Sep 132018
 

Nissan Altima

I need to repair the blend or mode motor and door assembly. I can’t get defrost or floor vent to open. The air conditioning only blows at me. How do I reach the blend door assembly?


You will need to remove the instrument cluster from the dash panel(see video). Then you will need to remove the BCM that is located behind the instrument cluster.

Mode Door Motor Replacement

Mode Door Motor Removal

    1. Remove the Instrument Cluster.

  1. Remove the BCM.
  2. Disconnect the mode door motor connector (1).
  3. Remove the mode door motor screws (A) and then remove the mode door motor.

2011-nissan-altima-mode-door-motor-location-diagram

Mode Door Motor Installation

  • Installation is in the reverse order of removal.

 

Aug 012018
 

Nissan Altima

Hello I have a 2002 Altima that was perfect, no problems. Then tried to start it and nothing, engine wouldn’t even turn over. However the dash light would blink then when I tried to jump it, it tried to start without the key in the ignition. Then a buddy was looking at it and had the negative cable off the post and tapped the post with the cable and the car again tried go start without the key… What could be the problem???


Somewhere there is a wire crossed or cable shorted. If there has been recent work done, start there. Follow the link and you will find a step by step diagnostic chart for no start conditions. Remember to start with a fully charged known good battery.

Battery Replacement

Before you disconnect the cable(s), first turn the ignition to the OFF position. This will prevent a draw on the battery which could cause arcing (electricity trying to ground itself to the body of a vehicle, just like a spark plug jumping the gap) and damaging components such as the alternator diodes.

When working on any electrical component in the vehicle, it is always a good idea to disconnect the negative battery cable. This will prevent potential damage to many sensitive electrical components such as the Engine Control Module (ECM), radio and alternator.

Disconnecting the negative battery cable first will also prevent accidentally grounding the positive terminal to the body of the vehicle when disconnecting the battery creating a short to ground.

Reconnect battery cables by installing the positive cable first. Then connect the negative cable. This will reduce the possibility for voltage spike to occur that can affect the operation of sensitive electronic components. Be sure to check that your lights, windshield wipers and other electrically operated safety components are working correctly. If your vehicle contains an electronically tuned radio don’t forget to also reset your radio stations and clock.

Jul 102018
 

2014 Nissan Rogue

Air Conditioning high side pressure

I started having issues with my A/C system a while ago. It was not very strong in general and when I drove long distances, after about 20 minutes, there would be on and off cold air.
When I connected a manifold, the values with the engine off were fine but once I turned the engine on, the low side would immediately go into “retard” while the high side would read about 145 psi.
In the past, I hit an object in the front of my car, so I knew that the condenser might have an issue. It was a little bent and with a thermometer, I saw a significant difference in temperature in areas right next to each other, therefore I replaced it. However, since it still gave me the same readings, I also exchanged the compressor. The clutch had been working (actually constantly running) but I never heard it humming.

Still having the same readings.

What else could be the problem? The TXV, evaporator or orifice tube? How can I test them before attempting to replace?

Thank you!


Anytime you replace the Air Conditioning compressor the manufacturer recommends that you flush the entire system. The manufacturer also requires that the orifice tube and accumulator/expansion valve be replaced at the same time. If this is not done the manufacturers warranty is void.  With that in mind if you are getting a higher reading there may still be a restriction.

Feb 272018
 

2003 Nissan Pathfinder

I need to know how to test the intake valve timing control solenoid.


Intake Valve Timing Control ( IVTC)

The intake valve timing control (IVTC) solenoid is activated by on/off pulse duty signals from the ECM. The IVTC solenoid valve changes the amount of oil and direction of flow through IVTC unit or stops flow. The longer the pulse width the more valve angle advances. Shorter pulse width retards valve angle. When on and off pulse widths become equal, solenoid valve stops oil pressure flow, and intake valve angle is fixed at control position.

Intake Control Valve Control Solenoid Testing

    1. Turn ignition off. Disconnect IVTC solenoid valve 2-pin connector. Turn ignition on. Measure the voltage between ground and IVTC solenoid valve harness connector terminal No. 1 (Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 3.
    2. Check the following:
      • Harness connectors E1 and M1.
      • Harness connectors M33 and F22.
      • Check Harness continuity between IVTC solenoid valve and ECM relay.

      Repair harness or connectors.

    3. Turn ignition off. Disconnect ECM 116-pin harness connector. Check continuity of Orange/Black wire between Bank 1 IVTC solenoid valve harness connector terminal No. 2 and ECM harness connector terminal No.11, or Pink/Blue wire between Bank 2 IVTC solenoid valve harness terminal N0. 2 and ECM harness connector terminal No. 10. Also check circuit for short to ground and short to voltage. If problem is found, repair as necessary. After repair, repeat DTC confirmation test. If no problem is found, go to next step.
    4. Measure resistance between IVTC solenoid valve terminal No. 1 and 2 (component side). Resistance should be 7.0 – 7.7 ohms at 68 degrees F. Check continuity between ground and IVTC solenoid valve terminal one at a time. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not specified, replace IVTC solenoid valve and retest system. After repair, repeat DTC confirmation test.
    5. No problem is indicated at this time. Problem may be intermittent.

intake timng control valve

Jan 112018
 

2005 Nissan Micra

I have just bought a Nissan Micra 2005 and have noticed that it’s really hard to shift gear and the engine makes a struggling noise when I press the clutch down while in neutral or gear. Luckily, I have 3 months warranty and will be taking it back to be fixed. I’d like to know what’s most likely to be the cause of this problem please, and if the fix job could easily be masked to make the car run longer?


