure Sensor.
- For information about signals, see Signal Specifications.













Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall the connectors, components etc.
- Start the engine.
- Air conditioning (A/C) switch on
- Start the blower fan
Check that the pressure increases in the air conditioning (A/C) system when the air conditioning (A/C) compressor engages.
Also check if cold air blows into the passenger compartment when at the coolest setting.

Note! The air conditioning (A/C) pressure is given in volts for values see A/C pressure sensor A/C Pressure Sensor.









Does the pressure in air conditioning (A/C) system change?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

PAPER - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking component and wiring

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