Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 74
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–251
ES
OK
(a) Shift the transmission gear selector lever to the neutral
position.
(b) Jack up the vehicle.
(c) Turn the ignition switch ON.
(d) Check the voltage between the terminals of the B3 and
E46 ECM connectors as the wheel is turned slowly.
Standard
HINT:
The output voltage should fluctuate up and down
similarly to the diagram on the left when the wheel is
turned slowly.
NG
OK
2
INSPECT ECM (SPD VOLTAGE)
ECM Connector
B3
E46
E1 (-)
SPD (+)
12 V
0 V
Turn Wheel
A116298E02
Tester Connections
Specified Conditions
SPD (E46-8) - E1 (B3-1)
Voltage generated intermittently
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM (See page
)
ES–252
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The stop light switch 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 and sets the DTC.
HINT:
The normal conditions are as shown in the table below. The signals can be read using an intelligent tester.
DTC
P0504
Brake Switch "A" / "B" Correlation
Signals
Brake Pedal Released
In Transition
Brake Pedal Depressed
STP
OFF
ON
ON
ST1-
ON
ON
OFF
DTC No.
DTC Detection Conditions
Trouble Areas
P0504
Conditions (a), (b) and (c) continue for 0.5 seconds or more (1
trip detection logic)
(a) Ignition switch ON
(b) Brake pedal released
(c) STP signal OFF when ST1- signal OFF
•
Short in stop light switch signal circuit
•
STOP fuse
•
Stop light switch
•
ECM
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–253
ES
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when
malfunctions are detected. 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.
1
2
High Mounted
Stop Light
Stop
Stop
STOP
ALT
Battery
IGN
IG1
Stop Light Switch
Skid Control ECU
STOP LP CTRL
ECM
ST1-
STP
Rear Combination
Light (RH)
Rear Combination
Light (LH)
1
2
1
3
1
3
T1
L14
L11
15
E47
16
E47
STP0 A4
5
1
3
2
4
3
2
4
1
A3
16
A133421E01
ES–254
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Check whether the stop lights turn on and off normally
when the brake pedal is depressed and released.
OK:
Stop lights turn ON when brake pedal is depressed.
NG
OK
(a) Remove the stop light switch assembly.
(b) Check the resistance.
Standard Resistance
(c) Reinstall the stop light switch assembly.
NG
OK
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / STOP
LIGHT SW.
(d) Check the STP signal when the brake pedal is
depressed and released.
Standard
(e) Measure the voltage between the terminals of the B3
and E47 ECM connectors.
Standard Voltage
OK
1
CHECK OPERATION OF STOP LIGHT
REPAIR OR REPLACE STOP LIGHT SWITCH
CIRCUIT
2
INSPECT STOP LIGHT SWITCH ASSEMBLY
Free
Pushed in
1
2
4
3
A072924E09
Switch Positions
Tester Connections
Specified Conditions
Switch pin free
1 - 2
Below 1
Ω
3 - 4
10 k
Ω or higher
Switch pin pushed in
1 - 2
10 k
Ω or higher
3 - 4
Below 1
Ω
REPLACE STOP LIGHT SWITCH ASSEMBLY
3
READ VALUE USING INTELLIGENT TESTER (STP SIGNAL AND ST1- VOLTAGE)
ECM Connector
E1(-)
ST1-(+)
Brake Pedal
Released
Brake Pedal
Depressed
E47
B3
G035663E04
Brake Pedal Operations
Specified Conditions
Depressed
STP signal ON
Released
STP signal OFF
Tester Connections
Brake Pedal Operations
Specified Conditions
ST1- (E47-16) - E1 (B3-
1)
Depressed
Below 1.5 V
Released
7.5 to 14 V
CHECK FOR INTERMITTENT PROBLEMS
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст