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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 transmission range as indicated in the table below.

TRANSMISSION RANGE TERMINAL CONNECTION OF TESTER SPECIFIED CONDITION
P 3 - 8, 9 - 10 Less than 2 ohms.
R 7 - 8
N 4 - 8, 9 - 10
D 1 - 8
3 5 - 8
2 2 - 8
L 6 - 8


Q: Is the measured resistance less than 2 ohms for each selector position?

YES: Go to Step 2 .
NO: Replace the transmission range switch. Refer to GROUP 23C, Transaxle .





STEP 2. 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 3 .
NO: Repair or replace the damaged components. Refer to GROUP 00E, Harness Connector Inspection .




STEP 3. 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 4 .
NO: Repair or replace the damaged components. Refer to GROUP 00E, Harness Connector Inspection .




STEP 4. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("P" position)

(1) Do not disconnect connector C-114.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 101 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 "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," 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 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 18 .
NO: Repair or replace the harness wire.




STEP 6. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("R" position)

Measure the voltage between terminal 108 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 "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," 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 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 18 .
NO: Repair or replace the harness wire.




STEP 8. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("N" position)

Measure the voltage between terminal 121 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 "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," 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 and transmission range switch connector B-16 terminal 4 PCM connector C-114 terminal 121.
Q: Is the harness wire in good condition?

YES: Go to Step 18 .
NO: Repair or replace the harness wire.




STEP 10. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("D" position)

Measure the voltage between terminal 102 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 "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," 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. Go to Step 11 .




STEP 11. Check the harness for damage between transmission range switch connector B-16 terminal 1 and PCM connector C-114 terminal 102.
Q: Is the harness wire in good condition?

YES: Go to Step 18 .
NO: Repair or replace the harness wire.




STEP 12. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("3" position)

Measure the voltage between terminal 109 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 measure 0.5 volt or less.
When transmission range is "3," voltage should equal battery positive voltage.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," voltage should measure 0.5 volt or less.
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 13 .




STEP 13. Check the harness for damage between transmission range switch connector B-16 terminal 5 and PCM connector C-114 terminal 109.
Q: Is the harness wire in good condition?

YES: Go to Step 18 .
NO: Repair or replace the harness wire.




STEP 14. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("2" position)

Measure the voltage between terminal 122 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 measure 0.5 volt or less.
When transmission range is "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should equal battery positive voltage.
When transmission range is "L," 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. Go to Step 15 .




STEP 15. Check the harness for damage between transmission range switch connector B-16 terminal 2 and PCM connector C-114 terminal 122.
Q: Is the harness wire in good condition?

YES: Go to Step 18 .
NO: Repair or replace the harness wire.




STEP 16. Measure the transmission range switch output voltage at PCM connector C-114 by backprobing. ("L" position)

Measure the voltage between terminal 110 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 measure 0.5 volt or less.
When transmission range is "3," voltage should measure 0.5 volt or less.
When transmission range is "2," voltage should measure 0.5 volt or less.
When transmission range is "L," voltage should equal battery positive voltage.
Q: Is the measured voltage within the specified range?

YES: Go to Step 18 .
NO: Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 17 .




STEP 17. Check the harness for damage between transmission range switch connector B-16 terminal 6 and PCM connector C-114 terminal 110.
Q: Is the harness wire in good condition?

YES: Go to Step 18 .
NO: Repair or replace the harness wire.




STEP 18. Using scan tool MB991958, check data list item 61: Transmission Range Switch.


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 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: Is the switch operating properly?

YES: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .
NO: Replace the PCM.