Part 4

Signal too high (Continued)

Verification

Hint: After repair, it is necessary to check that the fault has been corrected.
Perform as described below:

- Ignition off.
- Reconnect connectors, components etc.

Note! See Communication with control module Communication With Control Module for conditions regarding communication.

- Activate instrument, by selecting VST symbol.
- Ignition on.
- Read off TP sensor value.

Reading should be approx. 0.4 V at idling and increase to approx. 4.0 V at WOT. The reading should not at any time be approx. 0 V or exceed 4.8 V.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED -

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Troubleshooting 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 -

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FAULT FOUND - Verification

No Fault Found - Verification

FAULT-TRACING FAILED - Verification

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Signal too low. Permanent fault

Checking supply lead

- Switch on ignition.
- Disconnect throttle position sensor.

- Connect voltmeter across throttle position sensor connector terminals 1 and 2.

Instrument should indicate approx. 5 V.

OK -

Not OK - Check lead between throttle position sensor connector terminal 2 and MFI module #A2 for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Checking for open-circuit

- Check lead between throttle position sensor connector terminal 2 and MFI module #A2 for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Press Continue when fault is repaired.

Continue -

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Checking signal lead

- Switch on ignition.
- Disconnect throttle position sensor.

- Connect voltmeter across throttle position sensor contact terminals 1 and 3.

Instrument should indicate approx. 5 V.

OK -

Not OK - Check lead between throttle position sensor connector terminal 3 and MFI module #A1 for short-circuit to ground as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Checking for short-circuit

- Check lead between throttle position sensor connector terminal 3 and MFI module #A1 for short-circuit to ground as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Press Continue when fault is repaired.

Continue -

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Checking TP potentiometer signal

- Connect throttle position sensor (if disconnected).
- Start engine.

- Read value of throttle position sensor signal.

Value should be approx. 0.5 V at CTP (idling) and increase to approx. 4.2 V at WOT.

OK - DTC is due to poor connection in throttle position sensor connector. Check connector for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Not OK - Try with new throttle position sensor.

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Checking for contact resistance and oxidation
- DTC is due to poor connection in throttle position sensor connector. Check connector for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Press Continue when fault is repaired.

Continue - FAULT FOUND

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Replacement of component
- Try with new throttle position sensor.

Press Continue when fault is repaired.

Continue -

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Verification

Verify

Verification

Hint: After repair, it is necessary to check that the fault has been corrected. Check potentiometer signal as described below:

- Switch off ignition.
- Reconnect connectors, components etc.
- Start engine.

- Read value of sensor signal.

Value should be approx. 0.5 V at CTP (idling) and increase to approx. 4.2 V at WOT. Value is not allowed to be less than 0.25 V or exceed 4.75 V at any time.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED -

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Troubleshooting Information
Information
Attempt New Test -

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FAULT FOUND - Verification

No Fault Found - Verification

FAULT-TRACING FAILED - Verification

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Signal too high. Permanent fault

4-1-1TP sensor signal

Checking the ground lead

- Ignition off.
- Wait for approx. 150 seconds.
- Disconnect the TP sensor.

Note! If the engine cooling fan continues operating after engine switch-off, it must be allowed to finish before resistance measurements are taken.

- Connect an ohmmeter between TP sensor connector 1 and ground.

The ohmmeter should show approx. 0 ohms.

OK -

Not OK -

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Checking the ECM connector

- Ignition off.
- TP sensor disconnected.
- Rectify the ECM connector with regard to contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- The ECM connected.

- Connect an ohmmeter between TP sensor connector 1 and ground.

The ohmmeter should show approx. 0 ohms.

OK - The source of the DTC is poor contact in the ECM connector.

Not OK - Check the lead between TP sensor connector 1 and ECM #A18 for signs of a break as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Fault tracing information
The source of the DTC is poor contact in the ECM connector.

Press Continue.

Continue - FAULT FOUND

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Checking for open-circuit

- Check the lead between TP sensor connector 1 and ECM #A18 for signs of a break as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Press Continue when fault is repaired.

Continue -

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Checking the voltage lead

- Ignition on.
- TP sensor disconnected.

- Connect a voltmeter between the TP sensor's connector 2 and ground.

The voltmeter should show approx. 5 V.

OK -

Not OK - Check the lead between the TP sensor connector 2 and control module #A15 for signs of a short circuit to voltage supply as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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