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91 Nissan 240 codes?


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10-08-04, 12:30 PM   #1  
smitty7
91 Nissan 240 codes?

I have 91 240 Nissan with a no start condition. Can some explain to me how to pull the codes. I'm really a dummy when it comes to auto electronics( and a whole lot of other things)

 
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10-08-04, 02:14 PM   #2  
Check for Codes:

Access the ECU from below the panel under the carpet on the passenger side floor board and look for the diode
Turn the ignition on DO NOT START
Confirm the Check Engine Lamp is on
Turn the diagnostic mode selector on the ECU fully clockwise for at least 2 seconds than turn selector fully counterclockwise The ECU is now in mode 2
watch the diode and note the code(s) [count the flashes]
Code 55 indicates all systems are ok

To clear codes:

Turn key on
Turn the diagnostic mode selector on the ECU fully clockwise for at least 2 seconds than turn selector fully counterclockwise (mode 2)
Turn the diagnostic mode selector on the ECU fully clockwise for at least 2 seconds than turn selector fully counterclockwise (now in Mode 1)
ECU memory is erased

Codes as follows:
11 --> crank sensor circuit
12 --> air flow meter circuit
13 --> Engine Temp sensor circuit
14 --> vehicle speed sensor circuit
21 --> ignition signal circuit
31--> ECU
32 --> EGR function
33 --> Exhaust gas circuit
34--> Detonation sensor circuit
35--> Exhaust gas temp sensor circuit
43 --> Throttle sensor circuit
45 --> injector leak
54 --> signal circuit from A/T control unit
55 --> No Malfunction

 
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10-08-04, 02:16 PM   #3  
Check for spark,fuel pressure,injector pulse and that the timing belt is not broken first.

 
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10-11-04, 11:19 AM   #4  
smitty7
Thanks for the help. I think it's the chain, just had a new one installed 2 yrs ago. I hear that it's real particular to install the guides properly. Anyway thanks again.

 
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