Part 1 of 2

DTC 27 (P0705): Transmission Range Switch System (Open Circuit)

Part 1 Of 2:

Part 2 Of 2:

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 transmission range is in the "P" range. The PCM judges that the transmission range 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 no signal is 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
Check Conditions, Judgement Criteria
^ Transmission range switch: no signal detected. (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 "LOCK" (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. 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 scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991958 to the data reading mode.
^ Item 61: Transmission Range Switch.
^ Move the selector lever to "P," "R," "N," "D," "3," "2" and "L" positions and confirm that the selected transmission range match the positions shown on scan tool MB991958.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the scan tool indication correspond to the actual transmission range?
YES: It can be assumed that this malfunction is intermittent.
NO: (no correct transmission range is displayed): Go to Step 2.
NO: (Only "P" position is not displayed correctly): Go to Step 6.
NO: (Only "R" position is not displayed correctly): Go to Step 12.
NO: (Only "N" position is not displayed correctly): Go to Step 17.
NO: (Only "D" position is not displayed correctly): Go to Step 22.
NO: (Only "3" position is not displayed correctly): Go to Step 27.
NO: (Only "2" position is not displayed correctly): Go to Step 32.
NO: (Only "L" position is not displayed correctly): Go to Step 37.

STEP 2. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table.
Q: Is the measured resistance less than 2 ohms for each transmission range?
YES: Go to Step 3.
NO: Replace the transmission range switch.

STEP 3. Check transmission range switch connector B-16, intermediate connector C-123 and junction block connector C-210 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 4.
NO: Repair or replace the damaged components.

STEP 4. Check harness for open or short circuit to ground between transmission range switch connector B-16 terminal 8 and junction block connector C-210 terminal 12.

Q: Is the harness wire in good condition?
YES: Go to Step 5.
NO: Repair or replace the harness wire.

STEP 5. Using scan tool MB991958, check data list item 61 :Transmission Range Switch.

Measure the resistance between the terminals for each transmission range as indicated in the table.
Q: Is the measured resistance less than 2 ohms for each transmission range?
YES: Go to Step 7.
NO: Replace the transmission range switch.

STEP 7. Check transmission range switch connector B-16 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 8.
NO: Repair or replace the damaged components.

STEP 8. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing.

1. Do not disconnect connector C-114.
2. Turn the ignition switch to the "ON" position.
3. Move the selector lever to the "P" position.

4. Measure the voltage between terminal 101 and ground.
^ The voltage should be measured 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 11.
NO: Go to Step 9.

STEP 9. Check PCM connector C-114 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 10.
NO: Repair or replace the damaged components.

STEP 10. Check harness for open circuit or short circuit to ground between transmission range switch connector B-16 terminal 3 and PCM connector C-114 terminal 101.

Q: Is the harness wire in good condition?
YES: Go to Step 5.
NO: Repair or replace the harness wire.

STEP 11. Check PCM connector C-114 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 5.
NO: Repair or replace the damaged components.

STEP 12. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table.
Q: Is the measured resistance less than 2 ohms for each transmission range?
YES: Go to Step 13.
NO: Replace the transmission range switch.

STEP 13. Check transmission range switch connector B-16 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 14.
NO: Repair or replace the damaged components.

STEP 14. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing.

1. Do not disconnect connector C-114.
2. Turn the ignition switch to the "ON" position.
3. Move the selector lever to the "R" position.

4. Measure the voltage between terminal 108 and ground.
^ The voltage should be measured 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 11.
NO: Go to Step 15.

STEP 15. Check PCM connector C-114 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 16.
NO: Repair or replace the damaged components.

STEP 16. Check harness for open circuit or short circuit to ground between transmission range switch connector B-16 terminal 7 and PCM connector C-114 terminal 108.

Q: Is the harness wire in good condition?
YES: Go to Step 5.
NO: Repair or replace the harness wire.

STEP 17. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table.
Q: Is the measured resistance less than 2 ohms for each transmission range?
YES: Go to Step 18.
NO: Replace the transmission range switch.

STEP 18. Check transmission range switch connector B-16 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 19.
NO: Repair or replace the damaged components.

STEP 19. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing.

1. Do not disconnect connector C-114.
2. Turn the ignition switch to the "ON" position.
3. Move the selector lever to the "N" position.

4. Measure the voltage between terminal 121 and ground.
^ The voltage should be measured 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 11.
NO: Go to Step 20.

STEP 20. Check PCM connector C-114 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 21.
NO: Repair or replace the damaged components.

STEP 21. Check harness for open circuit or short circuit to ground between transmission range switch connector B-16 terminal 4 and PCM connector C-114 terminal 121.

Q: Is the harness wire in good condition?
YES: Go to Step 5.
NO: Repair or replace the harness wire.