Sr20 ecu shorting (pics) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s13Kurt · 08-28-2011, 12:59 AM

I need this fixed as soon as possible, and i've researched the issue and figured out the maf wiring is usually the culprit. I bought this car with this same circuit burnt and it was kinda fixed by jumping the circuit with solder (not the best job) and the car fired right up. What I need to stress is EVEN THO THE CAR RAN ON THE PATCHED ECU IT DID NOT RUN NEAR AS GOOD AS IT DID (for a short time) ON AN ECU THAT DID NOT HAVE A BURNT CIRCUIT. I would like to know why.

This ecu which I bought only lasted an hour when one hard bump in the road caused it to short on that same exact circuit. Im going to post pics and if anybody knows id like to find out what it goes too.

Part 2: Im also going to post pics of my maf wiring. Some of which rested up agaisnt the exhaust manifold and got a little crispy. I cut the sheath back and took a picture......my question is DOES THE BARE WIRE WRAPPED AROUND THE MAF WIRING CONTROL ANYTHING?, also I took a pic of the wiring where it looks like someone patched the harness in, and I would like to know if these wire colors are correct.

Thanks in advance for any help.

cotbu · 08-28-2011, 01:35 AM

The shielded wire around the mafs signal wire is connected to ground. do not splice it or even a single strand of it with the signal wire or it will cause problems. Your ecu shorted out again because you failed to repair the problem and it appears to be the wiring. Repair the wiring and bolt down the ecu.

b/w=power, white=signal, black=ground
cut all the wires at the shotty connections, and redo them making sure they go to the correct wires/pins on the mafs plug. the plug wires don't appear to be oem and you didn't specify upgrade or aftermarket, so you have to locate the correct pin position with the help of the Timmy or an FSM.

Also I would make sure the repair is good then get a known good ecu. Then test that funky ecu with the new wiring because if it's not completely fried it may bake your mafs... probably not?!

lol that burnt trace is for the fuel pump my bad.

08-28-2011, 12:59 AM	#1
s13Kurt Zilvia Member Join Date: May 2010 Location: georgia Posts: 224 Trader Rating: (5) Feedback Score: 5 reviews	Sr20 ecu shorting (pics) I need this fixed as soon as possible, and i've researched the issue and figured out the maf wiring is usually the culprit. I bought this car with this same circuit burnt and it was kinda fixed by jumping the circuit with solder (not the best job) and the car fired right up. What I need to stress is EVEN THO THE CAR RAN ON THE PATCHED ECU IT DID NOT RUN NEAR AS GOOD AS IT DID (for a short time) ON AN ECU THAT DID NOT HAVE A BURNT CIRCUIT. I would like to know why. This ecu which I bought only lasted an hour when one hard bump in the road caused it to short on that same exact circuit. Im going to post pics and if anybody knows id like to find out what it goes too. Part 2: Im also going to post pics of my maf wiring. Some of which rested up agaisnt the exhaust manifold and got a little crispy. I cut the sheath back and took a picture......my question is DOES THE BARE WIRE WRAPPED AROUND THE MAF WIRING CONTROL ANYTHING?, also I took a pic of the wiring where it looks like someone patched the harness in, and I would like to know if these wire colors are correct. Thanks in advance for any help.

08-28-2011, 01:35 AM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	The shielded wire around the mafs signal wire is connected to ground. do not splice it or even a single strand of it with the signal wire or it will cause problems. Your ecu shorted out again because you failed to repair the problem and it appears to be the wiring. Repair the wiring and bolt down the ecu. b/w=power, white=signal, black=ground cut all the wires at the shotty connections, and redo them making sure they go to the correct wires/pins on the mafs plug. the plug wires don't appear to be oem and you didn't specify upgrade or aftermarket, so you have to locate the correct pin position with the help of the Timmy or an FSM. Also I would make sure the repair is good then get a known good ecu. Then test that funky ecu with the new wiring because if it's not completely fried it may bake your mafs... probably not?! lol that burnt trace is for the fuel pump my bad. __________________ LoverTechnologies "Half Broken Things!"