ZL1 LSA Supercharger intercooler pump inside look - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

audiomikej · 10-15-2012, 05:11 PM

Part 1 of 2
In my quest to understand how the ZL1 Supercharger works I needed to understand how the intercooler pump functions. The 5 pin interface had me intrigued. So I disassembled and found a microprocessor controlled 3-phase motor with one moving part. It is definitely designed for long term, leak free use. If your pump ever stops working remove the 5 T20 torx screws and inspect for junk lodged in the impeller because there really is not much there to fail. The microprocessor is a PIC33FJ32MC202 controlling the A4935 3-phase MOSFET driver. The IC pump also does not use a mechanical relay to power on. It has an integrated soft start MOSFET switch. Another nice feature with this pump is its ability to detect and report fault conditions back to the main ECM.

audiomikej · 10-15-2012, 05:11 PM

Part 2 of 2
Reserved for wiring info. Does anybody know the PED number of the 5 pin female connector that plugs into the IC pump? It should be molded right into the connector.

audiomikej · 01-14-2014, 07:58 AM

pin 1 switched source
pin 4 ground
pin 5 +12V

realsquash · 01-14-2014, 09:09 PM

I'm curious, do they vary the speed of the pump on the ZL1 or is it always on?

grocerygetter · 01-14-2014, 10:57 PM

Too much bs right there...they must vary speed

ducatisl · 01-19-2014, 11:04 AM

Nice work, thanks!

Quote:

Originally Posted by audiomikej

pin 1 switched source
pin 4 ground
pin 5 +12V

realsquash · 01-19-2014, 11:16 AM

What are on pins 2 and 3? Are they CAN?

stevieturbo · 01-19-2014, 12:04 PM

very good chance of it, yes.

That way they can control the pump speed, and monitor whether it is working or not I'd think, and if there is a problem, report that back to the ecu.

radrace19 · 01-20-2014, 02:23 PM

Quote:

Originally Posted by realsquash

What are on pins 2 and 3? Are they CAN?

Andy,
The pump an the ZL1 is not CAN controlled.
Both pin 1 and 5 go to a switched 12V power supply in the fuse panel.

This pump on the Volt does have output to the ECU

This is the pinout on the Volt

Pin
1 - Electric Coolant Motor Enable
2 - Electric Motor Feedback Signal
3 - Electric Coolant Motor Control
4 - Ground
5 - Battery Positive Voltage

And here is the ZL1 diagram for reference

-Greg

realsquash · 01-20-2014, 02:44 PM

Ah so they PWM it, that's easier

I am just curious what their control strategy is. I'm sure it has more to do with reducing the electrical load than performance but it would be interesting to see.

radrace19 · 01-20-2014, 03:01 PM

Dug this info up for you

Quote:

The hybrid/EV electronics coolant pump circulates coolant through the power electronics coolant radiator, hybrid/EV powertrain control module 1, and the battery charger to control the temperature of the hybrid/EV powertrain control module 1 and the battery charger. An enable signal from the hybrid/EV powertrain control module 2 to the hybrid/EV electronics coolant pump provides overall control of the pump. When this circuit is high, the pump can operate. The pump is controlled with a pulse-width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV electronics coolant pump. The higher the duty cycle the higher the pump speed. The hybrid/EV electronics coolant pump provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information. The hybrid/EV electronics coolant pump has some self-diagnostic capability. If it determines there is an internal fault it provides this information on this same feedback circuit instead of pump speed information.

rp0029 · 12-28-2014, 09:30 PM

Talk about thread resurrection. I've slapped a blower on my 68 Camaro - a ZL1, and have this pump mounted to my frame rail. My computer is from like a 2003 van (so I can have the drive by cable, which I prefer), and there is noooo way it can control this sucker. If I just wanted to have this pump run full steam 100% of the time, is there a way I can hard wire it? Does anyone know?

audiomikej · 12-29-2014, 08:30 PM

Quote:

Originally Posted by rp0029

Talk about thread resurrection. I've slapped a blower on my 68 Camaro - a ZL1, and have this pump mounted to my frame rail. My computer is from like a 2003 van (so I can have the drive by cable, which I prefer), and there is noooo way it can control this sucker. If I just wanted to have this pump run full steam 100% of the time, is there a way I can hard wire it? Does anyone know?

