How To Check Your ECU Error Codes - Nissan Forum
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post #1 of 15 Old Feb 20th, 2003, 07:34 PM Thread Starter
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How To Check Your ECU Error Codes

HOW TO CHECK YOUR ECU ERROR CODES: NPORA post complete with pics.

This applies to 1987-1995 Pathfinder and HB pickup only.

Patrick Scott
Yeah, thats a roll cage in there.
I shall call him...Mini-Me

Last edited by 88pathoffroad; Feb 27th, 2007 at 11:31 PM. Reason: Thread is full of off-topic posts and misc crap, previous title wasn't very helpful, considering the content of the thread
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post #2 of 15 Old Mar 5th, 2003, 12:14 PM
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I would like to sticky this info on self diagnostics for 91-95 Hardbody/ Pathfinder. This should work with other years/ models Nissan vehicles, but I'm not positive. Do this at you're own risk:

This procedure (more complete version) is also available at: http://npora.ipbhost.com//index.php?showtopic=21 Thanks. -88pathoffroad

Mode I - Exhaust Oxygen Sensor Monitor

Use Mode I to determine if the Oxygen Sensor is functioning properly.

Warm the engine to normal temperature.
Run the engine above 2000 RPM under no load while looking at the ECU.
Make sure the GREEN LED goes on and off more than five times during ten seconds at 2000 RPM.
If the number of flashes are not more than five, replace the oxygen sensor. If the LED does not flash, check the sensor's circuit.


Mode II - Mixture Ratio Control Monitor
Use Mode II to determine if the air/fuel mixture is cycling correctly.
Warm the engine to normal operating temperature.
Turn the dial on the ECU fully clockwise (or if you have a switch, turn it on).
After the LED flashes twice, turn the dial fully counter clockwise (or turn the switch off).
Run the engine above 2000 RPM under no load while looking at the ECU.
If the RED LED blinks simultaneously with the GREEN LED, the air/fuel mixture is cycling properly.
If the RED LED stays off, the mixture is more than 5% rich.
If the RED LED stays on, the mixture is more than 5% lean.
If the RED LED stays on or off above 2000 RPM, complete the diagnostics before beginning repairs.

Mode III - Stored Fault Code Reporting
Use Mode III to retrive all stored trouble codes in memory.
Turn the ignition switch on, but do not start the engine.
On the ECU, turn the diagnostic mode selector screw fully clockwise (or if you have a switch, turn it on). Wait until the LED flashes 3 quick bursts, then turn the screw fully counter clockwise (or turn the switch off).
The check engine light will begin to flash trouble codes. Red flashes are units of ten and green flashes are units of one. (red-3 flashes, green-1 flash = code 31) Note all codes until it begins to loop.
To clear all stored codes, turn the screw fully clockwise (or turn the switch on). Wait until the LED flashes 4 quick bursts, then turn the screw fully counter clockwise (or turn the switch off). To retain the codes in memory, simply turn the ignition off.

KA24E Codes:
11 Crankshaft Position Sensor Circuit
12 Mass Air Flow Sensor Circuit
13 Engine Coolant Temperature Sensor Circuit
14 Vehicle Speed Sensor Circuit
21 Ignition Signal Missing in Primary Coil
31 Engine Control Unit (ECU)
33 Oxygen Sensor Circuit
41 Air Temperature Sensor Circuit
43 Throttle Position Sensor Circuit
55 No Malfunctions

Complete list of Codes for other models:
11 Crank Angle Sensor/Camshaft Position Sensor
12 Air Flow Meter/Mass Air Flow Sensor
13 Engine Coolant Temperature Sensor
14 Vehicle Speed Sensor
21 Ignition Signal
22 Fuel Pump
23 Idle Switch
24 Throttle Valve Switch
25 Idle Speed Control Valve
28 Cooling Fan Circuit
31 ECU
32 EGR Function
33 Heated Oxygen Sensor
34 Knock Sensor
35 Exhaust Gas Temperature Sensor
36 EGR Control-Back Pressure Transducer
37 Knock Sensor
38 Right hand bank Closed Loop (B2)
41 Intake Air Temperature Sensor
42 Fuel Temperature Sensor
43 Throttle Position Sensor
45 Injector Leak
47 Crankshaft Position Sensor
51 Injector Circuit
53 Oxygen Sensor
54 A/T Control
55 No Malfunction
63 No. 6 Cylinder Misfire
64 No. 5 Cylinder Misfire
65 No. 4 Cylinder Misfire
66 No. 3 Cylinder Misfire
67 No. 2 Cylinder Misfire
68 No. 1 Cylinder Misfire
71 Random Misfire
72 TWC Function right hand bank
73 TWC Function right hand bank
76 Fuel Injection System Function right hand bank
77 Rear Heated Oxygen Sensor Circuit
82 Crankshaft Position Sensor
84 A/T Diagnosis Communication Line
85 VTC Solenoid Valve Circuit
86 Fuel Injection System Function right hand bank
87 Canister Control Solenoid Valve Circuit
91 Front Heated Oxygen Sensor Heater Circuit right hand bank
94 TCC Solenoid Valve
95 Crankshaft Position Sensor
98 Engine Coolant Temperature Sensor
101 Front Heated Oxygen Sensor Heater Circuit right hand bank
103 Park/Neutral Position Switch Circuit
105 EGR and EGR Canister Control Solenoid Valve Circuit
108 Canister Purge Control Valve Circuit

