Checking The Components And Wiring
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
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see ENGINE CONTROL MODULE (ECM)
- To access or replace the pressure sensor for the inlet manifold:LOCATION OF COMPONENTS, ENGINE COMPARTMENT
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION