Файл: 92FWD_24.pdf

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FAILURE CODE 11ÐAMBIENT TEMPERATURE SENSOR FAILURE

(1) Disconnect 21-way connector at control. With an ohmmeter, measure the resistance between pin #9 and pin #7. Refer to the Temperature ReferenceÐFailure Code 11 chart.

TEMPERATURE REFERENCEÐFAILURE

CODE 11

(2) Check for continuity between pin #9 and chassis ground. If continuity is present, repair and retest.

FAILURE CODE 12ÐIN-CAR TEMPERATURE SENSOR/ASPIRATOR FAILURE

(1)Disconnect 21-way connector at control. With an ohmmeter, measure the resistance between pin #20 and pin #7. Refer to Temperature ReferenceÐFailure Code 11 chart for electrical values.

(2)Check for continuity between pin #20 and chassis ground. If continuity is present, repair and retest.

FAILURE CODE 13ÐBLEND DOOR FAILED TO DRIVE TO HEAT POSITION

(1)Check door and linkage for binding.

(2)Disconnect 21-way connector from control head and the 5-way connector from the blend air door actuator. Check continuity between pin #6 of the 21way connector and pin #5 of the 5-way connector. If continuity is shown, go to step 3. If continuity is not shown, repair circuit for an open circuit and retest system.

(3)Plug in the 5-way connector and check for resistance between pins #4 and #6 of the 21-way connector. A resistance of 20-50 ohms should be present. If not, replace actuator. If correct, proceed to step 4.

(4)If steps 1 and 2 indicate no failures, replace the ATC control head.

HEATING AND AIR CONDITIONING 24 - 69

FAILURE CODE 14ÐBLEND DOOR FAILED TO DRIVE TO COLD POSITION

First check the 5-way connector to the blend air door actuator for proper connection

(1)Check door and linkage for binding.

(2)Remove the 21-way connector from the control. With ignition ON, check for ignition voltage between pin #8 of the 21-way connector and chassis ground. If voltage is present, repair circuit for short to ignition voltage. If voltage is not present, proceed to step 3.

(3)Turn ignition OFF. With the 21-way still removed, disconnect the 5-way connector from the blend air door actuator. Check for continuity between pin #8 of the 21-way connector and pin #1 of the 5-way connector. If continuity is not present, repair open circuit. If present, continue to step 4.

(4)Install the 5-way connector back into the blend air door actuator and check for continuity between the pins #7 and #8 of the 21-way connector. If continuity is present, replace the ATC control. If continuity is not present, replace the blend air door actuator.

FAILURE CODE 15ÐBLEND DOOR FEEDBACK SHORTED TO GROUND

(1)Remove the 21-way connector from the control and the 5-way connector from the blend air door actuator.

(2)Check for continuity between pin #8 of the 21way connector and chassis ground. If present, repair circuit for short to ground. If not present, continue to step 3.

(3)Plug in the 5-way connector and measure resistance between pins #7 and #8 of the 21-way connector. If the resistance is less than 10 ohms, replace the actuator. If not, replace the control head.

FAILURE CODE 16ÐMODE DOOR MOVED DURING BLEND DOOR TEST

(1)Remove the 21-way connector from the control and the 5-way connector from the three actuators.

(2)Check for continuity between pin #4 of the 21way connector and pin #4 of each actuator. If continuity is not present for a particular actuator circuit, repair that circuit and retest system. If continuity is present for all circuits, continue to step 3.

(3)Plug in the 5-way connectors and check for resistance between pins #4 and #6 of the 21-way connector for the blend air actuator. Then check pins #4 and #5 of the 21-way for the mode actuator. The resistance should be between 20-50 ohms. If either of the actuators do not pass the resistance tests, replace that particular actuator and retest the system. If both pass the resistance test, replace the ATC control.

24 - 70 HEATING AND AIR CONDITIONING

FAILURE CODE 17ÐMODE DOOR FAILED TO DRIVE TO DEFROST

(1)Disconnect 21-way connector from control head and the 5-way connector from the blend air door actuator. Check continuity between pin #5 of the 21way connector and pin #5 of the 5-way connector. If continuity is present, proceed to step 2. If continuity is not present, repair open circuit and retest system.

(2)Plug in the 5-way connector and check for resistance between pins #4 and #5 of the 21-way connector. A resistance of 20-50 ohms should be present. If not, replace actuator. If correct, proceed to step 3.

(3)If steps 1 and 2 do not indicate any failures, replace the ATC control head.

FAILURE CODE 18ÐMODE DOOR FAILED TO DRIVE TO PANEL

Check the 5-way connector to the mode door actuator for proper installation.

(1)Check the door and linkage for binding.

(2)Remove the 21-way connector from the control. With ignition ON, check for ignition voltage between pin #16 of the 21-way connector and chassis ground. If voltage is present, repair circuit for short to ignition voltage. If voltage is not present, proceed to step 3.

