tried to adjust my hand brake yesterday by using the method on here. Back up at 5mph or so and pull the hand brake. Not only did it not adjust my hand brake but my ABS light is now on and code 1571 was current. I reset the code but my ABS light is still on. The traction control system reads NO COMM. Anyone have any insight? So much for an easy fix.....

 

Check the fuses in the under hood fuse box labeled 10A ABSTRNS and 20A ABS/RTD ELEC.

 

I'll do that thiss evening. Thanks a bunch for the reply! I hope that gets it

 

That will not adjust the Handbrake.

 

P1571 ASR Desired Torque

I have no clue what this code means. Maybe forum member Bill Dearborn is the best person for this.

 

Typically code P1571 is a persistent history code on 97s and will not mean anything and cannot be reset. There is a TSB on this code. However, in your situation with the traction control light on there could be some other problem. Playing with the handbrake should not have done anything but you never know. You didn't mention whether the code is shown as a history or current code.

Here is the TSB followed by the diagnostic procedure for the code:
History DTC P1571 Stored and Will Not Clear #PI00219 - (Jul 2, 2002)

History DTC P1571 Stored and Will Not Clear
.
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:

Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.
Recommendation/Instructions:

This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, then follow trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.

DTC P1571 Traction Control Torque Request Circuit

Circuit Description

The PCM supplies 5.0 volts on the Desired Torque circuit to the Electronic Brake and Traction Control Module (EBTCM). The EBTCM toggles this 5.0 volt signal to a ground in order to produce a duty cycle signal. The signal is proportional to the amount of engine output torque reduction requested by the EBTCM. The EBTCM supplies this signal when it detects a wheel slip. In order to reduce engine output torque, the PCM reduces the amount of spark advance and in some cases the PCM disables a number of fuel injectors. This diagnostic test checks for a Desired Torque signal failure. If the PCM does not receive the Desired torque signal this DTC sets.




Conditions for Setting the DTC

• The traction control has not failed.
• The engine speed is greater than 500 RPM for 20 seconds.
• The desired torque signal is not received by the PCM for 3 seconds.

Action Taken When the DTC Sets

• The powertrain control module (PCM) stores the DTC information into memory when the diagnostic runs and fails.
• The malfunction indicator lamp (MIL) will not illuminate.
• The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

Conditions for Clearing the MIL/DTC

• A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
• A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
• Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important

Do not perform this diagnostic procedure if the customer's concern is not related to the ABS and/or the Traction Control system(s).



The following may cause an intermittent:

• Mis-routed harness
• Rubbed through wire insulation
• Broken wire inside the insulation

Test Description

The numbers below refer to the step numbers on the diagnostic table.
Step 2. This step determines if the EBTCM is receiving the 5.0 volts from the PCM. Use the connector test kit adaptor J 35616-A when probing the EBTCM connector.
Step 3. If no DTCs are set, inspect connections at the EBTCM.
Step 11. This DTC will not report a pass. The scan tool status for this DTC will never report a pass. The scan tool will only display when the diagnostic fails. The repair is not complete if the scan tool indicates that the diagnostic ran and failed.

DTC P1571 Desired Torque Circuit

Step








Step 1
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?






Step 2
Important




Perform this diagnostic procedure only if the customer's concern is related to the ABS and/or the Traction Control system(s). Refer to ABS Diagnostic System Check for further diagnosis.

• Install the scan tool.
• Turn OFF the ignition.
• Disconnect the EBTCM electrical connector.
• Turn ON the ignition leaving the engine OFF.
• Probe the Desired Torque circuit at the EBTCM electrical connector using the DMM J 39200 connected to ground.

Does the DMM display near the specified value?






Step 3
Important

Verify communication between the scan tool and the EBTCM before you continue with this diagnostic. Refer to ABS Diagnostic System Check if you can not establish communications.
Are DTCs C1255 or C1277 (ABS/TCS DTCs) or B0844 (BCM DTC) set?






