1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 2425 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-33
33 Author: Date:
2004 LAND CRUISER (RM1071U)
5. PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are s

Page 2426 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual V08423 Knock Sensor 1
GRECM
KNK
E1 12
E6
WIRING DIAGRAM
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand th

Page 2427 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual V08425
LOCK
KNK
E6 Connector
(a) Remove the glove compartment (See page SF-68).
(b) Disconnect the E6 connector of ECM.
INSPECTION PROCEDURE
Replace knock sensor. 1 Check continuity between terminal K

Page 2428 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual FI0048
FI0047
FI0046
IN011-07
IN-36- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
36 Author: Date:
2004 LAND CRUISER (RM1071U)
HOW TO USE THE DIAGNOSTIC
CHART AND INSPECTION
PROCEDURE
1

FI0048
FI0047
FI0046
IN011-07
IN-36- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
36 Author: Date:
2004 LAND CRUISER (RM1071U)
HOW TO USE THE DIAGNOSTIC
CHART AND INSPECTION
PROCEDURE
1. CONNECTOR CONNECTION AND TERMINAL IN-
SPECTION
For troubleshooting, diagnostic trouble code charts or
problem symptom table are provided for each circuit with
detailed inspection procedures on the following pages.
When all the component parts, wire harnesses and con-
nectors of each circuit except the ECU are found to be
normal in troubleshooting, then it is determined that the
problem is in the ECU. Accordingly, if diagnosis is per-
formed without the problem symptoms occurring, refer to
Step 8 to replace the ECU. So always confirm that the
problem symptoms are occurring, or proceed with inspec-
tion while using the symptom simulation method.
The instructions ºCheck wire harness and connectorº and
ºCheck and replace ECUº which appear in the inspection
procedure, are common and applicable to all diagnostic
trouble codes. Follow the procedure outlined below
whenever these instructions appear.
OPEN CIRCUIT:
This could be due to a disconnected wire harness, faulty con-
tact in the connector, and a connector terminal pulled out, etc.
HINT:
It is rarely the case that a wire is broken in the middle of
it. Most cases occur at the connector. In particular, care-
fully check the connectors of sensors and actuators
Faulty contact could be due to rusting of the connector
terminals, to foreign materials entering terminals or a de-
formation of connector terminals. Simply disconnecting
and reconnecting the connectors once changes the
condition of the connection and may result in a return to
normal operation. Therefore, in troubleshooting, if no ab-
normality is found in the wire harness and connector
check, but the problem disappears after the check, then
the cause is considered to be in the wire harness or con-
nectors.
SHORT CIRCUIT:
This could be due to a contact between wire harness and the
body ground or to a short circuit occurred inside the switch, etc.
HINT:
When there is a short circuit between the wire harness and body
ground, check thoroughly whether the wire harness is caught
in the body or is clamped properly.

Page 2429 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual FI7187
IN0379
Sensor Side
ECU Side
IN0378
Sensor SideECU Side
IN0380
Sensor SideECU Side
IN0381
Pull Lightly
Looseness of Crimping
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-37
37 Aut

Page 2430 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual Z17004
Fig. 1
OPENECU
2 Sensor
22 21 111A B C
Z17005
Fig. 2
ECU
Sensor
21A
B C
1
1
22
B04722
Fig. 3
ECU
Sensor
21A
B1 C
1
1
221
2 B2
IN-38- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
38 A

Page 2431 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual Z17007
Fig. 4
Sensor
21A
C
1
1
22B5V
5V
5V
0V
Z17008
Fig. 5
2 1A C
1
1
22
BSHORT
Z17009
Fig. 6
21A C
1
1
22
BSensorECU
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-39
39 Author: Date:

Page 2432 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual Z17808
Fig. 7
Sensor
21A B1 C
1
1
221
2 B2
ECU
IN0383
Example
Ground
IN0384
Ground
Ground
ECU Side
W/H Side IN-40
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
40 Author: Date:
2004 LAND

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