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Home >> Mitsubishi >> 2000 >> Eclipse GT 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
- 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 "P" 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 [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 battery positive 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 30 seconds, it is judged that there is an open circuit in the Park/Neutral position switch circuit 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 30 seconds, it is judged that there is a short circuit in the Park/Neutral position switch circuit 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 harness, connector
- Malfunction of the PCM

DIAGNOSIS





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

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

STEP 1. Using Scan Tool MB991502, Check Data List Item 61: Park/Neutral Position Switch.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. See scan tool MB991502 to the data reading mode for item 61, Park/Neutral position switch.
4. Display should be the same as the actual selector lever position.
If all positions of the Park/Neutral position switch are operating properly, this malfunction can be intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.
If any position (s) of the Park/Neutral position switch is not operating properly, go to Step 2.

STEP 2. Check The Park/Neutral Position Switch.








NOTE: For vehicles with sport mode, four positions (P, R, N, D) are used.

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 harness connector B-41 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 8 and ground. * Voltage should be battery positive voltage.
If not within the battery positive voltage, repair the connectors or the harness wires between the Park/Neutral position switch and the ignition switch.
If within the battery positive voltage, go to Step 4.

STEP 4. Check Harness Connector B-41 At The Park/Neutral Position Switch For Damage.





If harness connector B-41 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector B-41 is in good condition, go to Step 5.

STEP 5. Check Harness Connector C-61 <2.4L Engine> Or C-63 <3.0L Engine> At The PCM For Damage.





If harness connector C-61 <2.4L Engine> or C-63 <3.0L Engine> is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector C-61 <2.4L Engine> or C-63 <3.0L Engine> is in good condition, go to Step 6.

STEP 6. Measure The PCM Terminal Voltage.
Measure the voltage at terminals 101, 102, 108, 109, 110, 121 and 122 of PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine>. Refer to PCM Terminal Voltage Reference Chart for Transaxle Operation.
If the voltage meets the specifications, replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Refer to Ignition Switch and Immobilizer System - Ignition Switch and Immobilizer System.
If the voltage does not meet the specifications, check to see it any harness wires between PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and Park/Neutral position switch connector B-41 are damaged, and repair them. Refer to Harness Connector Inspection. Recheck for DTCs.

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