Firewall relay info (2G N/A)
#1
04-29-2007, 09:07 PM
Join Date: Nov 2006
Location: Colorado Springs, CO.
Posts: 3,430
Firewall relay info (2G N/A)
ORIGINAL: silvercoupe97
*edited*
Those 30 amp relays can be had at Radio Shack. The factory replacements can be upwards of ~$90. So, I would recommend going to Radio Shack. I would also get a Haynes or Chiltons manual if you don't already have one.
*edited*
yes the 30 amp bosch style relays will work just fine to replace any of the relays (ASD, fuel pump, transmission etc)
The relays are located on the firewall near the brake master cylinder, on the driver's side. There are 2-4 relays there depending on the year and options of your car.
The relays are located on the firewall near the brake master cylinder, on the driver's side. There are 2-4 relays there depending on the year and options of your car.
Now you may not have the transmission relay (only on auto's) and you may have another one to the right of the transmission relay
however the fuel pump relay is always on the left and the ASD is always beside it
hope that helps
however the fuel pump relay is always on the left and the ASD is always beside it
hope that helps
Tech Tips
By Dave Sill
Some Tips for Diagnosing Chrysler's EATX System
“Electronically controlled transaxle systems are capable of learning the customer's driving habits. A customer with a heavy foot will cause the TCM to learn to shift late and hard. On the other side, the TCM will learn to shift early and soft for someone with a light foot.”
In 1989, Chrysler decided to throw a little fun into their transmissions by the fully electronic controlled transaxle. This system is still used today on most of Chrysler's front-wheel drive vehicles. The electronically controlled transaxle (EATX) system consists of a transaxle control module, a solenoid pack, several sensors and switches and finally, the serial bus.
The transaxle control module (TCM) is programmed to monitor more than sensors. It gathers information from the bus and combines it with TCM sensors and switches for shift points and diagnosis.
Electronically controlled transaxle systems are capable of learning the customer's driving habits. A customer with a heavy foot will cause the TCM to learn to shift late and hard. On the other side, the TCM will learn to shift early and soft for someone with a light foot.
The EATX system also watches for a request for vehicle speed control and when it sees a request, it adds "grade hunting." This alters the shifting patterns to help prevent excessive shifting and variations in vehicle speed on those hilly roads.
When diagnosing a Chrysler electronically controlled transaxle, make sure any recent fluid flushes or changes were filled with the correct fluid type. ATF+4 is compatible with all transaxles except on 1999 and earlier minivans, which can have TCC chatter. So continue to use ATF+3 on them (per Service Bulletin No. 21-006-01). Check for codes or lack of codes in the transmission, body controller and powertrain. It's also a good idea to record the clutch volume index (CVI) even if you feel there is not an internal problem. When you erase the TCM's codes, you also erase the CVIs stored in the TCM. If the situation arises where you need to look at CVIs, remember that if you erase them, they will not be there.
Clutch volume index is the transaxle controller's way of monitoring the efficiency of the clutch packs. Every time the vehicle is driven, the TCM measures how long it takes each clutch pack to completely fill up and stop slipping. Worn friction material or leaking clutch pack seals increase the time it takes for a clutch pack to fill and be able to grab. In this situation, CVIs will appear on the scanner with high numbers for one or more of the clutches. Numbers that are too low might indicate insufficient clearance inside the clutch pack, which would cause it to grab too quickly or possibly never fully release.
Next, check the park/neutral information. On vehicles equipped with a transaxle range sensor, make sure they are reading correctly all the time. If you have an intermittent limp-in operation with a pressure switch fault, it could be caused by incorrect input to the TCM. The controller is constantly monitoring this input and if it thinks the gear selector has been moved to another gear, it expects to see a change in one or more of the pressure switches. If it doesn't, a code will be stored and you might end up in limp-in. When the transaxle is placed in limp-in on these vehicles, you will only be able to get two gears: second and reverse.
As I mentioned, fluid quality is very important in these transaxles. In many instances, I've seen a number of problems caused by a fluid change with incorrect fluid. And most often, it causes torque convertor clutch problems.
