ICE comes on anyway

i think it's a combo of parking outside, and your driving parameters.

 

Thanks!

I was able to extract these metrics:

	ss.s	MPG	mi	1/100 gal
1	0.0	0.0	0.0	0.000
2	75.9	199.9	0.2	0.100
3	75.9	114.2	0.2	0.175
4	133.0	46.8	0.8	1.709
5	295.0	34.0	1.9	5.588
6	295.9	34.7	1.9	5.476
7	303.0	34.7	2.0	5.764
8	359.0	38.4	2.0	5.208

What surprised me is no evidence of the warm-up, initial gas consumption. During ordinary warm-up, the first ~45 seconds show a flat rate and then gas consumption follows the load. In this case, we only see the flat rate.

Bob Wilson

 

I tried again tonight but no luck. So after 3 mi, I manually ON-OFF the front defrost and recorded a more accurate video. I’ll post the metrics later.

I am thinking of a dash cam as they have a manual ‘save’. Also, it may be time to get a miniVci to see if the OP might be able to get a data dump showing the car going into “Front Defrost” mode. Finally, time to seek disassembly and/or repair instructions for switch bezel.

It is possible the switch is normally closed and the LED wired across the switch. So when the button is pressed, the LED lights but goes out when the switch closes again, the LED is off. The switch would be a two more activated and save a separate wire and control software to light the LED.

Bob Wilson

 

Back in post 662 you sat in the car in Park for 10 minutes before leaving. Can you try to replicate that? Maybe just 5 minutes?

 

You may need a more recent Techstream if it does not recognize the model.

Bob Wilson

 

I don’t follow the version vs model. When you connect, an early screen will hopefully let you know.

Regardless, see if you can find a STATE indicator that tracks “Front Defrost.”

Bob Wilson

 

Last nights manual, quick ON-OFF of "Front Defrost" ran exactly 3 minutes and 30 seconds. The heater was set to 77F.

Bob Wilson

 

It needs further testing, one result does not a trend make, but the 5 min. 'preconditioning' would be called a "work around." It doesn't address the root cause but at least it keeps the fuel consumption down.

I'll continue to try and replicate the symptom but I am limited by how long we'll have 40F weather in Dixie. In the meanwhile, see if a more recent version of Techstream might be floating in the pirate pool. <grins>

Caution, I had a pirate version of Techstream "phone home" and brick itself when I was trying to do some investigations using my home WiFi.

Bob Wilson

 

A HEAT wave!!!

.

 

It happened again but w/o video.

• 37F (2C)
• Light frost on windshield
• Put car in gear soon as READY and drove
• One stop leaving neighborhood
• Aggressive -50 mph as soon as possible
• ~1.1 mi notice engine on while setting cruise control
• ~2.9 mi back to EV

Bob Wilson

 

I want to add my "ICE came on" story, since it was 18F degrees this morning. I preheated the car via Remote Climate on my iPhone and then went on my way in EV Mode. Then came a place where I was behind a slow driver who kept driving way too close to the edge of the lane. So, I figured, I might as well pass. So, in Normal Mode, I pressed the pedal 3/4th of the way to the floor. This was over 100 Amps from the battery. But instead of passing on electric, the EV Mode icon stayed on, the black "EV" on green car symbol turned to a green outline, and the engine turned on and cranked right away to 3220 RPM. You might be thinking, "Aww gosh that poor engine!1!!" Well the transition from an ice cold cabin to 3220 RPM was very smooth, no roughness, so I guess that's the zero-weight portion of the oil making it smooth.

Anyway, the engine stayed on until the coolant temperature reached 130F degrees. I figured that marked the completion temperature of the warm-up cycle. (For you Prius c owners, it's 104F degrees to finish the warm up.) And each time thereafter that there was a need for me to pull about 120 A from the battery, the engine came back on and stayed on for part of the time, similar to HV mode.