Checking Components And Connections
5-cyl. non-turbo engines
Diagnostic trouble code ECM-9180 is always stored together with ECM-918F. Fault trace for ECM-918F.
Turbo engines and 6-cyl non-turbo engines
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. 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.
If, for example, diagnostic trouble code (DTC), ECM-9520 is stored and it was stored at approximately the same time as ECM-9180, this indicates that the Engine control module (ECM) and Electronic throttle module (ETM) have detected a problem with the pulse width modulated (PWM) signal 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-959F is stored together with ECM-9180 and ECM-958F is not stored, this indicates that the Engine control module (ECM) has detected that the pulse width modulated (PWM) signal is OK, but that the Electronic throttle module (ETM) has detected that the signal is incorrect. Due to this, it is possible to determine if the fault has occurred for longer than 0.5 seconds (1 second for upgraded software), because the signal from the Electronic throttle module (ETM) must be incorrect for more than 0.5 seconds, for ECM-959F to be stored.
- Check the cable between Engine control module (ECM) terminal #A56 (#A56) and Electronic throttle module (ETM) terminal #1. Check for an open-circuit.
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. This can depend on whether the engine has been started or not when the fault was detected. If the engine speed was at 0 RPM in the frozen values, this indicates that the fault has been stored for longer than 0.1 seconds, but for less than 0.4 seconds, otherwise ECM-958F would have been stored. If, however the frozen values show that the engine speed was greater than 0 RPM, when the fault occurred, this indicates that the signal that the Engine control module (ECM) receives is OK. Otherwise ECM-9520 would have been stored together with ECM-9180.
- Check the cable between Engine control module (ECM) terminal #A56 (#A56) and Electronic throttle module (ETM) terminal #1. Check for an intermittent open-circuit.
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
Refer to Information