RB25 Series 1 ECU Diagnosis Codes? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

wheresthaboost? · 02-13-2009, 10:17 AM

Anybody got a link to the codes? Tried googling it but couldnt find anything, skimmed over the fsm too but it only has consult codes i think.. Also which way do i turn the screw on the ecu for diagnosis mode? Thanks

Zacho · 02-13-2009, 05:29 PM

This is what my manual says:

11 Crankshaft position sensor
12 MAF sensor circuit (air flow meter)
13 Coolant temperature circuit
14 Vehicle speed sensor circuit
21 Ignition circuit
31 ECU (ouch!)
34 Knock sensor
43 Throttle position circuit
45 Injector leak
51 Ignition circuit
54 Auto signal to ECU
55 All OK

--->There are three different types of factory ECU available in Skylines.
One type has two LEDs and five modes
The second type has one LED and two modes
The last type has no LEDs, the output is done with the engine checklight in the instrument cluster. Acts as a single LED ECU.

1. Switch on the ignition, but don't start. The LED on the ECU will be glowing.

2. Turn the selector screw clockwise all the way (gently!)

3. For two LED ECU's: the LED will flash once, pause, flash twice, pause... all the way up to five. This is the diagnostic mode. Mode 1=one flash, mode 5=five flashes. When you reach the right mode, turn the screw back counter clockwise. Mode 3 is what most people use.

4. For single LED ECU's: wait a couple of seconds, and turn the screw back counter clockwise, the ECU is now in mode 2.

5.The engine check light on the dash will mirror the LED on the computer.

The LED will flash out a code(or series of codes if there is more than one fault) The ECU will keep error codes in memory for 50starts, so keep in mind if an error happened 51 starts ago, there will be no record of it in the ECU.
More recent ECU's have two LED's (red = first digit, green = second digit, for example, red 2x flash, green 1x flash = code 21)

The ECU's on most R32's have one LED, long flash = first digit, short flash =
second digit, for example, long, long, short = code 21.

Hope this helps!

wheresthaboost? · 02-13-2009, 06:14 PM

fucking awesome man! this should really be stickied some where because im sure im not the only person whose ever needed it and not been able to find it by searching.. thanks once again

02-13-2009, 10:17 AM	#1
wheresthaboost? Zilvia Member Join Date: Dec 2006 Location: Gulf Coast Posts: 156 Trader Rating: (0) Feedback Score: 0 reviews	RB25 Series 1 ECU Diagnosis Codes? Anybody got a link to the codes? Tried googling it but couldnt find anything, skimmed over the fsm too but it only has consult codes i think.. Also which way do i turn the screw on the ecu for diagnosis mode? Thanks __________________ RB25DET S13

02-13-2009, 06:14 PM	#3
wheresthaboost? Zilvia Member Join Date: Dec 2006 Location: Gulf Coast Posts: 156 Trader Rating: (0) Feedback Score: 0 reviews	fucking awesome man! this should really be stickied some where because im sure im not the only person whose ever needed it and not been able to find it by searching.. thanks once again __________________ RB25DET S13

02-13-2009, 05:29 PM	#2
Zacho Zilvia Member Join Date: Jun 2007 Location: Canada Posts: 217 Trader Rating: (5) Feedback Score: 5 reviews	This is what my manual says: 11 Crankshaft position sensor 12 MAF sensor circuit (air flow meter) 13 Coolant temperature circuit 14 Vehicle speed sensor circuit 21 Ignition circuit 31 ECU (ouch!) 34 Knock sensor 43 Throttle position circuit 45 Injector leak 51 Ignition circuit 54 Auto signal to ECU 55 All OK --->There are three different types of factory ECU available in Skylines. One type has two LEDs and five modes The second type has one LED and two modes The last type has no LEDs, the output is done with the engine checklight in the instrument cluster. Acts as a single LED ECU. 1. Switch on the ignition, but don't start. The LED on the ECU will be glowing. 2. Turn the selector screw clockwise all the way (gently!) 3. For two LED ECU's: the LED will flash once, pause, flash twice, pause... all the way up to five. This is the diagnostic mode. Mode 1=one flash, mode 5=five flashes. When you reach the right mode, turn the screw back counter clockwise. Mode 3 is what most people use. 4. For single LED ECU's: wait a couple of seconds, and turn the screw back counter clockwise, the ECU is now in mode 2. 5.The engine check light on the dash will mirror the LED on the computer. The LED will flash out a code(or series of codes if there is more than one fault) The ECU will keep error codes in memory for 50starts, so keep in mind if an error happened 51 starts ago, there will be no record of it in the ECU. More recent ECU's have two LED's (red = first digit, green = second digit, for example, red 2x flash, green 1x flash = code 21) The ECU's on most R32's have one LED, long flash = first digit, short flash = second digit, for example, long, long, short = code 21. Hope this helps!