No Signal

ECM-500A AIR CONDITIONING (A/C) PRESSURE SENSOR
FAULTY SIGNAL

Reading off the status of the diagnostic trouble code (DTC):




Note! When Reading the Diagnostic Trouble Code (DTC) status, other stored Diagnostic Trouble Codes (DTCs) and their status will be listed.

- Read 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) displayed as permanent?
Yes - Skip to "Checking Component and Wiring"
No - Continue below.


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


Checking Component and Wiring



Check if there is any refrigerant in the air conditioning (A/C) unit.
Hint: If there is refridgerant 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.


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components
- 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.

Does the pressure in the air conditioning (A/C) system change?
Yes - Testing Complete.
No - Continue below.


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.