P1122 Land Rover Code - Accelerator Pedal Position Sensor Short Circuit To Ground
Quick Answer
The Accelerator Pedal Position (APP) sensor is located in plastic housing which is integral with the throttle pedal. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, APP Sensor harness is open or shorted, APP Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1122 Land Rover indicates Accelerator Pedal Position Sensor Short Circuit To Ground.
- Common causes
- Common causes include Faulty Accelerator Pedal Position (APP) Sensor, APP Sensor harness is open or shorted, APP Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1122 Land Rover Description
The sensor has a spigot which protrudes into the housing and provides the pivot point for the pedal mechanism. The spigot has a slot which allows for a pin, which is attached to the sensor potentiometers, to rotate through approximately 90°, which relates to pedal movement. The pedal is connected via a link to a drum, which engages with the sensor pin, changing the linear movement of the pedal into rotary movement of the drum. The drum has two steel cables attached to it. The cables are secured to two tension springs which are secured in the opposite end of the housing. The springs provide 'feel' on the pedal movement and require an effort from the driver similar to that of a cable controlled throttle. A detente mechanism is located at the forward end of the housing and is operated by a ball located on the drum. At near maximum throttle pedal movement, the ball contacts the detente mechanism. A spring in the mechanism is compressed and gives the driver the feeling of depressing a 'kickdown' switch when full pedal travel is achieved.
The APP sensor has two potentiometer tracks which each receive a 5V input voltage from the ECM. Track 1 provides an output of 0.5V with the pedal at rest and 2.0V at 100% full throttle. Track 2 provides an output of 0.5V with the pedal at rest and 4.5V at 100% full throttle. The signals from the two tracks are used by the ECM to determine fuelling for engine operation and also by the ECM and the EAT ECU to initiate a kickdown request for the automatic transmission.
The ECM monitors the outputs from each of the potentiometer tracks and can determine the position, rate of change and direction of movement of the throttle pedal. The 'closed throttle' position signal is used by the ECM to initiate idle speed control and also overrun fuel cut-off.
What are the Possible Causes of the DTC P1122 Land Rover?
- Faulty Accelerator Pedal Position (APP) Sensor
- APP Sensor harness is open or shorted
- APP Sensor circuit poor electrical connection
How to Fix the DTC P1122 Land Rover?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1122 Land Rover code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1122 Land Rover Code
1. What are the common symptoms of OBDII code P1122 on a Land Rover related to the accelerator pedal position sensor short circuit to ground?
The common symptoms include loss of engine power, acceleration issues, and the vehicle going into limp mode.
2. What are the possible causes of the OBDII code P1122 on a Land Rover indicating a short circuit to ground in the accelerator pedal position sensor?
Possible causes include damaged wiring or connectors, a faulty accelerator pedal position sensor, or issues with the vehicle's ECM.
3. How can I diagnose the OBDII code P1122 on my Land Rover for a short circuit to ground in the accelerator pedal position sensor?
Diagnosis involves checking the wiring and connectors for damage, testing the accelerator pedal position sensor for proper function, and inspecting the ECM for any faults.
4. Can I drive my Land Rover with the OBDII code P1122 indicating a short circuit in the accelerator pedal position sensor?
It is not recommended to drive the vehicle with this issue as it can lead to unsafe driving conditions and potential further damage to the vehicle.
5. How can I repair the OBDII code P1122 on my Land Rover caused by a short circuit in the accelerator pedal position sensor?
Repairing the issue involves addressing the root cause, which could be fixing damaged wiring, replacing the accelerator pedal position sensor, or reprogramming the ECM.
6. Will resetting the OBDII code P1122 on my Land Rover solve the issue of the accelerator pedal position sensor short circuit to ground?
Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the short circuit in the accelerator pedal position sensor.
7. Are there any DIY tips for troubleshooting the OBDII code P1122 on a Land Rover with a short circuit in the accelerator pedal position sensor?
DIY tips include visually inspecting the wiring and connectors for damage, checking for loose connections, and ensuring proper grounding.
8. How much does it typically cost to repair the OBDII code P1122 on a Land Rover due to a short circuit in the accelerator pedal position sensor?
The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
9. Can a professional mechanic help diagnose and repair the OBDII code P1122 on my Land Rover for a short circuit in the accelerator pedal position sensor?
Yes, a qualified mechanic with experience in handling OBDII codes can diagnose the issue using specialized tools and repair it effectively to ensure optimal vehicle performance.
10. Is the OBDII code P1122 related to a short circuit in the accelerator pedal position sensor a common issue in Land Rovers?
While it may not be extremely common, instances of this code occurring due to a short circuit in the accelerator pedal position sensor have been reported in Land Rover vehicles.
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