Sienna AWD V6-3.3L (3MZ-FE) (2004)
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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 -> No continuity
Between terminal 1 of connector B2 and body ground -> Continuity (short)
Therefore, the cause is a short circuit between terminal 1 of connector B2 and terminal 1 of connector C.
4. CHECK AND REPLACE ECU
NOTE:
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Start an inspection of the connector from the backside of the connector on the wire harness side with the connector connected to the ECU.
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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.
1. Measure the resistance between the ECU ground terminal and body ground.
Resistance: 1 ohm 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.
Customer Problem Analysis
CUSTOMER PROBLEM ANALYSIS
HINT:
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In troubleshooting, the problem symptoms must be confirmed accurately, meaning that all preconceptions must be set aside in order to make an
accurate judgement. To ascertain what the problem symptoms are, it is extremely important to ask the customer about the problem and conditions
when it occurred.