*INFO* Checking your Skyline for its ecu fault Codes

**TyeeImports** · 05-01-2005, 01:26 PM

Here is some info on checking your ecu for fault codes if you are having any problems with them.

This is for nissans from 1988-1994, altough i think its the same for 1994 models and up

The ECU is located on the passenger side, in the side panel beside your left foot when you are seated in the car.

ECCS has 5 modes :

Mode 1 - Exhaust Gas Sensor monitor.

When the engine is warm (closed loop) the green led turns on for lean, off for rich. It should alternate. When it is cold (open loop) it will be either on or off.

Mode 2 - Mixture ratio feedback control monitor.

During closed loop operation the red led should turn on and off simultaneously with the green led when the mixture is controlled within the specified values. During open loop the red led stays on or off.

Mode 3 - Self Diagnosis. See below

Mode 4 - Switches On/Off diagnosis.

The inspection lamp monitors the idle switch portion of the throttle valve switch, the starter switch, vehicle speed sensor an other switches with an on/off condition.

Mode 5 - Real Time diagnosis.

Same as Mode 3, but it flashes the errors as they occur.

To select the various modes :

http://tinypic.com/4t10dc

With the ignition ON take a small screwdriver and turn it clockwise. the LED's will flash together, first once, then pause, then twice, then pause, then three times. When this happens turn the screwdriver counter clockwise. The ECU is now in mode 3 which reads out the fault codes on the LED's. It will cycle through all stored fault codes.

Red LED = 10
Green = 1

If the red led flashes 4 times and the green one flashes 5 times that means you have code 45. It will repeat this if this is the only fault. If there are more faults it will flash all the faults and repeat.

The ECU will reset when you turn the ignition off.

11 - Crank Angle Sensor/Camshaft Position Sensor
12 - Air Flow Meter
13 - Engine Coolant Temperature Sensor
14 - Vehicle Speed Sensor
21 - Ignition Signal
22 - Fuel Pump
23 - Idle Switch
24 - Throttle Valve Switch
25 - Idle Speed Control Valve
26 - Boost Pressure Sensor
27 -
28 - Cooling Fan Circuit
29 -
30 -
31 - ECM
32 - EGR Function
33 - Heated Oxygen Sensor
34 - Knock Sensor
35 - Exhaust Gas Temperature Sensor
36 - EGR Control-Back Pressure Transducer
37 - Knock Sensor
38 - Right hand bank Closed Loop (B2)
41 - Intake Air Temperature Sensor
42 - Fuel Temperature Sensor
43 - Throttle Position Sensor
45 - Injector Leak
47 - Crankshaft Position Sensor
51 - Injector Circuit
53 - Oxygen Sensor
54 - A/T Control
55 - No Malfunction
63 - No. 6 Cylinder Misfire
64 - No. 5 Cylinder Misfire
65 - No. 4 Cylinder Misfire
66 - No. 3 Cylinder Misfire
67 - No. 2 Cylinder Misfire
68 - No. 1 Cylinder Misfire
71 - Random Misfire
72 - TWC Function right hand bank
76 - Fuel Injection System Function right hand bank
77 - Rear Heated Oxygen Sensor Circuit
82 - Crankshaft Position Sensor
84 - Automatic Transmission Diagnostic Communication Line
87 - Canister Control Solenoid Valve Circuit
91 - Front Heated Oxygen Sensor Heater Circuit right hand bank
94 - TCC Solenoid Valve
95 - Crank Position Cog
98 - Engine Coolant Temperature Sensor
101 - Front Heated Oxygen Sensor Heater Circuit right hand bank
103 - Park/Neutral Position Switch Circuit
105 - EGR and EGR Canister Control Solenoid Valve Circuit
108 - Canister Purge Control Valve Circuit
111 - Inhibitor Switch
112 - Automatic Transmission Speed Sensor
113 - Automatic Transmission 1st Signal
114 - Automatic Transmission 2nd Signal
115 - Automatic Transmission 3rd Signal
116 - Automatic Transmission 4th Signal
118 - Automatic Transmission Shift Solenoid Valve A
121 - Automatic Transmission Shift Solenoid Valve B
123 - Automatic Transmission Overrun Clutch Solenoid Valve
124 - Automatic Transmission TOR Conv Solenoid Valve
125 - Automatic Transmission Line Pressure Solenoid
126 - Automatic Transmission Throttle Position Sensor
127 - Automatic Transmission Engine Speed Signal
128 - Automatic Transmission Fluid Temperature Sensor

Thanks for looking,

www.TyeeImports.com

**Murphy** · 05-01-2005, 02:46 PM

Excellent info, thanks. Stickying 8)

**karbonphiber** · 07-30-2005, 10:03 AM

Where did you get this info from?
According to alldata, and personally having extract diagnostic trouble codes from the ECU on my gt-r, there is only 1 green LED and 2 operating modes- check engine lamp self test, and self-diagnostic mode.

The trouble codes are the same for all nissans i believe.

TheLine · 08-08-2007, 02:06 PM

i just took the kick panel off and exposed my ECU, and there is no LED that i can see on it. is it hiding somewhere around the area, or is it on the ECU itself?

**allmaking** · 08-08-2007, 07:12 PM

There is a small hole next to the diagnostic screw. In this hole you'll find the Leds.

**r33skyline24** · 11-24-2007, 08:08 PM

i have a 95 gtst and mines not under the right foot kick panel. i looked in the trunk where someone else said to look and on the top under by the speakers theres a metal type box that looks like it is the ecu but theres no markings on it. is this it?

**anthony** · 11-24-2007, 08:34 PM

Originally Posted by r33skyline24

i have a 95 gtst and mines not under the right foot kick panel. i looked in the trunk where someone else said to look and on the top under by the speakers theres a metal type box that looks like it is the ecu but theres no markings on it. is this it?

left foot panel passenger side, the one in the trunk is another controller