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Cruise Control Systems - Except Evolution: Diagnosis Mitsubishi Lancer IX

Cruise Control Systems 6 illustrations ~1586 words

AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

Use these steps to plan your diagnostic strategy. If you follow them carefully, you will check most of the possible causes of an auto-cruise control system problem.

  1. Gather information from the customer.
  2. Verify that the condition described by the customer exists.
  3. Check the vehicle for any auto-cruise control system DTC's.
  4. If you can verify the condition and there are no auto-cruise control system DTC's, and the malfunction is intermittent, see «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(ref-169874-S01630797622004121700000) under TROUBLESHOOTING.
  5. If you can verify the condition but there are no auto-cruise control system DTC's, or the system cannot communicate with the scan tool, check that the auto-cruise control system is operating properly. If the auto-cruise control system is operating properly, see «DATA LIST REFERENCE TABLE»(ref-169874-S30157074012004121700000) under SYMPTOM PROCEDURES. If the auto-cruise control system is operating properly, see «DIAGNOSTIC TROUBLE CODE CHART»(ref-169874-S13727435022004121700000) table under DIAGNOSTIC TROUBLE CODE PROCEDURES.
  6. If there is an auto-cruise control system DTC, record the number of the code, then erase the code from vehicle memory using the scan tool.
  7. Re-create the auto-cruise control system DTC set conditions to see if the same auto-cruise control system DTC will set again. If the same auto-cruise control system DTC sets again, perform diagnostic procedures for the set code. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-169874-S13727435022004121700000) .

Using Scan Tool MB991502

CAUTIONTo prevent damage to scan tool MB991502, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991502.
  1. Connect scan tool MB991502 to the data link connector. (Scheme 3)
  2. Turn the ignition switch to the ON position.
  3. Use the scan tool MB991502 to check for auto-cruise control system diagnostic trouble codes.
  4. Turn the ignition switch to the LOCK (OFF) position.
  5. Disconnect scan tool MB991502.

Scheme 3

Scheme 3
Scheme 3

Erasing Diagnostic Trouble Codes

Note. The diagnostic trouble code will not be erased even if the negative battery terminal is disconnected.

CAUTIONTo prevent damage to scan tool MB991502, always turn the ignition switch to the 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 the ON position.
  3. Use scan tool MB991502 to check for auto-cruise control system diagnostic trouble codes.
  4. Turn the ignition switch to the LOCK (OFF) position.
  5. Disconnect scan tool MB991502.

Without Using Scan Tool MB991502

  1. Turn the ignition switch to the ON position while holding the auto-cruise control switch in the SET (down) position. Then, within one second, move the cruise control switch up to the RES position.
  2. Check to make sure the CRUISE light on the instrument panel is flashing.
  3. Put the auto-cruise control switch in the SET (down) position. Depress the brake pedal and hold for 5 seconds or more. Release the brake pedal, auto-cruise control switch, then turn the ignition switch to the LOCK (OFF) position. (Scheme 4) The DTC(s) are now erased.

Scheme 4

Scheme 4
Scheme 4

INSPECTION USING SCAN TOOL MB991502

CAUTIONTo prevent damage to scan tool MB991502, always turn the ignition switch to the 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 the ON position.
  3. Carry out inspection by means of the data list. If there is an abnormality, check and repair the chassis harness and components. See «SYMPTOM LIST»(ref-169874-S30157074012004121700000) under SYMPTOM PROCEDURES.
  4. Re-check using scan tool MB991502 and check to be sure that the abnormal input and output have returned to normal because of the repairs.
  5. Erase the Diagnostic Trouble Codes (DTC's).
  6. Turn the ignition switch to the LOCK (OFF) position.
  7. Disconnect scan tool MB991502 from the data link connector.
  8. Start the engine again and do a test drive to confirm that the problem is eliminated.

Use Simulation Test

In the cases of vibration or poor connections, use the simulation tests to attempt to duplicate the customers complaint. Determine the most likely circuit(s) and perform the simulation tests on the connectors and parts of that circuit(s). See SIMULATION TESTS . Be sure to use the inspection procedures provided for diagnostic trouble codes and trouble symptoms.

For temperature and/or moisture condition related intermittent malfunctions, try to change the conditions of the suspected circuit components, then use the simulation tests. See SIMULATION TESTS .

