P1771
DTC P1771 (P0705): Transmission Range Switch System (Short Circuit)
CAUTION:
If DTC P1771 (P0705) has been set, TCL related DTC C1397 is also set. After DTC P1771 (P0705) has been diagnosed, don't forget to erase DTC C1397.
TRANSMISSION RANGE SWITCH SYSTEM CIRCUIT
Refer to P1770.
CIRCUIT OPERATION
Refer to P1770.
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 below)
- Not applicable
Sensor (The sensor below is determined to be normal)
- Not applicable
LOGIC FLOW CHARTS (Monitor Sequence)
DTC SET CONDITIONS
Check Conditions, Judgement Criteria
- Transmission range switch: multiple signal. (30 seconds)
OBD-II DRIVE CYCLE PATTERN
Start the engine, keep the vehicle stopped in "P," "R," "N," and "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," and "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 circuit
- Damaged harness or connector
- Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
- 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. 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 selector position?
YES Go to Step 2.
NO Replace the transmission range switch. Transaxle Disassembly and Assembly Transaxle [4A/T] or Transaxle Disassembly and Assembly Transaxle [5A/T].
STEP 2. 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 3.
NO Repair or replace the damaged components. Harness Connector Inspection.
STEP 3. 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 4.
NO Repair or replace the damaged components. Harness Connector Inspection.
STEP 4. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("P" position)
(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)Measure the voltage between terminal 67 and ground.
- When transmission range is "P," voltage should equal battery positive voltage.
- When transmission range is "R," voltage should measure 0.5 volt or less.
- When transmission range is "N," voltage should measure 0.5 volt or less.
- When transmission range is "D," voltage should measure 0.5 volt or less.
- When transmission range is sport mode, voltage should measure 0.5 volt or less.
Q. Is the measured voltage within the specified range?
YES Go to Step 6.
NO Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 5.
STEP 5. Check harness for damage 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 14.
NO Repair or replace the harness wire.
STEP 6. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("R" position)
Measure the voltage between terminal 61 and ground.
- When transmission range is "P," voltage should measure 0.5 volt or less.
- When transmission range is "R," voltage should equal battery positive voltage.
- When transmission range is "N," voltage should measure 0.5 volt or less.
- When transmission range is "D," voltage should measure 0.5 volt or less.
- When transmission range 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. Go to Step 7.
STEP 7. Check the harness for damage 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 14.
NO Repair or replace the harness wire.
STEP 8. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("N" position)
Measure the voltage between terminal 77 and ground.
- When transmission range is "P," voltage should measure 0.5 volt or less.
- When transmission range is "R," voltage should measure 0.5 volt or less.
- When transmission range is "N," voltage should equal battery positive voltage.
- When transmission range is "D," voltage should measure 0.5 volt or less.
- When transmission range is sport mode, voltage should measure 0.5 volt or less.
Q. Is the measured voltage within the specified range?
YES Go to Step 10.
NO Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 9.
STEP 9. Check the harness for damage 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 14.
NO Repair or replace the harness wire.
STEP 10. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("D" position)
Measure the voltage between terminal 73 and ground.
- When transmission range is "P," voltage should measure 0.5 volt or less.
- When transmission range is "R," voltage should measure 0.5 volt or less.
- When transmission range is "N," voltage should measure 0.5 volt or less.
- When transmission range is "D," voltage should equal battery positive voltage.
- When transmission range is sport mode, voltage should equal battery positive voltage.
Q. Is the measured voltage within the specified range?
YES Go to Step 14.
NO Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 11.
STEP 11. Check the harness for damage 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 12.
NO Repair or replace the harness wire.
STEP 12. Check intermediate connector A-15, 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 connectors and terminals in good condition?
YES Go to Step 13.
NO Repair or replace the damaged components. Harness Connector Inspection.
STEP 13. Check the harness for damage between PCM connector B-19 terminal 39 and transmission range switch connector B-113 terminal 1.
Q. Is the harness wire in good condition?
YES Go to Step 14.
NO Repair or replace the harness wire.
STEP 14. Using scan tool MB991958, check data list item 34: Transmission Range Switch.
(1)
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.
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.
- Item 34: Transmission Range Switch.
- Move the selector lever to "P," "R," "N," "D" and sport mode positions and confirm that the selected transmission ranges match the positions (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. How to Cope With Intermittent Malfunctions.
NO Replace the PCM.