Checking Speed Signal From Combined Instrument Panel

Checking speed signal from combined instrument panel

Checking speed signal from combined instrument panel




Hint: An alternative to the following method is to drive the car on the road.

Ignition off
- Raise car so that front wheels rotate freely. For AWD cars, all the wheels.
- Remove wheels.
- Engine idling
- Select a gear so the wheels begin turning.
- Read off the vehicle speed signal.
Check vehicle speed signal
If the speedometer is malfunctioning then carry out fault-tracing on the combined instrument panel first.

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) can be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Note! For automatic transmissions, make sure the wheels are not moving when the gear selector is moved.





Does the vehicle speed signal reading agree with the speedometer?

Yes - No Fault Found

No - Checking cables

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Checking cables
Check the ECC control module and combined instrument panel connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check signal cable between ECC control module #B1 and combined instrument panel # A6 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Corrective action as necessary.
Other information.
To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
To access the combined instrument panel, refer to Replacing the combined instrument panel Replacing the Combined Instrument Panel.
To remove the control module, refer to Replacing ECC control module Removal and Replacement.










Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








Hint: An alternative to the following method is to drive the car on the road.

Ignition off
- Raise car so that front wheels rotate freely. For AWD cars, all the wheels.
- Remove wheels.
- Engine idling
- Select a gear so the wheels begin turning.
- Read off the vehicle speed signal.
Check vehicle speed signal
If the speedometer is malfunctioning then carry out fault-tracing on the combined instrument panel first.

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) can be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Note! For automatic transmissions, make sure the wheels are not moving when the gear selector is moved.





Does the vehicle speed signal reading agree with the speedometer?

Yes - FAULT FOUND

No - 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 speed signal from combined instrument panel

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