Step 4
Probe the Desired Torque circuit at the EBTCM electrical connector using the DMM J 39200 connected to ground.
Does the DMM display near the specified value?






Step 5
Probe the Desired Torque circuit at the EBTCM electrical connector using a test lamp connected to B+.
Is the test lamp illuminated?









Step 6

• Check for an open in the Desired Torque circuit.
• If you find a problem, repair it as necessary. Refer to Body and Accessories/Wiring Systems.

Did you find and correct the condition?






Step 7
Repair the short to B+ on the Desired Torque circuit. Refer to Body and Accessories/Wiring Systems.
Is the action complete?






Step 8
Repair the short to ground on the Desired Torque circuit. Refer to Body and Accessories/Wiring Systems.
Is the action complete?









Step 9

• Check the terminal connections at the PCM.
• If you find a problem, repair it as necessary. Refer to Body and Accessories/Wiring Systems.

Did you find and correct the condition?






Step 10
Important:

Program the replacement PCM. Refer to PCM/TAC Module Replacement .
Replace the PCM.
Is the action complete?









Step 11

• Select the Diagnostic Trouble Code (DTC) option and the Clear DTC option using the scan tool.
• Idle the engine at the normal operating temperature.
• Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
• Operate vehicle within the conditions for setting this DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test failed?






Step 12
Select the Capture Info option and the Review Info option using the scan tool.
Does the scan tool display any DTCs that you have not diagnosed?

 

Can't believe everything you read...........

 

He should have read all the posts about pulling the rotors and adjusting the star adjusters in the emergengy brakes. That's the CORRECT way to do it.

 

I know. I figured it was worth a try. Even if it didnt work it wouldnt make it worse.... wrong. There are MANY members that have posted positive results using the method.

My traction control light only illuminates when I push it. Traction control still works. Its just the abs light that is on. I cleared every code and disconneccted the battery. Maybe that will reset it. I'll also check the fuses when I get home. I can deal with there being a code. Its just the service light that is driving me crazy.

Thanks for all the replies that offer help....

 

I did read those. I also read the reverse and pull ones. I naturally tried the easiest one first.

If you would like to post please offer assistance. I dont need to be told I did the wrong thing. The reverse and pull method is one I found all over the searches I made in C5 tech so naturally I tried it. Some members swear by it and others say it doesnt work.

 

Just because some members post positive results, doesn't mean it's the right thing to do. The little shoes for the emergency brake are designed to keep the car in place, not stop 3000 lbs in motion(even at 5 mph).

If you need a procedure for something...post up and ask for it. Plenty of us have service manuals....I probably send out 3 procedures/schematics per day...

 

cool, thanks. On another positive note; i reconnected the battery today and the service light and abs light are gone. Hopefully they stay that way!

Thanks for ya'lls help.

Matt

 

Old thread, but it seems to be the best on the topic.

I swapped in a supposedly known good EBCM to replace mine (which had failing relays). Now I get the 1571 and 1277 codes. Is the replacement EBCM a likely culprit or should I look elsewhere?

Thanks.

 

What year car do you have?

Bill

 

2001, EBCM is from a 2002.

 

The two codes together are telling you the PCM is not receiving or not getting a proper torque request from the EBCM. This could be due to a wiring problem between the two or a ground issue at either module. The electronic ground for the EBCM is G108 which is on the passenger side of the car under the battery near G104. The problem could also be due to the EBCM or the PCM. Since you just replaced a bad EBCM that didn't have these codes I would lean toward a connection issue at the EBCM connector, or an EBCM that had several problems when it was shipped to whoever fixed the relay in the EBCM.

Bill

 

Thanks Bill.

Not sure what the connection issue would be, but I'll have a look. I also have another supposedly known-good EBCM on the way, so maybe that will give a different result. The EBCM that I swapped in was supposedly good, never repaired.

In any case, ABS works, which is all I care about as it is going to be a wet Thurs/Fri at NJMP.