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Home >> Mitsubishi >> 2008 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1771

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 DTC P1770 (P0705). P1770

CIRCUIT OPERATION
Refer to DTC P1770 (P0705). 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)

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.

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.

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.

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.

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.

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) 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.
NO : Replace the PCM.
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