DTC/CEL/MIL/OBD Codes and How To Retrieve Them - Nissan 240SX Forums
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#1 Old 01-12-2009, 06:42 PM
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DTC/CEL/MIL/OBD Codes and How To Retrieve Them

According to my Research this applies to boh the KA and SR

How to Retrieve your Codes:

1. Remove the Passenger Kick Panel
2. Remove the Bolt Holding down the ECU
3. On the Back of the ECU there should be an Red/Green LED w/ a Screw/Pot type thing where Flathead Screwdriver fits. Turn it completley Counter-Clockwise *Do not force it when it stops it stops, thats it*



4. Turn the Ign. to the On Position
5. One of Two things will happen. Either your CEL (Check Engine Light) will begin Flashing, or Your entire Gauge Cluster will begin Flashing. The Flashing is giving you the Codes in Numbers by How many times the light Flashes
6. Flashing is Read in this manner:
Long Flash - 0.6 seconds on (the first digit)
Short Flash - 0.3 seconds on (the second digit)
Long Gap - 2.1 seconds off (used between codes)
Short Gap - 0.9 seconds off (used between digits)

There are two digits in each code. Count the long flashes, then the short flashes (only count how many times the light is ON) and you'll have a 2 digit code. These codes are covered in the service manual.

If the only code you get is 55, There is nothing wrong...

7. Once you have retived all the codes, it will just loop and keep flashing the codes over and over again. Turn the Car off, and turn the Screw/Knob all the back Clockwise
8. Reinstall ECU and Kick Panel
9. Voila, your done!



Code
Detected Items
Malfunction is detected when ...
Check Items (Possible Cause)


11
Camshaft position sensor circuit
- Either 1 degree or 180 degrees signal is not detected by the EDM for the first few seconds during the engine cranking- Either 1 degree or 180 degrees signal is not detected by the ECM often enough while the engine speed is higher than the specified rpm
- The relation between 1 degree and 180 degree signals is not in the normal range during the specified rpm
- Harness or connectors (The sensor circuit is open or shorted.)
- Camshaft position sensor
- Starer motor
- Starting system circuit (EL selection)- Dead (Weak) battery

12
Mass air flow sensor circuit
- An excessively high or low voltage is entered to ECM
- Voltage sent to ECM is not practical when compared with the camshaft position sensor signal and throttle position sensor signals.
- Harness or connectors (The sensor circuit is opened or shorted.)
- Mass air flow sensor

13
Engine coolant temperature sensor circuit
- An excessively high or low voltage from the sensor is detected by the ECM
- Harness or connectors (The sensor circuit is opened or shorted.)
- Engine coolant temperature sensor

14
Vehicle speed sensor circuit
- The almost 0 MPH signal from the sensor is detected by the ECM even when vehicle is driving
-Harness or connectors (The sensor circuit is open or shorted.)
- Vehicle speed sensor

21
Ignition signal circuit
-The ignition signal in the primary circuit is not detected by the ECM during engine cranking or running.
-Harness or connectors (The ignition primary circuit is open or shorted.)
- Power transistor unit- Camshaft position sensor
- Camshaft position sensor circuit

25
Idle speed control function
-The idle speed control function does not operate properly.
- Harness or connectors (The valve circuit it shorted.)
- IACV
-AAC valve
- Harness or connectors (The valve circuit is open.)

28
Cooling fan circuit
- Cooling fan does not operate properly. (Overheat)
- Cooling system does not operate properly. (Overheat)
- Engine coolant was not added to the system using the proper filling method.
- Harness or connectors. (The cooling fan circuit is open or shorted.)
- Cooling fan
- Radiator hose
- Radiator
- Radiator cap
- Water pump
- Thermostat

31
ECM
- ECM calculation function is malfunctioning
- ECM (ECCS control module)

32
- EGR function
- The EGR flow is excessively low or high during the specified driveing condition.
- EGR valve stuck closed, open, or leaking- Passage obstructed
- EGR and canister control solenoid valve
- Tube leaking for EGR valve vacuum
- EGRC-BPT valve leaking

33
Front ocygen sensor circuit
- An excessively high voltage from the sensor is detected by the ECM
- The voltage from the sensor is constantly approx. 0.3V.
- The specified maximum and minimum voltages from the sensor are not reached.
- It takes more than the specified time for the sensor to respond between rich and lean.
- Harness or connectors (The sensor circuit is open or shorted.)
- Front oxygen sensor- Injectors
- Intake air leaks- Fuel pressure

34
Knock sensor circuit
- An excessively low or high voltage from the sensor is detected by the ECM.
- Harness or connectors (The sensor circuit is open or shorted.)
- Knock Sensor

35
EGR temperature sensor circuit
- An excessively low or high voltage from the sensor is defected by the ECM, evn when engine coolant temperature is low or high.
- Harness or connectors (The sensor circuit is open or shorted.)
- EGR temperature sensor

36
EGRC-BPT valve function
- EGRC-BPT valve does not operate properly
- EGRC-BPT valve- Rubber tube (obstructed or misconnected)

37
Closed loop control
- The closed loop control function does not operate even when vehicle is driving in the specified condition.
- The front oxygen sensor circuit is open or shorted.- Front oxygen sensor

41
Intake air temperature sensor circuit
- An excessively low or high voltage from the sensor is detected by the ECM.
- Voltage sent to ECM is not practical when compared with the engine coolant temerature sensor signal.
- Harness or connectors (The sensor circuit is open or shorted)
- Intake air temperature sensor

43
Throttle position sensor circuit
- An excessively low or high voltage from the sensor is detected by the ECM.
- Voltage sent to ECM is not practical when compared with the mass air flow sensor and camshaft position sensor signals.
- Harness or connectors (The sensor circuit is open or shorted.)
- Throttle position sensor

