Signal Too High. Permanent Fault
Signal too high. Permanent fault
EFI-422 Atmospheric pressure sensor, signal
Checking ground lead
- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Disconnect atmospheric pressure sensor (lilac connector).
Connect an ohmmeter between atmospheric pressure sensor connector 2 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.
- Atmospheric 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 atmospheric pressure sensor connector 2 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 atmospheric pressure sensor terminal 2 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.
- Atmospheric pressure sensor disconnected.
Connect an electrician's screwdriver (3 W bulb at least) between atmospheric pressure sensor connector terminal 2 and ground.
The bulb should not light.
OK - Checking signal cable resistance
Not OK - Checking for a short-circuit
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Checking for a short-circuit
- Check the cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B22 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.
- Atmospheric pressure sensor disconnected.
Connect an ohmmeter between atmospheric pressure sensor connector 3 and ground.
The ohmmeter should read less than approximately 10 kohms.
OK - Checking power cable
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check the cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B22 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 power cable
- Ignition on.
- Atmospheric pressure sensor disconnected.
Connect a voltmeter between atmospheric pressure sensor connector terminal 1 and ground.
The voltmeter should read approximately 5 V.
OK - Replacing component
Not OK - Checking cables
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Replacing component
- Try a new atmospheric pressure sensor.
Select "Continue" when the fault has been repaired.
Continue - Verification
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Checking cables
- Ignition off.
- Disconnect air conditioning (A/C) pressure sensor, fuel tank pressure sensor and accelerometer.
- Atmospheric pressure sensor disconnected.
- Ignition on.
Connect a voltmeter between atmospheric pressure sensor connector terminal 1 and ground.
The voltmeter should read approximately 5 V.
OK - Checking fuel tank pressure sensor
Not OK - Checking for a short-circuit
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Checking for a short-circuit
The atmospheric pressure sensor power cable is connected inside the engine control module (ECM) to the air conditioning (A/C) pressure sensor, fuel tank pressure sensor and accelerometer power cables.
If anything happens to any of these cables all four will be affected.
Check cables between:
- Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
- tank pressure sensor terminal 1 and engine control module (ECM) #B15.
- Accelerometer terminal 1 and engine control module (ECM) #B1.
- atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29
- 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 check has been made.
Continue - Verification
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Checking fuel tank pressure sensor
- Ignition off.
- Connect fuel tank pressure sensor.
- Atmospheric pressure sensor, air conditioning (A/C) pressure sensor and accelerometer disconnected.
- Ignition on.
Connect a voltmeter between atmospheric pressure sensor terminal 1 and ground.
The voltmeter should read approximately 5 V.
OK - Checking the air conditioning (A/C) pressure sensor
Not OK - Replacing component
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Replacing component
- Try a new fuel tank pressure sensor.
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.
- Atmospheric pressure sensor and accelerometer disconnected.
- Ignition on.
Connect a voltmeter between atmospheric pressure sensor terminal 1 and ground.
The voltmeter should read approximately 5 V.
OK - Replacing component
Not OK - Replacing component
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Replacing component
- Try a new accelerometer.
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.
- Reconnect connectors and reinstall components.
- Start the engine and idle it.
- Wait for a minute.
- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).
If EFI-422 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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