Signal Too High. Permanent Fault
Signal too high. Permanent fault
EFI-444 Accelerometer, signal
Checking power cable
- Ignition off.
- Disconnect accelerometer.
- Ignition on.
Connect a voltmeter between accelerometer connector terminal 1 and ground.
The voltmeter should read 5 V.
OK - Checking ground lead
Low - Checking power cable resistance to ground
High - Checking for a short-circuit
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Checking for a short-circuit
The accelerometer power cable is connected inside the engine control module (ECM) to the fuel tank pressure sensor, atmospheric pressure sensor and air conditioning (A/C) pressure sensor power cables. If anything happens to any of these cables all four will be affected. Air conditioning (A/C) pressure sensor wiring is pre-routed, even on cars without air conditioning, and should always be checked.
Check cables between:
- Accelerometer terminal 1 and engine control module (ECM) #B1.
- Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
- atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29
- tank pressure sensor terminal 1 and engine control module (ECM) #B15 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking ground lead
- Ignition off.
- Accelerometer disconnected.
Connect an ohmmeter between accelerometer connector terminal 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.
- Accelerometer 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 accelerometer connector terminal 2 and ground.
The ohmmeter should read approximately 0 ohms.
OK - Fault-tracing information
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check cable between accelerometer 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.
Continue - Verification
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.
Continue - Verification
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Checking the signal cable
- Ignition on.
- Accelerometer disconnected.
Connect a voltmeter between accelerometer connector terminal 3 and ground.
The voltmeter should read approximately 5 V.
OK - Checking accelerometer
Low - Checking control module connector
High - Checking for a short-circuit
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Checking for a short-circuit
- Check cable between accelerometer terminal 3 and engine control module (ECM) #B32 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking control module connector
- Ignition off.
- Accelerometer 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.
- Ignition on.
Connect a voltmeter between accelerometer connector terminal 3 and ground.
The voltmeter should read approximately 5 V.
OK - Fault-tracing information
Not OK - Checking for an open-circuit
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.
Continue - FAULT FOUND
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Checking for an open-circuit
- Check cable between accelerometer terminal 3 and engine control module (ECM) #B32 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking accelerometer
- Ignition on.
- Connect the accelerometer.
- Select Volvo Scan Tool (ST) to erase diagnostic trouble code (DTC).
Continue - Checking accelerometer, continued
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Checking accelerometer, continued
- Accelerometer connected.
- Start the engine and idle it.
- Select Volvo Scan Tool (ST) to read off diagnostic trouble code (DTC).
Does the diagnostic trouble code (DTC) recur?
Yes - Replacing component
No - Fault-tracing information
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the accelerometer connector.
- Check connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Replacing component
- Try a new accelerometer.
Continue - Verification
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Checking power cable resistance to ground
- Ignition off.
- Accelerometer disconnected.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
Connect an ohmmeter between accelerometer connector terminal 1 and ground.
The ohmmeter should read 0.2 - 1.5 kohms.
OK - No Fault Found
Low - Car equipment level
High - Checking control module connector
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Car equipment level
The following options are available:
- 1. the car has air conditioning (A/C).
- 2. the car does not have air conditioning (A/C), but does have a leak diagnostic.
- 3. the car has neither air conditioning (A/C) or a leak diagnostic.
Select a suitable alternative.
1 - Checking the air conditioning (A/C) pressure sensor
2 - Checking fuel tank pressure sensor
3 - Checking for a short-circuit
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Checking control module connector
- Ignition off.
- Accelerometer 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 accelerometer connector terminal 1 and ground.
The ohmmeter should read approximately 0.2 - 1.5 kohms.
OK - Fault-tracing information
Not OK - Checking for an open-circuit
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Checking the air conditioning (A/C) pressure sensor
- Ignition off.
- Accelerometer disconnected.
- Disconnect the air conditioning (A/C) pressure sensor.
Connect an ohmmeter between accelerometer connector terminal 1 and ground.
The ohmmeter should read 0.2 - 1.5 kohms.
OK - Replacing component
Not OK - Car equipment level
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Car equipment level
Does the car have leak diagnosis?
Yes - Checking fuel tank pressure sensor
No - Checking for a short-circuit
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Checking fuel tank pressure sensor
- Ignition off.
- Accelerometer disconnected.
- Air conditioning (A/C) pressure sensor disconnected.
- Disconnect tank pressure sensor.
Connect an ohmmeter between accelerometer connector terminal 1 and ground.
The ohmmeter should read 0.2 - 1.5 kohms.
OK - Replacing component
Not OK - Checking atmospheric pressure sensor
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Checking atmospheric pressure sensor
- Ignition off.
- Accelerometer disconnected.
- Air conditioning (A/C) pressure sensor disconnected.
- Fuel tank pressure sensor disconnected.
- Disconnect atmospheric pressure sensor.
Connect an ohmmeter between accelerometer connector terminal 1 and ground.
The ohmmeter should read 0.2 - 1.5 kohms.
OK - Replacing component
Not OK - Checking for a short-circuit
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Replacing component
- Try a new atmospheric pressure sensor.
Continue - Verification
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Checking for a short-circuit
The accelerometer power cable is connected inside the engine control module (ECM) to the fuel tank pressure sensor, atmospheric pressure sensor and air conditioning (A/C) pressure sensor power cables. If anything happens to any of these cables all four will be affected. Air conditioning (A/C) pressure sensor wiring is pre-routed, even on cars without air conditioning, and should always be checked.
Check cables between:
- Accelerometer terminal 1 and engine control module (ECM) #B1.
- Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
- atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29
- tank pressure sensor terminal 1 and engine control module (ECM) #B15.
- for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking for an open-circuit
- Check cable between accelerometer terminal 1 and engine control module (ECM) #B1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Replacing component
- Try a new air conditioning (A/C) pressure sensor.
Continue - Verification
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Replacing component
- Try a new fuel tank pressure sensor.
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.
- Accelerometer and, if necessary, air conditioning (A/C) pressure sensor and fuel tank pressure sensor connected.
- Start the engine and idle it.
- Select Volvo Scan Tool (ST) to read off the value of the from the accelerometer.
The value should be approximately 2.5 V.
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 power cable
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