hvac codes help
Thread Starter
Instructor
Joined: Jun 2008
Posts: 178
Likes: 0
From: Slidell Louisiana
hvac codes help
first of all how do i pull any codes and see them on my digital read out in my 98 vert.... im having a problem with my ac blowing cold out of the passenger side and warm out of the driver side..... i know there are thousands of post on this very subject, but Im not sure about the code thing,,,, does the codes come up on there own in the digital read out window or is there a sequence of button presses that you can do to see if your vette is throwing any codes,,,, im lost please help
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Here you go...
http://www.stengel.net/diccodes.htm
How to Pull Codes:
1. Turn your key to the "ON" position, but do not start the engine.
2. Clear any present messages by pressing the RESET button.
3. Hold the OPTIONS button down, and press the FUEL button 4 times. (This will get you into the "codes" section of the DIC.
4. The computer will automatically display all the codes your car has created. It will cycle through each code every 3 seconds. (Have a pen and paper handy to write down the codes)
Note: Any code that ends in an "H" is a history code (something that has occurred in the past, but is not reporting as an error currently.)
5. Once the computer has finished going through all of its codes, press RESET to enter Manual Configuration mode. It should start with a module and show "NO CODES" or "# Codes."
6. To optionally reset codes once in manual mode, press and hold RESET until is displays "NO CODES."
7. Press OPTIONS to go into the next module (ie, from PCM, or Powertrain Control Module, to TCS, or Traction Control System.)
8. Repeat Step 6 until you have reset all the codes in all the computer modules.
Note: Only reset the codes if you want to- it is not necessary to reset them every time you pull the codes.
9. When finished, simply take your key out of the ignition.
http://www.stengel.net/diccodes.htm
How to Pull Codes:
1. Turn your key to the "ON" position, but do not start the engine.
2. Clear any present messages by pressing the RESET button.
3. Hold the OPTIONS button down, and press the FUEL button 4 times. (This will get you into the "codes" section of the DIC.
4. The computer will automatically display all the codes your car has created. It will cycle through each code every 3 seconds. (Have a pen and paper handy to write down the codes)
Note: Any code that ends in an "H" is a history code (something that has occurred in the past, but is not reporting as an error currently.)
5. Once the computer has finished going through all of its codes, press RESET to enter Manual Configuration mode. It should start with a module and show "NO CODES" or "# Codes."
6. To optionally reset codes once in manual mode, press and hold RESET until is displays "NO CODES."
7. Press OPTIONS to go into the next module (ie, from PCM, or Powertrain Control Module, to TCS, or Traction Control System.)
8. Repeat Step 6 until you have reset all the codes in all the computer modules.
Note: Only reset the codes if you want to- it is not necessary to reset them every time you pull the codes.
9. When finished, simply take your key out of the ignition.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
This may help but if you have a specific code, PM me and I can send you the troubleshooting guide for that code
Document ID# 317683
1998 Chevrolet/Geo Corvette
Air Delivery Improper CJ2
Air Delivery Improper <<CJ2>>
Step
Action
Value(s)
Yes
No
DEFINITION: Air flow is not being delivered from the proper mode outlet which was requested by the operator (CJ2).
1
Were you sent here from the HVAC System Check (CJ2)?
--
Go to Step 2
Go to HVAC System Check (CJ2)
2
1. Disconnect the vacuum line connector from the vacuum/electric solenoid.
2. Connect a vacuum gauge to the purple vacuum line.
3. Start the engine and allow it to idle in park.
4. Measure the vacuum at the purple/black (engine source) vacuum line.
Is the vacuum reading within the specified values?
10-17 in.Hg
Go to Step 3
Go to Step 27
3
1. Disconnect the vacuum gauge from the purple vacuum line connector.
2. Connect a vacuum pump to each of the individual vacuum lines feeding each of the vacuum actuators at the vacuum/electric solenoid connector.
3. Apply 15 to 20 inches of vacuum to each of the vacuum actuators through the corresponding vacuum line.
4. When applying vacuum, listen for movement of the actuator door or vacuums leaks.
Do each of the vacuum actuators hold vacuum and apply the actuator door properly when vacuum is applied?
--
Go to Step 5
Go to Step 4
4
1. Disconnect the inoperative vacuum actuator from the appropriate vacuum line connector.
2. Connect a vacuum pump to the vacuum actuator.
3. Apply 15 to 20 inches of vacuum to the vacuum actuator.
4. When applying vacuum, listen for movement of the actuator door or vacuums leaks.
Does the vacuum actuator hold vacuum and apply the actuator door properly when vacuum is applied?
--
Go to Step 29
Go to Step 28
5
1. Disconnect the vacuum/electric solenoid connector.
2. Turn the ignition switch to the ON position.
3. Connect a DMM between terminal 6 (CKT 41) of the vacuum/electric solenoid connector and a good ground.
4. Measure the available voltage at the connector.
Is the voltage within the specified values?
10.0-14.0V
Go to Step 9
Go to Step 6
6
Check the HVAC MiniFuse® #18 for an open circuit.
Is the fuse open?
