Where is the starter relay located on the engine?

on the side of the starter motor.
starter relay is the other part not there.
relays are in fuse/relay box.
no cranks have 6 causes.

Starter Motor Relay, 4.6L C166
Right rear of engine compartment C167
Right rear of engine compartment Starter Motor Relay, 5.4L C166
Right rear of engine compartment C167
Right rear of engine compartment

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Try the driver side fender mounted inside the L-shaped bracket supporting the carbon cannister

1. Connect the battery ammeter to the starter as shown in the illustration.

Fig. Fig. 4: Make the connections to the battery, ammeter and starter as shown here

1. Check the rotation of the starter, it must be smooth and steady with the pinion gear moving outwards. Compare the ammeter reading to the starter specifications chart.

REMOVAL & INSTALLATION

See Figure 5
Replacing the starter while the engine is cold is recommended. A hot engine can result in personal injury.

1. Disconnect the negative battery cable.
2. Remove the nut and disconnect the battery cable from the magnetic switch on the starter motor.
3. Disconnect the remaining electrical connections at the starter.
4. Remove the nuts and/or bolts securing the starter to the bell housing, then pull the starter toward the front of the vehicle to remove.

To install:

1. Insert the starter into the bell housing being sure that the starter drive teeth are engaged with the flywheel teeth, not jammed against the flywheel.
2. Tighten the attaching hardware to 29 ft. lbs. (39 Nm) and replace all electrical connections.

Fig. Fig. 5: Exploded view of a common starter mounting found on Toyota trucks

1. Connect the positive battery cable (starter wire) to the starter.
2. Connect the negative battery cable.

RELAY REPLACEMENT

See Figure 6
The starter relays on most of your Toyota trucks are located either in the relay block in the engine compartment or on the driver's side junction block. The cover for the relay compartments should be marked, "starter'' or the relay will have a part number with a suffix of 28300-XXXXX. Simply locate the relay, pull it out, and install a new one if needed.

Fig. Fig. 6: The relay may be located in the driver's side junction block or in the engine compartment relay block

When you go to start the engine you are actually sending power from the ignition switch through a 20 amp fuse [crank fuse] then through the Park/Nuetral safety start switch and finally to the starter relay [located at the center rear of the engine compartment] This relay then sends a more powerful current flow down to the starter solenoid located on top of the the starter which then closes and allows full battery voltage from the large battery cable to energize and spin the starter. I don't think I've ever had to replace a starter relay on these but have replaced a large number of starters with bad solenoids and bad Park/nuetral switches. The "crank" fuse could also be bad but that is also pretty rare.

Your Starter Relay, located in the Relay/Fuse Box/Panel is sticking and causing the Starter "Run-On".
Locate the Starter Relay in the Relay/Fuse Box/Panel.
The identification and location of the Relays/Fuses should be located in your Owners Manual, or on the inside rear Cover.
There are usually Relays in the Box/Panel which are the same Type (size and shape). Switch out the suspected bad Starter Relay with another non-engine Relay that is KNOWN to work.
Recheck the operations of both these functions.
If the Starter is not still experiencing "Run-On" and the other function is now malfunctioning. The suspected Relay is bad and needs to be replaced.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

1. Check the Starter Relay located in the PDC = Power Distribution Center located in the engine compartment on the left side. Remove the cover. The Fuse and Relay location/identification should be on the back (inside) of the cover. Also check your owners manual for addtional information on the Fuse and Relay identification/location.
2. After locating the Starter Relay: There should be a Spare Relay; IF NOT then LOCATE a non-engine operation Relay (on a function that works!) of similar Type and Size and switch these out. Again check for Starter Operation. If this works: then the original Relay is bad and must be replaced. If it does not work, and the other non-engine function you switched out with does still work, then the Relay was not the problem.
If this does not work:
3. With a partner at the wheel: You go under the front of the vehicle. Locate the Starter which should be on the front of the engine. Using a heavy gage jumper wire. Touch one end of the jumper wire to the large (red) wire connection (bolt/nut). Touch the other end to the main body of the Starter Motor. The Starter has two components: the Starter Solenoid and the Starter Motor. They are integrated/combined into one unit. The Starter Solenoid is the Smaller of the cylindrical shapes. The Starter Motor is the Larger of the cylindrical shapes. Have your partner turn the Key to the Start Position. If it Starts, then the Starter Solenoid is bad and the Starter (Solenoid & Motor) Unit must be replaced.
Let me know if this helped, or if you have additional questions or information. Feel free to contact me on FixYa.com!

The starter relays on most of your Toyota trucks are located either in the relay block in the engine compartment or on the driver's side junction block. The cover for the relay compartments should be marked, "starter'' or the relay will have a part number with a suffix of 28300-XXXXX. Simply locate the relay, pull it out, and install a new one if needed.

RELAY REPLACEMENT

The relay may be located in the driver's side junction block or in the engine compartment relay block

I hope helps with this (remember rated this help) Good luck.

should be in the engine compartment on drivers side/most of your main engine relays are there/should be a fuse box...

The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.
The starter relay is in position #56 of that box.