Check Short Circuit

(a) If the wire harness is ground shorted as shown in Fig. 5, locate the section by conducting a resistance check with the body ground in step (b).

Z17008

Z17008

(b) Check the resistance with the body ground.

(1) Disconnect connectors A and C and measure the resistance between terminals 1 and 2 of connector A and the body ground. Resistance: 10 KQ or higher

HINT:

Measure the resistance while lightly shaking the wire harness vertically and horizontally.

Between terminal 1 of connector A and body ground ^ Below 1 Q

Between terminal 2 of connector A and body ground ^ 10 KQ or higher Therefore, the cause is a short circuit between terminal 1 of connector A and terminal 1 of connector C.

(2) Disconnect connector B and measure the resistance between terminal 1 of connector A and the body ground, and terminal 1 of connector B2 and the body ground. In the case of Fig. 7:

Between terminal 1 of connector A and body ground ^ 10 KQ or higher Between terminal 1 of connector B2 and body ground ^ Below 1 Q

Therefore, the cause is a short circuit between terminal 1 of connector B2 and terminal 1 of connector C.

4. CHECK AND REPLACE ECU NOTICE:

• Start an inspection of the connector from the backside of the connector on the wire harness side with the connector connected to the ECU.

• When no measurement condition is specified, perform the inspection with the engine stopped and also the ignition switch ON.

(a) First check the ECU ground circuit. If it is faulty, repair it. If it is normal, the ECU could be faulty. In this case, replace the ECU with one that functions normally and check if the symptoms appear.

Wiring Diagram Player Toyota Hilux

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

(2) Disconnect the ECU connector, check the ground terminals on the ECU side and wire harness side for bends and check the contact pressure.

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