Sr20det MAF problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

boycelaforest707 · 09-30-2008, 11:27 AM

Freshly installed SR20DET problems with MAF...
Check the wiring from MAF to ecu, wires are correctly wired to pins 16,17 on ecu and wires are good.

Here is the problem:
I get NEGATIVE .6 VOLTS key on engine off from middle ground (black) to signal wire (white). If I unplug signal wire (PIN 16 from ECU) then I get 0 volts.

My middle ground on maf connector and ECU does not go to CHASSIS ground.

My question:
What would cause this? Bad ECU? Some ECU ground?
Also should these pins go to chassis ground somewhere or is there a seperate ECU ground?
13-GROUND
29- SENSOR GROUND
39 ECCS GROUND
48 ECCS GROUND

RACETUNE · 10-01-2008, 06:23 AM

Your questions:
What would cause this? anything electical.
Bad ECU? yes that is a possible.
Some ECU ground? yes that is also possible.
Also should these pins go to chassis ground somewhere or is there a seperate ECU ground? yes you can hook all those grounds to chassis ground.

boycelaforest707 · 10-06-2008, 11:58 AM

chassis grounded, problem fixed! Runs great!

09-30-2008, 11:27 AM	#1
boycelaforest707 Leaky Injector Join Date: Aug 2005 Location: Eureka, CA Posts: 106 Trader Rating: (0) Feedback Score: 0 reviews	Sr20det MAF problem Freshly installed SR20DET problems with MAF... Check the wiring from MAF to ecu, wires are correctly wired to pins 16,17 on ecu and wires are good. Here is the problem: I get NEGATIVE .6 VOLTS key on engine off from middle ground (black) to signal wire (white). If I unplug signal wire (PIN 16 from ECU) then I get 0 volts. My middle ground on maf connector and ECU does not go to CHASSIS ground. My question: What would cause this? Bad ECU? Some ECU ground? Also should these pins go to chassis ground somewhere or is there a seperate ECU ground? 13-GROUND 29- SENSOR GROUND 39 ECCS GROUND 48 ECCS GROUND __________________ 1991 240sx Hatchback 5spd

10-01-2008, 06:23 AM	#2
RACETUNE Zilvia Member Join Date: Jun 2004 Location: San Francisco & Los Angeles Age: 49 Posts: 238 Trader Rating: (0) Feedback Score: 0 reviews	Your questions: What would cause this? anything electical. Bad ECU? yes that is a possible. Some ECU ground? yes that is also possible. Also should these pins go to chassis ground somewhere or is there a seperate ECU ground? yes you can hook all those grounds to chassis ground. __________________ -Garage BOSO- -Racetune Engineering-

10-06-2008, 11:58 AM	#3
boycelaforest707 Leaky Injector Join Date: Aug 2005 Location: Eureka, CA Posts: 106 Trader Rating: (0) Feedback Score: 0 reviews	chassis grounded, problem fixed! Runs great! __________________ 1991 240sx Hatchback 5spd