1996 TOYOTA T100 sensor

Downloaded from www.Manualslib.com manuals search engine I00414
Speed Sensor
ECTOD/TRIP METER
Cruise Control ECU 4 pulse/
1 rotation
of rotor shaft4 pulse/
1 rotation
of rotor shaft
I22673
DI−428
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 21 Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The vehicle speed siggnal is sent to cruise control ECU from the vehicle speed sensor.
The rotor shaft is driven by the gear of the transmission.
For each rotation of the shaft, the vehicle speed sensor sends a 4−pulse signal through the combination
meter to the cruise control ECU (See the following).
This signal is converted inside the combination meter and sent as a 4−pulse signal to the cruise control ECU.
The ECU calculates the vehicle speed from this pulse frequency.
DTC No.Detection ItemTrouble Area
21Speed signal is not input to the cruise control ECU while
cruise control is set.Vehicle speed sensor
Wire harness
Cruise control ECU
WIRING DIAGRAM
DI353−02

Downloaded from www.Manualslib.com manuals search engine Input SignalIndicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higherLightON
OFF
LightON
OFF
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−429
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Input signal check.
CHECK:
(a) See input signal check on page DI−410.
(b) Check indicator light operation when driving at vehicle
speed above 40 km/h (25 mph), and at vehicle speed be-
low 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−26).
NG
2 Check speedometer circuit (See Combination meter troubleshooting on page
BE−36).
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−16).
NG Repair or replace harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine DI−430
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
4 Check vehicle speed sensor (See page BE−38).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN−26).

Downloaded from www.Manualslib.com manuals search engine I22676
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−437
1996 TOYOTA T100 (RM449U)
Idle Switch 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.
WIRING DIAGRAM
DI356−02

Downloaded from www.Manualslib.com manuals search engine I22837
DI−438
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
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 and ABS ECU connectors.
(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 positionVoltage
Fully opened10 − 16 V
Fully closedBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG
2 Check harness and connector between ECM and throttle position sensor (See
page IN−16).
NG Repair or replace harness or connector.
OK
3 Check throttle position sensor circuit.
(3RZ−FE: See page MF−25)
(5VZ−FE: See page SF−31)
NG Replace throttle position sensor.
OK

Downloaded from www.Manualslib.com manuals search engine I22686
Throttle Position Sensor
1
2
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−439
1996 TOYOTA T100 (RM449U)
4 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of throttle posi-
tion sensor connector when the throttle valve is fully closed and
fully opened.
OK:
Throttle valve positionResistance
Fully opened1 MΩ or higher
Fully closedBelow 500 Ω
NG Replace throttle position sensor.
OK
5 Check for open and short in harness and connector between cruise control ECU
and throttle position sensor, throttle position sensor and body ground (See page
IN−16).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−26).

Downloaded from www.Manualslib.com manuals search engine I22678
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−449
1996 TOYOTA T100 (RM449U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc. when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI35A−02

Downloaded from www.Manualslib.com manuals search engine EM−2
− ENGINE MECHANICAL (3RZ−FE)CO/HC
717 Author: Date:
1996 TOYOTA T100 (RM449U)
6. TROUBLESHOOTING
If the CO/HC concentration does not comply with regulations,
troubleshoot according to the table below.
(a) Check heated oxygen sensor operation.
(b) Check and correct the cause if necessary.
COHCSymptomCauses
NormalHighRough Idle
1. Faulty ignitions:
 Incorrect timing
 Fouled, shorted or improperly gapped plugs
 Open or crossed high−tension cords
 Cracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valves
4. Leaky exhaust valves
5. Leaky cylinder
LowHighRough Idle
(Fluctuating HC reading)
1. Vacuum leaks:
 Vacuum hose
 Intake manifold
 Intake chamber
 PCV line
 Throttle body
HighHighRough Idle
(Black smoke from exhaust)
1. Clogged air filter
2. Plugged PCV valve
3. Faulty SFI systems:
 Faulty fuel pressure regulator
 Clogged fuel return line
 Faulty MAF meter
 Defective ECT sensor
 Defective IAT sensor
 Faulty engine control module (ECM)
 Faulty injector