RM36D0EC _51 Engine / Hybrid System _083058 M20D-FKS ENGINE CONTROL _0401834 SFI SYSTEM C

M20D-FKS ENGINE CONTROL  SFI SYSTEM  P05042B  Brake Switch "A"/"B" Signal Cross Coupled  


DESCRIPTION

The stop light switch assembly is 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. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch assembly and stores this DTC.

HINT:

The normal signal conditions are as shown in the table below.

Signal (ECM Terminal) Brake Pedal Released In Transition Brake Pedal Depressed
STP OFF ON ON
ST1- ON ON OFF

·

[OFF] denotes ground potential.

·

[ON] denotes battery potential (+B).


On the GTS, Data List item Stop Light SW is ON when the brake pedal is depressed.


DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P05042B Brake Switch "A"/"B" Signal Cross Coupled Conditions (a) and (b) are met for 0.5 seconds or more (1 trip detection logic):
(a) Ignition switch ON
(b) STP signal OFF when ST1- signal OFF
·

Open or short in stop light switch signal circuit

·

Stop light switch assembly

·

Instrument panel junction block assembly

·

ECM


- DTC stored SAE: P0504

WIRING DIAGRAM

A562510E01
0.552,3.969 1.24,4.292 0.688,0.323 10 false Battery 0.438,0.792 1.573,1.031 1.135,0.24 10 false INP STD NO. 1-3 2.958,1.385 3.115,1.583 0.156,0.198 10 false 1 2.313,0.938 2.469,1.135 0.156,0.198 10 false 5 1.781,2.115 2.135,2.427 0.354,0.313 10 false AM2 2.563,1.771 3.26,2.052 0.698,0.281 10 false IGP 3.104,1.25 4.365,1.469 1.26,0.219 10 false ECU-IGP NO. 3 2.958,0.938 3.115,1.135 0.156,0.198 10 false 3 3.292,0.771 3.76,1.021 0.469,0.25 10 false STOP 3.313,2.438 3.625,2.635 0.313,0.198 10 false *1 3.656,2.823 3.969,3.021 0.313,0.198 10 false *2 1.917,2.927 2.302,3.219 0.385,0.292 10 false A126 1.927,3.104 3.427,3.531 1.5,0.427 10 false Certification ECU (Smart Key ECU Assembly)*1 2.979,2.469 3.292,2.667 0.313,0.198 10 false 24 2.563,2.563 3.021,2.844 0.458,0.281 10 false IGPD 3.135,3.865 3.292,4.063 0.156,0.198 10 false 8 1.958,3.885 2.115,4.083 0.156,0.198 10 false 7 2.146,3.865 2.604,4.063 0.458,0.198 10 false AM1 2.813,3.865 3.219,4.104 0.406,0.24 10 false IG1 1.771,4.406 3.688,4.656 1.917,0.25 10 false Ignition Switch Assembly*2 1.74,4.24 2.198,4.438 0.458,0.198 10 false G28 4.031,3.813 6.438,4.063 2.406,0.25 10 false *1: w/ Smart Entry and Start System 4.021,4.156 6.49,4.344 2.469,0.188 10 false *2: w/o Smart Entry and Start System 4.313,1.823 4.771,2.021 0.458,0.198 10 false A40 4.302,1.99 5.406,2.448 1.104,0.458 10 false Stop Light Switch Assembly 4.458,1.406 4.917,1.604 0.458,0.198 10 false GND 4.25,1.292 4.406,1.49 0.156,0.198 10 false 2 4.458,1.063 4.688,1.365 0.229,0.302 10 false B 4.25,0.948 4.458,1.24 0.208,0.292 10 false 6 4.469,0.625 4.75,0.99 0.281,0.365 10 false B 4.24,0.5 4.396,0.698 0.156,0.198 10 false 7 5.125,0.615 5.281,0.813 0.156,0.198 10 false L 5.354,0.49 5.583,0.813 0.229,0.323 10 false 3 5.125,1.417 5.281,1.615 0.156,0.198 10 false L 5.344,1.302 5.604,1.563 0.26,0.26 10 false 5 5.969,0.521 6.396,0.781 0.427,0.26 10 false STP 5.677,0.51 5.99,0.708 0.313,0.198 10 false 34 5.948,1.302 6.396,1.719 0.448,0.417 10 false ST1- 5.677,1.302 5.99,1.5 0.313,0.198 10 false 17 6.167,2.302 6.594,2.604 0.427,0.302 10 false A116 6.156,2.479 6.615,2.677 0.458,0.198 10 false ECM 0.927,1.229 1.625,1.51 0.698,0.281 10 false IGP 2.333,1.375 2.49,1.573 0.156,0.198 10 false 2

CAUTION / NOTICE / HINT

NOTICE:

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


HINT:
·

Stop light switch assembly conditions can be checked using the GTS.

(a)

Connect the GTS to the DLC3.

(b)

Turn the ignition switch to ON.

(c)

Turn the GTS on.

(d)

Enter the following menus: Powertrain / Engine / Data List / Stop Light SW.

(e)

Check the Data List indication when the brake pedal is depressed and released.

Brake Pedal Operation Stop Light SW
Depressed ON
Released OFF


·

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.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
A418954C25
0.302,0.938 0.719,1.167 0.417,0.229 2.635,1.708 2.219,1.323 false 0.167,0.177 0.479,0.375 0.313,0.198 10 false *a 2.677,1.677 2.833,1.875 0.156,0.198 10 false B 0.385,0.969 0.844,1.167 0.458,0.198 10 false A40
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

Disconnect the stop light switch assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A40-7 (B) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

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

2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
A418954C26
0.344,0.938 0.76,1.188 0.417,0.25 2.344,1.833 2.063,1.344 false 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a 0.438,0.969 0.896,1.167 0.458,0.198 10 false A40 2.344,1.854 2.802,2.052 0.458,0.198 10 false B
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

Disconnect the stop light switch assembly connector.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A40-6 (B) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

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

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

Disconnect the stop light switch assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A40-2 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.CHECK TERMINAL VOLTAGE (STP AND ST1- VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK TERMINAL VOLTAGE (STP AND ST1- VOLTAGE)
A534800C01
3.542,1.24 3.958,1.531 0.417,0.292 5.865,2.375 5.302,1.208 true 4.406,2.406 5.104,1.135 true 0.792,2.094 1.104,2.292 0.313,0.198 10 false *a 2.521,2.146 2.833,2.344 0.313,0.198 10 false *b 3.542,0.094 3.854,0.292 0.313,0.198 10 false *c 3.594,1.313 3.99,1.573 0.396,0.26 10 false A116 4.229,2.448 4.844,2.646 0.615,0.198 10 false ST1- 5.813,2.438 6.271,2.635 0.458,0.198 10 false STP
*a Brake Pedal Depressed *b Brake Pedal Released
*c Front view of wire harness connector
(to ECM) 		- -


a.

Disconnect the ECM connector.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Brake Pedal Operation Specified Condition
A116-17 (ST1-) - Body ground Released 7.5 to 14 V
Depressed Below 1.5 V
A116-34 (STP) - Body ground Released Below 1.5 V
Depressed 7.5 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

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

Disconnect the stop light switch assembly connector.


b.

Disconnect the ECM connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A40-5 (L) - A116-17 (ST1-) Always Below 1 Ω
A40-3 (L) - A116-34 (STP) Always Below 1 Ω
A40-5 (L) or A116-17 (ST1-) - Body ground and other terminals Always 10 kΩ or higher
A40-3 (L) or A116-34 (STP) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR