Check Short Circuit

If the wire harness is ground shorted as in Fig. 5, locate the section by conducting a "continuity check with ground".

Z17008

Check the continuity with ground.

(1) Disconnect connectors "A" and "C" and measure the resistance between terminal 1 and 2 of connector "A" and body ground. In the case of Fig. 6:

Between terminal 1 of connector "A" and body ground ^ Continuity (short) Between terminal 2 of connector "A" and body ground ^ No continuity

Therefore, it is found out that there is a short circuit between terminal 1 of connector "A" and terminal 1 of connector "C".

Z17008

Sensor

(2) Disconnect connector "B" and measure the resistance 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. 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 normal functioning one and check that the symptoms appear.

Example

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(1) Measure the resistance between the ECU ground terminal and the body ground. Resistance: 1 Q or less

ECU Side

nr-nr

3 1=1 C

ZD 1 I C

=1 CZ1 t=

Ground

W/H Side

W/H Side

(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.

Z17808

IN0383

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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