Signal Missing

Checking Transmission Speed Signal
An alternative to the following method is to drive the car on the road.

- Ignition OFF.
- Raise car so that rear wheels rotate freely.
- Engine idling.
- Go into scrolling values.
- Read off transmission input speed.
- Move the gear selector to position D so the rear wheels begin to rotate.
- Check that the transmission input speed is updated. The transmission input speed should increase with engine speed.

NOTE:
- When the front wheels are stationary and the rear wheels rotate diagnostic trouble codes (DTCs) may can be stored in the ABS system. Erase any diagnostic trouble codes stored in the ABS system after fault-tracing.
- Ensure that the rear wheels are not rotating when the gear shift lever is moved.

- Is the transmission input speed OK?

Yes:
- Proceed to: Intermittent Fault section below.

No:
- Proceed to: Connecting The Test Box section below.





Connecting The Test Box
- Ignition OFF.
- Connect the test box and check ground terminals.
- Proceed to: Checking Transmission Speed Sensor Circuit section below.





Checking Transmission Speed Sensor Circuit
- Ignition OFF.
- Engine control module (ECM) disconnected.
- Connect an ohmmeter between # 37 and # 22 on test box.
- The ohmmeter should read 300-600 Ohms.

If reading is OK:
- Proceed to: Checking Signal Cables section below.

If reading is incorrect:
- Proceed to: Checking Transmission Speed Sensor Resistance section below.





Checking Transmission Speed Sensor Resistance
- Ignition OFF.
- Raise the car to access the transmission.
- Carefully clean round connector B.
- Disconnect transmission connector S.
- Connect an ohmmeter between transmission connector B, terminals 1 and 2 (transmission side).
- The ohmmeter should read 300-600 Ohms.

If reading is OK:
- Proceed to: Checking Resistance In Signal Cable (+) section below.

If reading is incorrect:
- Proceed to: Checking For Open-circuit And Replacement Of Component section below.





Checking For Open-circuit And Replacement Of Component
- Ignition OFF.
- Check cables between transmission speed sensor and transmission connector B terminals 1 and 2 for an open-circuit and a short circuit to each other.
- If the wiring is OK, try a new transmission speed sensor.
- Proceed to: Verification section below.





Checking Resistance In Signal Cable (+)
- Ignition OFF.
- Transmission connector B disconnected.
- Engine control module disconnected.
- Connect an ohmmeter between transmission connector B terminal 1 and # 37 on the test box.
- The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Proceed to: Checking Resistance In Signal Cable (-) section below.

If reading Is incorrect:
- Proceed to: Checking For An Open-circuit section below.





Checking For An Open-circuit
- Check cable between transmission connector B terminal 1 and transmission control module (TCM) # 37 for an open-circuit.
- Proceed to: Verification section below.





Checking Resistance In Signal Cable (-)
- Ignition OFF.
- Transmission connector B disconnected.
- Engine control module disconnected.
- Connect an ohmmeter between transmission connector B terminal 2 and # 22 on the test box.
- The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Proceed to: Checking Signal Wiring Resistance section below.

If reading is incorrect:
- Proceed to: Checking For An Open-circuit section below.





Checking For An Open-circuit
- Check cable between transmission connector B terminal 2 and transmission control module # 22 for an open-circuit.
- Proceed to: Verification section below.





Checking Signal Wiring Resistance
- Ignition OFF.
- Transmission connector B disconnected.
- Engine control module disconnected.
- Connect an ohmmeter between # 37 and # 22 on test box.
- The ohmmeter should read infinite resistance.

If reading is OK:
- Proceed to: Checking For Contact Resistance And Oxidation section below.

If reading is incorrect:
- Proceed to: Checking For A Short-circuit section below.





Checking For Contact Resistance And Oxidation
- Ignition OFF.
- The diagnostic trouble code was caused by loose connections in the transmission control module and transmission connectors. Check connectors for contact resistance and oxidation and remedy.
- Proceed to: Verification section below.





Checking For A Short-circuit
- Check cable between transmission connector B terminal 1 and transmission control module # 37 for a short-circuit to the cable between transmission connector B terminal 2 and transmission control module # 22.
- Proceed to: Verification section below.





Checking Signal Cables
- Ignition OFF.
- Test box connected.
- Connect transmission control module.
- Ignition ON.
- Connect a voltmeter between # 37 and # 15 on the test box.
- The voltmeter should read approx. 2.5 Volts.

If reading is OK:
- Proceed to: Checking For Contact Resistance And Oxidation section below.

If value is lower:
- Proceed to: Checking For A Short-circuit section below.

If value is higher:
- Proceed to: Checking For A Short-circuit 3 sections below.





Checking For Contact Resistance And Oxidation
- Ignition OFF.
- The diagnostic trouble code was caused by loose connections in the transmission control module connector. Check transmission and transmission control module connectors for contact resistance and oxidation and remedy.
- Proceed to: Verification section below.





Checking For A Short-circuit
- Check cables between transmission speed sensor and transmission control module # 37 and # 22 for a short circuit to ground.
- Proceed to: Verification section below.





Checking For A Short-circuit
- Check cables between transmission speed sensor and transmission control module # 37 and # 22 for a short-circuit to supply voltage.
- Proceed to: Verification section below.





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

- An alternative to the following method is to drive the car on the road.
- Ignition OFF.
- Reconnect connectors, reinstall components etc.
- Raise car so that rear wheels rotate freely.
- Engine idling.
- Go into scrolling values.
- Read off transmission input speed.
- Move the gear selector to position D so the rear wheels begin to rotate.

- Check that the transmission input speed is updated. The transmission input speed should increase with engine speed.

NOTE:
- When the front wheels are stationary and the rear wheels rotate diagnostic trouble codes may can be stored in the ABS system. Erase any diagnostic trouble codes stored in the ABS system after fault-tracing
- Ensure that the rear wheels are not rotating when the gear shift lever is moved.

- Is the transmission input speed OK?

Yes:
- Fault corrected.

No:
- Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
- Fault not corrected.

No:
- Proceed to: Checking Transmission Speed Signal section above.





Intermittent Fault
- Ignition OFF.
- Check transmission connector and transmission control module connector for loose connections and contact resistance and oxidation according.
- Check cables between transmission speed sensor and transmission control module # 37 and # 22 for an intermittent open-circuit, intermittent short-circuit to ground and an intermittent short-circuit to supply voltage.
- Check cables between the transmission speed sensor and transmission control module # A37 and # 22 for an intermittent short-circuit to each other.
- Proceed to: Fault-tracing Information section below.

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:
- Proceed to: Checking Transmission Speed Signal section above.

No:
- Operation done.