Part 3

Signal too low (Continued)

Verification

Hint: After repairs have been completed they must be verified as follows to ensure the fault has been eliminated:

- Ignition off
- Wait approx. 10 seconds.
- Ignition on.
- Wait approx. 15 seconds.
Read off the status of the Diagnostic trouble code (DTC).

Does the status indicate INTERMITTENT FAULT?

Yes - VERIFIED

No - 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 - Status message

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Intermittent fault

Signal too low. Intermittent fault

Intermittent fault

- Ignition off.
- Check transmission control module (TCM) and engine control module (ECM) connectors for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between transmission control module (TCM) #B20 and engine control module (ECM) #B20 (Fenix 5.2, LH 3.2, Motronic 4.3 or Motronic 4.4) for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- On cars with engine control module (ECM) type LH 3.2/EZ129K, also check the cable between engine control module (ECM) LH 3.2 #B20 and EZ129K #B20 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check ground terminal 31/33 for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Select "Continue" when the fault has been repaired.

Continue - Checking throttle position (TP) sensor circuit

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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 - Signal faulty. Permanent fault - 2-4-3 TP sensor signal

LH 3.2 - Signal too low. Permanent fault - Checking supply lead

Motronic 4.3 - Signal too low. Permanent fault - 4-1-1 TP sensor signal

Motronic 4.4 - Signal too low. Permanent fault - EFI-411 Throttle position (TP) sensor signal

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Signal faulty. Intermittent fault

2-4-3 TP sensor signal

Checking leads and connections
- Check TP sensor and control module connectors for loose contacts as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check lead between #A15 and connector terminal 2 for intermittent open circuit as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , intermittent short-circuit to ground as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and intermittent short circuit to supply as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check lead between #A16 and connector terminal 3 for intermittent open circuit as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , intermittent short-circuit to ground as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and intermittent short circuit to supply as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

- Check lead between #A18 and connector terminal 1 for intermittent open circuit as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Press Continue when fault is repaired.

Continue -

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Troubleshooting information
Information
Attempt New Test -

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FAULT FOUND - Fault-tracing information

No Fault Found - Fault-tracing information

FAULT-TRACING FAILED - Fault-tracing information

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Signal too low. Intermittent fault

Checking wiring and connections

- Check lead between throttle position sensor connector terminal 3 and MFI module #A1 for intermittent short-circuit to ground as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check lead between throttle position sensor connector terminal 2 and MFI module #A2 for intermittent open-circuit as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

- Check the TP sensor's and ECM's connectors for signs of loose connection as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults as well as contact resistance and oxidation as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check the lead between TP sensor connector 3 and ECM #A16 for signs of intermittent short circuiting to ground as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check the lead between TP sensor connector 2 and ECM #A15 for signs of an intermittent break as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and intermittent short circuiting to ground as per Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

- Check throttle position (TP) sensor and engine control module (ECM) connectors for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between throttle position (TP) sensor terminal 3 and control module #A16 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between throttle position (TP) sensor terminal 2 and engine control module (ECM) #A15 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Continue - Fault-tracing information
Fault-tracing information

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Fault-tracing information
Information
Attempt New Test - Checking cables and terminals

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FAULT FOUND - Fault-tracing information

No Fault Found - Fault-tracing information

FAULT-TRACING FAILED - Fault-tracing information

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Fault-tracing information
Information

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Attempt New Test - Status message

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