Faulty Signal
Faulty signal
DONE - Checking components
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Checking components
Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate a fault in the pulse width modulated (PWM) signal or the analogue signal from the accelerator pedal position sensor.
If ECM-9180, ECM-918F, ECM-9520, ECM-9530 and/or ECM-9540 are stored, these diagnostic trouble codes are to be fault traced first. Otherwise, continue as follows.
Using the diagnostic trouble code counter and parameters in VIDA vehicle communication, check whether the fault is intermittent or permanent. Compare the parameters "Accelerator pedal, Analogue (%)" and "Accelerator pedal, PWM (%)". These should under no circumstances differ by more than 5% unless the analogue signal is undergoing change, e.g. during throttle application, when a large deviation between the two signals is permitted.
Permanent fault
Search for a fault that could cause any of the signals to be faulty yet still within the electrical fault limits. Check the cables and connections between the accelerator pedal position sensor and the engine control module (ECM) for contact resistance and corrosion.
Check whether there is any potential difference for ground connections and voltage supplies between the engine control module (ECM) and the accelerator pedal position sensor.
Check the cables and connections between the grounding point and the accelerator pedal position sensor as well as between the system relay and the accelerator pedal position sensor.
Intermittent fault
Use the diagnostic trouble codes' frozen values as well as the counters, to determine the driving conditions when the problem was detected the first time and how often the problem has occurred. The values show the problem's current status and how intermittent the problem is. The operating conditions can be, for example, whether the engine was running, what the speed of the vehicle was and what the battery voltage in the system was. This information can facilitate searching for an intermittent fault.
Hint: Using VIDA vehicle communication, check that the parameters "Accelerator pedal, PWM (%)" and "Accelerator pedal, Analogue (%)" indicate correct values. There are other parameters that can be of help when fault tracing and verifying this diagnostic trouble code. To aid fault tracing, use Component specifications when measuring and checking relevant components and use Wiring diagram, Signal descriptionand Breakout boxto measure and control signals to and front the control module or its components.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. Since detection time has been increased from 0.4 to 0.7 seconds, the upgraded software will be much more tolerant to short, intermittent disruptions.
Remedy as necessary.
Other information
- To access or replace the system relay, see the location of components
- To access or replace the accelerator pedal (AP) position sensor:
- Checking wiring and terminals Checking Wiring And Terminals
Caution! In order for Electronic throttle module (ETM) to reset any reconfigurations as well as delete internally stored problems, the following must be performed:
- Ignition off, wait three minutes so that the main relay / system relay releases the voltage feed to, among other, Electronic throttle module (ETM).
- Then turn on the ignition and turn it off again.
- Wait another three minutes, but if the electric cooling fan is running you have to wait another two minutes after the cooling fan has stopped, to ensure that Electronic throttle module (ETM) is shut off correctly.
If this is not done correctly, diagnostic trouble codes may remain even after deleting diagnostic trouble codes and any reconfiguration may remain, despite the problem being fixed.
Continue - Information
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Information
Fault-Tracing Information
Fault-tracing is not followed by verification for this fault.
The information can be displayed again or fault-tracing this fault can be interrupted.
Do you want to view the information again?
YES: Repeat Procedure.
NO: Troubleshooting complete for this DTC.
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