Controlling the HCH II IPU Fan
#1
Controlling the HCH II IPU Fan
I'm planning to build a grid charger and I'd like to be able to use it without removing the battery from the car, so I'll need to be able to externally power the IPU fan.
I've found some info for the HCH-I (200hz PWM) but not much on the HCH-II fan; might be the same but inverted PWM signal.
I see from HybridAutomotive's older install instructions that the fan harness has 4 wires. Does anyone know which wires are relevant? Is it like 12v, gnd, pwm, something else? Or is it like 12v pwm, gnd, something1, something2?
Anyone know what connector that is?
I've found some info for the HCH-I (200hz PWM) but not much on the HCH-II fan; might be the same but inverted PWM signal.
I see from HybridAutomotive's older install instructions that the fan harness has 4 wires. Does anyone know which wires are relevant? Is it like 12v, gnd, pwm, something else? Or is it like 12v pwm, gnd, something1, something2?
Anyone know what connector that is?
#2
Re: Controlling the HCH II IPU Fan
I'm planning to build a grid charger and I'd like to be able to use it without removing the battery from the car, so I'll need to be able to externally power the IPU fan.
I've found some info for the HCH-I (200hz PWM) but not much on the HCH-II fan; might be the same but inverted PWM signal.
I see from HybridAutomotive's older install instructions that the fan harness has 4 wires. Does anyone know which wires are relevant? Is it like 12v, gnd, pwm, something else? Or is it like 12v pwm, gnd, something1, something2?
Anyone know what connector that is?
I've found some info for the HCH-I (200hz PWM) but not much on the HCH-II fan; might be the same but inverted PWM signal.
I see from HybridAutomotive's older install instructions that the fan harness has 4 wires. Does anyone know which wires are relevant? Is it like 12v, gnd, pwm, something else? Or is it like 12v pwm, gnd, something1, something2?
Anyone know what connector that is?
(+), tach, pwm, (-)
Get a high power 10A/12V PSU and short PWM to (-) and drive fan at full speed.
#3
Re: Controlling the HCH II IPU Fan
*2 diodes if the relay needs an external flyback diode.
#4
Re: Controlling the HCH II IPU Fan
If I am understanding this correctly, it can be accomplished with the relay you mention and Zener diode 1N4742. any chance you could confirm or explain a little more?
#5
Re: Controlling the HCH II IPU Fan
is there any way to force the fan to operate at full speed during normal car operation as well?
#6
Re: Controlling the HCH II IPU Fan
At least a couple of folks on here have experienced this after installing a Maxx Volts grid charger harness, and to my knowledge, it was never resolved or explained.
I suspect the same is true - short the PWM to ground, and you have full speed fan all the time.
I suspect the same is true - short the PWM to ground, and you have full speed fan all the time.
#8
Re: Controlling the HCH II IPU Fan
If the harness is removed from the car it has nothing to do with the charger. Sounds like you fubared something trying to mess with the car. PS, Why are you bumping 4 year old threads in multiple forums? Respect the forum by not posting the same crap in multiple threads.
#9
Re: Controlling the HCH II IPU Fan
I’m assuming this previous post is from Maxx Volts, as it’s come minutes after a quite rude exchange on eBay after I requested a refund. All I want, and I’m sure the other users with the same problem want, is a solution for how to get the fan back to normal operation.
if the fan operation was normal prior to installation and operation of the balance charger following the instructions exactly, and the issue with the fan accursed immediately after using the balance charger, and still occurs after removing it, it sounds like an issue the balance charger manufacturer would be interested in knowing and helping to resolve.
if the fan operation was normal prior to installation and operation of the balance charger following the instructions exactly, and the issue with the fan accursed immediately after using the balance charger, and still occurs after removing it, it sounds like an issue the balance charger manufacturer would be interested in knowing and helping to resolve.
Last edited by mwillenb; 01-18-2020 at 05:52 AM.
#10
Re: Controlling the HCH II IPU Fan
Originally Posted by Saad
Hi,
I just bought HCH 2007 only 53k miles driven and last serviced from honda at 50k miles. Everything is good so far. It gave me 53.6mpg (uk) on highway. Auto stop and battery looks perfect. The only issue I’m facing is that the fan runs constantly on high speed. Starts when I switch on and goes off after few seconds of switching off the engine. I have no idea about the grid chargers on anything. I don’t even know the history of the car related to grid charging. Hybrid batteries work looks OK to me. Did anybody find the solution of this problem?
TIA
Saad
I just bought HCH 2007 only 53k miles driven and last serviced from honda at 50k miles. Everything is good so far. It gave me 53.6mpg (uk) on highway. Auto stop and battery looks perfect. The only issue I’m facing is that the fan runs constantly on high speed. Starts when I switch on and goes off after few seconds of switching off the engine. I have no idea about the grid chargers on anything. I don’t even know the history of the car related to grid charging. Hybrid batteries work looks OK to me. Did anybody find the solution of this problem?
TIA
Saad
Was this an original or rebuilt or aftermarket battery in your car?
Last edited by ManieP; 01-18-2020 at 08:28 AM.
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