Signal Too High. Permanent Fault
Signal too high. Permanent fault
EFI-225 Air conditioning (A/C) pressure sensor, signal
Checking ground lead
- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Disconnect the air conditioning (A/C) pressure sensor.
Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground.
The ohmmeter should read approximately 0 ohms.
OK - Checking the signal cable
Not OK - Checking control module connector
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Checking control module connector
- Ignition off.
- Air conditioning (A/C) pressure sensor disconnected.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Control module connected.
Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground.
The ohmmeter should read approximately 0 ohms.
OK - Checking the signal cable
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check cable between air conditioning (A/C) pressure sensor terminal 1 and engine control module (ECM) #B28 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking the signal cable
- Ignition on.
- Air conditioning (A/C) pressure sensor disconnected.
Connect a voltmeter between air conditioning (A/C) pressure sensor connector 2 and ground.
The voltmeter should read approximately 0 V.
OK - Checking signal cable resistance
Not OK - Checking for a short-circuit
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Checking for a short-circuit
- Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking signal cable resistance
- Ignition off.
- Air conditioning (A/C) pressure sensor disconnected.
Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 2 and ground.
The ohmmeter should read approximately 10 kohms.
OK - Checking the air conditioning (A/C) pressure sensor
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking the air conditioning (A/C) pressure sensor
- Ignition off.
- Connect air conditioning (A/C) pressure sensor.
- Start the engine and idle it.
- Air conditioning (A/C) switch on.
- Blower fan on.
- Select Volvo Scan Tool (ST) to read off the value of the air conditioning (A/C) pressure sensor signal.
Voltage should increase when the air conditioning (A/C) compressor starts.
OK - Checking for contact resistance and oxidation
Not OK - Replacing component
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Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the air conditioning (A/C) pressure sensor connector.
- Check connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Replacing component
- Try a new air conditioning (A/C) pressure sensor.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition off.
- Air conditioning (A/C) pressure sensor and engine control module (ECM) connected.
- Start the engine and idle it.
- Air conditioning (A/C) switch on.
- Blower fan on.
- Wait until the air conditioning (A/C) compressor has started.
- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).
If EFI-225 is stored it should have intermittent status.
OK - VERIFIED
Not OK - 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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Attempt New Test - Checking ground lead
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