light TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine I22681
DI−422
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns ON, supplying electrical power to the stop
light. Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No.Detection ItemTrouble Area
12Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in actuator magnetic clutch circuit.
Actuator
Stop light switch
Wire harness
Cruise control ECU
WIRING DIAGRAM
DI351−02

Downloaded from www.Manualslib.com manuals search engine N06038
STOP Fuse
I22835
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−423
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check STOP fuse.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block.
CHECK:
Check fuse continuity.
OK:
Continuity
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch positionContinuity
Switch pin free
(Brake pedal depressed)2 − 4
Switch pin pushed in
(Brake pedal released)1 − 3
NG Replace stop light switch.
OK

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 Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF3 Pulses
ON
OFFSW OFF
SW ON
AB0119
I00136
I00162
ON
CCS
(+) (−)
DI−432
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI−410.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned ON.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.
OK Wait and see.
NG
2 Check voltage between terminal CCS of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal CCS of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL is turned ON.
Switch positionVoltage (V)
Neutral10 − 16
RES/ACC0.8 − 14 V
SET/COAST2.4 − 4.0 V
CANCEL5.1 − 8.3 V
NG Proceed to next circuit inspection shown in
problem symptom table (See page DI−419).
OK

Downloaded from www.Manualslib.com manuals search engine I22687
DI−434
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail−safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP−
When the brake is ON, battery positive voltage is normally applied through the STOP fuse and stop light
switch to terminal STP− of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP− has an open circuit, terminal STP− will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF (See page DI−422 for operation of the magnetic clutch).
WIRING DIAGRAM
DI355−02

Downloaded from www.Manualslib.com manuals search engine Input SignalIndicator Light
Blinking Pattern
Stop Light
switch ON
LightON
OFFSW OFF
SW ON
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−435
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.
NG Check stop light system (See page BE−30).
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI−410.
(b) Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes off when the brake pedal is
depressed.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG

Downloaded from www.Manualslib.com manuals search engine AB0119
I00015I00024
ON
STP−
(−) (+)
DI−436
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check voltage between terminal STP− of cruise control ECU connector and
body ground.
PREPARATION:
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal STP− of cruise control ECU
connector and body ground, when the brake pedal is de-
pressed and released.
OK:
Depressed10 − 16 V
ReleasedBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG
4 Check for open in harness and connectors between terminal STP− of cruise con-
trol ECU and stop light switch (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 Input SignalIndicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to
except D position)LightON
OFFSW ON
SW OFF
DI−444
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting.
(3RZ−FE: See page DI−1)
(5VZ−FE: See page DI−127)
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI−410.
CHECK:
Check the indicator light when shifting into except D position.
OK:
The indicator light goes off when shifting into except
D position.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG

Downloaded from www.Manualslib.com manuals search engine Input Signal
Indicator Light
Blinking Pattern
Clutch switch
OFF (Depress
clutch pedal)
LightON
OFFSW ON
SW OFF
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−447
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting.
(3RZ−FE: See page DI−1)
(5VZ−FE: See page DI−127)
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI−410.
CHECK:
Check the indicator light when clutch pedal is depressed.
OK:
The indicator light goes off when depressing the
clutch pedal .
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG

Downloaded from www.Manualslib.com manuals search engine A01399
Dot Mark
P15017A03714
P15018A03715
P15045A03716
P15044
SST (A)
SST (B)
EM−6
− ENGINE MECHANICAL (3RZ−FE)VALVE CLEARANCE
721 Author: Date:
1996 TOYOTA T100 (RM449U)
(b) Check that the timing marks (one and two dots) of the
camshaft drive and driven gears are in straight line on the
cylinder head surface as shown in the illustration. If not,
turn the crankshaft 1 revolution (360°) and align the
marks as above.
9. INSPECT VALVE CLEARANCE
(a) Check only the valves indicated.
Using a thickness gauge, measure the clearance
between the valve lifter and camshaft.
Record the out−of−specification valve clearance
measurements. They will be used later to determine
the required replacement adjusting shim.
Valve clearance (Cold):
Intake
0.15 − 0.25 mm (0.006 − 0.010 in.)
Exhaust
0.25 − 0.35 mm (0.010 − 0.014 in.)
(b) Turn the crankshaft pulley 1 revolution (360°) and align
its groove with timing mark ”0” of the timing chain cover.
(c) Check only the valves indicated as shown. Measure the
valve clearance (See procedure in step (a)).
10. ADJUST VALVE CLEARANCE
(a) Remove the adjusting shim.
Turn the crankshaft to position the cam lobe of the
camshaft on the adjusting valve upward.
Position the notch of the valve lifter toward the spark
plug side.
Using SST (A), press down the valve lifter and place
SST (B) between the camshaft and valve lifter
flange. Remove SST (A).
SST 09248−55040 (09248−05410, 09248−05420)
HINT:
 Apply SST (B) at slight angle on the side marked with ”9”,
at the position shown in the illustration.
 When SST (B) is inserted too deeply, it will get pinched
by the shim. To prevent it from being stuck, insert it shal-
lowly from the outside of the cylinder head, at a slight
angle.