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An open circuit in output signal circuit in Neutral range is likely reason for malfunction. Probable causes are: * Malfunction of park/neutral switch. * Malfunction of connector. * Malfunction of harness. * Malfunction of cruise control ECU. Check condition of park/neutral switch connector B-08, dash harness/transmission harness connector C-124, cruise control ECU connector C-50 and joint connector C-130. Repair as necessary. If connectors are okay and malfunction remains, check harness between park/neutral switch and cruise control ECU. Repair as necessary. If harness is okay, replace cruise control ECU. Test No. 6 An open circuit in circuit inside CANCEL switch is likely caused by a malfunction in cruise control switch. Replace cruise control switch. Test No. 7 Because of an open circuit in battery back-up circuit system, fail-safe function prevents diagnostic trouble codes from being memorized and displayed even though cruise control is canceled. Probable causes are: * Malfunction of connector. * Malfunction of harness. * Malfunction of cruise control ECU. 1) Disconnect cruise control ECU connector C-50. See Fig. 13. At harness side of connector, measure voltage between terminal No. 16 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check and repair IOD connector A-09X, joint connector C-132, junction block connector C-81 and junction block connector C-93 as necessary. See Figs. 4, 16, 19, 20, 26 and 30. If connectors are okay and malfunction remains, check harness between cruise control ECU and power supply. Repair as necessary. 2) Check condition of cruise control ECU connector C-50. Repair as necessary. If connector is okay and malfunction remains, replace cruise control ECU. Test No. 8 A malfunction of switches or fail-safe function cancelling cruise control may be present. Probable causes are: * Malfunction of cruise control main switch. * Malfunction of cruise control switch. * Malfunction of clockspring. * Malfunction of harnesses or connectors. * Malfunction of park/neutral position switch. * Malfunction of cruise control ECU. 1) Attach scan tool to DLC. If scan tool can communicate with cruise control, go to next step. If scan tool cannot communicate with cruise control, go to TEST NO. 2. 2) If input switch inspection is possible with scan tool, go to next step. If input switch inspection is not possible, go to TEST NO. 3. 3) If input switch Code 21, 22 or 27 are still displayed, replace cruise control main switch. If codes are no longer displayed, go to next step. 4) If input switch Code 23 is still displayed, go to TEST NO. |