DTC 232

EAY. Code 2-3-2

2-3-2 Vehicle speed signal absent

DTC information

Conditions for DTC

The combined instrument supplies vehicle speed information to the transmission control module TCM. The signal is a variable-frequency uniform square wave where the frequency increases as the road speed increases. The TCM uses the signal to determine whether the transmission changes gear at the proper speeds. The TCM also uses the RPM sensor sensor to determine vehicle speed. If the TCM registers an excessive deviation in the vehicle speed signal from the combined instrument compared to the TCM calculated speed, DTC 2-3-2 is set.

Substitution value

Control Module GROUP I:
The transmission control module (TCM) "Emergency mode" program has been initiated.

Control Module GROUP II:

The transmission control module (TCM) "Emergency mode II" program is initiated.

Defect cause

- Break in signal wiring circuit
- Short circuit to supply or ground in the signal wiring.
- Malfunction in combined instrument
- Malfunction vehicle speed sensor VSS circuit.
- Contact resistance in connections.

Fault symptom

- Rough gear shifting due to maximum system pressure in the transmission
- No reduction of engine torque
- No Lock-Up operational.
- Fault-tracing starts with EAY1.

EAY1

Checking the speedometer

- Test drive the car
- Check that the speedometer is operating correctly

If the speedometer is OK:
- Checking the vehicle speed signal to the TCM EAY2.

If signals are incorrect:
- Fault-trace the combined instrument and vehicle speed sensor.

EAY2

Checking the vehicle speed signal to the TCM

- Activate Diagnostic Test Mode 5 Diagnostic Test Mode 5
- Test drive the car
- Read off the speed in DTM 5, compare with the speed on the speedometer.

If the readings are OK:
- Checking the vehicle speed sensor EAY9.

If reading is incorrect:
- Combined instrument VDO; Checking DTCs in the combined instrument EAY3.
- Combined instrument YAZAKI: Checking signal grounds EAY4.

EAY3

Checking DTCs in the combined instrument

- Ignition ON.

Check if DTC 1-2-3 is stored in the combined instrument (terminal 7 in the Data Link Connector DLC)

If DTC 1-2-3 is stored:
- Check the cable between the combined instrument #A6 and the TCM #48 (#B18) for short circuit to supply as per FA4. FA. Checking Wiring and Connections

- Cars with electronic climate control ECC: Also check the cable between the ECC control module #24 and the combined instrument #A6 for short circuit to supply as per FA4. FA. Checking Wiring and Connections

- Cars with trip computers: Check wiring between the combined instrument #D4 and the trip computer #4 for short circuit to supply as per FA4. FA. Checking Wiring and Connections

If DTC 1-2-3 is not stored:
- Checking signal grounds EAY4.

EAY4

Checking signal grounds

- Ignition OFF
- Expose the combined instrument.
- Plug measuring box into combined instrument.
- Connect test box to transmission control module TCM
- Disconnect combined instrument and TCM modules.

Cars with electronic climate control ECC:

- Disconnect ECC module.

Connect an ohmmeter between transmission test box #20 (#A20) and the combined instrument test box #15 (#A15).

The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Checking signal wiring resistance EAY5.

If reading is incorrect:
- Check ground point 31/33 and the cable between the ground point 31/33 and the TCM for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check ground point 31/51 and the cable between ground point 31/51 and the combination instrument #15 for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check the cable/connection between the ground points 31/51 and 31/33 for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections
Then continue with: Checking signal wiring resistance EAY5.

EAY5

Checking signal wiring resistance

- Ignition OFF
- Transmission control module TCM disconnected Connect an ohmmeter between transmission test box #48 (#B18) and the combination instrument test box #A6:

The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Check signal wiring resistance to ground EAY6.

If reading is incorrect:
- Check the cable between combination instrument terminal #A6 and the TCM #B18 for breaks in the circuit as per FA2. FA. Checking Wiring and Connections

EAY6

Checking signal wiring resistance to ground

Ignition OFF
- Transmission control module (TCM) disconnected
- Combined instrument connected
- ECC control module disconnected.

Use an ohmmeter to measure between #20 (#A20) and #48 (#B18) on the transmission test box.
The ohmmeter should read infinite resistance.

If reading is OK:
- Combined instrument VDO: Checking vehicle speed signal EAY8.

