RM36D0EC _51 Engine / Hybrid System _087036 M20C-FKS ENGINE CONTROL _0418131 SFI SYSTEM C

M20C-FKS ENGINE CONTROL SFI SYSTEM 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 remains 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 stores the 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 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).	· Short in stop light switch assembly circuit · Stop light switch assembly · ECM	Comes on	DTC stored	SAE: P0724

MONITOR DESCRIPTION

This DTC indicates that the stop light switch assembly remains 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 stores the 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

HINT:: ·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR202304,202405,_51,_087036,_0418131,RM1000000029CMW,202405,999999,_51,_087036,_0418131,RM100000002IFF9,

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR202304,202405,_51,_087036,_0418131,RM1000000029CMW,202405,999999,_51,_087036,_0418131,RM100000002IFF9,

1.302,1.24 2.135,1.615 0.833,0.375 10 false 30 km/h 1.354,1.75 2.052,2.031 0.698,0.281 10 false 3 km/h 1.479,2.042 1.99,2.323 0.51,0.281 10 false Idling 0.677,2.396 2.083,2.719 1.406,0.323 10 false Ignition Switch ON 2.5,2.531 2.927,2.781 0.427,0.25 10 false [A] 3.271,3.5 3.625,3.729 0.354,0.229 10 false [B] 3.406,1.896 3.708,2.25 0.302,0.354 10 false [C] 4.042,1.49 4.344,1.854 0.302,0.365 10 false [D] 6.719,3.469 7.073,3.781 0.354,0.313 10 false [E] 2.542,3.052 3.333,3.354 0.792,0.302 10 false 5 seconds 0.979,0.271 2.115,0.646 1.135,0.375 10 false Vehicle Speed

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

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.

Turn the GTS on.

Wait 5 seconds [A].

Enter the following menus: Powertrain / Engine / Trouble Codes [B].

10.

Read the pending DTCs.

HINT:: ·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.

11.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

12.

Input the DTC: P070312.

13.

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

HINT:: ·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE, perform steps [C] through [E].

·

[A] to [B]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

14.

Start the engine [C].

15.

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.

16.

Enter the following menus: Powertrain / Engine / Trouble Codes [E].

17.

Read the pending DTCs.

HINT:: ·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTCs are not output, perform the following procedure.

18.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

19.

Input the DTC: P070312.

20.

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

HINT:: ·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

[A] to [E]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P05042B.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>P05042B202304,202405,_51,_087036,_0418131,RM1000000029CUE,P05042B202405,999999,_51,_087036,_0418131,RM100000002IF5U,P05042B

CAUTION / NOTICE / HINT

NOTICE:: Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:: ·

Using the GTS, the Data List item "Stop Light SW" can be read.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DATA LIST / ACTIVE TEST202304,202405,_51,_087036,_0418131,RM1000000029CMZ,202405,999999,_51,_087036,_0418131,RM100000002IF5C,

·

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

1.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 / Stop Light SW.

Powertrain > Engine > Data List

Tester Display
Stop Light SW

50003 372 12

Read the Data List displayed on the GTS.

OK:

GTS Display	Measurement Item/Range (Display)	Normal Condition
Stop Light SW	Stop light switch assembly status: ON or OFF	· ON: Brake pedal depressed · OFF: Brake pedal released

Result:

Proceed to
OK
NG

CHECK FOR INTERMITTENT PROBLEMS

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2.CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

Check the stop light switch installation.

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>INSTALLATION201910,999999,_59,_083096,_0402643,RM100000001JJXG,

OK:: Stop light switch is installed correctly.

Result:

Proceed to
OK
NG

3.CHECK TERMINAL VOLTAGE (STP VOLTAGE)

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>INSTALLATION201910,999999,_59,_083096,_0402643,RM100000001JJXG,

3.CHECK TERMINAL VOLTAGE (STP VOLTAGE)

3.479,1.198 3.896,1.49 0.417,0.292 5.771,2.469 5.302,1.198 true 0.823,2.052 1.135,2.25 0.313,0.198 10 false *a 2.458,2.042 2.771,2.24 0.313,0.198 10 false *b 3.469,0.104 3.781,0.302 0.313,0.198 10 false *c 3.531,1.25 3.927,1.51 0.396,0.26 10 false A125 5.677,2.49 6.135,2.688 0.458,0.198 10 false STP

*a	Brake pedal depressed	*b	Brake pedal released
*c	Front view of wire harness connector (to ECM)	-	-

Disconnect the ECM connector.

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

Standard Voltage:

Tester Connection	Brake Pedal Operation	Specified Condition
A125-34 (STP) - Body ground	Released	Below 1.5 V
A125-34 (STP) - Body ground	Depressed	7.5 to 14 V

HINT:: If there is a short in the STP terminal circuit, there may be a malfunction in the circuit of a connected ECU.

Result:

Proceed to
OK
NG

REPLACE ECM

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

Disconnect the stop light switch assembly connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A40-3 (L) or A125-34 (STP) - Other terminals	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>REMOVAL201910,999999,_59,_083096,_0402643,RM100000001JJXI,

REPAIR OR REPLACE HARNESS OR CONNECTOR