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Checking Speed Control Operation

NOTE: Perform this test only if there are no Diagnostic Trouble Codes (DTCs). After repair, perform TEST VER-4A  under VERIFICATION TESTS.
  1. Turn ignition off. Inspect throttle cable and linkage. If no problem is found, go to next step. If throttle is binding or damaged, repair as necessary.
  2. Start engine. Allow to idle for one minute. Disconnect vacuum supply line at S/C servo. See Figure . If vacuum exists, go to next step. If vacuum does not exist, repair as necessary.
  3. Road test vehicle at speeds more than 35 MPH. Attempt to set cruise control. Using scan tool, check S/C DENIED status. If no status denied message exists, go to next step. If any status denied message exists, go to step  5 . See SCAN TOOL DENIED STATUS  table.
    SCAN TOOL DENIED STATUS

    Denied Message Reason
    ON/OFF PCM Does Not Sense ON Signal From Switch At PCM
    SPEED PCM Senses Vehicle Speed Is Less Than 36 MPH
    RPM PCM Senses Engine RPM Is Excessively High
    BRAKE Brake Switch Sense Circuit Is Open Indicating That Brakes Are Applied
    P/N Park/Neutral Switch Sense Circuit Is Grounded Indicating That Transmission Is In Park Or Neutral
    RPM/SPD PCM Senses Excessive Engine RPM For A Given Vehicle Speed
    SOL FLT PCM Senses A Servo Solenoid Circuit Trouble Code That Is Maturing Or Set In Memory
  4. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and PARK NEUTRAL POSIT. Move shifter to Drive position. If scan tool displays D/R, go to next step. If scan tool does not display D/R, diagnose and repair park neutral position switch. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  5. Turn ignition off. Disconnect 3-pin cruise control switch harness connector. Remove ASD relay, located in PDC. Connect a jumper wire between relay connector terminals E1 and E5. Turn ignition on. Check voltage between switch harness connector terminal No. 3 (Red/Light Green wire) and ground. If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage on Red/Light Green wire between switch and PCM.
  6. Turn ignition off. Disconnect 7-pin clockspring connector (column side). Disconnect PCM connectors, located behind master cylinder. Check resistance of Red/Light Green wire between clockspring harness connector terminal No. 6 and PCM harness connector C2 terminal No. 41. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open on Red/Light Green wire between clockspring and PCM.
  7. Using test light connected to battery voltage, probe clockspring harness connector terminal No. 7 (Black/Light Green wire). If test light illuminates, go to next step. If test light does not illuminate, repair open on Black/Light Green wire between clockspring harness connector and ground, located on center instrument panel brace.
  8. Check resistance of Black/Light Green wire between clockspring terminal No. 7 and switch harness connector terminal No. 1. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, replace clockspring.
  9. Connect PCM, switch and clockspring connectors. Turn ignition on. Using scan tool, check S/C SWITCH voltage. Turn ignition off. Disconnect clockspring connector. Turn ignition on. Using scan tool, recheck S/C SWITCH voltage. If voltage did not change to 5 volts, go to next step. If voltage changed to 5 volts, replace clockspring.
  10. Turn ignition off. Disconnect PCM and switch connectors. Check resistance between switch harness connector terminals No. 1 (Black wire) and No. 3 (Red/Light Green wire). If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short between circuits.
  11. Check resistance between switch harness connector terminal No. 3 (Red/Light Green wire) and ground. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground on Red/Light Green wire.
  12. Connect all components. Turn ignition on. Using scan tool, check S/C switch voltage while pressing switch. See S/C SWITCH VOLTAGE  table. If voltage is as specified, test is complete. If voltage is not as specified, replace switch.
S/C SWITCH VOLTAGE

Switch Position Volts
ON/OFF 1.02-1.45
COAST/SET 2.14-2.59
ACC/RES 3.06-3.76
CANCEL 0-0.76
No Button Pressed 4.18-4.94
Fig 1: Identifying Clockspring Harness Connector Terminals
G00010966Courtesy of CHRYSLER CORP.
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