Chrysler Colt/Vista 1990-1993 Repair Information

Diagnosis and Testing

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SERVICE PRECAUTIONS





Never disconnect any electrical connection with the ignition switch ON unless instructed to do so in a test.
 
Always wear a grounded wrist static strap when servicing any control module or component labeled with a Electrostatic Discharge (ESD) sensitive device symbol.
 
Avoid touching module connector pins.
 
Leave new components and modules in the shipping package until ready to install them.
 
Always touch a vehicle ground after sliding across a vehicle seat or walking across vinyl or carpeted floors to avoid static charge damage.
 
Never allow welding cables to lie on, near or across any vehicle electrical wiring.
 
Do not allow extension cords for power tools or drop lights to lie on, near or across any vehicle electrical wiring.
 
Do not operate the cruise control or the engine with the drive wheels off the ground unless specifically instructed to do so by a test procedure.
 

SELF DIAGNOSIS FUNCTION



The cruise control system can display trouble codes from the cruise control unit through the diagnostic connector. The codes can be read by using a voltmeter or. Be sure to turn the main switch ON before trying to read the codes.

Connect a voltmeter between the ground terminal and the terminal of for the cruise control of the diagnosis connector. It is possible to discover which circuit is the cause of the cancellation by verifying the indication shown on the voltmeter with the display patterns.

The display of the trouble codes starts if the vehicle speed decreases to less than approximately 12 mph after the cancellation of the cruise control system function and stops if the vehicle speed increases to approximately 12 mph or higher.

INPUT CHECK

Input checks should be made when the cruise control system cannot be set and when it is necessary to check (when a malfunction related to the cruise control system occurs) whether or not the input signals are normal.

  1. If inspection of the self-diagnosis is necessary, confirm diagnosis code first and conduct the input check.
  2.  
  3. The input check can be conducted by set operations. Self-diagnosis terminal outputs display pattern.
  4.  
  5. Display codes are displayed only if the circuit is normal.
  6.  
  7. The voltmeter is set in the same way as for the self-diagnosis check.
  8.  
  9. Turn the ignition switch to the ON position.
  10.  
  11. Switch ON the main/cruise switch while pressing and holding the set and resume control switches at the same time.
  12.  
  13. With the set switch in the ON position, turn the main/cruise switch ON position.
  14.  
  15. With the set switch in the ON position, turn the main/cruise switch ON position. Then, within 1 second, place the resume switch in the ON position.
  16.  
  17. Perform each input operation according to the input check chart.
  18.  
  19. Turn the main/cruise switch to the OFF position.
  20.  

BEFORE TROUBLESHOOTING

The cruise control system performs control functions for the setting or cancellation of the fixed speed driving speed based upon the data provided by input signals. As a result, when the cruise control system is canceled, the cause of cancellation is memorized in a separate circuit by the ECU, regardless of whether or not the cruise control system condition is normal or abnormal, thus providing the ECU with the self diagnosis function by certain fixed patterns as well as the function of being able to check whether or not the ECU's input switches or sensor are normal. Thus, by effectively using these functions, the time required checking and repairing the system can be shortened.

When the ECU power supply (ignition switch and main switch) is switched OFF, the memorized trouble codes are erased, and so for this reason the power supply must be left ON until the checking is completed.

SELF DIAGNOSIS CHECKING

The self diagnosis checking is performed when there has been an automatic cancellation, without cancel switch operation. The following method can be used for checking the diagnosis. Note that the diagnosis check connector is located under the driver's side instrument panel.

Connect a voltmeter between the ground terminal and the terminal of for the cruise control of the diagnosis connector. It is possible to discover which circuit is the cause of the cancellation by verifying the indication shown on the voltmeter with the display patterns.

When trouble codes number 11, 12, 15 or 16 are displayed, check the troubleshooting symptom applicable to that number.

Code number 16 is entered in the memory as cancel switch ON signal input if the system is canceled by depressing the brake pedal, and code number 13 or 14 is entered when there is an automatic cancellation because the vehicle speed drops when the vehicle is driven up a steep slope with the preset speed setting left set etc., when however, there is a cancellation not intentionally made by the driver, the cause might be damaged or disconnected stop lamp switch input wiring, a malfunction of the stop lamp switch ON, etc., even though the same code number 16 is displayed.

Component Testing

CRUISE CONTROL SWITCH
Inspection

See Figures 1 and 2



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Fig. Fig. 1: Test connectors for control switch testing - 1990-92 Colt



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Fig. Fig. 2: Test connectors for control switch testing - 1993 Colt

  1. Remove the knee protector (or lower panel assembly) and the steering column over.
  2.  
  3. Disconnect the steering column switch connector and check the continuity between the terminals.
  4.  
  5. When the switch is in the OFF position there should be no continuity between the terminals.
  6.  
  7. When the set switch is in the ON position there should be continuity between terminals 7 and 9.
  8.  
  9. When the set switch is in the ON position there should be continuity between terminals 7, 9 and 8.
  10.  
  11. If the switch fails any portion of this inspection, replace it with a new one.
  12.  

