Lexus ES300 (1997 year). Manual — part 431
N16045
3
4
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–501
653
1997 LEXUS ES300 (RM511U)
3
Check control switch.
PREPARATION:
(a)
Remove steering wheel center pad.
(b)
Disconnect the control switch connector.
CHECK:
Measure resistance between terminals 3 and 4 of control switch
connector when control switch is operated.
Switch position
Resistance (
Ω
)
Neutral
∞
(No continuity)
RES/ACC
50 – 80
SET/COAST
180 – 220
CANCEL
400 – 440
NG
Replace control switch.
OK
4
Check harness and connector between cruise control ECU and cruise control switch,
cruise control switch and body ground (See page
).
NG
Repair or replace harness or connector.
OK
5
Input signal check (See step 1).
OK
Wait and see.
NG
Check and replace cruise control ECU
(See page
).
N21220
Cruise Control ECU
IDL
13
L–R
ECM
IDLO
E7
11
C14
DI–502
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
654
1997 LEXUS ES300 (RM511U)
DTC
51
Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch in turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor value to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-
gine, so also inspect the engine.
DTC No.
Detection Item
Trouble Area
51
Short in idle signal circuit.
Harness or connector between ECM and throttle position
sensor
Throttle position sensor
Harness or connector between cruise control ECU and ECM
Cruise control ECU
WIRING DIAGRAM
DI0EW–01
AB0119
N19913
I00740
ON
IDL
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–503
655
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal IDL of cruise control ECU connector and body
ground.
PREPARATION:
(a)
Remove the ECU with connector still connected.
(b)
Disconnect the ECM connector.
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL of ECU connector and
body ground when the throttle valve is fully closed and fully
opened.
OK:
Throttle valve position
Voltage
Fully opened
10 – 14 V
Fully closed
Below 2 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
2
Check harness and connector between ECM and throttle position sensor
(See page
).
NG
Repair or replace harness or connector.
OK
3
Check throttle position sensor circuit (See page
NG
Replace throttle position sensor.
OK
N22085
1
2
3
DI–504
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
656
1997 LEXUS ES300 (RM511U)
4
Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure resistance between terminals 1, 3 and 2 of throttle
position sensor connector.
OK:
Terminals
Throttle valve position
Resistance
1 – 2
–
2.5
∼
5.9 k
Ω
2 – 3
Fully opened
0.2
∼
6.3 k
Ω
2 – 3
Fully closed
2.0
∼
10.2 k
Ω
NG
Replace throttle position sensor.
OK
5
Check for open and short in harness and connector between cruise control ECU
and ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
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