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​300zx ECU Codes

​Rather than removing the floorboard, it is possible to use a paperclip to jump two pins on the consult connector (located by the hood release pull) to enter diagnostics mode. For practical purposes, shorting these connectors is the same as turning the potentiometer on the ECU. Codes can be read from the Check Engine Light.
Picture
Located just above the Hood Release Pull.
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​This image shows which pins to short. Insert a jumper, hold for three seconds, and then remove it.

​The long flashes are the first digit, and the short flashes are the second digit.
Look at the following list to determine the code(s).

11: crank angle sensor circuit 
12*: air flow meter circuit 
13*: engine coolant temp. Sensor circuit 
14*: vehicle speed sensor circuit 
21: ignition signal circuit 
26*: boost pressure sensor 
31*: ECU 
32*: EGR function 
33*: exhaust gas sensor circuit (left) 
34: detonation sensor circuit 
35*: exhaust gas temp. Sensor circuit 
42: fuel temp. Sensor circuit 
43*: throttle position sensor circuit 
45*: injector leak 
51*: injector circuit 
53*: exhaust gas sensor circuit (right) 
54: signal circuit from A/T control to ECU 
55: NO malfunctions in the above 

* indicates that the "Check Engine" light will come on under normal driving.
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