Nissan / Datsun Pickup:

Computer has a green and red light showing

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# 1  12/17/2011 2:48 AM

mikes86
New member
Registered: 12/17/2011
Posts: 1

Computer has a green and red light showing

I have a 1986 Nissan Pick Up with a 4 cyl. Z24 engine, the engine died, towed it home. 

Traced one problem to a burnt fusible link, fixed that but the engine still wouldn't start. It's getting gas to the

fuel filter but not to the injector. Took the top of the injector off  the wires looked good.  The only thing we could

think that it might be is the main computer. Looked at the computer in the window on the side it has

a green and red light showing. What does the green and red light mean?

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# 2  12/17/2011 5:01 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1299

Re: Computer has a green and red light showing

The red and green lights are for diagnostics. I have listed a portion of the diagnostics from  the Alldata information website. You can get more information for this at ALLDATAdiy.com.

The self-diagnostic system identifies malfunctions of signal systems such as sensors, actuators and wire harnesses based on the input signals received by the ECCS control unit. Various malfunctions are coded and displayed on the control unit by a series of blinking red and green lights. Results of the self-diagnosis are retained in the control unit's memory and are displayed when the mode selector, located on the rear of the control unit is switched to the On position. When displaying malfunction codes, the code number can be determined by counting the number of light pulses. The red light represents the first digit of the code, while the green light represents the second digit of the code. For example, a Code 32, would be displayed as three flashes of the red light, followed by two flashes of the green light. Malfunction codes can be translated as follows:
a.    Code 11 -- Crank angle sensor circuit malfunction.
b.    Code 12 -- Air flow meter malfunction.
c.    Code 13 -- Water temperature sensor circuit malfunction.
d.    Code 21 -- Ignition signal malfunction.
e.    Code 23 -- Idle switch circuit malfunction.
f.    Code 24 -- Transmission switch and clutch switch circuit malfunction.
g.    Code 32 -- Starter signal malfunction.
h.    Code 42 -- Throttle sensor circuit malfunction.
i.    Code 43 -- Injector circuit malfunction.
j.    Code 44 -- All monitored systems satisfactory.


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