Check or replace the sensor(s) and related components corresponding the list of stores trouble codes.

Mode IV - Switch Operation Monitor
Use Mode IV to determine if the Throttle Position Sensor (TPS), Starter circuit and/or Vehicle Speed Sensor (VSS) are in proper working order.
Turn the ignition switch on, but do not start the engine.
Turn the dial on the ECU fully clockwise. After the LED flashes 4 times, turn the dial fully counter clockwise.
Make sure the RED LED is turned off.
Make sure the RED LED turns on when depressing the gas pedal. If not, check or replace the Throttle Position Sensor.
Make sure the RED LED turns on when turning the ignition key the START position. If not, check or replace the starter.
Drive the vehicle with the ECU unbolted and within view. Make sure the GREEN LED turns on when speed is 12 MPH or more. If not, check or replace the Vehicle Speed Sensor.

Mode V - Real Time Diagnostic Function
Use Mode V to determine if the Crankshaft Position Sensor (CPS), Mass Air Flow (MAF) sensor and/or Ignition signal are working properly.

Start engine.
Turn the dial on the ECU fully clockwise.
After the LED flashes 5 times, turn the dial fully counter clockwise.
Make sure LEDs do not flash for 5 minutes when racing or idling the engine.
If it flashes, count the number of flashes, turn engine off, and see the following 3 paragraphs.
Perform real-time diagnosis insepction and repair or replace malfunctioning part if present.
If LEDs do not flash for 5 minutes, turn engine off.

If the RED LED flashes 3 times for 1.5 seconds, check the Crankshaft Position Sensor. Check the harness continuity at CPS when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes twice-3 times for 0.5 seconds, check Mass Air Flow Sensor. Check the harness continuity at MAF when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes 4 times for 0.2 seconds 3 times, check the ignition signal. Check the harness continuity when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

95 WD-21 DVD/TV system-otherwise stock kid hauler
95 D-21 KC XE 3" lift- built for rockcrawlin!

Last edited by 88pathoffroad; Aug 12th, 2006 at 07:02 PM. Reason: Cleaned up excessive <br>'s and streamlined the post
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post #3 of 15 Old Mar 23rd, 2003, 12:01 PM
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Thumbs up Nissan Speedo Prob Solved

Here is a post I placed on another board regarding Nissan PU speedos. I thought it may be useful.

If you look into your speedo setup, you will find it is a digital unit with an analog sweep rather than a cable driven analog. To troubleshoot these is a little difficult and usually results in "swaptronics". The items in the speedo system are a sensor in tranny or transfer case, two wires from sensor to head unit(what you see), head unit, and one reference wire that goes to the ECU (sets off check engine light). Mounting screws that hold the speedo in place in the instrument cluster make the connection from the printed circuit to the head unit. Now all said, to troubleshoot:
1. Replace the Vehicle Speed sensor in the trannny/transfercase. Try it.
2. Inspect printed circuit and ensure continuity through printed circuit by testing between plastic push in connectors and speedo mounting screws with connectors installed (speedo and sensor disconnected). It may help to map this out with different colored markers. You will find that the four screws on the back are for 12v+, Ground, Ecu, and reference from sensor. The other sensor wire is connected toground via the printed circuit.
3. Shoot the wires to the sensor from the head unit for continuity with the sensor disconnected. Also run a continuity check between wires to make sure they aren't melted together.
4. Check for 12v and ground to speedo head unit
5. If all else tests good, replace head unit. Most places can get you one for about 200 dollars (they don't exist on the used market). Prices flex a little, but as all remanufactured Nissan speedos come from the same place, don't expect to find anyone selling them cheaper than anyone else.
6. Here is the kicker. Speedos from other models will work! I got a speedo from a 93 Sentra for 5 bucks and installed it in my 95 PU. You will find that if the screws that mount the back of the speedo are the same, it will fit. And if you look on the bottom of the speedo face it will say something like 60mph=1024 rpm. If the other speedo has the same markings it will read true. The only problem is you have to use the face from the new speedo if the speedos read different maximum speeds. It may require trimming and you may have to remove the needle, but this is pretty easy.
The needle may be tight but it pulls straight off. Before doing this make sure you twist the speedo in the clockwise direction till it meets the stop. Then mark this point and be sure that when you reinstall it, it twists to the same maximum as before. This can be a little tricky, but when done carefully is usually quite accurate. This is a neat liitle mod to do for a tricked out ride. The downside is that you now have a TMU(True Miles Unknown) vehicle. This kills resale value. I think I have the only Nissan Pickup anywhere that reads true all the way to 130 mph. Never been that fast, but now I will know when I have!!! Good Luck Aaron Ford