DIAGNOSTIC TROUBLE CODE PROCEDURES

Inspection ItemDTC
Auto-cruise vacuum pump drive system.11
Vehicle speed signal system. (A/T)12
Vehicle speed signal system. (M/T)12
Auto-cruise vacuum pump power supply system.14
Auto-cruise control switch system.15
Auto-cruise control-ECU system.16
Throttle position sensor and, idle position signal system (A/T)17
Throttle position sensor and, idle position signal system (M/T)17

DIAGNOSTIC TROUBLE CODE CHART

Scheme 5

Scheme 5: Circuit Diagram
Scheme 5: Circuit Diagram

DTC Set Conditions

Any drive signal for the release valve, control valve, or motor is not input to the auto-cruise control-ECU.

Troubleshooting Hints

The most likely causes for this code to be set are

  1. Malfunction of the auto-cruise vacuum pump.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.

The vehicle speed signals from the vehicle speed sensor are not input to the auto-cruise control-ECU when the vehicle speed is 40 km/h (25 mph) or more.

The most likely causes for this code to be set are

  1. Malfunction of the vehicle speed sensor.
  2. Damaged harness connector.
  3. Malfunction of the auto-cruise control-ECU.

The vehicle speed signals from the PCM are not input to the auto-cruise control-ECU when the vehicle speed is 40 km/h (25 mph) or more.

The most likely causes for this code to be set are

  1. Malfunction of the output shaft speed sensor.
  2. Malfunction of the PCM.
  3. Damaged harness or connector.
  4. Malfunction of the auto-cruise control-ECU.

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.

The most likely causes for this code to be set are

  1. Malfunction of the stoplight switch.
  2. Malfunction of the auto-cruise vacuum pump.
  3. Damaged harness or connector.
  4. Malfunction of the auto-cruise control-ECU.

Scheme 6

Scheme 6: Step 1: Check The Output Circuit Voltage At Stoplight Switch Connector C-102 By Backprobing
Scheme 6: Step 1: Check The Output Circuit Voltage At Stoplight Switch Connector C-102 By Backprobing
  1. DO NOT disconnect stoplight switch connector C-102.
  2. Turn the ignition switch to the ON position.
  3. Measure the voltage between terminal No. 3 and ground by backprobing. The measured voltage should measure battery positive voltage. (When the brake pedal is depressed). The measured voltage should be 0 volts. (When the brake pedal is depressed).
  4. Turn the ignition switch to the LOCK (OFF) position.

Are all of the measured voltages satisfied?

  1. YES Go to step «3»(ref-169874-S17914023392004121700000) .
  2. NO Go to step «2»(ref-169874-S04350063422004121700000) .

This code is output when the auto-cruise control switch RESUME switch, SET switch or CANCEL switch stays ON.

The most likely causes for this code to be set are

  1. Malfunction of the auto-cruise control switch.
  2. Malfunction of the clock spring.
  3. Damaged harness or connector.
  4. Malfunction of the auto-cruise control-ECU.

This code is output when a problem is found on the cancel status hold circuit or microcomputer operation monitor circuit, which is incorporated in the auto-cruise control-ECU.

Malfunction of the auto-cruise control-ECU.

Diagnosis

Replace the auto-cruise control-ECU. Check that diagnostic trouble code 16 is not output.

Scheme 7

Scheme 7: Circuit Diagram
Scheme 7: Circuit Diagram
  1. The Idle position signal is ON and the throttle position sensor voltage is 2.5 volts or more for 4 seconds or more.
  2. The Idle position signal is OFF and the throttle position sensor voltage is 0.2 volts or less for 4 seconds or more.
  1. Malfunction of the throttle position sensor.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.
  4. Malfunction of the ECM.

If 2.5 volts or more or 0.2 volts or less is output for 4 seconds or more.

