Engine on Prius I is it the same as Yaris and Echo

Sorry, no. The camshaft and I understand the pistons are different as well as the engine control unit (ECU.) The block is the same but there may be other holes and mounting tabs we don't know about.

Any more details about the engine problem?

Bob Wilson

 

Owch!

The Prius engine uses an Atkinson cycle:

• partial intake valve open on first of compression stroke - this pushes some of the fuel-air mix back into the intake manifold, reducing the compression ratio.
• 13 to 1 expansion ratio - upon combustion, the power stroke provides a high expansion ratio to extract energy.

In theory, the same crankshaft might work but the pistons would be different from the other 1.5L engines. Definitely the intake valve camshaft would be different from an Echo/Scion engine. Then too, the engine controllers would be different since the Prius engine often shuts down.

We see Prius engine and engine/transmission pairs show up on Ebay from time to time. But getting one exported will be difficult. Yours is the first posting of an engine losing a piston rod through probably the oil pan. Any possibility of photos of the damaged engine?

Do you have a shop where you could rebuild the engine? Pulling the head and dropping the oil pan would give a better idea of the internal damage. I would expect at a minimum:

• pistons, piston pins and rods
• crankshaft
• new bearings (check case for damage)
• oil pump (why the rod departed?)
• valve seats, valves(?), guides e.t.c.

I rebuilt a 1500 cc VW engine many years ago but that was a primitive engine compared to the Prius engine.

Bob Wilson

 

[ame=http://en.wikipedia.org/wiki/Toyota_NZ_engine]Toyota NZ engine - Wikipedia, the free encyclopedia[/ame]
Looks like the basic block is the same, but it is clear the head is different. Comparing a parts list would be interesting.

 

The block is machined differently to offset the bores of the cylinders to the centre line of the crankshaft.

 

Last night, I searched for "prius engine" on Ebay and saw several 2001-03, NHW11 engines. I doubt if the NHW20 engine could be used.

Bob Wilson

 

i wonder if the NHW20 engine will work, all i could think of a difference is the intake manifold and a/c compressor

 

Things to check:

• engine sensors - everything that feeds to engine ECU
• engine actuators - check the variable valve control and throttle plate
• check the coolant line fittings and emissions piping
• check the transaxle fitting and alignment

It would be a lot easier if one has both an NHW11 and NHW20 engine side-by-side.

Bob Wilson

 

DTC P3101 is produced by the hybrid vehicle ECU. This is saying that either the engine did not start or is producing low output. Usually this would be accompanied by the engine ECU producing DTC P3191.

I suggest you check fuel line pressure, which should be at least 43 psi. If not, check the resistance across the circuit opening relay switched contacts when the relay coil is energized with 12VDC. The fuel pump is located within the fuel tank.

Check the iridium spark plugs, the correct gap is 1 to 1.1 mm (replace if the gap is too large, do not try to adjust the gap on worn plugs.) See if you have a spark by removing one plug at a time, reattaching the igniter to the plug, connecting the wiring harness connector to the igniter, grounding the plug shell, and then have someone try to start the car while you look at the plug to see if it is sparking.

Be careful of the high voltage. Do you smell unburned fuel being injected into the cylinder where the spark plug was removed?

Is the throttle plate and throttle body interior clean, so that you can see shiny metal? Clean the mass air flow sensor using MAF cleaner.

If you have the ability to perform a cylinder leakdown test, then you can assess the condition of the replacement engine's valves and piston rings.

If you have fuel and spark, the MAF and throttle are clean, and you think the engine is mechanically sound, then you may have to replace the engine ECU. Do a search for TSB EG011-03, which I've previously posted. Good luck.

 

That TSB was rendered obsolete by T-SB-0180-09 last June.