TOYOTA LAND CRUISER 1996 J80 Workshop Manual

DI−278
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
5 Is new ECU−B fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN−18 ).
YES
Check harness between ECU −B fuse and
SRS warning light.
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R13680
Airbag Sensor
AssemblyTc7
B−L
IH1B−Y
11
3
Tc E 1
DLC1 BR−B
EC
S6
S7 11
B−Y
Short Connector 2
2
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−279
1996 LAND CRUISER (RM451U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI5QF−03
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AB0117 AB0118 AB0119H00258
LOCKACCON
or
AB0118
R14305 AB0119
H00030
ACCON
or E1Tc
(+)
(−)
DLC1
DI−280
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
If the DTC is not displayed, perform the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
PREPARATION:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO Check SRS warning light system. (See page DI−240 )
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn ignition switch to ACC or ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 − 14 V
OK Go to step 4.
NG
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AB0118
R14304AB0119
H00031
ACCON
or Tc
(+)
(−)
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−281
1996 LAND CRUISER (RM451U)
3 Check voltage between terminals Tc of DLC1 and body ground
CHECK:
Measure voltage between terminals Tc of DLC1 and body
ground.
OK:
Voltage: 10 − 14 V
OK Check harness between terminal E1 of DLC1 and body ground.
NG
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AB0117 AB0118 AB0119
R12658H00032
LOCKACCON
or
Airbag Sensor Assembly
Tc
DI−282
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect airbag sensor assembly connector.
(d) Insert service wire into terminal Tc from back side as shown.
(e) Connect airbag sensor assembly connector with service wire.
(f) Connect negative (−) terminal cable to battery.
(g) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(h) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
OK Check harness between airbag sensor assem- bly and DLC1.
NG
Replace airbag sensor assembly.
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AB0117
R14303H00033
LOCK
Airbag Sensor Assembly
Tc
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−283
1996 LAND CRUISER (RM451U)
If the DTC is displayed without a DTC check procedure, perform the followi\
ng
troubleshooting.
1 Check resistance between terminal Tc of airbag sensor assembly and body
ground.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect airbag sensor assembly connector.
CHECK:
Check resistance between terminal Tc of airbag sensor assem-
bly connector and body ground.
OK:
Resistance: 1 MΩ or Higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.
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DI5O4−02
Customer Problem Analysis
Check and Clear DTC (Precheck)
Vehicle Brought to Workshop
Problem Symptom Confirmation Symptom Simulation
Symptom
does not occur
DTC Check Normal code
DTC Chart Problem Symptom Table
Circuit Inspection Input Signal Check
Parts Inspection
Identification of Problem Repair
Confirmation Test
End Items inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.
1
2
3 4
5
6 7
8 9
10 Step 2, 5, 8, 10: Diagnostic steps permitting the use
of the T OYOTA hand−held tester or
TOYOTA break −out− box.
P.
DI−285
P. DI−286
P. DI−286
P. DI−291
P. IN−18
P. DI−295
P. DI−306 − DI−310
OK NG
Symptom
occurs
Malfunction code
DI−284
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
451
Author: Date:
1996 LAND CRUISER (RM451U)
CRUISE CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
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DI5O5−01
CRUISE CONTROL SYSTEM Check SheetInspector ’s name:
Customer ’s Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading
/ / km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
Mile
Brought in
Auto cancel
occurs Driving condition  City driving  Freeway  Up hill  Down hill
 After cancel occurred, did the driver activate cruise control again?
 Yes  No
 Cancel does not
occur 
With brake ON
 Except D position shift  At 40 km/h (25 mph) or less
 When control SW turns to CANCEL position
 Cruise control
malfunction 
Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut off does not occur
 O/D does not return
 Switch
malfunction 
SET  ACCEL  COAST  RESUME  CANCEL
 Remains ON  Does not light up  Blinking
Symptoms
DTC Check
1st Time2nd Time

Normal Code  Malfunction Code (Code )
 Normal Code  Malfunction Code (Code )

Cruise MAIN
indicator light
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−285
1996 LAND CRUISER (RM451U)
CUSTOMER PROBLEM ANALYSIS CHECK
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DI5O5−01
CRUISE CONTROL SYSTEM Check SheetInspector ’s name:
Customer ’s Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading
/ / km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
Mile
Brought in
Auto cancel
occurs Driving condition  City driving  Freeway  Up hill  Down hill
 After cancel occurred, did the driver activate cruise control again?
 Yes  No
 Cancel does not
occur 
With brake ON
 Except D position shift  At 40 km/h (25 mph) or less
 When control SW turns to CANCEL position
 Cruise control
malfunction 
Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut off does not occur
 O/D does not return
 Switch
malfunction 
SET  ACCEL  COAST  RESUME  CANCEL
 Remains ON  Does not light up  Blinking
Symptoms
DTC Check
1st Time2nd Time

Normal Code  Malfunction Code (Code )
 Normal Code  Malfunction Code (Code )

Cruise MAIN
indicator light
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−285
1996 LAND CRUISER (RM451U)
CUSTOMER PROBLEM ANALYSIS CHECK
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DI5O6-02
N06218CRUISE MAIN Indicator Light
BE4034
Indicator Light1.5 sec. 0.5 sec.
ON
OFF
N06219
TC
E1
DLC1
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI-286
1996 LAND CRUISER (RM451U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comeson 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-34) 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) Output of DTC using diagnosis check wire. (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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