Consult
Consult plug showing pins to connect for diagnosticsUsed on Nissans from 1989 until around 1998. (Note USA changed much earlier than this) 14 pin grey plastic plug in fuse box area below & to the right of the steering wheel.
[edit] Reading Fault codes
Turn the ignition key to the ON position but do not start. Orange "Check engine" light will illuminate along with oil pressure light etc.
To access error code retrieval mode use a small piece of wire, e.g. paperclip, to connect the bottom left two pins for approximately 2 seconds.
Disconnect wire.
After approximately 2 seconds "Check engine" light will start flashing fault codes. Long flashes are tens, short flashes are ones, e.g. 5 long flashes followed by 5 short flashes is code 55 = normal.
To check O2 sensor, start engine. Light ON=rich, OFF=lean.
Check that the check engine light blinks more than 5 times every 10 seconds at 2000 rpm in neutral when warm.
Alternative way for getting the fault code(s).
Take the kick panel off the centre tunnel beside your clutch foot & on the other side. You'll see your computer in the middle. Unbolt the computer from the car, there'll be enough cable to get it out the passenger side. Take the top off so you can see the 'diagnostic mode selector' trimpot rather than trying to turn it through the access hole. Turn the ignition switch on, but do not start the engine. Turn the pot fully clockwise. Wait at least 2 seconds, then turn pot fully counter clock-wise. The ECU is now in Diagnostics MODE II Read the codes flashing from the check engine light. Long flash is first digit, short flash is 2nd digit, see the codes below. To exit MODE II, turn pot fully clock-wise. Wait at least 2 seconds, then turn the potentiometer fully counter clock-wise, or... Start engine with the ECU in MODE II to enter MODE II - Heated Oxygen Sensor (O2) Monitor . The ECU is now monitoring the O2 sensor. Warm the engine to normal operating temperature, then run at 2000 rpm for 2 minutes. Check that the check engine light blinks more than 5 times every 10 seconds at 2000 rpm. NOTE: Light indicates signal from sensor to ecu. ON=rich, Off=lean. Blinking light means system is constantly adjusting between lean and rich which is normal. Any other indication would be abnormal and require further investigation. The switched on/off is 'closed loop', while a constant on or off is 'open loop' 11. To exit MODE II - Heated Oxygen Sensor Monitor, turn the potentiometer fully counter clock-wise and stop the engine.
[edit] Codes
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
Trouble Code: Detected Items: Malfunction Caused By: Check::
11* Camshaft Angle Sensor circuit (CAS) Either 1° or 120° signal is not entered for the first few seconds of engine cranking. Either 1° or 120° signal is not input often enough while the engine speed is higher then the specified RPM. Harness and connector (if harness and connector are OK, CAS might be bad)
12 Mass Air-Flow Sensor circuit (MAS) The MAS sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector (if harness and connector are OK, MAS might be bad)
13 Engine Coolant Temp. Sensor The Engine Coolant Temp. Sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector Engine Coolant Temp. Sensor
14 Speed Sensor circuit The Speed Sensor circuit is open or shorted. Harness and connector Speed Sensor switch (reed switch)
21* Ignition signal circuit The ignition signal in the primary circuit is not entered during engine cranking or running. Harness and connector Power Transistor Unit
26 Boost Pressure sensor (Turbo models) The boost pressure sensor is open or shorted (abnormally high or low voltage is registered). Harness and connector Boost pressure leaks Boost pressure sensor
31 ECU ECU calculation function is failing Replace ECU
32 EGR function EGR valve does not operate (valve spring does not lift) EGR valve EGRC-solenoid valve
33 O2 Sensor (left side) The O2 Sensor is open or shorted (abnormally high or low voltage is registered). Harness and connector O2 sensor Fuel pressure Injectors Intake air leaks
34 Detonation Sensor circuit The detonation sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector Detonation sensor
35 EGR Temp. Sensor The EGR Temp. Sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector EGR temp. sensor
42 Fuel Temp Sensor circuit The Fuel Temp. Sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector Fuel temp. sensor
43 Throttle Position Sensor circuit The Throttle Position Sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector Throttle position sensor
45 Injector leak Fuel leaks from the injectors Injectors
51 Injector circuit The injector circuit is open Harness and connector Injectors
53 O2 Sensor (right side) The O2 Sensor is open or shorted (abnormally high or low voltage is registered). Harness and connector O2 sensor Fuel pressure Injectors Intake air leaks
54 Signal circuit from the automatic transmission (A/T) (A/T models only)
[edit] Consult II / OBDII / NATS
Used on Nissans from around 1999 on (earlier in USA)
16 pin plug, each side of plug has a taper making the bottom longer than the top.
