SFI SYSTEM, Diagnostic DTC:P070312
| DTC Code | DTC Name |
|---|---|
| P070312 | Brake Switch "B" Circuit Short to Battery |
DESCRIPTION
The stop light switch assembly is part of a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. This DTC indicates that the stop light switch assembly is remaining on. When the stop light switch assembly remains on during "STOP and GO" driving, the ECM interprets this as a fault in the stop light switch assembly. The ECM store this DTC.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
P070312 |
Brake Switch "B" Circuit Short to Battery |
The stop light switch assembly remains on even when the vehicle repeats 5 cycles of STOP (less than 3 km/h [1.86 mph]) and GO (30 km/h [18.65 mph] or more) (2 trip detection logic). |
|
Does not come on |
DTC stored |
SAE Code: P0724 |
MONITOR DESCRIPTION
This DTC indicates that the stop light switch assembly is remaining on. When the stop light switch assembly remains on during "STOP and GO" driving, the ECM interprets this as a fault in the stop light switch assembly, stores this DTC. The vehicle must STOP (less than 3 km/h [1.86 mph]) and GO (30 km/h [18.65 mph] or more) 5 times during 2 driving cycles, in order to detect a malfunction.
MONITOR STRATEGY
Required Sensors/Components (Main) |
Stop light switch assembly |
Required Sensors/Components (Related) |
Speed sensor |
Frequency of Operation |
Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on [A].
Wait 5 seconds.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
Tip:If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P070312.
Check the DTC judgment result.
GTS Display
Description
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [C] through [E].
Start the engine [C].
Accelerate the vehicle to 30 km/h (18.65 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.86 mph) or less [D]. Repeat step [D] 5 times.
CAUTION:When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
Tip:If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P070312.
Check the DTC judgment result.
GTS Display
Description
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.
WIRING DIAGRAM
Refer to DTC P05042B.
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
Using the GTS, the Data List item "Stop Light SW" can be read.
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
READ VALUE USING GTS (STOP LIGHT SW)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Stop Light SW.
Powertrain > Engine > Data List
Tester Display
Stop Light SW
Read the Data List displayed on the GTS.
OK
GTS Display
Measurement Item/Range (display)
Normal Condition
Stop Light SW
Stop light switch status: ON or OFF
ON: Brake pedal depressed
OFF: Brake pedal released
Result
Proceed to
OK
NG
CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
Check the stop light switch installation.
OK
Stop light switch is installed correctly.
Result
Proceed to
OK
NG
INSPECT STOP LIGHT SWITCH ASSEMBLY
Inspect the stop light switch assembly.
Result
Proceed to
OK
NG
CHECK TERMINAL VOLTAGE (STP VOLTAGE)
Disconnect the ECM connector.
*a
Brake pedal depressed
*b
Brake pedal released
*c
Front view of wire harness connector
(to ECM)
-
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Condition
Specified Condition
A173-9 (STP) - Body ground
Brake pedal released
Below 1.5 V
Brake pedal depressed
7.5 to 14 V
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)