Faulty Signal

ECM-100A ENGINE CONTROL MODULE (ECM), INTERNAL FAULT
FAULTY SIGNAL

Determining the status
Reading off Diagnostic trouble code (DTC) status ECM-100A




Note! When reading off the diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

- Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).

Was the status of the relevant diagnostic trouble code (DTC) permanent?
Yes - Continue below.
No - Skip to "1. Checking the connectors"


Checking the connectors
- Ignition off
- Check the connector for the intake manifold pressure sensor for contact resistance and oxidation. [1][2]Checking Wiring and Terminals. Permanent Fault

- Reinstall the components, reconnect the connectors etc.

Other information
- To locate the manifold absolute pressure (MAP) sensor, Locations
- To access and replace the engine control module (ECM), Engine Control Module (ECM), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters

Has the fault been found and remedied?
Yes - Skip to "Verification"
No - Continue below.


Checking the pressure sensors
- Ignition on
- Read off both the pressure in the intake manifold and the atmospheric pressure
- Compare the read off values. The difference between these values must not be greater than 70 hPa.

If the difference between the read off pressure values is less than 70 hPa, the cause of the fault was loose connections in the connector.
If the difference is in excess of 70 hPa, check which of the sensors probably gave an incorrect value.

Other information
- To locate the pressure sensors, Locations
- Normal atmospheric pressure is 1013 hPa.

Select an alternative
1. The difference between the read off pressure values is < 70 hPa
2. The atmospheric pressure sensor seems to be faulty
3. The manifold absolute pressure (MAP) sensor seems to be faulty.

Which alternative is correct?
1 - Continue below.
2 - Skip to "2. Replacing the atmospheric pressure sensor"
3 - Skip to "3. Replacing the manifold absolute pressure (MAP) sensor"


1. Checking the connectors
Check the pressure sensor connector for intermittent contact resistance and oxidation. [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information
- To locate the manifold absolute pressure (MAP) sensor, Locations
- To access and replace the engine control module (ECM), Engine Control Module (ECM), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
--Testing Complete--


2. Replacing the atmospheric pressure sensor
Replace the engine control module (ECM). See Replacing the engine control module (ECM).

Note! The atmospheric pressure sensor is built into the engine control module (ECM) and cannot be replaced separately.

Caution! New engine control modules (ECM) are supplied without software. The engine control module (ECM) must be programmed when it has been replaced.

Remedy as necessary.

Skip to "Verification"


3. Replacing the manifold absolute pressure (MAP) sensor
To locate the manifold absolute pressure (MAP) sensor, Locations

Remedy as necessary.

Other information
- For information about signals, Pinout Values and Diagnostic Parameters
- For the normal values for the manifold absolute pressure (MAP) sensor, Manifold Absolute Pressure (MAP) Sensor

Skip to "Verification"


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off the value for the manifold absolute pressure (MAP) sensor and the value for the atmospheric pressure sensor
- The difference between these values must not be greater than 70 hPa.

Is the difference between the pressure sensors less than 70 hPa?
Yes - Testing Complete
No - Continue Below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.