Toyota Sienna Service Manual: Check and replace ecu
• When no measuring condition is specified, perform the inspection with the engine stopped and the ignition switch on.
• Check that the connectors are fully seated. Check for loose, corroded or broken wires.
(a) First, check the ECU ground circuit. If it is faulty, repair it. If it is normal, the ECU could be faulty.
Temporarily replace the ECU with a normally functioning one and check if the symptoms occur. If the trouble symptoms disappear, replace the original ECU.
(1) Measure the resistance between the ECU ground terminal and body ground.
Standard resistance: Below 1 Ω
(2) Disconnect the ECU connector. Check the ground terminal on the ECU side and wire harness side for bending, corrosion or foreign matter. Lastly, check the contact pressure of the female terminals.
Check for short circuit
(a) If the wire harness is ground shorted (Fig. 5), locate the section by
conducting a resistance check with the body ground (below).
(b) Check the resistance with the body ground.
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Other materials:
Trunk lid
Trunk lid and doors
Depending on the vehicle equipment and country
version, this setting may not be offered.
Via iDrive:
1. "CAR".
2. "Settings".
3. "Key button settings".
4. Select the symbol.
5. Select the desired setting:
"Tailgate"
The trunk lid is opened.
"Tailgate and door(s)"
The t ...
Buckling the safety belt
1. Guide the safety belt slowly over shoulder
and hip to put it on.
2. Insert the tongue plate into the safety belt
buckle. The safety belt buckle must engage
audibly.
When the safety belt is fastened, the driver's and
passenger's belt straps are automatically tightened
once after driving away.
Un ...
Removal
1. Disconnect cable from negative battery
terminal
2. REMOVE STEERING COLUMN COVER LOWER
(A) insert the key into the ignition key cylinder and
release the steering lock.
(B) turn the steering wheel clockwise to gain access to
the screw and remove the screw.
(c) Turn the steering whe ...
