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Speed Control On/Off Switch: Cherokee

  1. Turn ignition on. Using scan tool, monitor S/C switch inputs. Press S/C ON/OFF switch several times. If scan tool displays speed control switch ON and OFF, test is complete. If scan tool does not display speed control switch ON and OFF, go to next step.
  2. Turn ignition on. Using scan tool, read S/C switch voltage. If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, go to step  5 .
  3. Disconnect S/C ON/OFF switch. See SPEED CONTROL SWITCHES  under REMOVAL & INSTALLATION. Inspect connector. Clean or repair as necessary. Using a voltmeter, check voltage on S/C ON/OFF switch connector terminal No. 2 (Red/Light Green wire). If voltage is more than 6 volts, repair short to voltage. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is less than 4 volts, repair high resistance or open circuit. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is 4-6 volts, go to next step.
  4. Turn ignition off. Connect a jumper wire between S/C ON/OFF switch connector terminal No. 2 (Red/Light Green wire) and ground. Turn ignition on. Using scan tool, read S/C switch voltage. If voltage is less than one volt, replace S/C ON/OFF switch. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is one volt or more, replace PCM. Perform TEST VER-4A  under VERIFICATION TESTS.
  5. Disconnect S/C ON/OFF switch. Inspect connectors. Clean or repair as necessary. Turn ignition on. Using scan tool, read S/C switch voltage. If voltage is more than 4 volts, replace S/C ON/OFF switch. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is 4 volts or less, go to next step.
  6. Disconnect S/C RESUME/ACCEL switch. Using scan tool, read S/C switch voltage. If voltage is more than 4 volts, replace RESUME/ACCEL switch. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is 4 volts or less, go to next step.
  7. Disconnect clockspring connector. Inspect connector. Clean or repair as necessary. Using scan tool, read S/C switch voltage. If voltage is more than 4 volts, replace clockspring. Perform TEST VER-4A  under VERIFICATION TESTS. If voltage is 4 volts or less, go to next step.
  8. Turn ignition off. Disconnect PCM. Inspect connectors. Clean or repair as necessary. Using an ohmmeter, check resistance between ground and S/C switch signal circuit. If resistance is less than 5 ohms, repair short to ground. Perform TEST VER-4A  under VERIFICATION TESTS. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-4A  under VERIFICATION TESTS.
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