|Trouble Code||Fault Location||Probable Cause|
|P1135||Pedal Position Sensor A Circuit Intermittent (Ford) Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1 (Lexus, Scion, Toyota)|
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What Does Code P1135 Mean?
The Pedal Position Sensor (PPS) provides the powertrain control module or PCM with the information needed on throttle movement. It can be located on the throttle body or on the accelerator pedal inside the vehicle. In either case the sensor provides a 0-5V signal to the PCM, with .5 volts as the typical starting point. Once the voltage is above .5, the engine is said to be off idle; up to 4 – 4.5V it is usually around wide open throttle. If at .5 volts, the engine is said to be at idle speed. The voltage will vary based upon driver input.
Code P1135 is a manufacturer’s specific code and as such lets you know that diagnosing this condition may be different between manufacturer’s vehicles. In these instances, P1135 will set when the voltage being returned by the sensor does not match what is being received by the actual throttle position sensor or in some cases, it may be a calculated throttle position. This particular code can set if the voltage changes from normal to 0 volts or 5 volts for a very short period of time.
What are the common causes of code P1135?
Intermittent open in the power supply circuit to the pedal position sensor.
Intermittent short to ground in the power supply circuit to the pedal position sensor
- Intermittent open in the ground circuit to the pedal position sensor
- Intermittent open in the signal circuit to the pedal position sensor
- Intermittent short to 5 volts in the signal circuit to the pedal position sensor
- Intermittent short to ground in the signal circuit to the pedal position sensor
- Failed Pedal Position Sensor – possible
- Failed PCM – unlikely
What are the symptoms of code P1135?
- Malfunction Indicator Light “ON”
- Vehicle may not accelerate
- Intermittent Bucking or Surging
- Possibly poor fuel economy
How do you troubleshoot code P1135?
First, take a look and see if there are any technical service bulletins (TSB) for your particular vehicle. There may be an update, or known fix put out by the manufacturer that can save you from wasting time and money.
Next, see if there are any other diagnostic fault codes. Diagnose current faults first, in the order in which they are stored. Misdiagnosis occurs when this code is diagnosed when it is a stored code, especially while other codes are active. If these codes are present, diagnose them before attempting to diagnose the P1135.
If the P1135 is the only active fault code present, and there are no updates/TSBs for your particular vehicle, then the next step is to locate the Pedal Position Sensor (PPS) on your particular vehicle. Once located, visually inspect the connectors and wiring. Look for the obvious damage to the connector. Note any chafing, rubbing, bare wires, burn spots or melted plastic. If there is damage to the wiring to the point of bare wires touching the frame or to a ground (bare metal spot on the vehicle), replace the sensor.
If you replaced the sensor and have a scan tool, clear the diagnostic trouble codes from memory, and see if this code returns. If the P1135 does not return, then the connections/wiring issues were most likely your problem.
If the P1135 code does return, further testing will be required. We will need to test the Pedal Position Sensor (PPS). The easiest way of doing this is to monitor the voltage signals from the Pedal Position Sensor (PPS) as you drive the vehicle down the road as it is acting up. It is very important to note that as you should use a co-pilot in a situation like this. Have someone drive the vehicle while you watch the scan tool. Monitor the APPS “A” PID and note if it drops out as you hit bumps in the road. This would help to isolate it as an intermittent connection somewhere else, somewhere you haven’t looked yet.
If all tests have passed so far, and you continue to get a P1135 code, you may want to seek assistance from a trained automotive diagnostician. And remember, PCMs must be programmed, or calibrated to the vehicle in order to be installed correctly.
Codes Related to P1135
P0120 and P0220 – Throttle Position Sensor (TPS) “A” or “B” Voltage Wide Fluctuation — If the voltages from these sensors are also being fed to the Pedal Position Sensors, this may account for the P1135.
Other Manufacturer Specific Definitions for P1135Pedal Position Sensor 'A' Circuit Intermittent (Ford)
HO2S Lean Mean Bank 1 Sensor 1 (GM)
Heated oxygen sensor (H02S) – LH front – heater circuit malfunction (Toyota)
HO2S Heater Circuit- Bank 1 & 2 Sensor 2 Electrical Malfunction (Volkswagen)
HO2S Heater Circuit- Bank 1 & 2 Sensor 2 Electrical Malfunction (Audi)
Knock sensor (KS) 2, bank 1 – low input (BMW)
HO2S Lean Average Bank 1 Sensor 1 (Buick)
HO2S Lean Average Bank 1 Sensor 1 (Cadillac)
HO2S Lean Mean Bank 1 Sensor 1 (Chevrolet)
Glow Plug Control Module Voltage Supply Concern (Chrysler)
Glow Plug Control Module Voltage Supply Concern (Dodge)
Injection Timing Servo (Hyundai)
Intake valve timing control solenoid, bank 2 – malfunction (Infiniti)
Crankshaft position (CKP) sensor (Jaguar)
Heated oxygen sensor (H02S)- LH front- heater circuit malfunction (Lexus)
Heated oxygen sensor (H02S) 1, bank 1, heater control – circuit low (Mazda)
O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 1 (Mini)
Camshaft position (CMP) actuator- bank 1 – circuit malfunction (Nissan)
Heated oxygen sensor (H02S) 1, bank 1 – heater low input (Saab)
Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1 (Scion)
Front Left Oxygen Sensor Circuit Open (Subaru)
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