СИСТЕМА КРУИЗ-КОНТРОЛЯ (кроме моделей с 1ND-TV, 8NR-FTS), Diagnostic DTC:P0571

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels cruise control system control of vehicle speed. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM cancels control of vehicle speed by the cruise control system.

WIRING DIAGRAM

for TMMT Made

*a	from IGN Fuse
*b	from STOP Fuse
*c	Stop Light Switch Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)

   
   
   1. 

      *a	Front view of wire harness connector (to Stop Light Switch Assembly)

      for TMMT Made:

      
      

      1. Disconnect the A176 stop light switch assembly connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Condition Specified Condition A176-7 (B) - A176-2 (GND) Always 11 to 14 V A176-6 (B) - A176-2 (GND) Ignition switch ON 11 to 14 V

   2. 

      *a	Front view of wire harness connector (to Stop Light Switch Assembly)

      for TMUK Made:

      
      

      1. Disconnect the A1 stop light switch assembly connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Condition Specified Condition A1-2 - Body ground Always 11 to 14 V A1-4 - Body ground Ignition switch ON 11 to 14 V

      Result
      Result Proceed to OK (for TMMT Made) A OK (for TMUK Made) B NG C

   
   

   B

   INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

   C

   REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY OR IG2 RELAY)

   A

2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

   
   

   1. Disconnect the A176 stop light switch assembly connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition A176-2 (GND) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

   OK

3. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)

   
   

   1. Disconnect the ECM connector.

   2. Disconnect the stop light switch assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition A50-9 (STP) - A176-3 (L) Always Below 1 Ω A50-10 (ST1-) - A176-5 (L) Always Below 1 Ω A50-9 (STP) or A176-3 (L) - Body ground Always 10 kΩ or higher A50-10 (ST1-) or A176-5 (L) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)

   OK

4. REPLACE STOP LIGHT SWITCH ASSEMBLY

   
   

   1. Replace the stop light switch assembly.

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

5. CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Clear the DTCs.

      Click here

      
      Powertrain > Cruise Control > Clear DTCs

   5. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.

      
      

      1. Turn the cruise control system on using the cruise control switch (ON-OFF button).

   6. Check for DTCs.

      Click here

      
      Powertrain > Cruise Control > Trouble Codes

      Result
      Result Proceed to DTCs are not output A DTC P0571 is output B

   
   

   A

   END (STOP LIGHT SWITCH ASSEMBLY WAS DEFECTIVE)

   B

   REPLACE ECM for 1NR-FE: Click here REPLACE ECM for 1ZR-FAE: Click here REPLACE ECM for 1ZR-FE: Click here REPLACE ECM for 2ZR-FE: Click here

6. INSPECT STOP LIGHT SWITCH ASSEMBLY

   
   

   1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

   OK

7. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)

   
   

   1. Disconnect the A50 ECM connector.

   2. Disconnect the A1 stop light switch assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      for 1NR-FE, 1ZR-FAE, 1ZR-FE, 2ZR-FE Tester Connection Condition Specified Condition A50-9 (STP) - A1-1 Always Below 1 Ω A50-10 (ST1-) - A1-3 Always Below 1 Ω
      for 1WW Tester Connection Condition Specified Condition A50-48 (STP) - A1-1 Always Below 1 Ω A50-10 (ST1-) - A1-3 Always Below 1 Ω

      Standard Resistance (Check for Short)
      for 1NR-FE, 1ZR-FAE, 1ZR-FE, 2ZR-FE Tester Connection Condition Specified Condition A50-9 (STP) or A1-1 - Body ground Always 10 kΩ or higher A50-10 (ST1-) or A1-3 - Body ground Always 10 kΩ or higher
      for 1WW Tester Connection Condition Specified Condition A50-48 (STP) or A1-1 - Body ground Always 10 kΩ or higher A50-10 (ST1-) or A1-3 - Body ground Always 10 kΩ or higher

   4. Reconnect the stop light switch assembly connector.

   5. Reconnect the ECM connector.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE ECM for 1NR-FE: Click here REPLACE ECM for 1ZR-FAE: Click here REPLACE ECM for 1ZR-FE: Click here REPLACE ECM for 2ZR-FE: Click here REPLACE ECM for 1WW: Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)