| DTC Code | DTC Name |
|---|---|
| P0571 | Brake Switch "A" Circuit |
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.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0571 | Brake Switch "A" Circuit | When voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more |
|
| *a | from IGN Fuse |
| *b | from STOP Fuse |
| *c | Stop Light Switch Assembly |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
- Click here
INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE)
-
*a Front view of wire harness connector
(to Stop Light Switch Assembly)
Disconnect the stop light switch assembly connector.
-
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 -
Reconnect the stop light switch assembly connector.
Result Proceed to OK NG
- OKClick here
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)
-
- Click here
INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE)
-
*a Front view of wire harness connector
(to Stop Light Switch Assembly)
Disconnect the stop light switch assembly connector.
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Condition Specified Condition A1-4 - Body ground Ignition switch ON 11 to 14 V -
Reconnect the stop light switch assembly connector.
Result Proceed to OK NG
- OKClick here
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - IG2 RELAY)
-
- Click here
INSPECT STOP LIGHT SWITCH ASSEMBLY
-
Inspect the stop light switch assembly.
Result Proceed to OK NG
- OKClick here
- NG
REPLACE STOP LIGHT SWITCH ASSEMBLYClick here
-
- Click here
CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)
-
Disconnect the ECM connector.
-
Disconnect the stop light switch assembly connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) Table 3. for 1NR-FE, 1ZR-FAE Tester Connection Condition Specified Condition A50-9 (STP) - A1-1 Always Below 1 Ω A50-10 (ST1-) - A1-3 Always Below 1 Ω Table 4. for 1AD-FTV Tester Connection Condition Specified Condition A118-35 (STP) - A1-1 Always Below 1 Ω A118-34 (ST1-) - A1-3 Always Below 1 Ω Standard Resistance (Check for Short) Table 5. for 1NR-FE, 1ZR-FAE 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 Table 6. for 1AD-FTV Tester Connection Condition Specified Condition A118-35 (STP) or A1-1 - Body ground Always 10 kΩ or higher A118-34 (ST1-) or A1-3 - Body ground Always 10 kΩ or higher Result Result Proceed to OK (for 1NR-FE) A OK (for 1ZR-FAE) B OK (for 1AD-FTV) C NG D -
Reconnect the stop light switch assembly connector.
-
Reconnect the ECM connector.
- A
REPLACE ECMClick here
- B
REPLACE ECMClick here
- C
REPLACE ECMClick here
- D
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)
-