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Home >> Mitsubishi >> 2002 >> Lancer O-Z Rally Edition L4-2.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Transmission Control System >> DTC 28

DTC 28

DTC 28: Park/Neutral Position Switch System (Short Circuit)









CIRCUIT OPERATION
^ Battery positive voltage is applied to the Park/Neutral position switch (terminal 8) when the ignition switch is turned "ON."
^ Battery positive voltage is applied to the PCM (terminal 101) when the selector lever is in the lip l range. The PCM judges that the selector lever is in the "P" range when the battery positive voltage is applied.
^ Battery positive voltage is applied to the PCM terminal 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 battery positive voltage is applied.

DTC SET CONDITIONS
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" set?

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 harness, connector
^ Malfunction of the PCM

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 harness, connector
^ Malfunction of the PCM

DIAGNOSIS

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











STEP 1. Check the Park/Neutral position switch. Check for continuity between terminals for each selector position.
Q: Is the switch operating properly?
YES: Go to Step 2.
NO: Replace the Park/Neutral position switch.





STEP 2. Check connector B-16 at the Park/Neutral position switch for damage.
Q: Is the connector in good condition?
YES: Go to Step 3.
NO: Repair or replace it.





STEP 3. Check connector C-114 at PCM for damage.
Q: Is the connector in good condition?
YES: Go to Step 4.
NO: Repair or replace it.

STEP 4. Check the switch output voltage at PCM connector C-114 by backprobing. ("P" position)





1. Do not disconnect connector C-114.
2. Turn the ignition switch to the "ON" position.





3. Measure the voltage between terminal 101 and ground by backprobing.
^ When selector lever position is "P," voltage should be battery positive voltage.
^ When selector lever position is "R." voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 5.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 3 and PCM connector C-114 terminal 101.





STEP 5. Check the switch output voltage at PCM connector C-114 by backprobing. ("R" position) Measure the voltage between terminal 108 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be battery positive voltage.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 6.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 7 and PCM connector C-114 terminal 108.





STEP 6. Check the switch output voltage at PCM connector C-114 by backprobing. ("N" position) Measure the voltage between terminal 121 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be battery positive voltage.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 7.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 4 and PCM connector C-114 terminal 121.





STEP 7. Check the switch output voltage at PCM connector C-114 by backprobing. ("D" position) Measure the voltage between terminal 102 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be battery positive voltage.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 8.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 1 and PCM connector C-114 terminal 102.





STEP 8. Check the switch output voltage at PCM connector C-114 by backprobing. ("3" position) Measure the voltage between terminal 109 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be battery positive voltage.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 9.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 5 and PCM connector C-114 terminal 109.





STEP 9. Check me switch output voltage at PCM connector C-114 by backprobing. ("2" position) Measure the voltage between terminal 122 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be battery positive voltage.
^ When selector lever position is "L," voltage should be 0.5 volt or less.
Q: Is the voltage normal?
YES: Go to Step 10.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 2 and PCM connector C-114 terminal 122.





STEP 10. Check the switch output voltage at PCM connector C-114 by backprobing. ("L" position) Measure the voltage between terminal 110 and ground by backprobing.
^ When selector lever position is "P," voltage should be 0.5 volt or less.
^ When selector lever position is "R," voltage should be 0.5 volt or less.
^ When selector lever position is "N," voltage should be 0.5 volt or less.
^ When selector lever position is "D," voltage should be 0.5 volt or less.
^ When selector lever position is "3," voltage should be 0.5 volt or less.
^ When selector lever position is "2," voltage should be 0.5 volt or less.
^ When selector lever position is "L," voltage should be battery positive voltage.
Q: Is the voltage normal?
YES: Go to Step 11.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Repair harness damage between the Park/Neutral position switch connector B-16 terminal 6 and PCM connector C-114 terminal 110.





STEP 11. Using scan tool MB991502, check data list item 61: Park/Neutral Position Switch.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991502 to data reading mode for item 61: Park/Neutral Position Switch.
^ Move the selector lever to "P," "R," "N," "D," "3," "2," "L" positions and confirm the scan tool display.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: This malfunction is intermittent.
NO: Replace the PCM.

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