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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 27

DTC 27









CIRCUIT OPERATION
- A system voltage is applied to the park/neutral position switch (terminal 7) when the ignition switch is turned "ON."
- A system voltage is applied to the PCM (terminal 101) when the selector lever is in the "P" range. The PCM judges that the selector lever is in the "P" range when the system voltage is applied.
- A system voltage is applied to the PCM [terminals 108, 121, 102, 109, 122 or 110] when the selector lever is in the "R" range ("N", "D", "3", "2" or "L" range). The PCM judges that the selector lever is in the "R" range ("N", "D", "3", "2" or "L" range) when the system voltage is applied.

DTC SET CONDITIONS
- If the PCM detects no park/neutral position switch input signal from any selector position for continuous period of thirty seconds, it is judged that there is an open circuit in the park/neutral position switch and diagnostic trouble code number "27" is output. If the PCM detects more than one kind of park/neutral position switch input signals for continuous period of thirty seconds, it is judged that there is a short circuit in the park/neutral position switch and diagnostic trouble code number "28" is output.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Malfunction of the Park/Neutral position switch
- Malfunction of the ignition switch
- Damaged connector
- Malfunction of the PCM

DIAGNOSIS





Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to the scan tool MB9911502, make sure the ignition switch is "OFF" before connecting or disconnecting the scan tool MB991502.

STEP 1. Using scan tool M113991502,``` check data list item 61: Park/Neutral position switch.
- Display should be the same as the actual selector lever position.
If the Park/Neutral position switch is operating properly, this malfunction can be intermittent. Refer to How to Use Troubleshooting/Inspection Service Points.
If the Park/Neutral position switch is not operating properly, go to Step 2.

STEP 2. Check the Park/Neutral position switch.








Check for continuity between terminals for each selector position.
If the Park/Neutral position switch meets the specifications above, go to Step 3.
If the Park/Neutral position switch does not meet the specifications above, replace the Park/Neutral position switch. Recheck for DTCs.

STEP 3. Check the power supply circuit at the Park/Neutral position switch.





1. Disconnect connector B-01.
2. Turn the ignition switch "ON."
3. Measure the voltage between terminal 7 (harness side) and ground.
- Voltage should be system voltage.
If not within the system voltage, go to Step 4.
If within the system voltage, go to Step 7.

STEP 4. Check harness connector B-01 at the Park/Neutral position switch for damage.





If harness connector B-01 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector B-01 is in good condition, go to Step 5.

STEP 5. Check harness connector D-08 at the junction block 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 6.

STEP 6. Check the harness wires between junction block connector D-08 and Park/Neutral position switch connector B-01.





NOTE: After inspecting intermediate connectors C-30 and D-13, inspect the wire. If intermediate connectors C-30 and D-13 are damaged, repair or replace them. Refer to Harness Connector Inspection.





If any harness wires between junction block connector D-08 and Park/Neutral position switch connector B-01 are damaged, repair them. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wires are in good condition, recheck for DTCs.
If the malfunction is not eliminated, check the power distribution. Refer to Power Distribution. After checking, recheck for DTCs.

STEP 7. Check harness connector B-01 at the Park/Neutral position switch sensor for damage.





If harness connector B-01 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector B-01 is in good condition, go to Step 8.

STEP 8 Check harness connector C-92 at the PCM for damage.





If harness connector C-92 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector C-92 is in good condition, go to Step 9.

STEP 9. Check the harness wires between PCM connector C-92 and Park/Neutral position switch connector B-01.





NOTE: After inspecting intermediate connector C-96, inspect the wire. If intermediate connector C-96 is damaged, repair or replace it Refer to Harness Connector Inspection.





If any harness wires between PCM connector C-92 and Park/Neutral position switch connector B-01 are damaged, repair them. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wires are in good condition, recheck for DTCs.
If the malfunction is not eliminated, replace the PCM.


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