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Home >> Mitsubishi Truck >> 2002 >> Montero Sport ES 4WD V6-3.0L SOHC >> Repair and Diagnosis >> Transmission and Drivetrain >> Transmission Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnosis Charts >> Inspection Procedure 17

Inspection Procedure 17

INSPECTION PROCEDURE 17: Transfer Low Detection Switch System






CIRCUIT OPERATION
^ A battery positive voltage is applied to the transfer low detection switch output terminal (terminal 1) from the PCM (terminal 112) via the resistance in the unit.
^ The transfer low detection switch is grounded through the transfer case to the vehicle body.

COMMENT
^ If the transmission will not shift to 3rd gear, or if it shifts to 3rd gear when the transfer lever is in the "4L" position, the cause is probably a malfunction of the transfer low detection switch.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set:)
^ Malfunction of the transfer low detection switch
^ Damaged harness, connector
^ Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
^ MB991502: Scan Tool (MUT-II)





STEP 1. Using scan tool MB991502, check data list item 75: transfer low Detection Switch.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to data reading mode for item 75: transfer low Detection Switch.
^ When the transfer shift lever position is 4L, the scan tool display should be "ON."
^ When the transfer shift lever position is other than 4L, the scan tool display should be "OFF."
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: This malfunction is intermittent.
NO: Go to Step 2.





STEP 2. Check connector B-17 at transfer low detection switch for damage.
Q: Is the connector in good condition?
YES: Go to Step 3.
NO: Repair or replace it.

STEP 3. Check the switch output voltage at transfer low detection switch connector B-17.





1. Disconnect connector B-17 and measure at the harness side.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 1 and ground.
^ Voltage should be battery positive voltage.
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES: Go to Step 9.
NO: Go to Step 4.

STEP 4. Check the switch output voltage at PCM connector C-92 by backprobing.





1. Do not disconnect connector C-92.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 112 and ground by backprobing.
^ Voltage should be battery positive voltage.
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES: Go to Step 5.
NO: Go to Step 6.








STEP 5. Check connectors C-96 at intermediate connector and C-92 at PCM for damage.
Q: Are the connectors in good condition?
YES: Repair harness open circuit between transfer low detection switch connector B-17 terminal 1 and PCM connector C-92 terminal 112.
NO: Repair or replace the defective connector(s).








STEP 6. Check connectors C-96 at intermediate connector and C-92 at PCM for damage.
Q: Are the connectors in good condition?
YES: Go to Step 7.
NO: Repair or replace the defective connector(s).








STEP 7. Check harness for damage between transfer low detection switch connector B-17 terminal 1 and PCM connector C-92 terminal 112.
Q: Is the harness wire in good condition?
YES: Go to Step 8.
NO: Repair it.





STEP 8. Using scan tool MB991502, check data list item 75: Transfer low Detection Switch.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to data reading mode for item 75: transfer low Detection Switch.
^ When the transfer shift lever position is 4L, the scan tool display should be "ON."
^ When the transfer shift lever position is other than 4L, the scan tool display should be "OFF."
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: This malfunction is intermittent.
NO: Replace the PCM.

STEP 9. Check the continuity at transfer low detection switch connector B-17.





1. Disconnect connector B-17 and measure at the switch side.
2. Turn the ignition switch to "ON" position.
3. Selector lever position should be "N" range.





4. Check for the continuity between terminal 1 and ground.
^ When the transfer shift lever position is 4L there should be less than 2 ohms.
^ When the transfer shift lever position is other than 4L there should be open circuit.
5. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the continuity normal?
YES: Go to Step 10.
NO: Replace the transfer low detection switch.





STEP 10. Check connector C-92 at PCM for damage.
Q: Is the connector in good condition?
YES: Go to Step 11.
NO: Repair or replace it.





STEP 11. Using scan tool MB991502, check data list item 75: transfer low Detection Switch.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to data reading mode for item 75: transfer low Detection Switch.
^ When the transfer shift lever position is 4L, the scan tool display should be "ON."
^ When the transfer shift lever position is other than 4L, the scan tool display should be "OFF."
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: This malfunction is intermittent.
NO: Replace the PCM.

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