Hard to shift gear

  • Hard to shift gears – Most likely failing clutch master cylinder and clutch slave cylinder
  • Noise when clutch pedal is pressed – Clutch release bearing failing

The most common fix would be to replace the clutch master and slave cylinders. Also replacing the clutch, clutch pressure plate and release bearing.

 

Jan 112018
 

Nissan Altima

I have a 2006 Nissan Altima 2.5 4 – I replaced the pre-cat with a header because I heard that they would break apart and ruin the engine. However, now the engine light keeps coming on. Will an O2 sensor simulator fix the issue. I have tried to put a spacer on the header, but that did not help. I am told there are 2 o2 sensors, but only find 1. Thanks for any help!!


Removing Catalytic Converter

Replacing the exhaust manifold with a header is generally done for performance reasons (note* the exhaust manifold and catalytic converter are one assembly). There is nothing that would break apart and enter the engine as far as the catalytic converter is concerned. This is because it is mounted out the output side of the engine cylinder head.

catalytic converter with O2 sensor location diagram - 2006 Nissan Altima

Using O2 Sensor Simulator

The original setup includes two oxygen sensors. One before the catalytic converter and one after. The Oxygen sensor that is mounted before the (upstream)converter is used to determine air/fuel mixture. The O2 sensor mounted after the converter(downstream) is used to determine the efficiency of the converter. So if the simulator you are proposing to use is to fake out the downstream sensor, then yes it should take care of the check engine light issue.

Nov 012017
 

1997 Nissan Altima

My car is dead. I put in new battery and it is still dead. What to check?


  • Look at the battery connections for corrosion or being loose.
  • Check battery cables for internal corrosion.
  • Check Fusible Link in positive battery cable. Located between battery and alternator.
  • Faulty ignition switch or poor connection
  • Wiring Harness

Starting System Wiring Diagram – 1997 Nissan Altima

(best viewed in Google Chrome or Firefox)
1997-nissan-altima-starting-circuit-1-of-1

Sep 252017
 

Nissan Maxima

Multiple Codes

Car has 152,000 miles. Car idles and revs fine while in park. When driving it clatters and looses power it you give it more than 25% throttle. I took it to Firestone and they did a diagnostic on it and it gave them the following codes:P0420- CATALYST EFFICIENCY BELOW NORMAL (BANK 1)…..P1574-ASCD VEHICLE SPEED SENSOR MALFUNCTION….P0300-MULTIPLE MISFIRE DETECTED….P0720TCM REVOLUTION SENSOR CIRCUIT MALFUNCTION. The mechanic at Firestone said that he does not know why the car is acting like this and referred me to a Nissan dealer. I am trying to avoid that because I know the cost would be astronomical for them to diagnose and fix it. It was running fine and then all the sudden it was like it is possessed. Any ideas?


The code P0420 generally means the catalytic converter isn’t functioning as it should. Now if you have been driving it with a misfire for a while it may have caused a larger issue. The unburnt fuel gets shoved out into the catalytic converter and can cause it to clog. If the converter is clogged it will act as you described. A back pressure gauge is inserted in the front O2 Sensor port to check for this. If there is more than 3 psi at 1500 rpm the converter is clogged. Generally if this is the case the car will perform normal at first and as the engine warms up the performance will fade. I have provided the code information below.

Nissan Code P1574

Description: Automatic Speed Control Device Vehicle Speed Sensor

Code P1574 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty

Nissan Code P0720

Description: Output Shaft Speed Sensor Circuit

Code P0720 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty
  6. Transmission system malfunction

Nissan Code P0420

Description: Catalyst System Efficiency Below Threshold Bank 1

Code P0420 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty
  6. HO2S sensor contamination/damaged
  7. Exhaust leaks or restrictions
  8. Catalytic converter damage
  9. Catalytic converter improper operation

Nissan Code P0300

Description: Random – Multiple Misfire Detected

Code P0300 Probable Causes

  1. Vacuum leaks, damaged hoses or improper routing
  2. Fuel contamination
  3. Ignition system – Ignition module, coil, spark plugs and wires
  4. Fuel system
Sep 182017
 

2006 Nissan Almera

Will not move

My car starts alright but will not move. The previous day my first and second gears took a long time to accelerate and there was a smell of something burning (clutch probably) after my drive.


Sounds about right. If the clutch is slipping or worn out the vehicle will not want to move. Something you can try. Hold the brake and let out on the clutch pedal. It the engine does not die, the clutch is shot.