BRAKE LAMP SWITCH
Inspection
COLT

See Figure 3



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Fig. Fig. 3: Test connection for brake lamp switch testing - Colt

  1. Using a suitable ohmmeter, check for continuity between the terminals.
  2.  
  3. While depressing the brake pedal, there should be continuity between terminals 2 and 3 of the brake lamp switch connector.
  4.  
  5. While not depressing the brake pedal, there should be continuity between terminals 1 and 4 of the brake lamp switch connector.
  6.  
  7. If the brake lamp switch fails any portion of this test, replace it with a new one.
  8.  

VISTA

See Figure 4



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Fig. Fig. 4: Test connection for brake lamp switch testing - Vista

  1. Using a suitable ohmmeter, check for continuity between the terminals.
  2.  
  3. While depressing the brake pedal, there should be continuity between terminals 1 and 2 of the brake lamp switch connector.
  4.  
  5. While not depressing the brake pedal, there should be continuity between terminals 3 and 4 of the brake lamp switch connector.
  6.  
  7. If the brake lamp switch fails any portion of this test, replace it with a new one.
  8.  

CLUTCH SWITCH
Inspection
  1. Using a suitable ohmmeter, check for continuity between the terminal.
  2.  
  3. While depressing the clutch pedal, there should be continuity between terminals of the clutch switch connect.
  4.  
  5. While not depressing the clutch pedal, there should be no continuity between the terminals of the clutch switch connect.
  6.  
  7. If the clutch switch fails any portion of this test, replace it with a new one.
  8.  

INHIBITOR SWITCH
Inspection
COLT

See Figure 5



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Fig. Fig. 5: Test connection for inhibitor switch testing - Colt

  1. Disconnect the inhibitor switch connector.
  2.  
  3. Using a suitable ohmmeter, check that there is continuity between connector terminals 8 and 9 when the shift lever is moved from the N range and the P range.
  4.  
  5. If the inhibitor switch fails any portion of this test, replace it with a new one.
  6.  

VISTA

See Figure 6



Click image to see an enlarged view

Fig. Fig. 6: Test connection for inhibitor switch testing - Vista

  1. Disconnect the inhibitor switch connector.
  2.  
  3. Using a suitable ohmmeter, check that there is continuity between connector terminals BY and BY when the shift lever is moved from the N range and the P range.
  4.  
  5. If the inhibitor switch fails any portion of this test, replace it with a new one.
  6.  

CRUISE CONTROL VACUUM PUMP
Inspection
  1. Remove the auto cruise control vacuum pump connector.
  2.  
  3. Measure the resistance value between terminals 1 and 2 and between terminals 1 and 3.
  4.  
  5. The standard value should be 50-60 ohms.
  6.  
  7. Check that the solenoid valve makes an operating noise when battery voltage is impressed between terminals 1 and 2 and between 1 and 3.
  8.  
  9. If there is a malfunction of the solenoid valve, replace the auto cruise control vacuum pump assembly.
  10.  
  11. To inspect the motor use the following procedure:
    1. Remove the auto cruise control vacuum pump connect
    2.  
    3. Check that the motor revolves when battery voltage is impressed between terminals 1 and 4.
    4.  

  12.  

ACTUATOR
Inspection

See Figure 7



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Fig. Fig. 7: Actuator test connector

COLT
  1. Disconnect the connector.
  2.  
  3. Measure the resistance value of the clutch coil.
  4.  
  5. Resistance of the clutch coil between connector terminals 1 and 2.
  6.  
  7. The standard value should be approximately 20 ohms.
  8.  
  9. If the actuator fails any portion of this test, replace it with a new one.
  10.  

VISTA
  1. Disconnect the connect
  2.  
  3. Measure the resistance value of the clutch cover.
  4.  
  5. Resistance of the clutch coil between connector terminals 1 and 4.
  6.  
  7. The standard value should be approximately 20 ohm.
  8.  
  9. If the actuator fails any portion of this test, replace it with a new one.
  10.  

VEHICLE SPEED SENSOR
Inspection

See Figure 8



Click image to see an enlarged view

Fig. Fig. 8: Checking speed sensor

  1. Remove the combination meter from the instrument panel.
  2.  
  3. Connector the tester (resistance X 100 ohm range) to terminal 3 (negative side) and terminal 4 (reed switch positive side), or lead connector terminal and then slowly turn the shaft of the speedometer cable (turn by using a thin rod or similar tool). Note that the lead terminal is connected to terminal 4.
  4.  
  5. There should be 4 changes of continuity/non-continuity between terminals for each turn of the shaft.
  6.  
  7. Replace the speedometer assembly if there is a malfunction.
  8.  

