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Gene
Gene, Auto Service Technician
Category: Car
Satisfied Customers: 5276
Experience:  ASE Master 25 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.
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I have a 2002 rodeo lx and I am getting a p1290 code on the

Customer Question

I have a 2002 rodeo lx and I am getting a p1290 code on the check engine display. What does it mean?
Submitted: 1 year ago.
Category: Car
Expert:  Dan replied 1 year ago.

Hello, my name is***** or 4 cylinder engine? Thanks.

Customer: replied 1 year ago.
v6
Customer: replied 1 year ago.
V6
Expert:  Dan replied 1 year ago.

Have any other codes ever set or only this one?

Customer: replied 1 year ago.
I have been trying to clear a repaired 135 cod and when I pluged in the reader I got the P1290 code
Expert:  Dan replied 1 year ago.

Does P0135 clear? Does P1290 clear at all?

Customer: replied 1 year ago.
I don't get the 135 code ( 02 sensor) when the p1290 came on
Expert:  Dan replied 1 year ago.

Disconnect battery and touch cables together for 10 minutes with battery disconnected, let me know if that clears code. Thanks.

Customer: replied 1 year ago.
Should the car be running ?
Expert:  Dan replied 1 year ago.

No, car should be off.

Customer: replied 1 year ago.
OK this will take a while.
Expert:  Dan replied 1 year ago.

No problem, let me know how it goes. Thanks.

Customer: replied 1 year ago.
OK, still get the 1290 code , so I guess I'll take it to the computer guy tomorrow and he might can tell me
Expert:  Gene replied 1 year ago.

P1290, REPLACED ACCELERATOR PEDAL POSITION SENSOR

Complaint

The customer states the check engine light is on.

Cause

Connected a scan tool and found code P1290 - Electronic Throttle Control Forced Idle Mode. Performed a visual inspection of the accelerator pedal position sensor, and found no obvious faults. At idle, used a multi-meter to check for the presence of voltage and ground at the accelerator pedal position sensor, and found both were present. At idle, used the scan tool to monitor live data and found the accelerator pedal position sensor signal parameter was erratic. Used the multi-meter to measure the resistance of the accelerator pedal position sensor, and found the measured resistance was out of specifications. The results of these tests verified the accelerator pedal position sensor was faulty.

Correction

Replaced the accelerator pedal position sensor, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

Component Tests

Accelerator Sensor -> Fuel Injection

  • Operation

    Accelerator position sensor. The APS is used to signal the PCM for "drive by wire" operation. 3 sensors are used for the PCM to monitor throttle position and rate of change.


  • Location

    Best test Location:

    At APS connector.

    Component Location:

    Top side of throttle pedal.


  • Connector

    VIEW: HARNESS SIDE, BACKPROBING.

    1=PCM(+5V) APS3

    "Orange"

    3=PCM(-) APS2

    "Blue"

    4=PCM(-) APS1

    "RED"

    5=APS1 SIGNAL

    "White"

    6=APS3 SIGNAL

    "Blue-Green"

    7=PCM(-) APS3

    "Orange-Blue"

    8=PCM(+5V) APS2

    "Green"

    9=APS2 SIGNAL

    "Yellow"

    10=PCM(+5V) APS1

    "Black"


  • Tech Notes

    Engine will not start if accelerator pedal is depressed while cranking.


  • Tests

    Out Of Range No Sig Test

    If voltage is out of Range or no voltage signal appears then;

    Connect test leads:

    Yellow=PCM(-) APS

    Black=known good ground

    KOEO, voltage should be below 100mv. If OK;

    Connect test leads:

    Yellow=PCM(+5V) APS

    Black=known good ground

    KOEO, voltage should be about 5.0V.


  • Dc Voltage Test

    Connect test leads:

    Yellow=APS signal

    Black=known good ground

    KOEO,should be about:

    Closed

    There should be no dropouts or glitches during test.


Throttle Control System -> Throttle Actuator/Tps -> Fuel Injection

  • Operation

    Throttle actuator operates throttle valve for "drive by wire". The valve is moved by a reversible DC motor controlled by the PCM with PWM, reversing polarity. Valve position is monitored by the PCM with 2 TPS sensors.


  • Location

    Best test Location:

    At throttle actuator connector.

    Component Location:

    Top front of intake manifold.


  • Connector

    VIEW: HARNESS SIDE, BACKPROBING.

    1=PCM(-) TPS1

    "Green"

    2=MOTOR(+)

    "Green"

    3=MOTOR(-)

    "Blue"

    4=PCM(-) TPS2

    "Green-White"

    5=PCM(+5V) TPS1

    "RED"

    6=TPS1 SIGNAL

    "Blue"

    7=TPS2 SIGNAL

    "Blue-White"

    8=PCM(+5V) TPS2

    "RED-White"


  • Tests

    Dc Voltage Test

    Connect test leads:

    Yellow=TPS signal

    Black=known good ground

    KOER,should be about:

    Throttle: closed WOT

    TPS 1 ..0.8V.. 4.0V

    TPS 2 ..4.2V.. 1.1V.

    There should be no dropouts or glitches during test. May have to be driven for accurate testing.


  • Dc Voltage Test

    Connect test leads:

    Yellow=actuator motor

    Black=actuator motor

    KOER, half of the screen will be covered with a signal. Snap throttle will cause the signal to switch to the other half of the screen.


  • Out Of Range No Sig Test

    If voltage is out of Range or no voltage signal appears then.

    Connect test leads:

    Yellow=PCM(-)

    Black=known good ground

    KOEO, voltage should be below 100mv. If OK:

    Connect test leads:

    Yellow=PCM(+5V)

    Black=known good ground

    KOEO, voltage should be about 5.0V.

Expert:  Gene replied 1 year ago.

Hello, do you need more help with this concern?