CI-123 48 Pulse Vehicle Speed Signal

Condition:

Speedometer:

- The diagnostic trouble code (DTC) is stored within 2 seconds when there is a short-circuit to supply voltage in the signal and speed is > 2 km/h (1.2 mph).

Possible Source:
- There is a short-circuit to supply voltage in the speed signal cable between the combined instrument panel and
- ECC (Electronic Climate Control).
- Trip computer.

Fault Symptom(s):

NOTE: The combined instrument panel may displays visible symptoms of this diagnostic trouble code (DTC).

- In cars with ECC, blower fan speed does not drop with increasing speed.
- In cars equipped with a trip computer, incorrect values for average speed, average fuel consumption, actual fuel consumption and trip computer trip odometer are displayed.

Start fault-tracing with step 1, below.

1) Status Check:
- Gear selector in neutral.
- Lift up the front suspension so that both front wheels are hanging free.

WARNING: In cars with AWD, lift up the car so that all wheels are hanging free.

Ignition On:

- Ignition on.

- Go into scrolling values.

- Check cable to combined instrument panel # D8 for a short-circuit to supply voltage.
- On cars with ECC: Check cable between combined instrument panel # A6 and ECC control module # A24 for a short-circuit to supply voltage.
- Permanent Fault
- Then continue with step 3, below.

3) Verification:

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

- Ignition off.

Connect Connector:

- Reconnect connectors, reinstall components.
- Gear selector in neutral.
- Lift up the front suspension so that both front wheels are hanging free.

WARNING: In cars with AWD, lift up the car so that all wheels are hanging free.

Ignition On:

- Ignition on.

- Go into scrolling values.

- Spin the front wheel so that speed exceeds 2 km/h (1.2 mph) for at least 2 seconds while reading off the status of the 48 pulse vehicle speed signal.
- Is the status OK displayed?

Yes: Fault corrected
No: Go to step 4, below.

4) Fault-Tracing Information:
- The verification result shows that the fault persists. Do you want to quit fault-tracing?

Yes: Fault not corrected
No: Go back to step 1, above,

5) Faulty Signal, Intermittent Fault:

- Check cable to combined instrument panel # D8 for an intermittent short-circuit to supply voltage.
- On cars with ECC: Check cable between combined instrument panel # A6 and ECC control module # A24 for an intermittent short-circuit to supply voltage.
- To perform above stated checks, Intermittent Fault
- Then continue with step 6, below.

6) Fault-Tracing Information:
- For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.
- Do you want to repeat fault-tracing?

Yes: Go back to step 1, above.
No: Operation done