Terminal TOYOTA LAND CRUISER 1996 J80 Workshop Manual

I00494
Cruise Control ECUECT
22 9
15
9
E4S2
R−Y
ECM
E7
OD1
ODC17
18
G−R
G−O
C17
R−Y
R−Y
2 EC2 IH2
Ellectronically Con trolled
Transmission Solenoid
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−319
1996 LAND CRUISER (RM451U)
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under cruise control, in order to reduce shifting due to ON− OFF overdrive operation and
to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a si\
gnal
to prevent upshift until the end of the up hill slope is sent from the cru\
ise control ECU to the electronically
controlled transmission.
Terminal ECT of the cruise control ECU detects the shift change signal (\
output to electronically controlled
transmission No. 2 solenoid) from the ECM.
If vehicle speed down, also when terminal ECT of the cruise control ECU receives down shifting signal, it
sends a signal from terminal OD to ECM to cut overdrive until the end of the uph\
ill slope, and the gear shifts
are reduced and gear shift points in the electronically controlled transmis\
sion are changed.
WIRING DIAGRAM
DI5OK−02
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AB0119I00012 I00025
ON
OD
(−) (+)
DI−320
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON ↔ OFF occurs with operation of OD switch ON−OFF.
NG Check and repair electronically controlledtransmission (See page DI−129 ).
OK
2 Check voltage between terminal OD of harness side connector of cruise co\
ntrol ECU and body ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
(c) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:
Voltage: 10 − 14 V
NG Go to step 5.
OK
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I00019
ECT
(−) (+)
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−321
1996 LAND CRUISER (RM451U)
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect the ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:
OD switch positionVoltage
ON8 − 14 V
OFFBelow 0.5 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
4 Check harness and connector between terminal ECT of cruise control ECU a\
nd electronically controlled transmission solenoid (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5 Check harness and connector between terminal OD of cruise control ECU an\
d terminal OD1 of ECM (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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AB0119I00017 I00026
ON
D
(−)
(+)
DI−324
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
3 Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D position and other positions.
OK:
Shift PositionVoltage
D position10 − 14 V
Other positionsBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
4 Check harness and connector between cruise control ECU and park/neutral position switch (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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I00496
Cruise Control ECU
Fusible Link Fusible Link
Battery BR
BR
Instrument
Panel Fuse Block
ECU−IG
Ignition Switch BB
2
4 3
2
F6
1 JUNCTION
CONNECTOR J6
C17
C17B−W
I12
I12 4
2
2
2
2 B−W
F11
F11
B
B−Y
B
6EA2B
GND
13
14
AM1
FL AM1
1
ID
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−325
1996 LAND CRUISER (RM451U)
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
DI5OM−02
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N18670
Junction Block No.1ECU−B
Fuse
AB0119I00014 I00027
GNDB
ON
(−)
(+)
DI−326
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check ECU −B fuse.
PREPARATION:
Remove the ECU −B fuse from instrument panel fuse block.
CHECK:
Check continuity of ECU −B fuse.
OK:
Continuity
NG Check for short in all the harness and compo- nents connected to ECU−B fuse.
OK
2 Check voltage between terminals B and GND of cruise control ECU connecto\
r.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
10 − 14 V
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−295 ).
NG
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I00018
GND
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−327
1996 LAND CRUISER (RM451U)
3 Check resistance between terminal GND of cruise control ECU connector and
body ground (See page IN−28).
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery
(See page IN−28 ).
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I00016
BATT
(−)
(+)
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−329
1996 LAND CRUISER (RM451U)
2 Check voltage between terminal BATT of cruise control ECU connector and body
ground (See page IN−28).
PREPARATION:
Remove the ECU with connector still connected.
CHECK:
Measure voltage between terminal BATT of ECU connector
and body ground.
OK:
Voltage: 10 − 14 V
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−295 ).
NG
Check and repair harness and connector be-
tween battery and cruise control ECU
(See page IN−28 ).
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AB0119I00013 I00028
ONCMS
(−)
(+)
DI−330
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
See page DI−311 .
INSPECTION PROCEDURE
1 Check voltage between terminal CMS 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 CMS of cruise control ECU
connector when main switch is held on and off.
OK:
Main switchVoltage
OFF10 − 14 V
ONBelow 2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
DI5OO−02
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N15969
35
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−331
1996 LAND CRUISER (RM451U)
2 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad (See page SR−11).
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 3 and 5 of control switch
connector when main switch is held on and off.
OK:
Switch positionTester connectionSpecified condition
OFF3 − 5No continuity
Hold ON3 − 5Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and main switch (\
See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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