Car will not rev up when gas is pushed

Tiny
JOSHHH
  • MEMBER
  • 2002 JAGUAR X-TYPE
  • 3.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
I just bought the car, I was able to drive it home and everything. I knew there was problems that was going to need fixed after I took the intake off to check spark plugs. It won’t rev up when I press the gas. I have a code reader, I replaces the MAP, MAF, ignition coils, spark plugs, and have a fuel pressure sensor on the way everything it said was wrong but it still won’t rev. What could the issue be?
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Thursday, October 10th, 2019 AT 6:45 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

If there is no throttle response, chances are it is related to one of the throttle position sensors. There are two on the engine and one on the accelerator pedal itself.

What I need you to do is check for diagnostic trouble codes related to these sensors. One will most likely be at fault.

Here is a quick video showing how to retrieve codes:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but often times a parts store will lend / rent one to you. This is a test that really needs done otherwise it becomes a guessing game.

If I had to guess (and I don't like doing that) I would say the sensor on the accelerator pedal itself is bad. If one of the other 2 was an issue, I feel you would get some degree of throttle response.

Let me know what you find or if you have other questions. Also, if you need more information, I need to know if this vehicle was made for the US market.

Take care,
Joe
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Friday, October 11th, 2019 AT 7:04 PM
Tiny
JOSHHH
  • MEMBER
See I have already replaced a TPS and it still doesn’t show that I’m pressing in the gas.
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Monday, October 14th, 2019 AT 1:48 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Which sensor was replaced? Was it the one on the pedal or on the throttle body?

Let me know.
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Monday, October 14th, 2019 AT 5:42 PM
Tiny
JOSHHH
  • MEMBER
It was the throttle body sensor.
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Monday, October 14th, 2019 AT 9:03 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
There is also a sensor on the gas pedal. Here are the directions for testing it. Let me know if you have the tools needed.

__________________________________

2002 Jaguar X-Type (X400) V6-3.0L
Test B: Accelerator Pedal Demand Sensor
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P1215 Test B: Accelerator Pedal Demand Sensor
TEST B: ACCELERATOR PEDAL DEMAND SENSOR
B : DTC P1122, P1123, P1215, P1216, P1344

B1 : CHECK THE ACCELERATOR PEDAL DEMAND SENSOR OUTPUT

1. Turn the ignition switch to the RUN position.
2. Measure the voltage between electrical connector PA1-6 and ground with the accelerator pedal released and with the accelerator pedal at full throttle.
3. Measure the voltage between electrical connector PA1-3 and ground with the accelerator pedal released and with the accelerator pedal at full throttle.

Does the voltage vary between 0.3 volts and 5 volts?
Yes
Goto B4

No
Goto B2

B2 : CARRY OUT AN ACCELERATOR PEDAL POSITION SENSOR COMPONENT CHECK

1. Remove the accelerator pedal.
2. Measure the resistance between pin 1 and pin 6 of the accelerator pedal.
3. Measure the resistance between pin 2 and pin 3 of the accelerator pedal.

Is the resistance between pin 1 and pin 6 between 546 and 1134 ohms, and between pin 2 and pin 3 between 975 and 2025 ohms?
Yes
Goto B3

No
INSTALL a new accelerator pedal. For additional information, refer to. CLEAR the DTC. TEST the system for normal operation.

B3 : CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR A SHORT TO GROUND

1. Disconnect the PCM electrical connector EN16.
2. Measure the resistance between electrical connector PA1-6 and ground.
3. Measure the resistance between electrical connector PA1-3 and ground.

Is the resistance greater than 10,000 ohms?
Yes
Goto B4

No
REPAIR the accelerator pedal demand sensor circuit from the PCM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.

B4 : CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR OPEN CIRCUIT

1. Disconnect the PCM electrical connector EN16 and the accelerator pedal electrical connector PA1.
2. Measure the resistance between EN16-103 and PA1-6.
3. Measure the resistance between EN16-102 and PA1-3.

Is the resistance less than 5 ohms?
Yes
DIAGNOSE the electronic engine control system.

No
REPAIR the accelerator pedal demand sensor circuit from the PCM to the accelerator pedal. CLEAR the DTC. TEST the system for normal operation.

I attached two pics so you can see which sensor I am referring to. Let me know if this helps or if you have other questions.

Joe
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Tuesday, October 15th, 2019 AT 5:04 PM

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