Signal Too Low
Signal too low
Checking kickdown switch function
- Ignition on.
- Go into scrolling values.
- Read off kickdown switch position.
The reading should only be ON if the accelerator pedal (AP) is depressed to kickdown position. For other accelerator pedal (AP) positions the reading should be OFF.
Is the correct reading displayed?
Yes - Checking the kickdown switch (KD) and the throttle position (TP) sensor signal
No - Checking the kickdown switch (KD)
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Checking the kickdown switch (KD) and the throttle position (TP) sensor signal
- Ignition on.
- Go into scrolling values.
- Read off throttle position (TP) sensor and kickdown switch positions.
Depress the accelerator pedal (AP) to just before kickdown position. Check that the throttle position (TP) sensor position reads approximately 100 % open throttle.
Note! The kickdown switch should not be activated during the test, it should read OFF.
Is the value OK?
Yes - Intermittent fault
No - Adaptation of the throttle position (TP) sensor signal
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Checking the kickdown switch (KD)
When the accelerator pedal AP is fully depressed, the kickdown switch (KD) is pressed so that the circuit is closed. When the accelerator pedal (AP) is released, the switch springs back and breaks the circuit.
Is the function of the kickdown switch OK?
Yes - Checking kickdown switch resistance
No - Replacing the component
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Checking kickdown switch resistance
- Ignition off.
- Disconnect the kickdown switch.
Connect an ohmmeter between kickdown switch terminals 1 and 2.
Fully depress the kickdown switch (KD).
The ohmmeter should read approximately 0 ohms with the kickdown switch (KD) fully depressed and infinite resistance in the released position.
Is the correct reading displayed?
Yes - Checking for a short-circuit
No - Replacing the component
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Checking for a short-circuit
Check the cable between the kickdown switch:
- terminal 2 and control module terminal 18 (Fenix 5.1)
- terminal 2 and control module terminal 35 (EMS 2000)
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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Replacing the component
- Ignition off.
Try a new kickdown switch according to Replacing the kickdown switch (KD) .
Continue - Verification
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Adaptation of the throttle position (TP) sensor signal
Hint: If the control module has been replaced the throttle position (TP) signal must be adapted to match the new module. Failure to adapt the signal can result in diagnostic trouble code (DTC) AT-143 being stored.
Carry out adaptation of wide open throttle (WOT) position as follows:
- Ignition on.
- Fully depress the accelerator pedal (AP) so that the kickdown switch is activated.
- Keep the accelerator pedal (AP) fully depressed for 5 seconds.
- Release the accelerator pedal (AP).
Wide open throttle (WOT) position is now adapted.
Continue - Checking the throttle position (TP) sensor signal
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Checking the throttle position (TP) sensor signal
- Ignition on.
- Go into scrolling values.
- Read off throttle position (TP) sensor and kickdown switch positions.
Depress the accelerator pedal (AP) to just before kickdown position. Check that the throttle position (TP) sensor position reads approximately 100 % open throttle.
Note! The kickdown switch should not be activated during the test, it should read OFF.
Is the value OK?
Yes - Fault-tracing information
No - Checking the accelerator pedal (AP), throttle cable and throttle
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) was poor throttle position (TP) sensor signal adaptation.
Continue - FAULT FOUND
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Checking the accelerator pedal (AP), throttle cable and throttle
Check that the throttle is fully open when the accelerator pedal (AP) is depressed to kickdown position. Remedy as necessary.
Continue - Verification
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Verification
Verification
Hint: After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:
- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
- Go into scrolling values.
Read off the position of the throttle position (TP) sensor. Check that the throttle position (TP) sensor reads approximately 100 % open throttle.
Note! The kickdown switch should not be activated during the test, it should read OFF.
Is the value OK?
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
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 kickdown switch function
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Intermittent fault
Signal too low. Intermittent fault
Intermittent fault
- Check that neither the kickdown switch (KD) nor cable sleeve are sticking.
- Check the cable between the kickdown switch:
- terminal 2 and control module terminal 18 (Fenix 5.1)
- terminal 2 and control module terminal 35 (EMS 2000)
- for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking kickdown switch function
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