Quote:

Originally Posted by audiomikej

pin 1 switched source
pin 4 ground
pin 5 +12V

I posted already

pin 1 switched source
pin 4 ground
pin 5 +12V

rp0029 · 03-01-2015, 02:37 PM

I finally have this plugged up to my 68 as per the pinout above. Pump shuts off after about 3 minutes of running, and to restart you have to cut and restore power to the pump. If you restart it enough times, it starts to make a grinding, quacking noise.

I am assuming that there is some sort of built in overheat prevent device and that by just plugging in +12 to pins 1 and 5 and GND to pin 4, it runs so fast that it overheats and shuts down. It seems that the ECU must modulate the speed of the pump, and that having the pump on 100% of the time full blast is not feasible.

In short, it looks like I either need a new pump or a way to PWM to pin 3 to run less of a speed.

Any thoughts, anyone?

10-15-2012, 05:11 PM	#1
audiomikej Drives: the wife crazy talking Camaros Join Date: Aug 2010 Location: Lincoln, NE Posts: 277 View My Garage	ZL1 LSA Supercharger intercooler pump inside look Part 1 of 2 In my quest to understand how the ZL1 Supercharger works I needed to understand how the intercooler pump functions. The 5 pin interface had me intrigued. So I disassembled and found a microprocessor controlled 3-phase motor with one moving part. It is definitely designed for long term, leak free use. If your pump ever stops working remove the 5 T20 torx screws and inspect for junk lodged in the impeller because there really is not much there to fail. The microprocessor is a PIC33FJ32MC202 controlling the A4935 3-phase MOSFET driver. The IC pump also does not use a mechanical relay to power on. It has an integrated soft start MOSFET switch. Another nice feature with this pump is its ability to detect and report fault conditions back to the main ECM. Attached Images

01-14-2014, 09:09 PM	#4
realsquash Drives: Four Door Camaro Join Date: Apr 2010 Location: SE WI Posts: 189	I'm curious, do they vary the speed of the pump on the ZL1 or is it always on? __________________ Squash Performance LLC 2010+ Camaro 800 LPH fuel systems

01-14-2014, 10:57 PM	#5
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	Too much bs right there...they must vary speed __________________ -John S.

01-19-2014, 11:16 AM	#7
realsquash Drives: Four Door Camaro Join Date: Apr 2010 Location: SE WI Posts: 189	What are on pins 2 and 3? Are they CAN? __________________ Squash Performance LLC 2010+ Camaro 800 LPH fuel systems

01-20-2014, 02:44 PM	#10
realsquash Drives: Four Door Camaro Join Date: Apr 2010 Location: SE WI Posts: 189	Ah so they PWM it, that's easier I am just curious what their control strategy is. I'm sure it has more to do with reducing the electrical load than performance but it would be interesting to see. __________________ Squash Performance LLC 2010+ Camaro 800 LPH fuel systems

01-14-2014, 07:58 AM	#3
audiomikej Drives: the wife crazy talking Camaros Join Date: Aug 2010 Location: Lincoln, NE Posts: 277 View My Garage	pin 1 switched source pin 4 ground pin 5 +12V

01-19-2014, 12:04 PM	#8
stevieturbo Drives: it changes Join Date: Nov 2010 Location: Norn Iron Posts: 1,126	very good chance of it, yes. That way they can control the pump speed, and monitor whether it is working or not I'd think, and if there is a problem, report that back to the ecu.

12-28-2014, 09:30 PM	#12
rp0029 Drives: none yet Join Date: Oct 2013 Location: United States Posts: 6	Talk about thread resurrection. I've slapped a blower on my 68 Camaro - a ZL1, and have this pump mounted to my frame rail. My computer is from like a 2003 van (so I can have the drive by cable, which I prefer), and there is noooo way it can control this sucker. If I just wanted to have this pump run full steam 100% of the time, is there a way I can hard wire it? Does anyone know?

03-01-2015, 02:37 PM	#14
rp0029 Drives: none yet Join Date: Oct 2013 Location: United States Posts: 6	I finally have this plugged up to my 68 as per the pinout above. Pump shuts off after about 3 minutes of running, and to restart you have to cut and restore power to the pump. If you restart it enough times, it starts to make a grinding, quacking noise. I am assuming that there is some sort of built in overheat prevent device and that by just plugging in +12 to pins 1 and 5 and GND to pin 4, it runs so fast that it overheats and shuts down. It seems that the ECU must modulate the speed of the pump, and that having the pump on 100% of the time full blast is not feasible. In short, it looks like I either need a new pump or a way to PWM to pin 3 to run less of a speed. Any thoughts, anyone?