Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 273
INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
IN–47
IN
(b) Check the resistance.
(1) Disconnect connectors A and C and measure
the resistance between them.
Standard resistance (Fig. 2)
HINT:
Measure the resistance while lightly shaking the
wire harness vertically and horizontally. If the
results match the examples above, an open
circuit exists between terminal 1 of connector A
and terminal 1 of connector C.
(2) Disconnect connector B and measure the
resistance between the connectors.
Standard resistance (Fig. 3)
If the results match the examples above, an
open circuit exists between terminal 1 of
connector B2 and terminal 1 of connector C.
(c) Check the voltage.
(1) In a circuit in which voltage is applied to the ECU
connector terminal, an open circuit can be
checked by conducting a voltage check.
With each connector still connected, measure
the voltage between the body ground and these
terminals (in this order): 1) terminal 1 of
connector A, 2) terminal 1 of connector B, and 3)
terminal 1 of connector C.
Standard voltage (Fig. 4)
If the results match the examples above, an
open circuit exists in the wire harness between
terminal 1 of connector B and terminal 1 of
connector C.
Fig. 2
ECU
B
SENSOR
A
C
1
2
2
2
1
1
Z017005E02
Tester Connection
Specified Condition
Connector A terminal 1 - Connector
C terminal 1
10 k
Ω or higher
Connector A terminal 2 - Connector
C terminal 2
Below 1
Ω
Fig. 3
ECU
B2
SENSOR
C
1
2
2
2
2
1
1
1
B1
A
B004722E03
Tester Connection
Specified Condition
Connector A terminal 1 - Connector
B1 terminal 1
Below 1
Ω
Connector B2 terminal 1 - Connector
C terminal 1
10 k
Ω or higher
Fig. 4
0 V
ECU
B
SENSOR
A
C
1
2
2
2
2
1
1
5 V
5 V
Z017007E02
Tester Connection
Specified Condition
Connector A terminal 1 - Body
ground
5 V
Connector B terminal 1 - Body
ground
5 V
Connector C terminal 1 - Body
ground
Below 1 V
IN–48
INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
IN
3.
CHECK FOR SHORT CIRCUIT
(a) If the wire harness is ground shorted (Fig. 5), locate
the section by conducting a resistance check with
the body ground (below).
(b) Check the resistance with the body ground.
(1) Disconnect connectors A and C and measure
the resistance.
Standard resistance (Fig. 6)
HINT:
Measure the resistance while lightly shaking the
wire harness vertically and horizontally. If your
results match the examples above, a short
circuit exists between terminal 1 of connector A
and terminal 1 of connector C.
(2) Disconnect connector B and measure the
resistance.
Standard resistance (Fig. 7)
If the results match the examples above, a short
circuit exists between terminal 1 of connector B2
and terminal 1 of connector C.
4.
CHECK AND REPLACE ECU
NOTICE:
•
The connector should not be disconnected from
the ECU. Perform the inspection from the
backside of the connector on the wire harness
side.
•
When no measuring condition is specified,
perform the inspection with the engine stopped
and the ignition switch ON.
•
Check that the connectors are fully seated. Check
for loose, corroded or broken wires.
Fig. 5
ECU
B
SHORT
A
C
1
2
2
2
1
1
Z017008E02
Fig. 6
ECU
B
SENSOR
A
C
1
2
2
2
1
1
Z017009E02
Tester Connection
Specified Condition
Connector A terminal 1 - Body
ground
Below 1
Ω
Connector A terminal 2 - Body
ground
10 k
Ω or higher
Fig. 7
ECU
B1
SENSOR
A
C
1
2
2
2
1
1
B2
2
1
Z017808E02
Tester Connection
Specified Condition
Connector A terminal 1 - Body
ground
10 k
Ω or higher
Connector B2 terminal 1 - Body
ground
Below 1
Ω
INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
IN–49
IN
(a) First, check the ECU ground circuit. If it is faulty,
repair it. If it is normal, the ECU could be faulty.
Temporarily replace the ECU with a normally
functioning one and check if the symptoms occur. If
the trouble symptoms disappear, replace the
original ECU.
(1) Measure the resistance between the ECU
ground terminal and body ground.
Standard resistance:
Below 1
Ω
(2) Disconnect the ECU connector. Check the
ground terminal on the ECU side and wire
harness side for bending, corrosion or foreign
matter. Lastly, check the contact pressure of the
female terminals.
Example:
Ground
IN00383E02
W/H Side
ECU Side
Wire Harness Side
Ground
Ground
IN00384E03
IN–50
INTRODUCTION – TERMS
IN
TERMS
ABBREVIATIONS USED IN MANUAL
ABBREVIATIONS
MEANING
1st
First
2nd
Second
2WD
Two Wheel Drive Vehicle (4 x 2)
3rd
Third
4th
Fourth
4WD
Four Wheel Drive Vehicle (4 x 4)
4WS
Four Wheel Steering System
5th
Fifth
A.D.D.
Automatic Disconnecting Differential
A/C
Air Conditioner
A/F
Air-Fuel Ratio
A/T, ATM
Automatic Transmission (Transaxle)
ABS
Anti-Lock Brake System
AC
Alternating Current
ACC
Accessory
ACIS
Acoustic Control Induction System
ACM
Active Control Engine Mount
ACSD
Automatic Cold Start Device
AFS
Adaptive Front-Lighting System
AHC
Active Height Control Suspension
AID
Air Injection Control Driver
ALR
Automatic Locking Retractor
ALT
Alternator
AMP
Amplifier
ANT
Antenna
APPROX.
Approximately
ASSB
Assembly Services Sdn. Bhd.
ASSY
Assembly
ATF
Automatic Transmission Fluid
AUTO
Automatic
AUX
Auxiliary
AVG
Average
AVS
Adaptive Variable Suspension
B/L
Bi-Level
B/S
Bore-Stroke Ratio
B+
Battery Voltage
BA
Brake Assist
BACS
Boost Altitude Compensation System
BAT
Battery
BDC
Bottom Dead Center
BTDC
Before Top Dead Center
BVSV
Bimetallic Vacuum Switching Valve
C/V
Check Valve
Calif.
California
CAN
Controller Area Network
CB
Circuit Breaker
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