Faulty Signal - Permanent Fault

ECM-170F ATMOSPHERIC/BOOST PRESSURE SENSOR RANGE CHECK
FAULTY SIGNAL - PERMANENT FAULT

Checking connector



- Ignition off
- Check boost pressure sensor connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read boost pressure and atmospheric pressure.
- The difference in pressure should not be greater than 140 hPa (2.0 psi).

If the difference is less than 140 hPa (2.0 psi) it means that the cause of the fault has been loose connections in the connector.

Other information
- Normal atmospheric pressure is 1013 hPa (14.7 psi).
- To access/replace the boost pressure sensor, Manifold Absolute Pressure (MAP) Sensor, Replacing

Is the difference between the pressures less than 140 hPa? (2.0 psi)
Yes - Testing Complete.
No - Continue below.


Replacing component



If the difference between the pressures is greater than 140 hPa (2.0 psi), try replacing the boost pressure sensor according to Manifold Absolute Pressure (MAP) Sensor, Replacing

Hint: Normal atmospheric pressure is 1013 hPa (14.7 psi). Check which of the sensors appears to display the incorrect reading.

If the fault is not in the boost pressure sensor, replace the engine control module (ECM) according to Engine Control Module (ECM), Replacing

NOTE: The atmospheric pressure sensor is built into the engine control module (ECM) and therefore cannot be replaced as a separate item.

CAUTION!
A new engine control module (ECM) is delivered without software. For the engine control module (ECM) to function after replacement the engine control module (ECM) must be programmed.

Remedy as necessary.

Other information
- Normal atmospheric pressure is 1013 hPa (14.7 psi).
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Read boost pressure sensor pressure and atmospheric pressure sensor pressure.
- The difference between the pressure sensors should not be greater than 140 hPa.

Is the difference between the pressure sensors less than 140hPa?
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.