Part 5

Signal too low (Continued)

Checking TP sensor signal

Hint: TP sensor may break if the signal lead is short-circuited to supply.
Check sensor as below:

- Ignition off.
- Connect TP sensor.

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.

OK - TP sensor is correct.

Not OK - Try another TP sensor.

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Fault tracing information
TP sensor is correct.

Press Continue.

Continue - FAULT FOUND

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Verification

Verify

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
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 low. Permanent fault

4-1-1TP sensor signal

Checking the voltage lead

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

Note! Any fan overspin must be completed before resistance measurement can be done.

- Connect an ohmmeter between TP sensor connector 2 and ground.

The ohmmeter should show 0.4-0.6 kohms.

OK -

Low - Check the lead between the TP sensor connector 2 and control module #A15 for signs of short circuiting to ground as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

High -

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Checking for short-circuit

- Check the lead between the TP sensor connector 2 and control module #A15 for signs of short circuiting 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 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.
- ECM connected.
- Ignition on.

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

The voltmeter should show approx. 5 V.

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

Not OK - Check the lead between TP sensor connector 2 and ECM #A15 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's connector.

Press Continue.

Continue - FAULT FOUND

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Checking for open-circuit

- Check the lead between TP sensor connector 2 and ECM #A15 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 signal lead

- Ignition on.
- TP sensor disconnected.

- Connect a voltmeter between TP sensor connector 3 and ground.

The voltmeter should show approx. 5 V.

OK -

Not OK - Check the lead between TP sensor connector 3 and ECM #A16 for signs of short circuiting to ground as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Checking for open-circuit

- Check the lead between TP sensor connector 3 and ECM #A16 for signs of short circuiting 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 the TP sensor signal

- Ignition off.
- Connect the TP sensor.
- Start the engine.

- Read off the throttle angle.

Throttle angle should be 3 - 8° when the engine is at idling speed, increasing as the accelerator pedal is pressed down.

OK - The source of the DTC is poor contact in the TP sensor's connector. Rectify the connector with regard to contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Not OK - Test with a new TP sensor.

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Checking for contact resistance and oxidation
The source of the DTC is poor contact in the TP sensor's connector.
- Rectify the connector with regard to 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 -

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Replacement of component
- Test with a new TP sensor.

- Ignition off.
- Reconnect connectors, components etc.
- Start engine and let it run at idling speed.

- Read off the throttle angle.

Throttle angle should be 3-8° at CTP and 80°-90° at WOT.

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 low. Permanent fault

EFI-411 Throttle position (TP) sensor signal

Checking power cable

- Ignition off.
- Wait approximately 150 seconds (car 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 2 and ground.

The ohmmeter should read 0.4 - 0.8 kohms.

OK - Checking the signal cable

Low - Check cable between throttle position (TP) sensor terminal 2 and engine control module (ECM) #A15 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for a short-circuit

High - Checking control module connector

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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 ground 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.
- 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 2 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.
Fault-tracing information

Not OK - Check cable between throttle position (TP) sensor terminal 2 and engine control module (ECM) #A15 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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