Toyota Tundra (2015 year). Manual — part 5
Last Modified: 9-16-2014
6.6 F
Doc ID: RM000000UZ30F6X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
1. BASIC INSPECTION
(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS
(1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of
20°C (68°F). Resistance measurements may be inaccurate if measured at high temperatures, i.e.
immediately after the vehicle has been running. Measurements should be made after the engine has
cooled down.
(b) HANDLING CONNECTORS
(1) When disconnecting a connector, first squeeze the mating
halves tightly together to release the lock, and then press
the lock claw and separate the connector.
(2) When disconnecting a connector, do not pull on the
harnesses. Grasp the connector directly and separate it.
(3) Before connecting a connector, check that there are no
deformed, damaged, loose or missing terminals.
(4) When connecting a connector, press firmly until it locks with
a "click" sound.
(5) If checking a connector with a TOYOTA electrical tester,
check the connector from the backside (harness side) using a
mini test lead.
NOTICE:
(1) Checking when a connector is connected: Squeeze the connectors together to confirm that they are
fully connected and locked.
(2) Checking when a connector is disconnected: Check by pulling the wire harness lightly from the
conductor wires. Check visually for corrosion, metallic or foreign matter and water, and bent, rusted,
overheated, contaminated, or deformed terminals.
check for ample tension when inserting and after full
engagement.
NOTICE:
When testing a gold-plated female terminal, always use a
gold-plated male terminal.
(d) REPAIR METHOD OF CONNECTOR TERMINAL
(1) If there is any foreign matter on the terminal, clean the
contact point using an air gun or cloth. Never rub the contact
point using sandpaper as the plating may come off.
(2) If there is abnormal contact pressure, replace the female
terminal. If the male terminal is gold-plated (gold color), use
a gold-plated female terminal; if it is silver-plated (silver
color), use a silver-plated female terminal.
(3) Damaged, deformed, or corroded terminals should be
replaced. If the terminal does not lock into the housing, the
housing may have to be replaced.
(e) HANDLING OF WIRE HARNESS
(1) If removing a wire harness, check the wiring and clamping
before proceeding so that it can be restored in the same
way.
(2) Never twist, pull or slacken the wire harness more than
necessary.
(3) The wire harness should never come into contact with a high
temperature part, or rotating, moving, vibrating or
sharp-edged parts. Avoid contact with panel edges, screw
tips and other sharp items.
(4) When installing parts, never pinch the wire harness.
2. CHECK FOR OPEN CIRCUIT
(a) For an open circuit in the wire harness in Fig. 1, check the resistance or voltage, as described below.
(b) Check the resistance.
(1) Disconnect connectors A and C and measure the resistance between them.
Standard resistance (Fig. 2):
TESTER CONNECTION
SPECIFIED CONDITION
Connector A terminal 1 - Connector C terminal 1
10 kΩ or higher
Connector A terminal 2 - Connector C terminal 2
Below 1 Ω
HINT:
Measure the resistance while lightly shaking the wire harness vertically and horizontally.
(2) Disconnect connector B and measure the resistance between
the connectors.
Standard resistance (Fig. 3):
TESTER CONNECTION
SPECIFIED
CONDITION
Connector A terminal 1 - Connector B1
terminal 1
Below 1 Ω
Connector B2 terminal 1 - Connector C
terminal 1
10 kΩ or higher
If the results match the examples above, an open circuit
(c) Check the voltage.
(1) In a circuit in which voltage is applied to the ECU connector
terminal, an open circuit can be checked by conducting a
voltage check.
With each connector still connected, measure the voltage
between the body ground and these terminals (in this
Standard voltage (Fig. 4):
TESTER CONNECTION
SPECIFIED CONDITION
Connector A terminal 1 - Body ground
5 V
Connector B terminal 1 - Body ground
5 V
Connector C terminal 1 - Body ground
Below 1 V
If the results match the examples above, an open circuit
exists in the wire harness between terminal 1 of
(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.
(1) Disconnect connectors A and C and measure the resistance.
Standard resistance (Fig. 6):
TESTER CONNECTION
SPECIFIED CONDITION
Connector A terminal 1 - Body ground
Below 1 Ω
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