Part 5
Signal too low (Continued)
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 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.
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
Not OK - Check cable between throttle position (TP) sensor terminal 3 and control module #A16 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 an open-circuit
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Checking for an open-circuit
- Check cable between throttle position (TP) sensor terminal 3 and control module #A16 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 throttle position (TP) sensor signal
- Ignition off.
- Connect throttle position (TP) sensor.
- Start engine.
- 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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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
Attempt New Test - Checking power cable
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FAULT FOUND - Verification
No Fault Found - Verification
FAULT-TRACING FAILED - Verification
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Checking throttle position (TP) sensor circuit
Further fault-tracing depends on the vehicle's engine control module (ECM).
Select control module.
Fenix 5.2 - Connecting up the Test box to fenix 5.2
LH 3.2 - Connection of test box to MFI module
Motronic 4.3 - Connecting up the Test box to Motronic 4.3
Motronic 4.4 - Connecting the breakout box
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Connection of test box, MFI
981 3195 ADAPTOR 981 3195 Adaptor 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connection of test box to MFI module
Is test box connected to MFI module?
Yes - No Fault Found
No -
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Connection of test box to MFI module
- Switch off ignition.
- Disconnect MFI module.
- Plug adapter 981 3195 ADAPTOR 981 3195 Adaptor into MFI module connector.
- Connect test box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to adapter.
Press Continue.
Continue -
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Checking ground terminals
- Switch off ignition
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance
- between #A20 (A20) on test box and battery negative terminal, and
- between #A29 (A29) on test box and battery negative terminal.
Instrument should indicate approx. 0 ohms in both cases.
OK - Resume fault tracing at point of interruption.
No Fault Found
Not OK - Check ground terminals 31/32 and 31/33 on engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for contact resistance as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.Check ground lead between engine and chassis for open- circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for contact resistance as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
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Checking for open-circuit
- Check ground terminals 31/32 and 31/33 on engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for contact resistance as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check ground lead between engine and chassis for open- circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for contact resistance 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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Verification
Hint: After repair, it is necessary to check that the fault has been corrected as described below:
- Switch off ignition
- Reconnect connectors.
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance
- between #A20 (A20) on test box and battery negative terminal, and
- between #A29 (A29) on test box and battery negative terminal.
Instrument should indicate approx. 0 ohms in both cases.
OK - FAULT FOUND
Not OK -
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Troubleshooting Information
Information
Attempt New Test -
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FAULT FOUND - Checking signal cable resistance to ground
No Fault Found - Checking signal cable resistance to ground
FAULT-TRACING FAILED - Checking signal cable resistance to ground
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Connector A
951 1351 ADAPTOR 86-PIN 951 1351 Adaptor 86-Pin 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connecting up the Test box to Motronic 4.3
Is the test box connected to the control module?
Yes - FAULT FOUND
No -
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Connection of break-out box to connector A (black)
- Switch off ignition.
- Disconnect ECM.
Note! The ECM must not be removed from the car until the main relay has interrupted the supply. This may take up to 150 seconds after the ignition has been switched off.
- Plug adapter 951 1351 ADAPTOR 86-PIN 951 1351 Adaptor 86-Pin into ECM base and connect break-out box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to adapter.
Press Continue.
Continue -
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Checking ground terminals
- Switch off ignition.
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance between battery negative terminal and
- #13 (#A13) on break-out box
- #28 (#A28) on break-out box
- #42 (#A42) on break-out box
Instrument should indicate approx. 0 ohms in all cases.
OK - Resume fault tracing at point of interruption.
No Fault Found
Not OK - Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.Check ground lead between engine and chassis for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
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Checking for open-circuit, contact resistance and oxidation
- Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check ground lead between engine and chassis for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and 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 -
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Verification
Hint: After repair, it is necessary to check that the fault has been corrected.
Perform as described below.
- Switch off ignition.
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance between battery negative terminal and
- #13 (#A13) on break-out box
- #28 (#A28) on break-out box
- #42 (#A42) on break-out box
Instrument should indicate approx. 0 ohms in all cases.
OK - FAULT FOUND
Not OK -
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Troubleshooting Information
Information
Attempt New Test -
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FAULT FOUND - Checking signal cable resistance to ground
No Fault Found - Checking signal cable resistance to ground
FAULT-TRACING FAILED - Checking signal cable resistance to ground
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Connecting breakout box, connector A
Connecting the breakout box
Is the breakout box connected to the Motronic 4.4 connector?
Yes - No Fault Found
No - Connecting breakout box to Motronic 4.4 connector A (black)
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Connecting breakout box to Motronic 4.4 connector A (black)
- Ignition off.
- Disconnect control module.
Note! The engine control module (ECM) must not be removed from the car until the main relay has interrupted its power supply. This may take up to 150 seconds (cars with an immobilizer 245 seconds) after the ignition has been switched off.
Connect adapter 951 1351 ADAPTOR 86-PIN 951 1351 Adaptor 86-Pin to engine control module (ECM) connector and connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to adapter.
Continue - Checking ground terminals
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Checking ground terminals
- Ignition off.
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
Connect an ohmmeter between battery negative terminal and:
- #13 (#A13) on the breakout box.
- #28 (#A28) on the breakout box.
- #42 (#A42) on the breakout box.
The ohmmeter should read approximately 0 ohms for all readings.
OK - Reading is OK
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check ground terminals 31/32 and 31/33 at rear of engine and their cables for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check ground lead between engine and chassis for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - No Fault Found
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Reading is OK
- Return to the fault-tracing procedure where it was interrupted.
Continue - No Fault Found
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FAULT FOUND - Checking signal cable resistance to ground
No Fault Found - Checking signal cable resistance to ground
FAULT-TRACING FAILED - Checking signal cable resistance to ground
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Checking throttle position (TP) sensor circuit
Further fault-tracing depends on the vehicle's engine control module (ECM).
Select control module.
- Fenix 5.2 - diagnostic trouble code (DTC) EFI-243 Throttle position (TP) sensor signal, permanent fault, signal faulty
- LH 3.2 - Throttle position (TP) sensor signal, permanent fault, signal too low
- Motronic 4.3 - diagnostic trouble code (DTC) EFI-411 Throttle position (TP) sensor signal, permanent fault, signal too low
- Motronic 4.4 - diagnostic trouble code (DTC) EFI-411 Throttle position (TP) sensor signal, permanent fault, signal too low
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Connection of test box, MFI
CONNECTED - Checking voltage drop over the engine control module (ECM) signal ground
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Connector A
CONNECTED - Checking voltage drop over the engine control module (ECM) signal ground
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Connecting breakout box, connector A
CONNECTED - Checking voltage drop over the engine control module (ECM) signal ground
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