Software not upgraded.
As described in the diagnostic trouble code information, this code is designed to monitor whether airflow to the engine is within permitted limits. The diagnostic trouble code is pretty much always stored as the result of another trouble code in the engine control module (ECM). Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate a problem with airflow into the engine.
If any other diagnostic trouble code has been stored that indicates a problem with the air flow sensor and/or the induction pipe pressure sensor, this indicates that there may have been a problem with the airflow. Any diagnostic trouble codes that are stored should be fault traced first. If ECM-1300, ECM-130A, ECM-1400, ECM-140A and/or ECM-150A are stored, fault trace these diagnostic trouble codes.
If other diagnostic trouble codes have been stored that indicate a communication fault on the CAN network, it indicates that trouble code ECM-980F/ECM-900E, Faulty signal 12, may have been stored because the engine control module (ECM) did not have correct information on throttle position when permitted air flow was calculated. If ECM-901A, ECM-902A, ECM-911A, ECM-912A and/or ECM-E000 are stored, fault trace these diagnostic trouble codes.
If other diagnostic trouble codes have been stored that indicate a problem with the throttle unit or its throttle control, this indicates that there may have been a problem with the airflow. Any diagnostic trouble codes that are stored should be fault traced first. If ECM-903F, ECM-914F, ECM-9150, ECM-9160, ECM-9190 and/or ECM-91A7 are stored, fault trace these diagnostic trouble codes.
Model year 2001-2002.
If ECM-980F is stored together with ECM-9818, but none of the above diagnostic trouble codes are stored, use the trouble code's frozen values and the counter to determine the operating conditions when the fault was first detected and how often the fault occurred. The values show the problem's current status and how intermittent the problem is.
If the frozen values indicate that both diagnostic trouble codes were stored at about the same time, just after the engine started, when the air mass into the engine seems OK but the pressure in the induction pipe is the same as the air pressure around the vehicle, this is a fault detection and not a problem with airflow.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. This is because the upgraded software requires that the air mass measured by the mass air flow sensor must be sufficiently greater than the calculated air mass for the diagnostic trouble code to be generated. This makes it more tolerant to disturbances such as this one.
See Identifying upgraded software ECM/ETM
For markets in which upgraded software is not available, check if there is any reason why the pressure sensor did not indicate that pressure in the induction pipe was much lower than air pressure when the diagnostic trouble code was generated.
- Check vacuum hoses and connections between the pressure sensor and induction pipe for clogs, condensation and dirt.
If ECM-980F/ECM-900E, Faulty signal 12, is stored alone without any of the above diagnostic trouble codes, use the trouble code's frozen values plus the counter to determine the operating conditions when the fault was first detected and how often the fault occurred. The values show the problem's current status and how intermittent the problem is.
- Check whether there are any other indications that there could have been incorrect airflow.
- Check for air leaks between the throttle unit and the cylinder head.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. This is because the upgraded software requires that the air mass measured by the mass air flow sensor must be sufficiently greater than the calculated air mass for the diagnostic trouble code to be generated.
Model year 1999-2000:
If ECM-980F/900E, Faulty signal 12, is stored alone, but none of the above diagnostic trouble codes are stored, use the trouble code's frozen values and the counter to determine the operating conditions when the fault was first detected and how often the fault occurred. The values show the problem's current status and how intermittent the problem is.
If the frozen values indicate that both diagnostic trouble codes were stored at about the same time, just after the engine started, when the air mass into the engine seems OK but the pressure in the induction pipe is the same as the air pressure around the vehicle, this is a fault detection and not a problem with airflow.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. This is because the upgraded software requires that the air mass measured by the mass air flow sensor must be sufficiently greater than the calculated air mass for the diagnostic trouble code to be generated. This makes it more tolerant to disturbances such as this one.
For markets in which upgraded software is not available, check if there is any reason why the pressure sensor did not indicate that pressure in the induction pipe was much lower than air pressure when the diagnostic trouble code was generated.
- Check vacuum hoses and connections between the pressure sensor and induction pipe for clogs, condensation and dirt.
If the frozen values indicate that ECM-980F/ECM-900E, Faulty signal 12, was not stored directly after engine start, use the diagnostic trouble code's frozen values and the counter to determine the operating conditions when the fault was first detected and how often the fault has occurred. The values show the problem's current status and how intermittent the problem is.
- Check whether there are any other indications that there could have been incorrect airflow.
- Check for air leaks between the throttle unit and the cylinder head.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. This is because the upgraded software requires that the air mass measured by the mass air flow sensor must be sufficiently greater than the calculated air mass for the diagnostic trouble code to be generated. This makes it more tolerant to disturbances such as this one.
Other information
- See Check for air leaks in the intake system
- See Identifying upgraded software ECM/ETM
- See Checking wiring and terminals
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