DTC P1571 Traction Control Torque Request Circuit. Cadillac Seville 1998

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 DTC 🢒 DTC P1571 Traction Control Torque Request Circuit

Engine Controls Components
Cell 20: A/C Relay, A/C Pressure Sensor, CVRSS and EBTCM
OBD II Symbol Description Notice
ESD Notice

Circuit Description

This diagnostic test checks for a traction control system Pulse Width Modulated signal failure to the PCM. The PCM sends 5 volts on the desired torque circuit (CKT 463) to the Electronic Brake and Traction Control Module (EBTCM). The EBTCM then rapidly switches this CKT to ground creating a PWM (frequency) signal to request a specific amount of torque reduction during a Traction Control Maneuver. If this PWM signal is not received by the PCM for 3 seconds, DTC P1571 is set.

Conditions for Running the DTC

•	DTC P1602 not set.

•	Traction control not failed.

•	Engine speed greater than 500 RPM for 20 seconds.

Conditions for Setting the DTC

PWM (frequency) signal not received on desired torque circuit for 3 seconds.

Action Taken When the DTC Sets

•	PCM disables first gear starts.

•	Transaxle shift adapts are maintained at current levels.

•	The Malfunction Indicator Lamp (MIL) will not illuminate.

•	No message will be displayed.

Conditions for Clearing the DTC

•	A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

•	A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

•	Use a scan tool to clear DTCs.

•	Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.

Diagnostic Aids

This DTC may set along with several others if the key is held in the CRANK position while the engine is running. The starter lockout function of the PCM is enabled several seconds after the engine is running and will prevent the starter from engaging while the engine is running. This will cause a partial loss of power to some components and systems.

If no fault is present refer to the ABS/TCS FUNCTIONAL TEST in Section 5 to aid in isolating an intermittent fault.

Step	Action	Value(s)	Yes	No
1	Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Connect the scan tool. Check for ABS/TCS DTCs. Are any ABS/TCS DTCs set?	--	Go to DTCs that are set	Go to Step 3
3	Check for an intermittent terminal connection problem at PCM connector C2 terminal 46 and at EBTCM connector Desired Torque PWM terminal or an intermittent open or shorted Desired Torque PWM circuit. Repair a fault if necessary. Was a repair performed?	--	Go to Powertrain Control Module Diagnosis for Verify Repair	Fault not present. Refer to Diagnostic Aids

Step

Action

Value(s)

Yes

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

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Connect the scan tool.
Check for ABS/TCS DTCs.

Are any ABS/TCS DTCs set?

Go to DTCs that are set

Go to Step 3

Check for an intermittent terminal connection problem at PCM connector C2 terminal 46 and at EBTCM connector Desired Torque PWM terminal or an intermittent open or shorted Desired Torque PWM circuit.
Repair a fault if necessary.

Was a repair performed?

Go to Powertrain Control Module Diagnosis for Verify Repair

Fault not present. Refer to Diagnostic Aids