2008 EATC self test

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Nov 15, 2010 | 05:02 PM

#16

senix

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Joined: Aug 2008

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From: Frederick, MD

Turn the system off. Then press off and defrost at the same time. Within 2 seconds hit the auto and then it will enter dianostic mode.

First you will see the fan symbol going from low to high and then I assume if you have something wrong it will show codes.

Hard to tell as nothing is wrong with mine so it just shows everything that it is capable of displaying.

Nov 15, 2010 | 10:15 PM

#17

John7894

Cargo Master

Joined: Jan 2002

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From: LA and CO

Do I hold down off and defrost while pressing auto? Or let them go then press auto?

I think I tried this already. I'll try again in the AM.

Anybody know where the fan is? Do you access it from inside or outside the cab?

Nov 16, 2010 | 04:06 AM

#18

senix

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From: Frederick, MD

Quote:

Originally Posted by John7894

Just hold down the off and the defrost at the same time.

Then let go of those two buttons and then press the auto within 2 seconds.

Nov 16, 2010 | 05:01 AM

#19

senix

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From: Frederick, MD

dpress the reset button, then turn the key to the on setting and will will access the information center. See what you see there?

May 6, 2012 | 06:50 AM

#20

60DRB

Laughing Gas

Joined: Dec 2009

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From: East L.A.

The "self diagnostic" A/C test procedure and a list of fault codes would sure be nice in the "tech guide" section...

May 7, 2012 | 06:27 PM

#21

a12play12

Senior User

Joined: Jul 2004

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From: Nevada,

<TABLE border=0 cellSpacing=0 cellPadding=0 width="100%"><TBODY><TR><TD vAlign=top align=center><TABLE border=0 cellSpacing=10 cellPadding=0 width="90%"><TBODY><TR><TD>HVAC MODULE - EATC ON-DEMAND SELF TEST

The HVAC Module - EATC On-Demand Self Test will retrieve on-demand (hard fault) DTCs only, it will not retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the HVAC Module - EATC On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the HVAC Module - EATC - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.

The HVAC Module - EATC On-Demand Self Test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A scan tool must be used to retrieve these concerns.
The HVAC Module - EATC On-Demand Self Test will detect concerns in the system control functions and will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The vehicle interior temperature should be between 4°C-38°C (40°F-100°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false DTCs may be displayed.
The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when the self-test is activated.
To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press the AUTO button within 2 seconds . The display will show a flashing blower icon for 20 seconds , after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs present. If DTCs are present, the HVAC module - EATC will display "00 00" and then on-demand DTCs. Record all DTCs displayed.
If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the HVAC Module DTC Chart and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Tests and Associated Procedures\HVAC Module DTC Chart
If a condition exists, but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures
To exit the self-test and retain all DTCs, press any button except DEFROST. The HVAC module - EATC will exit the self-test and retain all DTCs.
To exit the self-test and clear all DTCs, press the DEFROST button. The HVAC module - EATC will exit the self-test and all DTCs will be cleared.
Always exit the self-test before powering the system down (system turned OFF). Once the self-test is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>

Good luck, if you get a code, post it and i will see what i can find!

Apr 7, 2015 | 04:45 PM

#22

tobyw

Senior User

Joined: Mar 2000

Posts: 358

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From: Tri-Cities, WA

Quote:

Originally Posted by a12play12

[*]If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the HVAC Module DTC Chart and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Tests and Associated Procedures\HVAC Module DTC Chart

[*]If a condition exists, but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures

I am about to run this on my '08 to try and determine the source of the knocking/ticking/clicking in the dash. Does anyone have a copy of the procedures and charts mentioned above?