Nissan Leaf A/C compressor 92600-3NF0A

[abetanco]

Good morning, yes, I'd be happy to. sorry for the late response. Give me a couple of days to organize a response and I'll share the code. Hopefully I can answer any questions you have. The main idea of the code is to continuously (once every 200 ms or so) send a message to the compressor, and make the message look like a LIN signal, even though it is a UART signal. Code coming up soon...

[abetanco]

hi,are you able to share the Arduino sketch,I also have the dream to have AC running using the leaf compressor,i have 3 compressors sitting down in my garage,im also wondering how you run and monitor the compressor pressure,how do you accomplish this?thanks

Good morning, yes, I'd be happy to. sorry for the late response. Give me a couple of days to organize a response and I'll share the code. Hopefully I can answer any questions you have. The main idea of the code is to continuously (once every 200 ms or so) send a message to the compressor, and make the message look like a LIN signal, even though it is a UART signal. Code coming up soon...

[joeflickers]

Good morning, yes, I'd be happy to. sorry for the late response. Give me a couple of days to organize a response and I'll share the code. Hopefully I can answer any questions you have. The main idea of the code is to continuously (once every 200 ms or so) send a message to the compressor, and make the message look like a LIN signal, even though it is a UART signal. Code coming up soon...

Excellent.. My compressor is different but from Johus but it's from a gen 2 nissan leaf.. I'll share pictures and possibly assist me in knowing the pinout too

[JeffP93]

This is awesome. I'm just starting my conversion and have everything sorted except for controlling the leaf compressor.

Very interested in the Arduino code you've got working.

[tom91]

Give me a couple of days to organize a response and I'll share the code.

Do you have part numbers for the compressor you have running? I am tempted to look into the 926005SA1B as these are going cheap in the UK

[joeflickers]

Excellent.. My compressor is different but from Johus but it's from a gen 2 nissan leaf.. I'll share pictures and possibly assist me in knowing the pinout
I Have two compressors with part numbers 9192000 AND 9192001

[abetanco]

Hi All,

I think my compressor is a Denso ES27C, but the tag is hard to read.

The code is as follows. Basically, it is a way to make the Arduino send a UART message that looks like a LIN message. Let me know if you have any questions!

****BEGINNING OF CODE****

#define EVAP_VOLTAGE_7_PIN 7

int brklen = 14; // 13 bits + 1 bit for break delimiter
uint8_t sync = 0x55;
uint8_t addr = 0xfb;
uint8_t buf[8] = {0xb3, 0x00, 0x00, 0x90, 0xFF, 0x00, 0x00, 0x00};
uint8_t cksum = 0xb7;
int baud = 19200;
uint16_t brk = (brklen*1000000/baud); // brk in microseconds

void setup() {
pinMode(18, OUTPUT);
pinMode(EVAP_VOLTAGE_7_PIN, INPUT_PULLUP);
Serial.flush();
Serial.begin(baud);
Serial.print(brk);
}

void loop() {

int evap_voltage_7_status = digitalRead(EVAP_VOLTAGE_7_PIN);

while (evap_voltage_7_status == HIGH) {
buf[0] = 0xb3;
buf[1] = 0x0c;
cksum = 0xb3;
} else {
buf[0] = 0xb2;
buf[1] = 0x00;
cksum = 0xc1;
}

pinMode(5, OUTPUT);
digitalWrite(5, HIGH);
digitalWrite(18, LOW);
delayMicroseconds(brk); // For 19,200 Baud, brk should be 677us for brklen of 14us
// or 729us for brklen of 13us.
digitalWrite(18, HIGH);
Serial1.begin(baud);
Serial1.write(sync);
Serial1.write(addr);
Serial1.write(buf[0]);
Serial1.write(buf[1]);
Serial1.write(buf[2]);
Serial1.write(buf[3]);
Serial1.write(buf[4]);
Serial1.write(buf[5]);
Serial1.write(buf[6]);
Serial1.write(buf[7]);
Serial1.write(cksum);
delay(200);
Serial1.end();
Serial.println(buf[1]);
Serial.println("Evaporator On");
}
buf[0] = 0xb2;
buf[1] = 0x00;
cksum = 0xc1;
Serial1.println("Evaporator Off");
}

****END OF CODE****

Let me know if you have trouble with it. I snipped portions of my code out that were specific to my application, so let me know if the above code doesn't work or if you have any questions.

