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Home >> Mitsubishi Truck >> 2000 >> Montero Sport LS 2WD V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Transmission Control System >> DTC 29

DTC 29









CIRCUIT OPERATION
- A 5 volts voltage is applied to the vehicle speed sensor output terminal (terminal 3) from the PCM (terminal 80). The vehicle speed sensor generates a pulse signal when the output terminal is opened and ground.
- The PCM compares the vehicle speed sensor signal to input shaft and output shaft speed sensor signals.
- If the vehicle speed sensor becomes inoperative, the transmission will not shift normally.

DTC SET CONDITIONS
If the PCM detects no pulse signal from the vehicle speed sensor for continuous period of thirty seconds under following conditions, it is judged as a vehicle sensor system malfunction and DTC number "29" is displayed.
- Driving forward
- Output shaft speed is 900 r/min or more

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the vehicle speed sensor circuit
- Damaged connector
- Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the vehicle speed sensor.
Check the vehicle speed sensor. Refer to Combination Meters.
If the vehicle speed sensor is operating properly, go to Step 2.
If the vehicle speed sensor is not operating properly, replace it.

STEP 2. Check the vehicle speed sensor power supply circuit.





1. Disconnect harness connector B-09 and measure at the harness side.
2. Turn the ignition switch "ON."
3. Measure the voltage between terminal 1 and ground.
- Voltage should be system voltage.
If system voltage, go to Step 3.
If not system voltage, go to Step 8.

STEP 3. Check the vehicle speed sensor signal circuit.





1. Disconnect harness connector B-09 and measure at the harness side.
2. Turn the ignition switch "ON."
3. Measure the voltage between terminal 3 and ground.
- Voltage should be approximately 4.8 - 5.2 volts.
If 4.8 - 5.2 volts, go to Step 4.
If not 4.8 - 5.2 volts, go to Step 10.

STEP 4. Check the vehicle speed sensor ground circuit.





1. Disconnect harness connector B-09 and measure at the harness side.
2. Turn the ignition switch "OFF."
3. Check for the continuity between terminal 2 and ground.
- There should be continuity (0 Ohms).
If continuity, go to step 5.
If no continuity, go to Step 12.

STEP 5. Check the harness connector B-09 at the vehicle speed sensor for damage.





If the harness connector B-09 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness connector B-09 is in good condition, go to Step 6.

STEP 6. Check the harness connector C-91 at the PCM for damage.





If the harness connector C-91 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness connector C-91 is in good condition, go to Step 7.

STEP 7. Check the harness wire between vehicle speed sensor connector B-09 and PCM connector C-91.





NOTE: After inspecting intermediate connectors C-16 and C-29, inspect the wire. If intermediate connectors C-16 and C-29 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If any harness wire between vehicle speed sensor connector B-09 and PCM connector C-91 is damaged, repair it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wire is in good condition, recheck for DTCs.
If the symptom is not eliminated, replace the PCM.

STEP 8. Check the harness connector D-08 for damage.





If harness connector D-08 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector D-08 is in good condition, go to Step 9.

STEP 9. Check the harness wire between vehicle speed sensor connector B-09 and harness connector D-08.





NOTE: After inspecting intermediate connectors C-29 and D-06, inspect the wire. If intermediate connectors C-29 and D-06 are damaged, repair or replace them. Refer to Harness Connector Inspection.





If any harness wire between vehicle speed sensor connector B-09 and harness connector D-08 is damaged, repair it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wire is in good condition, check the malfunction.
If the malfunction is not eliminated, check the power distribution. Refer to Power Distribution. After check, recheck for DTCs.

STEP 10. Check the harness connector C-91 at the PCM for damage.





If the harness connector C-91 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector C-91 is in good condition, go to Step 11.

STEP 11.Check the harness wire between vehicle speed sensor connector B-09 and PCM connector C-91.





NOTE: After inspecting intermediate connector C-29, inspect the wire. If intermediate connector C-29 is damaged, repair or replace it Refer to Harness Connector Inspection.

It any harness wire between vehicle speed sensor connector B-09 and PCM connector C-91 is damaged, repair it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wire is in good condition, recheck for DTCs.
If the malfunction is not eliminated, replace the PCM.

STEP 12. Check the harness wire between vehicle speed sensor connector B-09 and ground.





NOTE: After inspecting intermediate connector C-29, inspect the wire. If intermediate connector C-29 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If any harness wire between vehicle speed sensor connector B-09 and ground is damaged, repair it. Refer to Harness Connector Inspection. Then check the malfunction.


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