P1571 ASR Desired Torque
what is this code its coming up with no comm tcs???
|
DTC P1571 Traction Control Torque Request Circuit
Circuit Description The PCM supplies 5 volts on the desired torque circuit to the Electronic Brake and Traction Control Module (EBTCM). The EBTCM toggles this 5 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 tests for a Desired Torque signal failure. If the PCM does not receive the Desired torque signal, this DTC sets. Conditions for Running the DTC • The traction control has not failed. • The engine speed is greater than 500 RPM for 20 seconds. Conditions for Setting the DTC 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: • Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM\TAC modules. • For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616 . Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Wiring Systems. • 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: - Poor connections; Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. - Corrosion - Mis-routed harness - Rubbed through wire insulation - Broken wire inside the insulation • For an intermittent condition, refer to Symptoms . Bill |
Thanks for the reply I had my ebcm out to resolder what i could and put it back in and cleared all the codes after starting the car I got the pcm p1571 and the sdm u1040 codes I've been getting the 1255 code before thats why the soldering.. I have a used ebcm coming I've cleaned all the grounds and checked the fuses so i'm convinced ite the ebcm thats the problem wish me luck
|
Originally Posted by Bill Dearborn
(Post 1578918013)
DTC P1571 Traction Control Torque Request Circuit
Circuit Description The PCM supplies 5 volts on the desired torque circuit to the Electronic Brake and Traction Control Module (EBTCM). The EBTCM toggles this 5 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 tests for a Desired Torque signal failure. If the PCM does not receive the Desired torque signal, this DTC sets. Conditions for Running the DTC • The traction control has not failed. • The engine speed is greater than 500 RPM for 20 seconds. Conditions for Setting the DTC 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: • Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM\TAC modules. • For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616 . Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Wiring Systems. • 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: - Poor connections; Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. - Corrosion - Mis-routed harness - Rubbed through wire insulation - Broken wire inside the insulation • For an intermittent condition, refer to Symptoms . Bill Would a P1571 code, TCS, and ABS lights on the dash on. Effect the transmission shifting 2/3, as a result of bad wheels sensors. I know I need to replace the brakes, and most likely address the wheel sensors, but I also have an issue with the Trans not shifting into 3, (2000 4l60E automatic). After reading your post, I was wondering if the two issues are related. Or if I should focus on rebuilding or swapping the Trans, she has 180K on the clock. No codes present regarding the Trans on the DTC/DIC. |
Originally Posted by JamesPerconte
(Post 1606267765)
Bill,
Would a P1571 code, TCS, and ABS lights on the dash on. Effect the transmission shifting 2/3, as a result of bad wheels sensors. I know I need to replace the brakes, and most likely address the wheel sensors, but I also have an issue with the Trans not shifting into 3, (2000 4l60E automatic). After reading your post, I was wondering if the two issues are related. Or if I should focus on rebuilding or swapping the Trans, she has 180K on the clock. No codes present regarding the Trans on the DTC/DIC. My EBCM was fried after a battery shorted and melted the positive terminal post out clean out of it and my transmission still works the same as it did after replacing that battery. Now I just have the warm glow of extra warning lights on the dash to keep to make up for all the failed lights on the HVAC panel. |
All times are GMT -4. The time now is 01:13 AM. |
© 2024 MH Sub I, LLC dba Internet Brands