P1770

DTC P1770 (P0705): Transmission Range Switch System (Open Circuit)

CAUTION
If DTC P1770 (P0705) has been set, TCL related DTC C1397 is also set. After DTC P1770 (P0705) has been diagnosed, don't forget to erase DTC C1397.

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 67) 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 61 (77, 73) when the selector lever is in the "R" range ("N," "D" range). The PCM, judges that the selector lever is in the "R" range ("N," "D" 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 below)
^ Not applicable

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)

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" 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" 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 Tools:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check data list item 34: 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 34: Transmission Range Switch.
- Move the selector lever to "P," "R," "N," "D" and sport mode positions and confirm that the selected transmission range match the positions shown on scan tool MB991958, (The scan tool displays "D" range when the selector lever is shifted to the sport mode).
(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 sport mode position is not displayed correctly ("D" is not displayed.)] : Go to Step 29.

STEP 2. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table below.

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

Q : Does the resistance measure less than 2 ohms for each transmission range?
YES : Go to Step 3.
NO : Replace the transmission range switch.

STEP 3. Check intermediate connector A-15, C-24, transmission range switch connector B-113, joint connector (1) C-28 and junction block connector C-203 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-113 terminal 8 and junction block connector C-203 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 34: 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 34: Transmission Range Switch.
- Move the selector lever to "P," "R," "N," "D" and sport mode positions and confirm that the selected transmission range match the positions shown on scan tool MB991958, (The scan tool displays "D" range when the selector lever is shifted to the sport mode).
(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. When the PCM is replaced, register the encrypted code.

STEP 6. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table below.

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

Q : Does the resistance measure 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-113 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 B-20 by using check harness special tool MB991923.

(1) Disconnect all the connectors from the PCM.

(2) Connect special tool MB991923 (check harness) between the PCM and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Move the selector lever to the "P" position.

(5) Measure the voltage between terminal 67 and ground.
^ The voltage should measure battery positive voltage.
(6) 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 B-20 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 PCM, connector B-20 terminal 67 and transmission range switch connector B-113 terminal 3.

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 B-20 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 below.

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

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-113 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 B-20 by using check harness special tool MB991923.

(1) Disconnect all the connectors from the PCM.

(5) Measure the voltage between terminal 61 and ground.
^ The voltage should measure below battery positive voltage.
(6) 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 B-20 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 PCM, connector B-20 terminal 61 and transmission range switch connector B-113 terminal 7.

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 below.

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

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-113 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 B-20 by using check harness special tool MB991923.

(1) Disconnect all the connectors from the PCM.

(5) Measure the voltage between terminal 77 and ground.
^ The voltage should measure battery positive voltage.
(6) 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 B-20 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 PCM, connector B-20 terminal 77 and transmission range switch connector B-113 terminal 4.

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

STEP 22. Check the transmission range switch.

Measure the resistance between the terminals for each transmission range as indicated in the table below.

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

Q : Is the measured resistance less than 2 ohms for each transmission range?
YES : Go to Step 23.
NO : Replace the transmission range switch.

STEP 23. Check transmission range switch connector B-113 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 24.
NO : Repair or replace the damaged components.

STEP 24. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923.

(1) Disconnect all the connectors from the PCM.

(5) Measure the voltage between terminal 73 and ground.
^ The voltage should equal battery voltage (approximately 12 volts).
(6) Turn the ignition switch to the "LOCK" (OFF) position.

Q : Does the voltage measure battery positive voltage?
YES : Go to Step 11.
NO : Go to Step 25.

STEP 25. Check PCM connector B-20 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 26.
NO : Repair or replace the damaged components.

STEP 26. Check harness for open circuit or short circuit to ground between PCM, connector B-20 terminal 73 and transmission range switch connector B-113 terminal 1.

Q : Is the harness wire in good condition?
YES : Go to Step 27.
NO : Repair or replace the harness wire.

STEP 27. Check intermediate connector A-15 and shift switch assembly connector C-17 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 28.
NO : Repair or replace the damaged components.

STEP 28. Check harness for short circuit to ground between transmission range switch connector B-113 terminal 1 and shift switch assembly connector C-17 terminal 1.

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

STEP 29. Check the shift switch assembly. Refer to Transaxle Control.

Q : Is the switch operating properly?
YES : Go to Step 30.
NO : Replace the shift switch assembly.

STEP 30. Check PCM, connector B-19 and shift switch assembly connector C-17 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 31.
NO : Repair or replace the damaged components.

STEP 31. Check harness for short circuit to ground between PCM, connector B-19 terminal 39 and shift switch assembly connector C-17 terminal 6.

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