If you get a vehicle in with a complaint of surging or bucking while at a steady speed above 40 mph but no problems when accelerating or decelerating, test drive to determine if it is related to the torque convertor. If it is, ask the customer if they have recently had the transmission serviced or flushed.
On the older EATX systems, the TCM doesn't have great on-board diagnostics. The problem is that the controller doesn't set a code, so therefore you won't have any direction to go in your diagnosis. First, do a visual check of the TCM for heat sink fins. If there aren't any, then it's the old style and should be replaced - not just for diagnostic purposes but for shift quality and longevity. Also check the Safety Shutdown relay and its circuits. When the TCM energizes the relay, it expects to see an output from it but if it doesn't it is supposed to set a DTC. The older controllers tend not to set any codes when it is intermittent.
If you've covered all the basics - fluid, fluid quality, codes and CVIs - then the next step is to start checking electrical circuits. Just give us a call if you need a hand diagnosing any Chrysler system!
Todd Plourde is an IDENTIFIX DaimlerChrysler specialist with 11 years of diagnostic repair experience.
Experience IdentifixThis information is provided by IDENTIFIX®. IDENTIFIX® resources cut diagnostic time and provide repair solutions that increase the shop's bottom line. From Repair-Trac pattern failure quick fixes, to Diagram-Online wiring diagrams by fax, to the Repair Hotline staffed by 32 master techs who specialize in diagnosing complex problems by phone or fax, IDENTIFIX® helps techicians fix more cars in less time.
For more information on IDENTIFIX, call (800) 894-7221, 8 a.m. - 6 p.m. Central Time.
www.identifix.com.
© 2003 IDENTIFIX. All Rights Reserved.
Rate This Article:
Comments?
ASA Main Page || AutoInc. Main Page || ASA Testifies Before SBA Regulatory Fairness Board || Today's Trends in Technical Training || VINs: How They Affect Your Shop || The Importance of a Customer Mailing List || ASA Debuts 'Members Only' Portal || Guest Editorial || Tech to Tech || Tech Tips || News Briefs || Taking the Hill || Around ASA || Net Worth || Stat Corner || Shop Profile || Members' Advantage || Chairman's Message
AutoInc. Magazine ® Vol. LI, April 2003 E-mail: info@autoinc.org, Web Site: http://www.autoinc.org
Copyright © 2003 Automotive Service Association (ASA). All rights reserved.
By Dave Sill
Some Tips for Diagnosing Chrysler's EATX System
“Electronically controlled transaxle systems are capable of learning the customer's driving habits. A customer with a heavy foot will cause the TCM to learn to shift late and hard. On the other side, the TCM will learn to shift early and soft for someone with a light foot.”
In 1989, Chrysler decided to throw a little fun into their transmissions by the fully electronic controlled transaxle. This system is still used today on most of Chrysler's front-wheel drive vehicles. The electronically controlled transaxle (EATX) system consists of a transaxle control module, a solenoid pack, several sensors and switches and finally, the serial bus.
The transaxle control module (TCM) is programmed to monitor more than sensors. It gathers information from the bus and combines it with TCM sensors and switches for shift points and diagnosis.
Electronically controlled transaxle systems are capable of learning the customer's driving habits. A customer with a heavy foot will cause the TCM to learn to shift late and hard. On the other side, the TCM will learn to shift early and soft for someone with a light foot.
The EATX system also watches for a request for vehicle speed control and when it sees a request, it adds "grade hunting." This alters the shifting patterns to help prevent excessive shifting and variations in vehicle speed on those hilly roads.
When diagnosing a Chrysler electronically controlled transaxle, make sure any recent fluid flushes or changes were filled with the correct fluid type. ATF+4 is compatible with all transaxles except on 1999 and earlier minivans, which can have TCC chatter. So continue to use ATF+3 on them (per Service Bulletin No. 21-006-01). Check for codes or lack of codes in the transmission, body controller and powertrain. It's also a good idea to record the clutch volume index (CVI) even if you feel there is not an internal problem. When you erase the TCM's codes, you also erase the CVIs stored in the TCM. If the situation arises where you need to look at CVIs, remember that if you erase them, they will not be there.