I am editting due to finding a better way to ensure the needle is correct. Instead of turning the needle to it's max, simply lift the needle over the zero peg and let it fall to rest. Then assemble the new one with the needle in the same place. Then lift the needle back over the peg. Much easier. AF

87-90 speedometers are indeed cable-driven, NOT electronic, just so you know. I don't know the cut-off year for the electronic speedo setup, but it's likely that it may have been as late as 1992. Thanks. -88pathoffroad

Last edited by 88pathoffroad; Feb 5th, 2005 at 09:47 PM. Reason: Additional info inserted at bottom of post to make things a bit clearer
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post #4 of 15 Old Mar 19th, 2004, 10:15 PM
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Quote:
Originally Posted by Tolleyy
I would like too sticky this info on self diagnostics for 91-95 Hardbody/ Pathfinder. This should work with other years/ models Nissan vehicles, but I'm not positive. Do this at you're own risk:
Do you have any info on 97 pickup, it has no flashing lights. just the diag screw, also the code numbers are different, of course all I have to go on is a haynes manuel (sucks)

Last edited by Scott; Sep 18th, 2004 at 11:24 AM. Reason: Huge quote trimmed
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post #5 of 15 Old May 10th, 2004, 10:43 AM
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where are all of these screws and lights located? and what do u use to check these lights?
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post #6 of 15 Old Jun 17th, 2004, 08:28 AM
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Exclamation light screw

Quote:
Originally Posted by uncnissan2004
where are all of these screws and lights located? and what do u use to check these lights?
Pathfinders up to 1999 have the ecm under the front passenger seat. You access it from behind the seat, push the seat all the way forward. The flat head screw is on the left side of the ecm.

From 1996 on they switched to the OBD II system. So you can use a scan tool to access the codes. The connector is located at lower edge of instrument panel near steering column.
NOTE: 96 - 99 ecu's have different mode states:
1. (Mode I): with engine stopped, system in bulb check state. with engine running, system in malfunction warning state.
2. (Mode II): with engine stopped, system in self diagnostic results state. with engine running, system in front O2S monitor state.

Clearing Codes:
On pre-96 models, MIL stored memory will be erased after selecting Mode III or Mode IV or by disconnecting the battery.

On 96–99 models, MIL stored memory will be erased by switching from Mode II to Mode I.

On 96–04 models, to erase DTCs using a scan tool, select ERASE CODES.

You can find a cheap scanner on ebay or at a parts store. Be sure the one you get can erase codes. Or you can buy software that you run from your computer, laptop or PDA using a $25 connector. Autotap is the best and I believe they offer a free download.

Heres a link to all the OBD II software available


http://www.troublecodes.net/technical/scaninfo.shtml

Fixed applicable model 1995-1996 year info, thank you for the original post. Good info. -88pathoffroad

Last edited by 88pathoffroad; Feb 5th, 2005 at 09:51 PM. Reason: Years mentioned in this post were incorrect, info should be accurate in order to help everyone, yes-no?
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post #7 of 15 Old Feb 25th, 2005, 11:55 AM
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95 PATHFINDER ECU CODE

Quote:
Originally Posted by PatScottAKA99XE
If anybody need help, has a question, or wants to report something in this section hit me up any time.
patricks@ncia.net
AIM: PatScottAKA99XE and PatScottAKA99XE2

This means "Please feel free to Private Message me." Please do not post here with any more miscellaneous questions you may have. Start a new thread in the appropriate forum with your question. Thank you. -88pathoffroad


HI PAT, THE ENGINE LIGHT CODE GIVES ME A 2 FLASH, 3, 4 AND 5 FOR MY 95 PATHFINDER.
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post #8 of 15 Old Feb 26th, 2005, 12:35 AM
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1. Please turn off your caps lock.
2. And? Were you going to ask a question?
3. Your codes are covered above, if you take the time to read the post.

