Checkenginelighton 4 sensors replaced what next

Hi Chris.

p0304 = Number 4 Cylinder Misfire Detected

Faulty spark plug 4
Clogged or faulty fuel injector 4
Faulty ignition coil 4
Fuel injector 4 harness is open or shorted
Fuel injector 4 circuit poor electrical connection
Ignition coil 4 harness is open or shorted
Ignition coil 4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4.


p0102 = Mass or Volume Air Flow Circuit Low Input

Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner.
Reset code and drive vehicle.
If the code comes back, it may be necessary to replaced the mass air flow sensor.


p0154 = O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.


p0113 = Intake Air Temperature Sensor Circuit High

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.



Hope this helps
FYT

http://www.autocodes.com/make/nissan

Check for intake leaks, intake hose leaks, check mass air flow sensor.
02 sensors will keep setting off a lean code until the air problem is fixed.

THROTTLE POSITION SENSOR, MISFIRE, #4 MISFIRE, KNOCK SENSOR, THESE ARE YOUR TROUBLE CODES, PO120,PO300, PO304, PO325, RESPECTIVELY, REPLACE THE TPS @ THROTTLE BODY, REPLACE KNOCK SENSOR , @ ENGINE BLOCK, REPLACE YOUR SPARK PLUGS & PLUG WIRES ! AND YOU MUST ALSO REPLACE BOTH YOUR AIR & FUEL FILTERS, DISTRIBUTOR CAP & ROTOR , INSPECT, MAY NEED TO REPLACE, I WOULD ANYWAY !!!!!!!! ADD SOME GOOD FUEL INJECTOR CLEANER TO TANK, NEXT FUEL UP !

replace the output speed sensor on you 4 speed trans, 3.3 engines only have 4 speed transmissions. The output sensor is located next to the transfer gear. Or if you are looking the two sensors, it would be the one on the right.

P700 = PCM has a transmission code in the EATX controller, and P0731= Gear ratio error in 1st. Replace the output speed sensor and clear the codes.

There is a problem with the emissions system. You need to have the ECU scanned to retrieve the code that has been set. This code will help to indicate which part of the emissions system is being effected. Most auto parts stores will scan the ECu for free.

This is one of two things, if the truck goes into drive and moves then you have trany problems and may need to have it rebuilt, if there is no movement in reverse or drive then it could be the transfer case or trany.

Possible Cause
The following items may be area of concern:
?¬Other transmission-related DTCs are set.
?¬Solenoid pack connector 5-volt supply circuit open.
?¬Sensor signal circuit has short to ground, short to voltage or open.
?¬Governor pressure sensor defective.
?¬Transmission fluid burnt or oil pan contains excessive debris.
?¬Governor pressure out of range.
?¬Transmission leaking internally.
?¬Defective PCM.
?¬Defective valve body.

Diagnostic Procedure
1.Using scan tool, read DTCs. If good trip counter for DTC P1756 is not displayed or displayed count is not zero, go to step 25. If good trip counter is displayed and displayed count is zero, go to next step.
2.Repair any other transmission-related DTCs before proceeding. If no other transmission-related DTCs exist, go to next step.
3.Check transmission fluid for proper level and for any debris. Fill or repair transmission as necessary. If fluid level and condition are okay, go to next step.
4.Start engine. Allow engine to reach normal operating temperature. Set parking brake, depress brake pedal and place gearshift lever in "D" position. Using scan tool, observe governor pressure sensor pressure. If pressure is greater than 3 psi (.2 kg/cm 2 ), go to next step. If pressure is 3 psi (.2 kg/cm 2 ) or less, go to step 20.
5.Turn ignition off. Install a pressure gauge at transmission governor pressure test port. Start engine. With gearshift lever in "D" position, observe gauge pressure. If pressure is 5 psi (.3 kg/cm 2 ) or more, go to step 23. If pressure is less than 5 psi (.3 kg/cm 2 ), go to next step.
6.Turn ignition off. Disconnect transmission solenoid assembly connector. Turn ignition on. Measure voltage between ground and 5-volt supply circuit at transmission solenoid harness connector terminal No. 2. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step 19.
7.Turn ignition off. Disconnect PCM harness connector C2 (White). Measure resistance of governor pressure sensor signal circuit between transmission solenoid harness connector terminal No. 4 and PCM harness connector C2 (White) terminal No. 29. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair governor pressure sensor signal circuit for open.
8.Disconnect PCM harness connector C1 (Black). Measure resistance of sensor ground circuit between transmission solenoid harness connector terminal No. 3 and PCM harness connector C1 (Black) terminal No. 4. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair sensor ground circuit for open.
9.Measure resistance of governor pressure sensor signal circuit between ground and transmission solenoid harness connector terminal No. 4. If resistance is less than 5 ohms, repair signal circuit for short to ground. If resistance is 5 ohms or more, go to next step.
10.Measure resistance between sensor signal circuit and sensor ground circuit at transmission solenoid harness connector terminals No. 3 and 4. If resistance is less than 5 ohms, repair governor pressure sensor circuit for short to sensor ground circuit. If resistance is 5 ohms or more, go to next step.
11.Turn ignition on. Measure voltage of governor pressure sensor signal circuit between ground and transmission solenoid assembly connector terminal No. 4. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair sensor signal circuit for short to voltage.
12.Turn ignition off. Ensure transmission solenoid harness connector is disconnected. Remove transmission oil pan. Disconnect governor pressure/temperature sensor harness connector. Inspect connector and terminals for damage. Repair as necessary. Measure resistance of governor pressure sensor 5-volt supply circuit between governor pressure/temperature sensor harness connector terminal "A" and transmission solenoid harness connector terminal No. 2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace transmission solenoid assembly (internal transmission harness).
13.Measure resistance of sensor ground circuit between governor pressure/temperature sensor harness connector terminal "D" and transmission solenoid harness connector terminal No. 3. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace transmission solenoid assembly (internal transmission harness).
14.Measure resistance of governor pressure sensor signal circuit between governor pressure/temperature sensor harness connector terminal "B" and transmission solenoid harness connector terminal No. 4. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace transmission solenoid assembly (internal transmission harness).
15.Measure resistance of governor pressure sensor signal circuit between ground and governor pressure/temperature sensor harness connector terminal "B". If resistance is less than 5 ohms, replace transmission solenoid assembly (internal transmission harness). If resistance is 5 ohms or more, go to next step.
16.Measure resistance between governor pressure sensor signal circuit and sensor ground circuit at governor pressure/temperature sensor harness connector terminals "B" and "D". If resistance is less than 5 ohms, replace transmission solenoid assembly (internal transmission harness). If resistance is 5 ohms or more, go to next step.
17.Reconnect transmission solenoid assembly harness connector. Turn ignition on. Measure voltage of governor pressure sensor signal circuit between ground and governor pressure/temperature sensor harness connector terminal "B". If voltage is more than one volt, replace transmission solenoid assembly (internal transmission harness). If voltage is one volt or less, go to next step.
18.Turn ignition off. Using DVOM, backprobe governor pressure sensor signal circuit at PCM harness connector C2 (White) terminal No. 29. Start and idle engine. Place gearshift lever in "N" position. Using scan tool, observe governor pressure sensor voltage. Compare scan tool value with DVOM voltage. If voltages match, replace governor pressure/temperature sensor. If voltages do not match, replace PCM.
19.Turn ignition off. Ensure transmission solenoid harness connector is disconnected. Disconnect PCM harness connector C2 (White). Measure resistance of 5-volt supply circuit between transmission solenoid harness connector terminal No. 2 and PCM harness connector C2 (White) terminal No. 31. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair 5-volt supply circuit for open.

