Computer flash and MPG

DanMan32 · 04-24-2005, 04:49 PM

MIL and CEL are different lights. MIL is the triangle of doom. Check Engine Light usually indicates an emissions problem but should not prohibit driving.

Kyle Pehrson · 04-24-2005, 05:11 PM

mil & cel are the same thing the triangle of doom is hv malf.
toyota calls the check engine light the malfunction indicator light. GM calls it a check engine light.

Liam · 04-24-2005, 05:29 PM

My car is an October 2003 build. I did get the 40D flash in 2004 but did not noticed any difference in MPG. The car has never had a lower tank average than 46, most tanks at 50-51. This spring with 45000 miles on the car I have noticed an incredible jump in MPG. The last 4 tanks have been 54-55 MPG. It could be the excellent warm dry weather we have had in the last 3 weeks, or is there a 45000 mile breakin period? Still using original tires.

Frank Hudon · 04-24-2005, 10:04 PM

thanks Liam, I was just wondering as the computer replacement has made a tremendous difference in the mileage. The origional HV (hybrid vehicle) computer wouldn't accept the flash and was replaced as a consequence.

Kyle Pehrson · 04-24-2005, 11:50 PM

Frank I don't think that the 40D had any pos or neg effect on the gas milage unless unknow to the owner the engine ecu was reprogramed also. I never had any one say that thier gas milage went up after the 40D.
The calibration that is reprogramed for the 40D is not the same calibration that is used on the new ecu's or in the new cars the program changed shortly after 40D came out. I have replaced the H.V. ECU and have no seen or heard of any inprovement in gas milage.

Frank Hudon · 04-25-2005, 12:16 AM

thanks for the input Kyle, that was the only thing done to the car and like I initally said the MPG has risen by about 8 MPG. Also the car goes into S4 way sooner. I can only assume that the computer was the problem then. Thanks.

04-24-2005, 05:29 PM	#13
Liam Member Join Date: Jan 2004 Posts: 96 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Re: Computer flash and MPG My car is an October 2003 build. I did get the 40D flash in 2004 but did not noticed any difference in MPG. The car has never had a lower tank average than 46, most tanks at 50-51. This spring with 45000 miles on the car I have noticed an incredible jump in MPG. The last 4 tanks have been 54-55 MPG. It could be the excellent warm dry weather we have had in the last 3 weeks, or is there a 45000 mile breakin period? Still using original tires.

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04-24-2005, 04:49 PM	#11
DanMan32 Join Date: Aug 2004 Location: Tampa Bay, FL Posts: 3,775 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	MIL and CEL are different lights. MIL is the triangle of doom. Check Engine Light usually indicates an emissions problem but should not prohibit driving.

04-24-2005, 05:11 PM	#12
Kyle Pehrson Prius Master Tech Join Date: Feb 2005 Location: S.L.C. Utah Posts: 122 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	mil & cel are the same thing the triangle of doom is hv malf. toyota calls the check engine light the malfunction indicator light. GM calls it a check engine light.

04-24-2005, 10:04 PM	#14
Frank Hudon Senior Member Join Date: Jan 2004 Posts: 4,144 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	thanks Liam, I was just wondering as the computer replacement has made a tremendous difference in the mileage. The origional HV (hybrid vehicle) computer wouldn't accept the flash and was replaced as a consequence.

04-24-2005, 11:50 PM	#15
Kyle Pehrson Prius Master Tech Join Date: Feb 2005 Location: S.L.C. Utah Posts: 122 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Frank I don't think that the 40D had any pos or neg effect on the gas milage unless unknow to the owner the engine ecu was reprogramed also. I never had any one say that thier gas milage went up after the 40D. The calibration that is reprogramed for the 40D is not the same calibration that is used on the new ecu's or in the new cars the program changed shortly after 40D came out. I have replaced the H.V. ECU and have no seen or heard of any inprovement in gas milage.

04-25-2005, 12:16 AM	#16
Frank Hudon Senior Member Join Date: Jan 2004 Posts: 4,144 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	thanks for the input Kyle, that was the only thing done to the car and like I initally said the MPG has risen by about 8 MPG. Also the car goes into S4 way sooner. I can only assume that the computer was the problem then. Thanks.