55
No failure
- No malfunction related to OBD system is detected by either ECM or A/T control unit.
- No failure

65
No. 4 cylinder misfire
- (Three-way catalyst damage) The misfire occurs, which will damage three way catalyst by overheating.
- (Exhaust quality deterioration) The misfire occurs, which will not damage three way catalyst but will affect emission deterioration.
- Improper spark plug
- The ignition secondary circuit is open or shorted.
- Insufficient compression
- Incorrect fuel pressure
- EGR valve
- The injector circuit is open or shorted.
- Injectors
- Lack of fuel
- Magnetized flywheel (drive plate)

66
No. 3 cylinder misfire
see above
see above

67
No. 2 cylinder misfire
see above
see above

68
No. 1 cylinder misfire
see above
see above

71
Multiple cylinder misfire
see above
see above

72
Three way catalyst function
- Three way catalyst does not operate properly.
- Three way catalyst does not have enogh oxygen storage capacity.
- Three way catalyst
- Exhaust tube
- Intake air leak
- Injectors- Injector Leak

76
Fuel injection system function
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is excessive (The mixture ratio is too lean or too rich.)
- Intake air leak
- Front oxygen sensor
- Injectors
- Exhaust gas leak
- Incorrect fuel pressure
- Mass air flor sensor
- Lack of fuel

77
Rear heated oxygen sensor circuit
- An excessively high voltage from the sensor is detected by the ECM.
- The specified maximum and minimum voltages from the sensor are not reached.
- It takes more than the specified time for the sensor to respond between rich and lean
- Harness or connectors (The sensor circuit is open or shorted.)
- Rear heated oxygen sensor
- Fuel pressure
- Injectors
- Intake air leaks

82
Crankshaft position sensor (OBD) circuit
- The proper pulse signal from the sensor is not detected by the ECM while the engine is running at the specified rpm.
- Harness or connectors (The sensor circuit is open or shorted.)
- Rear heated oxygen sensor
- Fuel pressure
- Injectors
- Intake air leaks

84
A/T diagnosis communication line
- An incorrect signal from A/T control unit is detected by the ECM.
- Harness or connectors (The communication line circuit is open or shorted.
- Dead (Weak) battery
- A/T control unit

95
Crankshaft position sensor (OBD)
- The chipping of the flywheel or drive plate gear tooth is detected by the ECM
- Harness or connectors
- Crankshaft position sensor (OBD)
- Flywheel

98
Engine coolant temperature sensor function
- Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine
- Engine coolant temperature is insufficient for closed loop fuel control
- Harness or connectors (The swith circuit is open or shorted)
- Neutral position switch
- Inhibitor switch

103
Park/Neutral position switch circuit
- The signal of the park/neutral position switch is not changed in the process of engine starting and driving.
- Harness or connectors (The valve circuit is open or shorted)
- EGR and canister control solenoid valve

-
Signal circuit from A/T control unit to ECM
- ECM recieves incorrect voltage from A/T control unit continuously
- Harness or connectors (The circuit between ECM and A/T control unit is open or shorted)

111
Inhibitor switch circuit
-A/T control unit does not recieve the correct voltage signal from the switch based on the gear position.
- Harness or connectors (The switch circuit is open or shorted)
- Inhibitor switch

112
Revolution sensor
- A/T control unit does not recieve the proper voltage signal from the sensor
- Harness or connectors (The switch circuit is open or shorted)
- Revolution sensor

113
Improper shifting to 1st gear position
- A/T can not be shifted to the 1st gear position even electrical circuit is good
- Shift solenoid valve A
- Shift solenoid valve B
- Overrun clutch solenoid valve
- Line pressure solenoid valve
- Each clutch
- Hydraulic control circuit

114
Improper shifting to 2nd gear position
- A/T can not be shifted to the 2nd gear position even electrical circuit is good
see above

115
Improper shifting to 3rd gear position
- A/T can not be shifted to the 3rd gear position even electrical circuit is good
see above

116
Improper shifting to 4th gear position or TCC
- A/T can not be shifted to the 4th gear position or perform lock-up even electrical circuit is good
T/C clutch solenoid valve

118
Shift solenoid valve A
- A/T control unit detects the improprt voltage drop when it tries to operate the solenoid valve
- Harness or connectors (The switch circuit is open or shorted)

121
Shift solenoid valve B
- A/T control unit detects the improprt voltage drop when it tries to operate the solenoid valve
- Harness or connectors (The switch circuit is open or shorted)
- Shift solenoid valve A

123
Overrun clutch solenoid valve
- A/T control unit detects the improprt voltage drop when it tries to operate the solenoid valve
- Harness or connectors (The switch circuit is open or shorted)
- Shift solenoid valve B
- Overrun clutch solenoid valve

124
T/C clutch solenoid valve
- A/T control unit detects the improprt voltage drop when it tries to operate the solenoid valve
- Harness or connectors (The switch circuit is open or shorted)
- T/C clutch solenoid valve

125
Line pressure solenoid valve
- A/T control unit detects the improprt voltage drop when it tries to operate the solenoid valve
- Harness or connectors (The switch circuit is open or shorted)
- Line pressure solenoid valve

126
Throttle position sensor
- A/T control unit recieves an excessively low or high voltage signal from the sensor
- Harness or connectors (The switch circuit is open or shorted)
- Throttle position sensor

127
Engine speed signal
- A/T control unit does not recieve the proper voltage signal from the ECM
- Harness or connectors (The switch circuit is open or shorted)

128
Fluid temperature sensor
- A/T control unit recieves an excessively low or high voltage signal from the sensor
- Harness or connectors (The switch circuit is open or shorted)
- Fluid temperature sensor



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Last edited by Scoot; 01-17-2009 at 07:35 PM.
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