Component Replacement

See Figures 9, 10, 11 and 12



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Fig. Fig. 9: Cruise control system components - 1990-91 Colt Hatchback and sedan



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Fig. Fig. 10: Cruise control system components - 1990-91 Vista



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Fig. Fig. 11: Cruise control system components - 1992-93 Colt Hatchback and sedan



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Fig. Fig. 12: Cruise control system components - 1992-93 Vista

ACCELERATOR CABLE, THROTTLE CABLE AND AUTO CRUISE CONTROL CABLE



Adjustment
1990 COLT
  1. Check the inner cables for correct slack.
  2.  
  3. If there is too much slack or no slack, adjust the play by the following procedures:
    1. Remove the air cleaner assembly.
    2.  
    3. Adjust the accelerator cable on the throttle valve side. After loosening the adjustment bolts at the air intake plenum side and freeing the inner cable use the adjustment bolts to secure the plate so that the free lay of the inner cable becomes the standard value of 0.04-0.08 in. (1-2mm).NOTE:If there is excessive play of the accelerator cable, the vehicle speed drop (undershoot) when climbing a slope will be large. If there is no play (excessive tension) of the accelerator cable, the idling speed will increase.
    4.  
    5. After adjusting the accelerator cable, confirm that the throttle lever touches the idle position switch.
    6.  
    7. Adjust the accelerator cable on the accelerator pedal side. Loosen the adjusting bolt. While keeping the intermediate link of the actuator in close contact with the stopper, adjust the inner cable play of the accelerator cable to specifications and tighten the adjusting bolt. The standard value should be:

      0-0.04 in. (0-1mm) for vehicles equipped with a manual transaxle.
       
      0.08-0.12 in. (2-3mm) for vehicles equipped with a automatic transaxle.
       

    8.  

  4.  
  5. After making the adjustment of the cable, check to be sure that the throttle lever at the engine side is caused to move a distance of 0.04-0.08 in. (1-2mm) when the actuator link is turned.
  6.  
  7. Confirm that the throttle valve fully opens and closes by operating the pedal.
  8.  
  9. Install the air cleaner.
  10.  

1991-93 COLT
  1. Remove the air cleaner.
  2.  
  3. Remove the link protector.
  4.  
  5. Make sure that the accelerator cable, throttle cable and auto cruise control cable are free of sharp bends and folds.
  6.  
  7. Turn the ignition switch to the ON position (without starting the engine) and leave it in that condition for approximately 15 seconds.
  8.  
  9. Provide each cable with sufficient play and temporarily install the adjusting nuts as well as the adjusting bolt.
  10.  
  11. Move the plate so that when lower link is in contact with the stopper, play of the accelerator cable (inner cable) may be of standard value and secure the adjusting nut. The standard value should be:

    0-0.04 in. (0-1mm) for vehicles equipped with a manual transaxle.
     
    0.08-0.12 in. (2-3mm) for vehicles equipped with a automatic transaxle.
     

  12.  
  13. With the end of the link that is attached to the bottom of the throttle cable kept in contact with the stopper of the link on the accelerator cable, adjust the play of the throttle cable (inner cable) of the standard value by means of the adjusting bolt. Standard value is 0.04-.08 in. (1-2mm).
  14.  
  15. Use the locknut and adjusting bolt to secure the throttle cable.
  16.  
  17. With the end of link on the cruise control cable kept in contact with stopper of the link on the throttle cable, adjust play of the auto cruise control cable (inner cable) to the standard value by using the adjusting nut. Standard value is 0.04-0.08 in. (1-2mm).
  18.  
  19. Secure the auto cruise control cable with the locknut. After adjusting, confirm that throttle valve fully opens and closes by operating pedal.
  20.  

VISTA
  1. Run the engine until it reaches the specified idle speed.
  2.  
  3. Stop the engine and turn the ignition switch to the OFF position.
  4.  
  5. Check the accelerator cable for a sharp bend.
  6.  
  7. If there is too much slack or no slack, adjust the play by the following procedures:
    1. Remove the air cleaner assembly.
    2.  
    3. Tun the ignition switch to the ON position (without starting the engine) and leave it in that condition for approximately 15 seconds.
    4.  
    5. Loosen the adjusting nut so that the throttle lever is free.
    6.  
    7. Turn the accelerator adjusting nut to the point where the throttle lever just starts moving, then back off one turn and lock the adjusting nut with the locknut.
    8.  
    9. The accelerator cable should now be adjusted to the standard value of 0.04-0.08 in. (1-2mm).
    10.  
    11. Confirm that the idle position switch touches the stopper after the idle speed control adjustment.
    12.  

  8.  

 
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