Signal Too Low
Signal too low
Diagnostic trouble code (DTC) ECM-5000 Air conditioning (A/C) pressure sensor. Signal too low
Reading off Diagnostic trouble code (DTC) status ECM-5000:
Note! When reading off the Diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.
- Read off 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 - Checking wiring and components
No - Intermittent fault
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Checking wiring and components
Check air conditioning (A/C) pressure sensor resistance. For resistance values, see A/C pressure sensor A/C Pressure Sensor.
Check signal cable between control module #A21 (#A21) and mass air flow (MAF) sensor terminal 2 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Hint: With the ignition on and air conditioning (A/C) pressure sensor connector disconnected the voltage between terminal 3 and ground terminal should be approximately 5V.
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace air conditioning (A/C) pressure sensor, see the relevant service procedure.
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components
- Ignition on.
- Read off air conditioning (A/C) pressure sensor signal.
The signal should be between 0.7 - 0.9 V.
Is the signal OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - Fault Found
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Intermittent fault
Signal too low. Intermittent fault
Checking wiring and connectors
Check signal cable between engine control module (ECM) #A21 (#A21) and air conditioning (A/C) pressure sensor terminal 2 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace the control module, see the relevant service procedure.
- To access/replace air conditioning (A/C) pressure sensor, see the relevant service procedure.
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Fault-tracing information
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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 wiring and connectors
FAULT FOUND - DONE
DONE - DONE
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DONE - DONE
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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 - Diagnostic trouble code (DTC) ECM-5000 Air conditioning (A/C) pressure sensor. Signal too low
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