The most likely causes for this code to be set are

  1. Malfunction of the throttle position sensor.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.

SYMPTOM LIST

SymptomsInspection Procedure No.
Communication With Scan Tool MB991502 Is Not Possible
Communication With Auto-Cruise Control-ECU Is Not Possible1
Auto-Cruise Control Is Not Cancelled
When Brake Pedal Is Depressed2
When Clutch Pedal Is Depressed (M/T)3
When Selector Lever Is Moved To "N" Range (A/T)4
When CANCEL switch is turned ON5
Auto-Cruise Control Cannot Be Set6
Hunting (Repeated Acceleration And Deceleration) Occurs At The Set Vehicle Speed7 (M/T) or 7 (A/T)
Auto-Cruise Control Indicator Light Inside Combination Meter Does Not Illuminate (However, Auto-Cruise Control Is Normal)8

SYMPTOM CHART

Scheme 8

Scheme 8: Circuit Diagram
Scheme 8: Circuit Diagram
  1. Damaged harness or connector.
  2. Malfunction of the auto-cruise control-ECU.
  1. Malfunction of the stoplight switch.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.
  1. Malfunction of the clutch pedal position switch.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.
  1. Malfunction of the Park/Neutral position switch.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.

Malfunction of the auto-cruise control switch.

Replace the auto-cruise control switch. see scheme 71 Then check that the malfunction is eliminated.

  1. Malfunction of the auto-cruise control switch.
  2. Malfunction of the auto-cruise control-ECU.

Step 1: Can The Auto-Cruise Control-ECU Communicate With Scan Tool MB991502?

CAUTIONTo prevent damage to scan tool MB991502, always turn the ignition switch to the 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 the ON position.

Can the auto-cruise control-ECU communicate with the scan tool?

  1. YES Go to step «2»(ref-169874-S30291735142004121700000) .
  2. NO Inspect each trouble symptom. See «INSPECTION PROCEDURE 1: COMMUNICATION WITH SCAN TOOL MB991502 IS NOT POSSIBLE (COMMUNICATION WITH THE AUTO-CRUISE CONTROL-ECU ONLY IS NOT POSSIBLE)»(ref-169874-S35359062862004121700000) .

Step 2: Is Any Diagnostic Trouble Code Output?

Is any diagnostic trouble code output?

  1. YES Diagnostic trouble code number 11, 12, 14, 15, 16 or 17 is output, see «DIAGNOSTIC TROUBLE CODE CHART»(ref-169874-S13727435022004121700000) . Then check that the malfunction is eliminated.
  2. NO Go to step «3»(ref-169874-S05152182042004121700000) .

Step 3: Using Scan Tool MB991502, Check Data List

CAUTIONTo prevent damage to scan tool MB991502, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991502.
  1. Connect scan tool MB991502 to the data link connector.
  2. Check the following items in the data list. See «SYMPTOM LIST»(ref-169874-S30157074012004121700000) . Item 04 Auto-Cruise Control "CANCEL" switch. Item 05 Stoplight switch. Item 14 Clutch pedal position switch (M/T). Item 14 Park/Neutral position switch (A/T).
  3. Turn the ignition switch to the ON position.

Does the check meet the specifications?

  1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then that the malfunction is eliminated.
  2. NO Follow the diagnostic trouble code procedures and the symptom procedures. Item 04 See «DTC 15: AUTO-CRUISE CONTROL SWITCH SYSTEM»(ref-169874-S33316840782004121700000) . Item 05 See «INSPECTION PROCEDURE 2: WHEN THE BRAKE PEDAL IS DEPRESSED, AUTO-CRUISE CONTROL IS NOT CANCELLED»(ref-169874-S05184211262004121700000) . Item 14 See «INSPECTION PROCEDURE 3: WHEN THE CLUTCH IS DEPRESSED, AUTO-CRUISE CONTROL IS NOT CANCELLED (M/T)»(ref-169874-S35283882372004121700000) . Item 14 See «INSPECTION PROCEDURE 4: WHEN THE SELECTOR LEVER IS MOVED TO "N" RANGE, AUTO-CRUISE CONTROL IS NOT CANCELLED (A/T)»(ref-169874-S09980925332004121700000) .
  1. Malfunction of the vehicle speed sensor.
  2. Malfunction of the auto-cruise control vacuum pump.
  3. Malfunction of the actuator.
  4. Malfunction of the auto-cruise control-ECU.
  1. Malfunction of the output shaft speed sensor.
  2. Malfunction of the PCM.
  3. Malfunction of the auto-cruise control vacuum pump.
  4. Malfunction of the actuator.
  5. Malfunction of the auto-cruise control-ECU.
  1. Malfunction of the indicator bulb.
  2. Damaged harness or connector.
  3. Malfunction of the auto-cruise control-ECU.

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