Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ccs cidtc51
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DI-586
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI08S-15
DTC 51 Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch is 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
S Harness or connector between ECM and throttle position
sensor
51 Short in idle signal circuit. S Throttle position sensor
S Harness or connector between cruise control ECU and ECM
S Cruise control ECU
WIRING DIAGRAM
ECM Cruise Control ECU
25 13
L
IDLO E9 C15 IDL
I02746
2001 SIENNA (RM787U)
Author : Date : 740
DI-587
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal IDL of cruise control ECU connector and body
ground.
PREPARATION:
ON
(a) Remove the ECU with connector still connected.
(b) Disconnect the ECM connector.
(c) Turn ignition switch ON.
IDL 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
AB0119
I00167
I00172
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-572 ).
NG
2 Check harness and connector between ECM and throttle position sensor (See
page IN-31 ).
NG Repair or replace harness or connector.
OK
3 Check throttle position sensor circuit (See page DI-41 ).
NG Replace throttle position sensor.
OK
2001 SIENNA (RM787U)
Author : Date : 741
DI-588
DIAGNOSTICS - CRUISE CONTROL SYSTEM
4 Check throttle position sensor.
PREPARATION:
Throttle Position Sensor Disconnect the throttle position sensor connector.
CHECK:
Measure resistance between terminals 3 and 4 of throttle posi-
3
tion sensor connector when the throttle valve is fully closed and
fully opened.
4 OK:
Throttle valve position Resistance
I00052
Fully opened 1 M or higher
Fully closed Below 2.3 k
NG Replace throttle position sensor.
OK
5 Check for open and short in harness and connector between cruise control ECU
and ECM (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 742
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