Hey guys, I couldn't find a post with anyone sharing the RB25 ecu codes...so I thought I would post them up. These are straight out of the ecr33 manual.
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.
How to check codes:
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 you guys!