--
Go to Step 7
Go to Step 8
7
Locate and repair a short to ground in CKT 41 between the instrument panel electrical center and the vacuum/electric solenoid connector.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
8
Locate and repair an open or a high resistance in CKT 41 between the instrument panel electrical center and the vacuum/electric solenoid connector.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
9
1. Turn the ignition switch to the OFF position.
2. Disconnect the HVAC control head.
3. Vacuum/electric solenoid connector still disconnected.
4. Connect a DMM between terminal 2 (CKT 1397) of the vacuum/electric solenoid connector and terminal D10 of the HVAC control head connector.
5. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 10
Go to Step 11
10
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D10 and ground.
3. Measure for continuity to ground in CKT 1397.
Is CKT 1397 shorted to ground?
--
Go to Step 30
Go to Step 12
11
Locate and repair an open or high resistance in CKT 1397.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
12
1. Connect the DMM between terminal 1 (CKT 1395) of the vacuum/electric solenoid connector and terminal D11 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 13
Go to Step 14
13
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D11 and ground.
3. Measure for continuity to ground in CKT 1395.
Is CKT 1395 shorted to ground?
--
Go to Step 31
Go to Step 15
14
Locate and repair an open or high resistance in CKT 1395.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
15
1. Connect the DMM between terminal 5 (CKT 1396) of the vacuum/electric solenoid connector and terminal D13 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 16
Go to Step 17
16
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D13 and ground.
3. Measure for continuity to ground in CKT 1396.
Is CKT 1396 shorted to ground?
--
Go to Step 32
Go to Step 18
17
Locate and repair an open or high resistance in CKT 1396.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
18
1. Connect the DMM between terminal 3 (CKT 66) of the vacuum/electric solenoid connector and terminal D9 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 19
Go to Step 20
19
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D9 and ground.
3. Measure for continuity to ground in CKT 66.
Is CKT 66 shorted to ground?
--
Go to Step 33
Go to Step 21
20
Locate and repair an open or high resistance in CKT 66.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
21
1. Connect the DMM between terminal 4 (CKT 1394) of the vacuum/electric solenoid connector and terminal D8 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 22
Go to Step 23
22
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D8 and ground.
3. Measure for continuity to ground in CKT 1394.
Is CKT 1394 shorted to ground?
--
Go to Step 34
Go to Step 24
23
Locate and repair an open or high resistance in CKT 1394.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
24
1. Reconnect the vacuum/electric solenoid connector.
2. Start the engine and allow it to idle.
3. Momentarily connect a fused (15 A) jumper wire between ground and each of the following HVAC control head connector terminals: D8, D9, D10, D11 and D13.
When each terminal is grounded, does the corresponding vacuum/electric solenoid respond and allow the corresponding vacuum actuator to operate?
--
Go to Step 25
Go to Step 26
25
Replace the HVAC control head.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
26
Replace the vacuum/electric solenoid.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
27
Repair a leak or a pinch in the purple/black (engine source) vacuum line between the vacuum/electric solenoid connector and its vacuum source.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
28
1. Check for any poor connections.
2. Check for any binding conditions.
3. If OK, replace the inoperative vacuum actuator.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
29
Repair a leak or a pinch in the vacuum line between the vacuum/electric solenoid connector and the inoperative vacuum actuator.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
30
Locate and repair a short to ground in CKT 1397.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
31
Locate and repair a short to ground in CKT 1395.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
32
Locate and repair a short to ground in CKT 1396.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
33
Locate and repair a short to ground in CKT 66.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
34
Locate and repair a short to ground in CKT 1394.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
Document ID# 317683
1998 Chevrolet/Geo Corvette
Document ID# 317683
1998 Chevrolet/Geo Corvette
Air Delivery Improper CJ2
Air Delivery Improper <<CJ2>>
Step
Action
Value(s)
Yes
No
DEFINITION: Air flow is not being delivered from the proper mode outlet which was requested by the operator (CJ2).
1
Were you sent here from the HVAC System Check (CJ2)?
--
Go to Step 2
Go to HVAC System Check (CJ2)
2
1. Disconnect the vacuum line connector from the vacuum/electric solenoid.
2. Connect a vacuum gauge to the purple vacuum line.
3. Start the engine and allow it to idle in park.
4. Measure the vacuum at the purple/black (engine source) vacuum line.
Is the vacuum reading within the specified values?
10-17 in.Hg
Go to Step 3
Go to Step 27
3
1. Disconnect the vacuum gauge from the purple vacuum line connector.
2. Connect a vacuum pump to each of the individual vacuum lines feeding each of the vacuum actuators at the vacuum/electric solenoid connector.
3. Apply 15 to 20 inches of vacuum to each of the vacuum actuators through the corresponding vacuum line.
4. When applying vacuum, listen for movement of the actuator door or vacuums leaks.
Do each of the vacuum actuators hold vacuum and apply the actuator door properly when vacuum is applied?
--
Go to Step 5
Go to Step 4
4
1. Disconnect the inoperative vacuum actuator from the appropriate vacuum line connector.
2. Connect a vacuum pump to the vacuum actuator.
3. Apply 15 to 20 inches of vacuum to the vacuum actuator.
4. When applying vacuum, listen for movement of the actuator door or vacuums leaks.
Does the vacuum actuator hold vacuum and apply the actuator door properly when vacuum is applied?