NOTE: Removing transmission control relay in the following step may set other DTCs. Disregard these DTCs.

Replacing the Sensor 1. Disconnect the negative battery cable...just like on every other installation 2. Detach the CMP sensor connector next. 3. Remove the CMP sensor retaining bolt and remove the CMP sensor

Now to install:

1. Clean the CMP sensor surface and ensure that the O-Ring is in place. 2. Position the CMP sensor into the engine and tighten the retaining bolt to 71-106 inch lbs. 3. Attach the CMP sensor connector 4.Connect the negative battery cable.

Run this diagnostic
Test Procedures 
1. Check if DTC P0110 is set in addition to DTC P0105 or P0106. If DTC P0110 is set, go to next 
step. If DTC P0110 is not set, go to step 3 . 
2. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between ground 
and MAP sensor connector terminal No. 4 (Green wire). If resistance is one ohm or less, replace 
MAP sensor. If resistance is more than one ohm, repair open in Green wire between MAP sensor 
and ECM connector terminal No. 48. After repairs, clear DTC and verify MAP sensor operation. 
3. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between MAP 
sensor connector terminals No. 1 and 4 (component side). Resistance should be about 30,000 
ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace MAP 
sensor. After repairs, clear DTC and verify MAP sensor operation. 
4. Turn ignition on. Measure voltage between ground and MAP sensor connector terminal No. 2 
(Red wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is 
not as specified, repair open in Red wire between ECM connector terminal no. 44 and MAP 
sensor connector terminal No. 2. After repairs, clear DTC and verify MAP sensor operation. 
5. Turn ignition off. Disconnect ECM 63-pin connector. Check for continuity between ground and 
MAP sensor connector terminal No. 1 (Green wire). If continuity does not exist, go to next step. If 
continuity exists, repair short to ground in Green wire between MAP sensor and ECM. After 
repairs, clear DTC and verify MAP sensor operation. 
6. Reconnect MAP sensor connector and ECM connector. Turn ignition on. Backprobe MAP sensor 
connector and measure voltage between ground and MAP sensor connector terminal No. 1 (Green 
wire). Voltage should be 0.2-4.5 volts. If voltage is as specified, go to next step. If voltage is not 
as specified, replace MAP sensor. After repairs, clear DTC and verify MAP sensor operation. 
7. Check ECM connector for loose or damaged terminals. If problem exists, repair ECM connector. 
If problem does not exist, replace MAP. Clear DTC and verify system operation. If problem still 
exists, replace ECM. After repairs, clear DTC and verify system operation.

Good luck and hope this helps. If the car does not start diconnect the MAP sensor to get you to the parts store if you need it to get you there.

The Crankshaft Position Sensor is located directly next to the starter.

1. On 2.4L SRT-4 remove the lower inner cooler hose from the metal tube.
2. Remove the Structural Collar
3. Unlock and disconnect the electrical connector to the crankshaft position sensor.
4. Remove the crankshaft position sensor bolt.
5. Remove the sensor

Reverse Order to install except note that:

Use a twisting motion when installing the sensor.

Install and tighten the crankshaft position sensor bolt and tighten to 9 N·m (80 ±15 in. lbs.).