Faulty Signal

Faulty signal

Checking the components and wiring

Note! Check whether diagnostic trouble code (DTC) ECM-1000 for the internal atmospheric pressure sensor ECM-1000 has been stored. Check if one of diagnostic trouble codes (DTCs) ECM-140A or ECM-1400 for the manifold absolute pressure (MAP) sensor has been stored in the engine control module (ECM). If one of the diagnostic trouble codes (DTCs) has been stored, fault-tracing must first be carried out according to the fault-tracing instructions for the relevant diagnostic trouble code (DTC).




- Ignition on.
Activate reading the value from the manifold absolute pressure (MAP) sensor and the atmospheric pressure sensor.
Check the difference between the pressure readings. The difference must not be greater than 70 hPa.

Hint: The atmospheric pressure at normal sea level corresponds to approximately 1013 hPa.

If the difference is greater than 70 hPa, check the cables and connectors for the manifold absolute pressure (MAP) sensor. Check for contact resistance. Check for oxidation. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Check for an open-circuit.
Remedy as necessary.
If no fault can be detected in the cables or connectors, try a new manifold absolute pressure (MAP) sensor. Check the difference between the pressure readings.
The internal atmospheric pressure sensor in the engine control module (ECM) is damaged if the above checks have been carried out and the difference between the pressure readings is still greater than 70 hPa. The atmospheric pressure sensor is integrated in the engine control module (ECM). The atmospheric pressure sensor cannot be replaced as an individual component.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Engine control module (ECM) Engine Control Module (ECM)
- To access or replace the pressure sensor for the inlet manifold: Location of components, engine compartment Locations
- Checking wiring and terminals Checking Wiring and Terminals






Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Activate reading the value from the manifold absolute pressure (MAP) sensor and the atmospheric pressure sensor.
Check the difference between the pressure readings. Check that the difference is not greater than 70 hPa. The fault has been remedied if the difference is 70 hPa or less. The function is faulty if the difference is greater than 70 hPa.





Is the difference 70hPa or less?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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Fault-tracing information




Information

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.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the components and wiring

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