--
Go to Step 29
Go to Step 28
5
1. Disconnect the vacuum/electric solenoid connector.
2. Turn the ignition switch to the ON position.
3. Connect a DMM between terminal 6 (CKT 41) of the vacuum/electric solenoid connector and a good ground.
4. Measure the available voltage at the connector.
Is the voltage within the specified values?
10.0-14.0V
Go to Step 9
Go to Step 6
6
Check the HVAC MiniFuse® #18 for an open circuit.
Is the fuse open?
--
Go to Step 7
Go to Step 8
7
Locate and repair a short to ground in CKT 41 between the instrument panel electrical center and the vacuum/electric solenoid connector.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
8
Locate and repair an open or a high resistance in CKT 41 between the instrument panel electrical center and the vacuum/electric solenoid connector.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
9
1. Turn the ignition switch to the OFF position.
2. Disconnect the HVAC control head.
3. Vacuum/electric solenoid connector still disconnected.
4. Connect a DMM between terminal 2 (CKT 1397) of the vacuum/electric solenoid connector and terminal D10 of the HVAC control head connector.
5. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 10
Go to Step 11
10
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D10 and ground.
3. Measure for continuity to ground in CKT 1397.
Is CKT 1397 shorted to ground?
--
Go to Step 30
Go to Step 12
11
Locate and repair an open or high resistance in CKT 1397.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
12
1. Connect the DMM between terminal 1 (CKT 1395) of the vacuum/electric solenoid connector and terminal D11 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 13
Go to Step 14
13
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D11 and ground.
3. Measure for continuity to ground in CKT 1395.
Is CKT 1395 shorted to ground?
--
Go to Step 31
Go to Step 15
14
Locate and repair an open or high resistance in CKT 1395.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
15
1. Connect the DMM between terminal 5 (CKT 1396) of the vacuum/electric solenoid connector and terminal D13 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 16
Go to Step 17
16
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D13 and ground.
3. Measure for continuity to ground in CKT 1396.
Is CKT 1396 shorted to ground?
--
Go to Step 32
Go to Step 18
17
Locate and repair an open or high resistance in CKT 1396.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
18
1. Connect the DMM between terminal 3 (CKT 66) of the vacuum/electric solenoid connector and terminal D9 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 19
Go to Step 20
19
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D9 and ground.
3. Measure for continuity to ground in CKT 66.
Is CKT 66 shorted to ground?
--
Go to Step 33
Go to Step 21
20
Locate and repair an open or high resistance in CKT 66.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
21
1. Connect the DMM between terminal 4 (CKT 1394) of the vacuum/electric solenoid connector and terminal D8 of the HVAC control head connector.
2. Measure for continuity between these two terminals.
Is the resistance between these two connectors less than the specified value?
0.5ohms
Go to Step 22
Go to Step 23
22
1. Vacuum/electric solenoid connector and the HVAC control head connector are still disconnected.
2. Connect a DMM between the HVAC control head connector terminal D8 and ground.
3. Measure for continuity to ground in CKT 1394.
Is CKT 1394 shorted to ground?
--
Go to Step 34
Go to Step 24
23
Locate and repair an open or high resistance in CKT 1394.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
24
1. Reconnect the vacuum/electric solenoid connector.
2. Start the engine and allow it to idle.
3. Momentarily connect a fused (15 A) jumper wire between ground and each of the following HVAC control head connector terminals: D8, D9, D10, D11 and D13.
When each terminal is grounded, does the corresponding vacuum/electric solenoid respond and allow the corresponding vacuum actuator to operate?
--
Go to Step 25
Go to Step 26
25
Replace the HVAC control head.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
26
Replace the vacuum/electric solenoid.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
27
Repair a leak or a pinch in the purple/black (engine source) vacuum line between the vacuum/electric solenoid connector and its vacuum source.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
28
1. Check for any poor connections.
2. Check for any binding conditions.
3. If OK, replace the inoperative vacuum actuator.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
29
Repair a leak or a pinch in the vacuum line between the vacuum/electric solenoid connector and the inoperative vacuum actuator.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
30
Locate and repair a short to ground in CKT 1397.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
31
Locate and repair a short to ground in CKT 1395.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
32
Locate and repair a short to ground in CKT 1396.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
33
Locate and repair a short to ground in CKT 66.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
34
Locate and repair a short to ground in CKT 1394.
Is the repair complete?
--
Go to HVAC System Check (CJ2)
--
Document ID# 317683
1998 Chevrolet/Geo Corvette
Drifting
Joined: Jul 2000
Posts: 1,713
Likes: 3
From: Atlanta GA from Boston MA
This condition is usually accompanied by the B0441 and BO361 codes. I first had this three years ago and replaced the AC/Heat control unit in the dash. Then it happened again last week and it showed the Check Engine message. I cleared the codes which cleared the Check Engine message and then disconnected the battery for 5 minutes and when I reconnected, the actuators reset themselves and I now have cold AC coming out of all vents.
