Upgraded Software

Upgraded Software

As described in the diagnostic trouble code information, this trouble code is intended to monitor that the engine can supply the vehicle's brake servo with enough vacuum. Diagnostic trouble code ECM-4038/ECM-9818 is pretty much always stored as the result of another diagnostic 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 another diagnostic trouble code is stored that indicates a problem with the air flow sensor, induction pipe pressure sensor and/or air pressure sensor, this should be fault traced first. This is because information from the sensor is used as a basis for the diagnosis. If ECM-1000, ECM-100A, ECM-1300, ECM-130A, ECM-1400, ECM-140A and/or ECM-150A are stored, these diagnostic trouble codes are to be fault traced first.

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.

If diagnostic trouble code ECM-4038/ECM-9818 is stored alone or with ECM-980F/ 900E, Faulty signal 12, 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 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 a poor brake vacuum.
- Check for air leaks between the throttle unit and the cylinder head.

Other information
- Check for air leaks in the intake system
- See Identifying upgraded software ECM/ETM. Identifying Upgraded Software ECM/ETM
- 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. 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 Fault-Tracing Information - Interrupted Fault. Fault-Tracing Information - Interrupted Fault