Thank you, next!

Owner of NPORA, mod for Nissan-Infiniti Forums, NissanForums.com, NissanHelp.com, AllNissans.com and VGPowered Forums
'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
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post #9 of 15 Old Sep 6th, 2007, 04:52 PM
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Quote:
Originally Posted by Tolleyy
I would like to sticky this info on self diagnostics for 91-95 Hardbody/ Pathfinder. This should work with other years/ models Nissan vehicles, but I'm not positive. Do this at you're own risk:

This procedure (more complete version) is also available at: Ecu Self-diagnostics For 87-95 Pathfinder - Nissan Pathfinder Off-Road Association Thanks. -88pathoffroad

Mode I - Exhaust Oxygen Sensor Monitor

Use Mode I to determine if the Oxygen Sensor is functioning properly.

Warm the engine to normal temperature.
Run the engine above 2000 RPM under no load while looking at the ECU.
Make sure the GREEN LED goes on and off more than five times during ten seconds at 2000 RPM.
If the number of flashes are not more than five, replace the oxygen sensor. If the LED does not flash, check the sensor's circuit.


Mode II - Mixture Ratio Control Monitor
Use Mode II to determine if the air/fuel mixture is cycling correctly.
Warm the engine to normal operating temperature.
Turn the dial on the ECU fully clockwise (or if you have a switch, turn it on).
After the LED flashes twice, turn the dial fully counter clockwise (or turn the switch off).
Run the engine above 2000 RPM under no load while looking at the ECU.
If the RED LED blinks simultaneously with the GREEN LED, the air/fuel mixture is cycling properly.
If the RED LED stays off, the mixture is more than 5% rich.
If the RED LED stays on, the mixture is more than 5% lean.
If the RED LED stays on or off above 2000 RPM, complete the diagnostics before beginning repairs.

Mode III - Stored Fault Code Reporting
Use Mode III to retrive all stored trouble codes in memory.
Turn the ignition switch on, but do not start the engine.
On the ECU, turn the diagnostic mode selector screw fully clockwise (or if you have a switch, turn it on). Wait until the LED flashes 3 quick bursts, then turn the screw fully counter clockwise (or turn the switch off).
The check engine light will begin to flash trouble codes. Red flashes are units of ten and green flashes are units of one. (red-3 flashes, green-1 flash = code 31) Note all codes until it begins to loop.
To clear all stored codes, turn the screw fully clockwise (or turn the switch on). Wait until the LED flashes 4 quick bursts, then turn the screw fully counter clockwise (or turn the switch off). To retain the codes in memory, simply turn the ignition off.

KA24E Codes:
11 Crankshaft Position Sensor Circuit
12 Mass Air Flow Sensor Circuit
13 Engine Coolant Temperature Sensor Circuit
14 Vehicle Speed Sensor Circuit
21 Ignition Signal Missing in Primary Coil
31 Engine Control Unit (ECU)
33 Oxygen Sensor Circuit
41 Air Temperature Sensor Circuit
43 Throttle Position Sensor Circuit
55 No Malfunctions

Complete list of Codes for other models:
11 Crank Angle Sensor/Camshaft Position Sensor
12 Air Flow Meter/Mass Air Flow Sensor
13 Engine Coolant Temperature Sensor
14 Vehicle Speed Sensor
21 Ignition Signal
22 Fuel Pump
23 Idle Switch
24 Throttle Valve Switch
25 Idle Speed Control Valve
28 Cooling Fan Circuit
31 ECU
32 EGR Function
33 Heated Oxygen Sensor
34 Knock Sensor
35 Exhaust Gas Temperature Sensor
36 EGR Control-Back Pressure Transducer
37 Knock Sensor
38 Right hand bank Closed Loop (B2)
41 Intake Air Temperature Sensor
42 Fuel Temperature Sensor
43 Throttle Position Sensor
45 Injector Leak
47 Crankshaft Position Sensor
51 Injector Circuit
53 Oxygen Sensor
54 A/T Control
55 No Malfunction
63 No. 6 Cylinder Misfire
64 No. 5 Cylinder Misfire
65 No. 4 Cylinder Misfire
66 No. 3 Cylinder Misfire
67 No. 2 Cylinder Misfire
68 No. 1 Cylinder Misfire
71 Random Misfire
72 TWC Function right hand bank
73 TWC Function right hand bank
76 Fuel Injection System Function right hand bank
77 Rear Heated Oxygen Sensor Circuit
82 Crankshaft Position Sensor
84 A/T Diagnosis Communication Line
85 VTC Solenoid Valve Circuit
86 Fuel Injection System Function right hand bank
87 Canister Control Solenoid Valve Circuit
91 Front Heated Oxygen Sensor Heater Circuit right hand bank
94 TCC Solenoid Valve
95 Crankshaft Position Sensor
98 Engine Coolant Temperature Sensor
101 Front Heated Oxygen Sensor Heater Circuit right hand bank
103 Park/Neutral Position Switch Circuit
105 EGR and EGR Canister Control Solenoid Valve Circuit
108 Canister Purge Control Valve Circuit

Check or replace the sensor(s) and related components corresponding the list of stores trouble codes.

