Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - Using Consult and ECUTalk, O2 sensor not showing voltage?

bad dog · 12-31-2012, 06:38 AM

i am no expert , but have you reset your ecu/ecm , if not do that 1st , manual or automatic tranny .

the iat is the round plug close to the air filter , there are 2 there , one is the maf sensor , its the bigger of the two, the other is the iat sensor , its the round one .

the iat sensor is a thermister meaning as the temp goes up the resistence of the sensor goes down , if you ohm it and measure resistance it shoud be about 2500 ohm at 68 degrees , just remove the connector at the sensor and measure the resistance of the sensor , if its open ( no resistance ) you could put a resistor across the 2 wires going to the ecu , use about 2100-2900 ohms , the ecu will think the iat sensor is ok.

as far as the wiring to the ecm/ecu goes , the iat sensor 2 wires go to pins 63 and 50 of the ecu , if you have a automatic tranny the wire from pin 50 goes to pin 35 of the AT control unit ,this is the ground .

google up (Manuals > USDM Cars > 1997 240SX (KA24DE) - Nissan 240SX Performance Tuning )

this will show you the wiring pin numbers on the ecu connector. you will have to click on the left side to 1995 240sx as the pins are different on the 95 . then click on engine control system ec .

12-31-2012, 06:38 AM	#6
bad dog Leaky Injector Join Date: Dec 2010 Location: az Posts: 90 Trader Rating: (0)	i am no expert , but have you reset your ecu/ecm , if not do that 1st , manual or automatic tranny . the iat is the round plug close to the air filter , there are 2 there , one is the maf sensor , its the bigger of the two, the other is the iat sensor , its the round one . the iat sensor is a thermister meaning as the temp goes up the resistence of the sensor goes down , if you ohm it and measure resistance it shoud be about 2500 ohm at 68 degrees , just remove the connector at the sensor and measure the resistance of the sensor , if its open ( no resistance ) you could put a resistor across the 2 wires going to the ecu , use about 2100-2900 ohms , the ecu will think the iat sensor is ok. as far as the wiring to the ecm/ecu goes , the iat sensor 2 wires go to pins 63 and 50 of the ecu , if you have a automatic tranny the wire from pin 50 goes to pin 35 of the AT control unit ,this is the ground . google up (Manuals > USDM Cars > 1997 240SX (KA24DE) - Nissan 240SX Performance Tuning ) this will show you the wiring pin numbers on the ecu connector. you will have to click on the left side to 1995 240sx as the pins are different on the 95 . then click on engine control system ec .