check engine light TOYOTA T100 1996 Factory Manual PDF

Downloaded from www.Manualslib.com manuals search engine N06022
DI34V−02
BE4034
Indicator Light
1.5 sec.0.5 sec.
ON
OFF
I22833
DLC1 DI−410
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE−36) for the combination meter
section.
(b) Check the DTC.
HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a diagnostic trouble code.
(c) Using diagnosis check wire, check the output of DTC.
(1) Turn the ignition switch ON.
(2) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843−18020
(3) Read the DTC on the CRUISE MAIN indicator light.

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1
12
No.Operation MethodCRUISE MAIN Indicator LIght
Blinking PatternDiagnosis
1
2
3
4Drive approx. 40 km/h
(25 mph) or over
Drive approx 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
ON
OFFSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
LightON
OFF LightON
OFF
1sec.
0.25 sec. 0.25 sec.Push the speed control switch
SET/COAT on.
Push the speed control switch
RESUME/ACCEL on.
Each cancel switch turned
ON.
 Speed control switch (to
CANCEL)
 Stop light switch
 Park/Neutral position switch
(to N or O Position)
 Clutch start switch
 Parking brake switch
Speed sensor circuit is
normal
Speed sensor circuit is
normalEach cancel switch is
normal
5 DI−414
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
5. INPUT SIGNAL CHECK
HINT:
For check No.1 ∼ No.3
Turn ignition switch ON.
For check No.4
Jack up the vehicle.
Start the engine.
Shift to D position.
(a) Press the control switch to SET/COAST or RES/ACC
position and hold it down or hold it up ”(1)”.
(b) Push the main switch ON ”(2)”.
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.

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− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−415
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−420)Actuator Motor Circuit
Actuator
Wire harness
Cruise control ECU
12
(DI−422)Actuator Magnetic Clutch Circuit
Actuator
Stop light switch
Wire harness
Cruise control ECU
13
(DI−425)Actuator Position Sensor Circuit
Actuator
Wire harness
Cruise control ECU
21
(DI−428)Vehicle Speed Sensor Circuit
Vehicle speed sensor
Wire harness
Cruise control ECU
*23
(DI−428)Actuator Control Cable
Vehicle Speed Sensor circuit
Vehicle speed sensor
Speed control cable function
Wire harness
Cruise control ECU
32
(DI−431)Control Switch Circuit
Cruise control switch
Wire harness
Cruise control ECU
34
(DI−431)Voltage abnormality in control switch circuit
Control switch
Wire harness
Cruise control ECU
41 Cruise Control ECUCruise control ECU
HINT:
When 2 or more codes are indicated, the lowest numbered code will be displayed first.
*When the vehicle speed decreases on uphill roads, the speed can be set again and drive can be continued
(This is not a malfunction.).

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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

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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

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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

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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