DTC 28
DTC 28 (P0705): Transmission Range Switch System (Short Circuit)
Transmission Range Switch System Circuit
Part 1 Of 3:
Part 2 Of 3:
Part 3 Of 3:
Transmission Range Switch System Circuit
CIRCUIT OPERATION
^ Battery positive voltage is applied to the transmission range 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 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.
DESCRIPTIONS OF MONITOR METHODS
If two types or more of signals are input from transmission range switch for more than 30 seconds, PCM judges that transmission range switch has a failure.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored)
^ Not applicable
Sensor (The sensor is determined to be normal)
^ Not applicable
LOGIC FLOW CHARTS (Monitor Sequence)
DTC SET CONDITIONS (Entry Conditions and Malfunction Thresholds)
Check Conditions, Judgment Criteria
^ Transmission range switch: multiple signal. (30 seconds)
OBD-II DRIVE CYCLE PATTERN
Start the engine, keep the vehicle stopped in "P," "R," "N," "D," "3," "2" and "L" ranges respectively for more than one minute, and turn OFF the ignition switch. Then restart the engine, and stop the vehicle in "P," "R," "N," "D," "3," "2" and "L" ranges respectively for more than one minute.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
^ Malfunction of the transmission range switch
^ Malfunction of the ignition switch
^ Damaged harness or 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. Check the transmission range switch.
Measure the resistance between the terminals for each selector position as indicated in the table.
NOTE: For vehicles with spoof mode, four positions (P, R, N, D) are used.
Q: Is the measured resistance less than 2 ohms for each selector position?
YES: Go to Step 2.
NO: Replace the transmission range switch.
STEP 2. Check transmission range switch connector B-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connector and terminals in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged components.
STEP 3. Check PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> for loose, 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 4. Measure the transmission range switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing. ("P" position)
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) Measure the voltage between terminal 101 and ground by backprobing.
^ When selector lever position is "P," voltage should measure battery positive voltage.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
^ When selector lever position is sport mode, voltage should measure 0.5 volt or less.
Q: Is the measured voltage within the specified range?
YES: Go to Step 8.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 5.
STEP 5. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 3 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 101.
Q: Is the harness wire in good condition?
YES
YES
NO: Repair or replace the harness wire.
STEP 6. Check intermediate connector C-27 and combination meter connector C-43 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 7.
NO: Repair or replace the damaged components.
STEP 7. Check harness for short circuit to ground between transmission range switch connector B-41 terminal 3 and combination meter connector C-43 terminal 11.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 8. Measure the transmission range switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing. ("R" position)
Measure the voltage between terminal 108 and ground by backprobing.
^ When selector lever position is "P," voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure battery positive voltage.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
^ When selector lever position is sport mode, voltage should measure 0.5 volt or less.
Q: Is the measured voltage within the specified range?
YES: Go to Step 12.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 9.
STEP 9. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 7 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 108.
Q: Is the harness wire in good condition?
YES
YES
NO: Repair or replace the harness wire.
STEP 10. Check intermediate connector C-27 and combination meter connector C-43 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 11.
NO: Repair or replace the damaged components.
STEP 11. Check harness for short circuit to ground between transmission range switch connector B-41 terminal 7 and combination meter connector C-43 terminal 10.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 12. Measure the transmission range switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing. ("N" position) Measure the voltage between terminal 121 and ground by backprobing.
^ When selector lever position is "P." voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure battery positive voltage.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
^ When selector lever position is sport mode, voltage should measure 0.5 volt or less.
Q: Is the measured voltage within the specified range?
YES: Go to Step 16.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 13.
STEP 13. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 4 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 121.
Q: Is the harness wire in good condition?
YES
YES
NO: Repair or replace the harness wire.
STEP 14. Check intermediate connector C-27 and combination meter connector C-43 for loose, 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 harness for short circuit to ground between transmission range switch connector B-41 terminal 4 and combination meter connector C-43 terminal 9.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 16. Measure the transmission range switch output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing. ("D" position)
Measure the voltage between terminal 102 and ground by backprobing.
^ When selector lever position is "P." voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure battery positive voltage.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
^ When selector lever position is sport mode, voltage should measure battery positive voltage.
Q: Is the measured voltage within the specified range?
YES: Go to Step 21.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 17.
STEP 17. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 1 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 102.
Q: Is the harness wire in good condition?
YES
YES
NO: Repair or replace the harness wire.
STEP 18. Check shift switch assembly connector C-65, intermediate connector C-27 and combination meter connector C-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 19.
NO: Repair or replace the damaged components.
STEP 19. Check harness for 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 20.
NO: Repair or replace the harness wire.
STEP 20. Check harness for short circuit to ground between shift switch assembly connector C-65 terminal 2 and combination meter connector C-41 terminal 50.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 21. Measure the transmission range switch output voltage at PCM connector C-61 by backprobing. ("3" position)
Measure the voltage between terminal 109 and ground by backprobing.
^ When selector lever position is "P," voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure battery positive voltage.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
Q: Is the measured voltage within the specified range?
YES: Go to Step 23.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 22.
STEP 22. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 5 and PCM connector C-61 terminal 109.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 23. Measure the transmission range switch output voltage at PCM connector C-61 by backprobing. ("2" position)
Measure the voltage between terminal 122 and ground by backprobing.
^ When selector lever position is "P," voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure battery positive voltage.
^ When selector lever position is "L," voltage should measure 0.5 volt or less.
Q: Is the measured voltage within the specified range?
YES: Go to Step 25.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 24.
STEP 24. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 2 and PCM connector C-61 terminal 122.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 25. Measure the transmission range switch output voltage at PCM connector C-61 by backprobing. ("L" position)
Measure the voltage between terminal 110 and ground by backprobing.
^ When selector lever position is "P," voltage should measure 0.5 volt or less.
^ When selector lever position is "R," voltage should measure 0.5 volt or less.
^ When selector lever position is "N," voltage should measure 0.5 volt or less.
^ When selector lever position is "D," voltage should measure 0.5 volt or less.
^ When selector lever position is "3," voltage should measure 0.5 volt or less.
^ When selector lever position is "2," voltage should measure 0.5 volt or less.
^ When selector lever position is "L," voltage should measure battery positive voltage.
Q: Is the measured voltage within the specified range?
YES: Go to Step 27.
NO: Turn the ignition switch to the "LOCK" (OFF) position. Then go to Step 26.
STEP 26. Check harness for open circuit or short circuit to ground between transmission range switch connector B-41 terminal 6 and PCM connector C-61 terminal 110.
Q: Is the harness wire in good condition?
YES: Go to Step 27.
NO: Repair or replace the harness wire.
STEP 27. Using scan tool MB991958, check data list item 61: Transmission Range Switch.
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 the scan tool MB991958 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Set the scan tool MB991958 to data reading mode for item 61: Transmission Range Switch.
^ Move the selector lever to "P," "R," "N," "D," "3," "2," "L" and sport mode positions and confirm that the selected selector lever positions match the positions shown on the scan tool MB991958. (Vehicles with sport mode is indicated as "D" on the scan tool)
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.