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 from the accelerator pedal position sensor.
If, for example, ECM-9520 has been stored at about the same time as ECM-918F, it indicates that both the engine control module (ECM) and the electronic throttle module (ETM) have detected a problem with the pulse width modulated signal (PWM) from the accelerator pedal position sensor. Then use the diagnostic trouble code (DTC) information from ECM-9520 to determine which type of fault cause could have caused the diagnostic trouble codes (DTCs).
If, however, ECM-951F is stored together with ECM-918F and ECM-950F is not stored, this indicates that the Engine control module (ECM) has detected that the pulse width modulated (PWM) signal from the accelerator pedal position sensor is OK, but that the Electronic throttle module (ETM) has detected that the signal is incorrect. Due to this, it is also possible to determine if the fault has occurred for longer than 1 second, because the signal from the Electronic throttle module (ETM) must be incorrect for more than 1 second, for ECM-951F to be stored.
If there is not another diagnostic trouble code (DTC) that indicates that the pulse width modulated (PWM) signal is incorrect stored, this means that the signal that reaches the Engine control module (ECM) is OK. It may also be the case that the fault is so short-term that the other diagnostics in the Engine control module (ECM) have not managed to detect the fault. For model years 1999-2001, if the frozen values indicate that the engine speed is greater than 0 RPM when the fault occurred, for example, this indicates that the signal that the Engine control module (ECM) receives is OK or that the fault is shorter than 0.3 seconds, otherwise ECM-9520 has been stored.
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. If the fault was stored at a battery voltage lower than 10 V with engine speed at 0 RPM, this indicates that the fault may have occurred when the engine was started. This, in turn, indicates that the battery's charging status is not OK.
- Check the battery status.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. As the detection time has increased from 0.1 to 0.9 seconds, the upgraded software becomes much more tolerant towards short intermittent interference among other things.
Remedy as necessary.
Other information
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. If the electric cooling fan is running, you have to wait another two minutes after the electric cooling fan has stopped, to make sure that Electronic throttle module (ETM) has been 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
See Information