Signal Too High. Permanent Fault

Signal too high. Permanent fault

EFI-411 Throttle position (TP) sensor signal

Checking ground lead








- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Disconnect throttle position (TP) sensor.

Note! If the engine cooling fan runs on, it must be allowed to stop before taking resistance readings.

Connect an ohmmeter between throttle position (TP) sensor connector terminal 1 and ground.









The ohmmeter should read approximately 0 ohms.

OK - Checking power cable

Not OK - Checking control module connector

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Checking control module connector












- Ignition off.
- Throttle position (TP) 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 throttle position (TP) sensor connector terminal 1 and ground.









The ohmmeter should read approximately 0 ohms.

OK - The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector. Then continue with Verification.
Fault-tracing information

Not OK - Check cable between throttle position (TP) sensor terminal 1 and engine control module (ECM) #A18 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
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 - Verification

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Checking for an open-circuit








- Check cable between throttle position (TP) sensor terminal 1 and engine control module (ECM) #A18 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 power cable








- Ignition on.
- Throttle position (TP) sensor disconnected.
Connect a voltmeter between throttle position (TP) sensor connector terminal 2 and ground.









The voltmeter should read approximately 5 V.

OK - Checking the signal cable

Not OK - Check cable between throttle position (TP) sensor terminal 2 and engine control module (ECM) #A15 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for a short-circuit

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Checking for a short-circuit








- Check cable between throttle position (TP) sensor terminal 2 and engine control module (ECM) #A15 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 the signal cable








- Ignition on.
- Throttle position (TP) sensor disconnected.
Connect a voltmeter between throttle position (TP) sensor connector terminal 3 and ground.









The voltmeter should read approximately 5 V.

OK - Checking throttle position (TP) sensor signal

Low - Checking control module connector

High - Checking for a short-circuit

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Checking for a short-circuit








- Check cable between throttle position (TP) sensor terminal 3 and control module #A16 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Checking the throttle position TP sensor

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Checking control module connector












- Ignition off.
- Throttle position (TP) 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.
- Ignition on.
Connect a voltmeter between throttle position (TP) sensor connector terminal 3 and ground.









The voltmeter should read approximately 5 V.

OK - The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector. Then continue with Verification.
Fault-tracing information

Not OK - Check cable between throttle position (TP) sensor terminal 3 and control module #A16 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
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.
- 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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Checking for an open-circuit








- Check cable between throttle position (TP) sensor terminal 3 and control module #A16 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 throttle position (TP) sensor signal








- Ignition off.
- Connect throttle position (TP) sensor.
- Start the engine and idle it.
- Select Volvo Scan Tool (ST) to read off the throttle angle.





The throttle angle should be 0° when the engine is idling and should increase as the accelerator pedal (AP) is depressed.

OK - The cause of the diagnostic trouble code (DTC) has been loose connections in the throttle position (TP) 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. Then continue with Verification.
Checking for contact resistance and oxidation

Not OK - Try a new throttle position (TP) sensor. Then continue with Verification.
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 throttle position (TP) 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.

Continue - Verification

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Replacing component
- Try a new throttle position (TP) sensor.





Continue - Verification

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Checking the throttle position TP sensor








- The throttle position (TP) sensor may fail if there has been a short-circuit to supply voltage in the signal cable. Check throttle position (TP) sensor as follows.
- Ignition off.
- Connect throttle position (TP) sensor.
- Start the engine and idle it.
- Select Volvo Scan Tool (ST) to read off the throttle angle.





The throttle angle should be 0° when the engine is idling and should increase as the accelerator pedal (AP) is depressed.

OK - Throttle position (TP) sensor is OK.
Fault-tracing information

Not OK - Try a new throttle position (TP) sensor. Then continue with Verification.
Replacing component

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Fault-tracing information
Throttle position (TP) sensor is OK.

Continue - FAULT FOUND

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Replacing component
- Try a new throttle position (TP) 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.
- Throttle position (TP) sensor and engine control module (ECM) connected.
- Ignition on.
- Select Volvo Scan Tool (ST) to read off the value of the throttle position (TP) sensor.





At closed throttle position (CTP) voltage should exceed 0.1 V, at wide open throttle (WOT) voltage should be below 4.9 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 ground lead

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