Z17808
Fig. 7
Sensor
2
1
A
B1
C
1
1
2
2
1
2
B2
ECU
IN0383
Example
Ground
IN0384
Ground
Ground
ECU Side
W/H Side
IN
−
32
−
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
1996 LAND CRUISER (RM451U)
(2)
Disconnect connector ”B” and measure the resis-
tance between terminal 1 of connector ”A” and body
ground, and terminal 1 of connector ”B2” and body
ground.
In the case of Fig. 7:
Between terminal 1 of connector ”A” and body
ground
→
No continuity
Between terminal 1 of connector ”B2” and body
ground
→
Continuity (short)
Therefore, it is found out that there is a short circuit
between terminal 1 of connector ”B2” and terminal
1 of connector ”C”.
8.
CHECK AND REPLACE ECU
First check the ECU ground circuit. If it is faulty, repair it. If it is
normal, the ECU could be faulty, so replace the ECU with a nor-
mal functioning one and check that the symptoms appear.
(1)
Measure the resistance between the ECU ground
terminal and the body ground.
Resistance: 1
Ω
or less
(2)
Disconnect the ECU connector, check the ground
terminals on the ECU side and the wire harness
side for bend and check the contact pressure.
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Version 1.00 - 12/21/2010