Mode IV - Switch Operation Monitor
Use Mode IV to determine if the Throttle Position Sensor (TPS), Starter circuit and/or Vehicle Speed Sensor (VSS) are in proper working order.
Turn the ignition switch on, but do not start the engine.
Turn the dial on the ECU fully clockwise. After the LED flashes 4 times, turn the dial fully counter clockwise.
Make sure the RED LED is turned off.
Make sure the RED LED turns on when depressing the gas pedal. If not, check or replace the Throttle Position Sensor.
Make sure the RED LED turns on when turning the ignition key the START position. If not, check or replace the starter.
Drive the vehicle with the ECU unbolted and within view. Make sure the GREEN LED turns on when speed is 12 MPH or more. If not, check or replace the Vehicle Speed Sensor.

Mode V - Real Time Diagnostic Function
Use Mode V to determine if the Crankshaft Position Sensor (CPS), Mass Air Flow (MAF) sensor and/or Ignition signal are working properly.

Start engine.
Turn the dial on the ECU fully clockwise.
After the LED flashes 5 times, turn the dial fully counter clockwise.
Make sure LEDs do not flash for 5 minutes when racing or idling the engine.
If it flashes, count the number of flashes, turn engine off, and see the following 3 paragraphs.
Perform real-time diagnosis insepction and repair or replace malfunctioning part if present.
If LEDs do not flash for 5 minutes, turn engine off.

If the RED LED flashes 3 times for 1.5 seconds, check the Crankshaft Position Sensor. Check the harness continuity at CPS when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes twice-3 times for 0.5 seconds, check Mass Air Flow Sensor. Check the harness continuity at MAF when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes 4 times for 0.2 seconds 3 times, check the ignition signal. Check the harness continuity when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.
Is there also some info for the Terrano (japanese brother of the Pathfinder)
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post #10 of 15 Old Sep 8th, 2007, 01:08 AM
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The info should be the same for gas/petrol engines. Diesel, no idea.

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'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
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post #11 of 15 Old Jul 30th, 2008, 03:54 PM
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FYI- I have a 91 Nissan pickup, 4cyl, 2wheel drive, standard trans. My ecm has a red and green light. I assume one is first number and one is second number. Other than that, the instructions on how to get to this point works great. Thanks.
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post #12 of 15 Old Mar 15th, 2009, 05:18 PM
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sry to bring back up this topic but i wanted to know where is the MIL light on the 1990 nissan pathfinder, because i dont see a check engine light or anything like that so i dont know if another light on the dash subsitutes for the MIL light
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post #13 of 15 Old Mar 17th, 2009, 12:18 AM
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On my 91 Nissan 2x4, there is no dash check engine light. You have to look at the ECM under the passenger seat and count the dashes. See the directions above.
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post #14 of 15 Old Oct 29th, 2009, 05:05 PM
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ECU Codes code 21 how to read.. Ignition Signal

I have a 92 D21 4x4 etra cab truck...I need help reading the ECU code..
What part to replace when you get the 21 code in mode 111 on the ecu..
My truck has run horrible ever since I did a tune up and changed the fuel filter.
I did have to pry the rotor off, after the tune up complete I drove the truck 10 miles, well now the truck will not run. it will idle but runs real rough and misses.I checked the wires etc,, all correct.. the mechanic said the fuel is too rich and my ECU need replaced... the trouble code reads 21 in mode 111... I want to fix this truck myself.
Please help
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post #15 of 15 Old Jul 21st, 2010, 12:47 AM
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Alright guys and gals, I've got a 1991 Nissan 2.4L 4x4, 5-spd, giving me troubles.. its giving me the following codes, 23,35,12. they are 23. Mass Air Flow, 35 TP sensor, 12-O2 sensor. now i replaced them all w/ brand new parts.. and my ECU is failing to reset.. i have left it off the battery for 48hrs. and still not resetting.. and tried resetting it with the screw on the ECU... any help on this one would help me out alot!!!

-Steve
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