Z17808
Fig. 7
Sensor
ECU
C
A
1
2
1
2
1
2
2
1
B2
B1
IN0383
Example
Ground
IN0384
ECU Side
Ground
W/H Side
Ground
--
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
IN--25
(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.
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 . CHE CK AND RE P L ACE E CU
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
known good one and check if 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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