how to use this manual general information - 757.org
how to use this manual general information - 757.org
how to use this manual general information - 757.org
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IN–28 INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED<br />
SYSTEMS<br />
Fig. 7<br />
Sensor<br />
Example<br />
Ground<br />
ECU Side<br />
W/H Side<br />
Ground<br />
C B2 B1 A<br />
1<br />
2<br />
1<br />
2<br />
1<br />
2<br />
1<br />
2<br />
Ground<br />
1997 TOYOTA T100 (RM507U)<br />
ECU<br />
Z17808<br />
IN0383<br />
IN0384<br />
(2) Disconnect connec<strong>to</strong>r ”B” and measure the resistance<br />
between terminal 1 of connec<strong>to</strong>r ”A” and body<br />
ground, and terminal 1 of connec<strong>to</strong>r ”B2” and body<br />
ground.<br />
Between terminal 1 of connec<strong>to</strong>r ”A” and body<br />
ground → No continuity<br />
Between terminal 1 of connec<strong>to</strong>r ”B2” and body<br />
ground → Continuity (short)<br />
Therefore, it is found out that there is a short circuit<br />
between terminal 1 of connec<strong>to</strong>r ”B2” and terminal<br />
1 of connec<strong>to</strong>r ”C”.<br />
8. CHECK AND REPLACE ECU<br />
First check the ECU ground circuit. If it is faulty, repair it. If it is<br />
normal, the ECU could be faulty, so replace the ECU with a normal<br />
functioning one and check that the symp<strong>to</strong>ms appear.<br />
(1) Measure the resistance between the ECU ground<br />
terminal and the body ground.<br />
Resistance: 1 Ω or less<br />
(2) Disconnect the ECU connec<strong>to</strong>r, check the ground<br />
terminals on the ECU side and the wire harness<br />
side for bend and check the contact pressure.
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