[edit] Reading Fault codes
Turn ignition key to the ON position & do not start the car.
Connect bottom left & bottom right pins of plug with a short piece of wire, e.g. paperclip
Disconnect after about 2 seconds.
This is how you reset the check engine light. No tools required!
In car ECM Diagnostics/ECM Reset procedure:
1) Sit in the driver's seat.
2) Turn the ignition key to the ON position and wait three seconds. (Do not start the car.)
3) Fully depress and release the accelerator pedal five times in less than five seconds.
4) Wait exactly seven seconds. Fully depress the accelerator pedal for ten seconds until the MIL light flashes.
5) Release the accelerator pedal and start counting flashes to obtain the four-digit trouble code.
Long flashes (0.6 seconds) indicate the first digit of the code; count the blinks one through nine and write down the first digit. (Ten blinks indicates a zero.) The next three digits follow in turn in the same fashion except with faster blinks (0.3 second) and a 1.0-second pause between digits.
The ECM code repeats intself until you turn the ignition key to the OFF position, at which point the ECM resets itself to standard get-in-and-drive-the-car mode. You can look up the trouble codes in the ESM/FSM; there's a bunch of them. In the ESM, refer to page EC-639. Additionally, if you get four blinks of ten (0000), the ECM is indicating no malfunction.
You can clear the code (and the annoying MIL) by holding down the accelerator pedal for more than 10 seconds while in Diagnostic Test Mode II. When you release the pedal, the ECM erases the trouble code(s).
[edit] Codes
0000 NO SELF DIAGNOSTIC FAILURE INDICATED
0100 MAF SEN/CIRCUIT
0110 AIR TEMP SEN/CIRC
0115 COOLANT T SEN/CIRC
0120 THRTL POS SEN/CIRC
0130 FRONT O2 SENSOR
0131 FRONT O2 SENSOR
0132 FRONT O2 SENSOR
0133 FRONT O2 SENSOR
0134 FRONT O2 SENSOR
0135 FR O2 SE HEATER
0137 REAR O2 SENSOR
0138 REAR O2 SENSOR
0139 REAR O2 SENSOR
0140 REAR O2 SENSOR
0141 RR O2 SE HEATER
0171 FUEL SYS-LEAN/BK1
0172 FUEL SYS-RICH/BK1
0180 FUEL TEMP SEN/CIRC
0300 MULTI CYL MISFIRE
0301 CYL 1 MISFIRE
0302 CYL 2 MISFIRE
0303 CYL 3 MISFIRE
0304 CYL 4 MISFIRE
0325 KNOCK SEN/CIRC
0335 CPS/CIRCUIT (POS)
0340 CAM POS SEN/CIRC
0400 EGR SYSTEM
0403 EGR VOL CON/V CIR
0420 TW CATALYST SYS
0443 PURG VOLUME CONT
0500 VEH SPEED SEN/CIRC
0505 IACV/AAC VLV/CIRC
0510 CLOSED TP SW/CIRC
0605 ECM
1111 INT/V TIM V/CIR
1131 SWIRL CONT SOL/V
1217 ENG OVER TEMP
1401 EGR TEMP SEN/CIRC
1402 EGR SYSTEM
1610-1615 NATS MALFUNCTION
1706 P-N POS SW/CIRCUIT
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