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1) To clear trouble codes, disconnect battery cable, or use alternative method to prevent memory loss. 2) Turn ignition on. Turn main cruise control switch and SET switch to ON position, and within one second, turn RES switch to ON position. Hold stoplight switch and cruise control switch in ON position for greater than 5 seconds. Verify codes are cleared. DIAGNOSTIC TESTS CODE 11: VACUUM PUMP DRIVE SYSTEM Code 11 is displayed if release valve, control valve and motor drive signals from vacuum pump are not input to cruise control ECU. Probable causes are: * Malfunction of vacuum pump. * Malfunction of stoplight switch. * Malfunction of connector. * Malfunction of harness. * Malfunction of cruise control ECU. 1) Check vacuum pump. See VACUUM PUMP TEST under COMPONENT TESTS. If vacuum pump is defective, replace vacuum pump. If vacuum pump is okay, go to next step. 2) Disconnect cruise control actuator harness connector A-57 or A-95. See Fig. 5. At harness side of connector, check voltage between terminal No. 1 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check stoplight switch. See BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. Replace switch if defective. Check cruise control main switch harness connector C-01 and stoplight switch harness connector C-55. Repair as necessary. If malfunction remains, check harness between cruise control main switch and vacuum pump. Repair as necessary. 3) Disconnect cruise control ECU connector C-50. See Fig. 13. At harness side of connector, check voltage between ground and terminals No. 12 (driving release valve), No. 13 (driving control valve), and No. 26 (driving motor). If battery voltage is present, go to next step. If battery voltage is not present, check and repair connectors A-57 or A-95 and C-111 as necessary. See Figs. 5 and 24. If malfunction remains, check and repair harness between vacuum pump and cruise control ECU as necessary. 4) Check cruise control ECU connector C-50. Repair as necessary. If malfunction remains, replace cruise control ECU. CODE 12: VEHICLE SPEED SENSOR SIGNAL Code 12 is displayed if vehicle speed signals from vehicle speed sensor are not input to cruise control ECU when vehicle speed is 25 MPH or more. Probable causes are: * Malfunction of VSS. * Malfunction of connector. * Malfunction of harness. * Malfunction of cruise control ECU. 1) Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST under COMPONENT TESTS. If speed sensor is okay, go to next step. If speed sensor is defective, repair or replace as necessary. 2) Disconnect combination meter connector C-06. See Fig. 10. At harness side of connector, with ignition switch in ON position, measure voltage between terminal No. 1 and ground. If voltage is 4.5 volts or more, go to next step. If voltage is less than 4.5 volts, |