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Home >> Mitsubishi >> 2004 >> Eclipse V6-3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnosis Charts >> Inspection Procedure 18

Inspection Procedure 18

INSPECTION PROCEDURE 18: Shift Switch Assembly System

Part 1 Of 3:




Part 2 Of 3:




Part 3 Of 3:






CIRCUIT OPERATION
If the select switch of the shift switch assembly is set to the sport mode, battery positive voltage will be applied to the PCM (terminal 109). If the shift switch of the shift switch assembly is set to "UP" or "DOWN" position, battery positive voltage will be applied to the PCM (terminal 122, 110).

COMMENT
The cause is probably a malfunction of the transmission range switch circuit, shift switch assembly circuit or a defective PCM.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
^ Malfunction of the transmission range switch
^ Malfunction of the shift switch assembly select switch
^ Malfunction of the shift switch assembly shift switch (Up)
^ Malfunction of the shift switch assembly shift switch (Down)
^ Damaged harness, connector
^ Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
^ MB991958: Scan Tool (MUT-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: MUT-III USB Cable
^ MB991911: MUT-III Main Harness B

STEP 1. Using scan tool MB991958, read the A/T diagnostic trouble code.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Check for A/T diagnostic trouble code.
4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 27 or 28 set?
YES : Refer to DTC 27: Transmission Range Switch System (Open Circuit).
YES : Refer to DTC 28: Transmission Range Switch System (Short Circuit).
NO: Go to Step 2.

STEP 2. Using scan tool MB991958, check data list item 67: Select Switch, item 68: Shift Switch (Up), item 69: Shift Switch (Down).





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Set scan tool MB991958 to data reading mode for following items.





a. item 67: Select Switch
b. item 68: Shift Switch (Up)
c. item 69: Shift Switch (Down)

NOTE: The switches above are displayed, depending on the selector lever condition as shown in the table.

4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO : Go to Step 3.
NO : Go to Step 5.
NO : Go to Step 9.
NO : Go to Step 17.
NO : Go to Step 22.

STEP 3. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and shift switch assembly connector C-65 for looser, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

STEP 4. Using scan tool MB991958, check data list item 67: Select Switch, item 68: Shift Switch (Up), item 69: Shift Switch (Down).

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Check the following items in the data list.





a. item 67: Select Switch
b. item 68: Shift Switch (Up)
c. item 69: Shift Switch (Down

NOTE: The switches above are displayed, depending on the selector lever condition as shown in the table.

4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the PCM.

STEP 5. Check the shift switch assembly.
Q: Is the switch operating properly?
YES: Go to Step6.
NO: Replace the shift switch assembly.

STEP 6. Measure the power supply voltage at shift switch assembly connector C-65.





1) Disconnect connector C-65 and measure at the harness side.
2) Turn the ignition switch to the "ON" position.





3) Measure the voltage between terminal 6 and ground.
^ The voltage should measure battery positive voltage.
4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 4.
NO: Go to Step 7.

STEP 7. Check shift switch assembly connector C-65 and intermediate connector C-28 for looser, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 8.
NO: Repair or replace the damaged components.

STEP 8. Check the harness for open circuit or short circuit to ground between shift switch assembly connector C-65 terminal 6 and intermediate connector C-28 terminal 2.











Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.

STEP 9. Measure the power supply voltage at shift switch assembly connector C-65.





1) Disconnect connector C-65 and measure at the harness side.
2) Turn the ignition switch to the "ON" position.
3) Move the selector lever to the "D" position.





4) Measure the voltage between terminal 1 and ground.
^ The voltage should measure battery positive voltage.
5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 12.
NO: Go to Step 10.

STEP 10. Check shift switch assembly connector C-65 for looser, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 11.
NO: Repair or replace the damaged components.

STEP 11. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 1 and shift switch assembly connector C-65 terminal 1.








Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.

STEP 12. Check the shift switch assembly.
Q: Is the switch operating properly?
YES: Go to Step 13.
NO: Replace the shift switch assembly.

STEP 13. Measure the switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing.





1) Do not disconnect connector C-61 <2.4L Engine> or C-63 <3.0L Engine>.
2) Turn the ignition switch to the "ON" position.
3) Move the selector lever to the sport mode.





4) Measure the voltage between terminal 109 and ground by backprobing.
^ The voltage should measure battery positive voltage.
5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 16.
NO: Go to Step 14.

STEP 14. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and shift switch assembly connector C-65 for looser, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 15.
NO: Repair or replace the damaged components.

STEP 15. Check the harness for open circuit or short circuit to ground between PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 109 and shift switch assembly connector C-65 terminal 5.








Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.

STEP 16. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> for looser, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

STEP 17. Check the shift switch assembly.
Q: Is the switch operating properly?
YES: Go to Step 18.
NO: Replace the shift switch assembly.

STEP 18. Measure the switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine>.





1) Disconnect connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and measure at the harness side.
2) Turn the ignition switch to the "ON" position.





3) Measure the voltage between terminal 122 and ground.
^ The voltage should measure battery positive voltage when the selector lever is upshift and hold.
4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 21.
NO: Go to Step 19.

STEP 19. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and shift switch assembly connector C-65 for looser, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 20.
NO: Repair or replace the damaged components.

STEP 20. Check the harness for open circuit or short circuit to ground between PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 122 and shift switch assembly connector C-65 terminal 3.








Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.

STEP 21. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> for looser, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

STEP 22. Check the shift switch assembly.
Q: Is the switch operating properly?
YES: Go to Step 23.
NO: Replace the shift switch assembly.

STEP 23. Measure the switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine>.





1) Disconnect connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and measure at the harness side.
2) Turn the ignition switch to the "ON" position.





3) Measure the voltage between terminal 110 and ground.
^ The voltage should measure battery positive voltage when the selector lever is downshift and hold.
4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 26.
NO: Go to Step 24.

STEP 24. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> and shift switch assembly connector C-65 for looser, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 25.
NO: Repair or replace the damaged components.

STEP 25. Check the harness for open circuit or short circuit to ground between PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 110 and shift switch assembly connector C-65 terminal 4.








Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair or replace the harness wire.

STEP 26. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> for looser, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

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