Clutch volume index is the transaxle controller's way of monitoring the efficiency of the clutch packs. Every time the vehicle is driven, the TCM measures how long it takes each clutch pack to completely fill up and stop slipping. Worn friction material or leaking clutch pack seals increase the time it takes for a clutch pack to fill and be able to grab. In this situation, CVIs will appear on the scanner with high numbers for one or more of the clutches. Numbers that are too low might indicate insufficient clearance inside the clutch pack, which would cause it to grab too quickly or possibly never fully release.
Next, check the park/neutral information. On vehicles equipped with a transaxle range sensor, make sure they are reading correctly all the time. If you have an intermittent limp-in operation with a pressure switch fault, it could be caused by incorrect input to the TCM. The controller is constantly monitoring this input and if it thinks the gear selector has been moved to another gear, it expects to see a change in one or more of the pressure switches. If it doesn't, a code will be stored and you might end up in limp-in. When the transaxle is placed in limp-in on these vehicles, you will only be able to get two gears: second and reverse.
As I mentioned, fluid quality is very important in these transaxles. In many instances, I've seen a number of problems caused by a fluid change with incorrect fluid. And most often, it causes torque convertor clutch problems.
If you get a vehicle in with a complaint of surging or bucking while at a steady speed above 40 mph but no problems when accelerating or decelerating, test drive to determine if it is related to the torque convertor. If it is, ask the customer if they have recently had the transmission serviced or flushed.
On the older EATX systems, the TCM doesn't have great on-board diagnostics. The problem is that the controller doesn't set a code, so therefore you won't have any direction to go in your diagnosis. First, do a visual check of the TCM for heat sink fins. If there aren't any, then it's the old style and should be replaced - not just for diagnostic purposes but for shift quality and longevity. Also check the Safety Shutdown relay and its circuits. When the TCM energizes the relay, it expects to see an output from it but if it doesn't it is supposed to set a DTC. The older controllers tend not to set any codes when it is intermittent.
If you've covered all the basics - fluid, fluid quality, codes and CVIs - then the next step is to start checking electrical circuits. Just give us a call if you need a hand diagnosing any Chrysler system!
Todd Plourde is an IDENTIFIX DaimlerChrysler specialist with 11 years of diagnostic repair experience.
Experience IdentifixThis information is provided by IDENTIFIX®. IDENTIFIX® resources cut diagnostic time and provide repair solutions that increase the shop's bottom line. From Repair-Trac pattern failure quick fixes, to Diagram-Online wiring diagrams by fax, to the Repair Hotline staffed by 32 master techs who specialize in diagnosing complex problems by phone or fax, IDENTIFIX® helps techicians fix more cars in less time.
For more information on IDENTIFIX, call (800) 894-7221, 8 a.m. - 6 p.m. Central Time.
www.identifix.com.
© 2003 IDENTIFIX. All Rights Reserved.
Rate This Article:
Comments?
ASA Main Page || AutoInc. Main Page || ASA Testifies Before SBA Regulatory Fairness Board || Today's Trends in Technical Training || VINs: How They Affect Your Shop || The Importance of a Customer Mailing List || ASA Debuts 'Members Only' Portal || Guest Editorial || Tech to Tech || Tech Tips || News Briefs || Taking the Hill || Around ASA || Net Worth || Stat Corner || Shop Profile || Members' Advantage || Chairman's Message
AutoInc. Magazine ® Vol. LI, April 2003 E-mail: info@autoinc.org, Web Site: http://www.autoinc.org
Copyright © 2003 Automotive Service Association (ASA). All rights reserved.
[quote]Automatic Shut Down (ASD) Relay
Description
The logic module uses this relay to control power going to the fuel pump, ignition coil, fuel injectors, and portions of the power module. For 1985 - 1987 models, the relay was internal to the power module. The 1984 power module, the SMEC, and the SBEC use an external relay. The ASD relay will be activated when the logic module detects a signal from the ignition reference sensor. If the signal is lost while the engine is running or the turbo boost pressure reaches the overboost cut-off point, the ASD relay is shut off and the engine will shut down.
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