Lexus RX300 (MCU15). Manual — part 315
I00051
ABS Speed Sensor
ABS ECU
Combination
Meter
Cruise Control ECU
DI–492
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
DTC
21
Open in Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The vehicle speed sensor circuit is sent to cruise control ECU as vehicle speed signal. For each rotation of
the shaft, the vehicle speed sensor sends a signal through the combination meter to the cruise control ECU
(See the following chart). The ECU calculates the vehicle speed from this pulse frequency.
DTC No.
Detection Item
Trouble Area
21
Speed signal is not input to the cruise control ECU while cruise
control is set.
S
Combination meter
S
Harness or connector between cruise control ECU and com-
bination meter, combination meter and vehicle speed sensor
S
Vehicle speed sensor
S
Cruise control ECU
DI08P–25
I19251
Cruise Control ECU
12
V–W
V–W
J/B No. 3
Combination Meter ECU
3K
3E
C16
12
2
SPD
IJ1
8
V–W
R–B
C12
10
C10
20
IE2
7
R–B
A23
16
Skid Control ECU
SP1
Input Signal
Indicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higher
Light ON
OFF
Light
ON
OFF
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–493
LEXUS RX300 (RM785E)
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Input signal check.
CHECK:
(a)
See input signal check on page DI–474.
(b)
Check indicator light operation when driving with vehicle
speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).
OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays on
OK
Check and replace cruise control ECU (See
page IN–32).
NG
DI–494
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
2
Check speedometer circuit (See Combination meter troubleshooting on page
BE–62).
NG
Repair or replace harness, connector or com-
bination meter assembly.
OK
3
Check harness and connector between cruise control ECU and combination me-
ter, combination meter and vehicle speed sensor (See page IN–32).
NG
Repair or replace harness or connector.
OK
4
Check vehicle speed sensor (See page BE–68).
NG
Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN–32).
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–495
LEXUS RX300 (RM785E)
DTC
23
Vehicle Speed Signal Abnormal
CIRCUIT DESCRIPTION
See page DI–492.
DTC No.
Detection Item
Trouble Area
23
Vehicle speed sensor pulse is abnormal.
S
Vehicle speed sensor
S
Cruise control ECU
WIRING DIAGRAM
See page DI–492.
INSPECTION PROCEDURE
1
Check vehicle speed sensor (See page BE–68).
NG
Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN–32).
DI08Q–16
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст