Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi Truck >> 2000 >> Montero Sport LS 2WD V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Cruise Control >> DTC 14

DTC 14

Auto-cruise Vacuum Pump Power Supply System:




CIRCUIT OPERATION
This circuit supplies the power to the vacuum pump. The battery positive voltage is supplied to the auto-cruise control vacuum pump by turning ON the transistor at terminal number 16 of the auto-cruise control-ECU.

The conditions for turning ON the transistor at terminal number 16 of the auto-cruise control-ECU are as follows.
- Ignition switch "ON"
- Auto-cruise control main switch "ON"
- Stoplight switch ON

DTC SET CONDITIONS
None of the drive signals from release valve, control valve and motor of the auto-cruise vacuum pump are input to the auto-cruise control-ECU.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Malfunction of the stoplight switch
- Malfunction of the auto-cruise vacuum pump
- Damaged connector and harness
- Malfunction of the auto-cruise control-ECU

DIAGNOSIS

STEP 1. Check the auto-cruise vacuum pump power supply voltage.
1. Disconnect auto-cruise vacuum pump connector A-02 and measure at the harness side.




2. Measure the voltage between terminal 1 and ground.

- Voltage should be system voltage.
If the voltage is outside the specification, go to Step 2. If the voltage meets specification, go to Step 3.

STEP 2. Check the stoplight switch.
1. Disconnect C-66 connector at the stoplight switch.
2. Connect an ohmmeter to the stoplight switch, and check whether there is continuity when the plunger of the stoplight switch is pushed in and when it is released.
3. The stoplight switch is in good condition if there is no continuity when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if there is continuity when it is released.




4. The check for continuity should be made at connector terminals 1 and 4 of the stoplight switch.

If there is no continuity, replace the stoplight switch. Check that a diagnostic trouble code is not output.

If the diagnostic trouble code is output even after the stoplight switch is replaced, go to Step 5.

STEP 3. Check the auto-cruise vacuum pump.




1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the auto-cruise vacuum pump connector.




3. Check that the reading ON the vacuum gauge matches the values in the table below when the battery is connected to each connector terminal.
If the above values are satisfied, go to Step 4.

If the above values are not satisfied, replace the auto-cruise vacuum pump. Then check that a diagnostic trouble code is not output.




STEP 4. Check the circuit at the auto-cruise control ECU connector.
1. Connect the auto-cruise control connector and measure the voltage between the auto-cruise control-ECU connector terminal 7 and ground.
- Voltage should be system voltage.
2. Measure the voltage between the auto-cruise control-ECU connector terminal 8 and ground.
- Voltage should be system voltage.
3. Measure the voltage between the auto-cruise control-ECU connector terminal 16 and ground.
- Voltage should be system voltage.

If each voltage is system voltage, to Step 7.

If each voltage is not system voltage, go to Step 6.










STEP 5. Check the harness connectors A-02 at the auto-cruise vacuum pump, C-35 at the auto-cruise control-ECU, C-66 at the stoplight switch for damage.
If the harness connectors are damaged, repair or replace.

Refer to Harness Connect or Inspection.

Check that a diagnostic trouble code is not output.

If the harness connectors are in good condition, go to Step 8.







STEP 6. Check harness connectors A-02 at the auto-cruise vacuum pump and C-35 at the auto-cruise control-ECU for damage.
If harness connector A-02 or C-35 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Then check that a diagnostic trouble code is not output.

If harness connector A-02 or C-35 is in good condition, go to Step 8.




STEP 7. Check harness connector C-35 at the auto-cruise control-ECU for damage.
If harness connector C-35 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Then check that a diagnostic trouble code is not output.

If harness connector C-35 is in good condition, replace the auto-cruise control-ECU. Check that a diagnostic trouble code is not output.







STEP 8. Check the harness wire between the auto-cruise control-ECU connector C-35 and the stoplight switch connector C-66.
If any harness wire between the auto-cruise control-ECU connector C-35 and the stoplight switch connector C-66 is damaged, repair or replace it. Check that a diagnostic trouble code is not output.

If the harness wire are in good condition, replace the auto-cruise control-ECU. Check that a diagnostic trouble code is not output.






NOTE: After checking intermediate connector C-41, inspect the wire. If intermediate connector C-41 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Check that a diagnostic trouble code is not output.









pro multis · About Operation CHARM