[tom91]

I think my compressor is a Denso ES27C,

Can you please take pictures of your compressor and share them?

[abetanco]

These are the images from the eBay listing, since it is hard to take a photo of my compressor in my vehicle.

[abetanco]

It is a ES27C according to the listing, and it is from 2015 according to the listing.

[abetanco]

I think these are used in Nissan Leaf SV and SL editions.

[joeflickers]

Hi All,

I think my compressor is a Denso ES27C, but the tag is hard to read.

The code is as follows. Basically, it is a way to make the Arduino send a UART message that looks like a LIN message. Let me know if you have any questions!

****BEGINNING OF CODE****

#define EVAP_VOLTAGE_7_PIN 7

int brklen = 14; // 13 bits + 1 bit for break delimiter
uint8_t sync = 0x55;
uint8_t addr = 0xfb;
uint8_t buf[8] = {0xb3, 0x00, 0x00, 0x90, 0xFF, 0x00, 0x00, 0x00};
uint8_t cksum = 0xb7;
int baud = 19200;
uint16_t brk = (brklen*1000000/baud); // brk in microseconds

void setup() {
pinMode(18, OUTPUT);
pinMode(EVAP_VOLTAGE_7_PIN, INPUT_PULLUP);
Serial.flush();
Serial.begin(baud);
Serial.print(brk);
}

void loop() {

int evap_voltage_7_status = digitalRead(EVAP_VOLTAGE_7_PIN);

while (evap_voltage_7_status == HIGH) {
buf[0] = 0xb3;
buf[1] = 0x0c;
cksum = 0xb3;
} else {
buf[0] = 0xb2;
buf[1] = 0x00;
cksum = 0xc1;
}

pinMode(5, OUTPUT);
digitalWrite(5, HIGH);
digitalWrite(18, LOW);
delayMicroseconds(brk); // For 19,200 Baud, brk should be 677us for brklen of 14us
// or 729us for brklen of 13us.
digitalWrite(18, HIGH);
Serial1.begin(baud);
Serial1.write(sync);
Serial1.write(addr);
Serial1.write(buf[0]);
Serial1.write(buf[1]);
Serial1.write(buf[2]);
Serial1.write(buf[3]);
Serial1.write(buf[4]);
Serial1.write(buf[5]);
Serial1.write(buf[6]);
Serial1.write(buf[7]);
Serial1.write(cksum);
delay(200);
Serial1.end();
Serial.println(buf[1]);
Serial.println("Evaporator On");
}
buf[0] = 0xb2;
buf[1] = 0x00;
cksum = 0xc1;
Serial1.println("Evaporator Off");
}

****END OF CODE****

Let me know if you have trouble with it. I snipped portions of my code out that were specific to my application, so let me know if the above code doesn't work or if you have any questions.

Thanks for Sharing.. My compressor is different from this

[abetanco]

Thanks for Sharing.. My compressor is different from this

You should still be able to use the LIN code, but you will have to check if someone else on this forum or somewhere else has hacked your compressor. Once you have the correct message to send, you should be able to use my code.

Good luck, and let me know if you have more questions.

[joeflickers]

You should still be able to use the LIN code, but you will have to check if someone else on this forum or somewhere else has hacked your compressor. Once you have the correct message to send, you should be able to use my code.

Good luck, and let me know if you have more questions.

[joeflickers]

You should still be able to use the LIN code, but you will have to check if someone else on this forum or somewhere else has hacked your compressor. Once you have the correct message to send, you should be able to use my code.

Good luck, and let me know if you have more questions.

what is the minimum voltage required of the HV side of the compressor?

[abetanco]

what is the minimum voltage required of the HV side of the compressor?

Great work! I don't know, unfortunately, but I vaguely recall finding online that some similar compressors have an operating range of between 200 to 400 V DC. You could try checking out the service manuals, specifically the HA (Heater and Air Conditioning System) and HAC (Heater and Air Conditioning System Control) portions:
https://www.nicoclub.com/nissan-service-manuals

Otherwise, Mark Lines has some teardown reports that may be available free online.