(3)Turn ignition OFF. With the 21-way connector still removed, disconnect the 5-way connector from the mode door actuator. Check for continuity between pin #16 of the 21-way connector, and pin #1 of the 5-way connector. If continuity is not present, repair circuit for an open. If present, continue to step 4.

(4)Install 5-way connector back into the mode door actuator. Then check for continuity between pins #7 and #16 of the 21-way connector. If continuity is present, replace the ATC control. If continuity is not present, replace the mode door actuator.

FAILURE CODE 19ÐMODE DOOR FEEDBACK SHORTED TO GROUND

(1)Remove the 21-way connector from the control, and the 5 way connector from the mode door actuator.

(2)Check for continuity between pin #16 of the 21-way connector and chassis ground. If present, repair circuit for short to ground. If not present, continue to step 3.

(3)Plug in the 5-way connector and measure resistance between pins #7 and #16 of the 21-way connector. If the resistance is less than 10 ohms, replace the actuator. If not, replace the control head.

FAILURE CODE 20ÐBLEND DOOR MOVED DURING MODE DOOR TEST

(1) Remove the 21-way connector from the control and the 5-way connector from the three actuators.

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(2)Check for continuity between pin #4 of the 21way connector and pin #4 of each actuator. If continuity is not present for a particular actuator circuit, repair that circuit and retest system. If continuity is present for all circuits, continue to step 3.

(3)Plug in the 5-way connectors and check for resistance between pins #4 and #6 of the 21-way connector for the blend air actuator. Then check pins #4 and #5 of the 21-way connector for the mode actuator. The resistance should be between 20-50 ohms. If either of the actuators do not pass the resistance tests, replace that particular actuator and retest the system. If both pass the resistance test, replace the ATC control.

FAILURE CODE 21ÐROM CHECK SUM ERROR

During the Diagnostics test, the computer will verify it's own internal program. If it finds any part to be bad, a Failure Code 21 will be set. This Failure Code is not serviceable. If a Fail Code 21 occurs, the ATC Control Module must be replaced.

FAILURE CODE 22ÐCOMPUTER ERROR

If incorrect data is found in the ATC Control computer module, a Failure Code 22 will be set. This Fail Code is not serviceable. If a Failure Code 22 occurs, the ATC Control Module must be replaced.

FAILURE CODE 23ÐBLEND DOOR FEEDBACK FAILED

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 23 will be stored within the ATC Control, and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 from ATC Control.

Follow service procedures for Failure Codes 14 and 15 when repairing.

FAILURE CODE 24ÐMODE DOOR FEEDBACK FAILED

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 24 will be stored within the ATC Control, and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 From ATC Control.

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Follow service procedures for Failure Codes 18 and 19 when repairing.

FAILURE CODE 25ÐAMBIENT TEMPERATURE SENSOR FAILURE

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 25 will be stored within the ATC Control, and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 from ATC Control.

Follow service procedures for Failure Code 11 when repairing.

FAILURE CODE 26ÐIN-CAR TEMPERATURE SENSOR/ASPIRATOR FAILED

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 26 will be stored within the ATC Control, and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 from ATC Control.

Follow service procedures for Failure Code 12 when repairing.

FAILURE CODE 27ÐSUN LOAD SENSOR FAILED

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 27 will be stored within the ATC Control, and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 from ATC Control.

Follow service procedures for Failure Code 12 when repairing.

HEATING AND AIR CONDITIONING 24 - 71

FAILURE CODE 28ÐWATER TEMPERATURE SENSOR FAILED

This Failure Code is set during normal ATC operation. The Failure Code will be set only after the ATC control has been operating for 15 minutes. The control will compensate for the feedback failure immediately upon power up, but the Failure Code will not be set until the time limit has been met.

Failure Code 28 will be stored within the ATC Control and must be cleared after the failure has been repaired. To clear this Failure Code, refer to Erasing Failure Codes 23 through 28 from ATC Control.

Follow service procedures for Failure Code 10 when repairing.

ERASING FAILURE CODES

Failure Codes 23 through 28 are stored within the ATC in the computer memory. These codes may be erased from the memory after the correct repairs have been made. Intermittent Failure Codes 23 through 28 will be stored until they are erased.

(1)Run the DIAGNOSTIC TEST.

(2)Depress the PANEL button to access all Failure Codes. When the Display begins flashing alternating zeros, you can do three things:

²Do nothing, and in five seconds control will return to normal ATC operation. All codes will remain stored in the control.

²Depress any button within five seconds, other than A/C, and stop the test immediately. Control will return to normal ATC operation.

²Depress the A/C button within five seconds, and proceed to the erasing procedure. By depressing the A/C button, you will not erase any Failure Codes. You will only access the next part of the procedure. Proceed to step 3.

(3)After you depress the A/C button the display will alternate E's. This is for ERASE. You can now do two things:

²Do nothing, and in five seconds, all Failure Codes from 23 through 28 will be erased from the ATC control.

²Depress any button within five seconds, and Failure Codes will not be erased.

Control will return to normal ATC operation.