ENIGEN SURGES DOES NOT RESPOND TO THROTTLE POSITION

DTC P0121: Throttle Position (TP) Sensor 1 Performance
Circuit/System Description
The engine control module (ECM) uses the following information to calculate an expected airflow rate:
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The throttle position (TP)

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The barometric pressure (BARO)

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The manifold absolute pressure (MAP)

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The intake air temperature (IAT)

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The engine RPM

P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Circuit/System Testing

1. Inspect for the following conditions:
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Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label



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Inspect thoroughly for any type of leak or restriction



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Air leaks at throttle body mounting area and intake manifold sealing surfaces



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Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.


2. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts.
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If more than 4 volts or less than 0.8 volt, refer to DTC P0106.

3. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle.
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If the MAP sensor kPa does not change, refer to DTC P0106.

4. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
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Idle the engine.



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Increase the engine speed slowly to 3,000 RPM, then back to idle.



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Exit from the snapshot and review the data.



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Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.



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If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.


5. Inspect the throttle body for the following conditions:

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Loose or damaged throttle blade

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Broken throttle shaft

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Any throttle body damage

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If any of these conditions exist, replace the throttle body assembly.

Here are the 3 engines listed for this year. IGNITION TIMING

2002 Nissan/Datsun Truck Frontier Pickup 2WD 2.4L SFI 4cyl

The Ignition Timing

18-22 DegreesBefore top dead center - When throttle positionsensor disconnected and using suitably programmedscan tool.When adjusting idle speed, set parking brake & chock drive wheels, curb idle speed (750-850 RPM)transmission in neutral.

IGNITION TIMING

2002 Nissan/Datsun Truck Frontier Pickup 2WD 3.3L SFI 6cyl

The Ignition Timing

8-12 DegreesBefore top dead center - throttle position sensorharness disconnected.When adjusting idle speed, set parking brake & chock drive wheels, curb idle speed (700-800 RPM)transmission in neutral.

IGNITION TIMING

2002 Nissan/Datsun Truck Frontier Pickup 2WD 3.3L SFI SC 6cyl

The Ignition Timing

8-12 DegreesBefore top dead center - throttle position sensorharness disconnected.When adjusting idle speed, set parking brake & chockdrive wheels, curb idle speed (700-800 RPM)transmission in neutral.

What engine does it have ? Could have come with 5 different ones . If it has the 1.6 L engine . has electronic throttle control.
The throttle actuator control (TAC) system is used to improve emissions, fuel economy, and driveability. The TAC system eliminates the mechanical link between the accelerator pedal and the throttle plate. The TAC system eliminates the need for a cruise control module and idle air control motor. The following is a list of TAC system components:
• The accelerator pedal assembly includes the following components:
- The accelerator pedal
- The accelerator pedal position (APP) sensor 1
- The APP sensor 2
• The throttle body assembly includes the following components:
- The throttle position (TP) sensor 1
- The TP sensor 2
- The throttle actuator motor
- The throttle plate
• The engine control module (ECM

Check engine light lit ?

500 RPM or 5000? Reason I ask is the rev limiter shouldn't let it rev over 3500 in park or neutral? If idling at 500 then get an external tachometer and connect it to determine that your gauge isn't faulty! if at 5000 RPM it could be a stuck tps or possibly debris in the throttle body or a vacuum leak causing the idle to increase? Is it idling high or low compared to before it became faulty?

If you need further help, reach me via phone at https://www.6ya.com/expert/james_8f14c50d9c6cdea8

Hi,
Mass airflow sensor, idle air control valve, throttle position sensor could be @ fault. Is the Check Engine Light on?

Td

Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?

sounds like its breaking down, check your ignition system, test your leads, check your plugs, check your ignition coils etc etc etc.

4.7? I've had a few of these trucks do this with bad Throttle Position Sensors.

check the module and coil pack in the distributor

put a throttle position sensor on the throttle boby this should fix the problem!