- Combined instrument YAZAKI: Checking signal wiring for short circuit to battery voltage EAY7

If reading is incorrect:
- Check the cable between the combined instrument #A6 and TCM #B18 for short circuit to ground as per FA3. FA. Checking Wiring and Connections

- Cars with electronic climate control ECC: Also check the cable between the ECC control module #A24 and the combined instrument #A6 for short circuit to supply as per FA4. FA. Checking Wiring and Connections

- Cars with trip computers: Check the cable between the combined instrument #D4 and trip computer #4 for short circuit to ground as per FA3. FA. Checking Wiring and Connections

EAY7

Checking signal wiring for short circuit to battery voltage

- Ignition OFF
- Connect the transmission control module (TCM)
- On cars with ECC, connect the ECC module
- Connect the combined instrument
- Set gearshift selector to position N
- Raise car so that front wheels hang free
- Ignition ON.

Use a voltmeter to measure between #20 (#A20) and #A48 (#B1B) on the transmission test box.

- Block one front wheel and spin the other rapidly. The voltmeter should register 4 - 7 V.

NOTE: When the rear wheels are stationary and the front wheels rotate a DTC can be stored in the ABS anti-lock braking system. Erase any DTCs set in the ABS system after fault-tracing.

If reading is OK:
- The DTC was set because of poor contact in the TCM or combined instrument connectors. Check and correct the connectors for contact resistance and oxidation as per FA6 FA. Checking Wiring and Connections

If reading is incorrect:
- Check wiring between combined instrument #A6 and TCM #B18 for short circuit to supply as per FA4. FA. Checking Wiring and Connections

- Cars with electronic climate control (ECC): Also check the cable between the ECC control module #A24 and the combined instrument #A6 for short circuit to supply as per FA4. FA. Checking Wiring and Connections

If the wiring is OK: Repeat test with new combination instrument.

EAY8

Checking vehicle speed signal

- Ignition OFF
- Connect the transmission control module TCM
- On cars with ECC, connect the ECC module
- Connect the combined instrument
- Gear selector in position N.
- Raise car so that front wheels hang free
- Ignition ON.

Use a voltmeter to measure between #20 (#A20) and #48 (#B18) on the transmission test box.

- Block one front wheel and spin the other rapidly. The voltmeter should register 4 - 7 V.

- Ignition OFF

Check that the vehicle speed sensor VSS is securely fastened to the transmission. Check that there is no dirt between the sensor and the mating surfaces. Check that the VSS is not damaged and is securely fastened in position.

If the VSS is OK:
- Checking signal grounds EAY1O.

If the VSS is not OK:
- Correct faults if any.

EAY1O

Checking signal grounds

- Ignition OFF
- Expose the combined instrument.
- Connect test box into combined instrument.
- Connect test box to transmission control module (TCM)
- Disconnect combined instrument and TCM modules.

Cars with electronic climate control (ECC):

- Disconnect the ECC module.

Connect an ohmmeter between transmission test box #20 (#A20) and the combined instrument test box #15 (#A15).

The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Checking wiring and connections EAY11.

If reading is incorrect:
- Check ground point 31/33 and the cable between the ground point 31/33 and the TCM for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check ground point 31/51 and the cable between ground point 31/51 and the combination instrument #15 for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check the cable/connection between the ground points 31/51 and 31/33 for breaks as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

Then continue with: Checking wiring and connections EAY11

EAY11

Checking wiring and connections

- Check the connector to the transmission control module (TCM) and the combined instrument connectors for loose connections as per FA5, and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check the vehicle speed sensor VSS connector for loose connections as per FA5, and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check the cable between the combined instrument connector terminal #A6 and the TCM #B18 for intermittent break as per FA2 and intermittent short circuit to supply as per FA4 and intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

- Cars with electronic climate control (ECC): Also check the cable between the ECC control module #A24 and the combined instrument #A6 for intermittent short circuit to supply as per FA4 and into intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

- Cars with trip computers: Check the cable between the combined instrument #D4 and trip computer #4 for intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

- Check the wiring between the VSS connector terminals 1 and 3 and the combined instrument #A3 and #A2 for intermittent break as per FA2, intermittent short circuit to supply as per FA4 and intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

If the connectors and wiring are OK:
- Repeat test with new vehicle speed sensor VSS