Signal Too High. Permanent Fault

Checking Power Cable
- Ignition OFF.
- Disconnect accelerometer.
- Ignition ON.
- Connect a voltmeter between accelerometer connector terminal 1 and ground.
- The voltmeter should read 5 Volts.

If reading is OK:
^ Proceed to: Checking Ground Lead section below.

If value is lower:
^ Proceed to: Checking Power Cable Resistance To Ground section below.

If value is higher:
^ The accelerometer power cable is connected to the air conditioning (A/C) pressure sensor power cable inside the engine control module (ECM). If anything happens to either of these cables both will be affected. Air conditioning pressure sensor wiring is pre-routed, even on cars without one, and should always be checked.
^ Check cables between Accelerometer terminal 1 and engine control module # B1 air conditioning pressure sensor terminal 3 and engine control module # B29 for a short-circuit to supply voltage.
^ Proceed to: Verification section below.





Checking Ground Lead
- Ignition OFF.
- Accelerometer disconnected.
- Connect an ohmmeter between accelerometer connector terminal 2 and ground.
- The ohmmeter should read approx. 0 ohms.

If reading is OK:
^ Proceed to: Checking The Signal Cable section below.

If reading is incorrect:
^ Proceed to: Checking Engine Control Module Connector section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Accelerometer disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Connect an ohmmeter between accelerometer connector terminal 2 and ground.
- The ohmmeter should read approx. 0 ohms.

If reading is OK:
^ The cause of the diagnostic trouble code (DTC) has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between accelerometer terminal 2 and engine control module # B28 for an open-circuit.
^ Proceed to: Verification section below.





Checking The Signal Cable
- Ignition ON.
- Accelerometer disconnected.
- Connect a voltmeter between accelerometer connector terminal 3 and ground.
- The voltmeter should read approx. 5 Volts.

If reading is OK:
^ Proceed to: Checking Accelerometer section below.

If value is lower:
^ Proceed to: Checking Engine Control Module Connector section below.

If value is higher:
^ Check cable between accelerometer terminal 3 and engine control module # B32 for a short-circuit to supply voltage.
^ Proceed to: Verification section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Accelerometer disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Ignition ON.
- Connect a voltmeter between accelerometer connector terminal 3 and ground.
- The voltmeter should read approx. 5 Volts.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between accelerometer terminal 3 and engine control module # B32 for an open- circuit.
^ Proceed to: Verification section below.





Checking Accelerometer
- Ignition ON.
- Connect the accelerometer.
- Start the engine and idle it.
- Wait 1 minute.
- Read off diagnostic trouble codes. If EFI-444 is stored it should have intermittent status.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the accelerometer connector.
^ Check connector for contact resistance and oxidation and remedy.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Try a new accelerometer.
^ Proceed to: Verification section below.





Checking Power Cable Resistance To Ground
- Ignition OFF.
- Accelerometer disconnected.
- Wait for approx. 150 seconds (cars with immobilizer 245 seconds).
- Connect an ohmmeter between accelerometer connector terminal 1 and ground.
- Does the ohmmeter read approx. 0 ohms?

Yes:
^ Proceed to: Check section below.

No:
^ Proceed to: Checking Engine Control Module Connector section below.

Check
- Car variant?

Alternative A/C:
^ The car has air conditioning.
^ Proceed to: Checking The Air Conditioning Pressure Sensor section below.

Alternative Ingen A/C:
^ The car does not have air conditioning.
^ Proceed to: Checking For A Short-circuit To Ground section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Accelerometer disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Connect an ohmmeter between accelerometer connector terminal 1 and ground.
- The ohmmeter should read approx. 0.2 - 1.5 k ohms.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between accelerometer terminal 1 and engine control module # B1 for an open-circuit.
^ Proceed to: Verification section below.





Checking The Air Conditioning Pressure Sensor
- Ignition OFF.
- Accelerometer disconnected.
- Disconnect the air conditioning pressure sensor.
- Connect an ohmmeter between accelerometer connector terminal 1 and ground.
- The ohmmeter should read 0.2 - 1.5 k ohms.

If reading is OK:
^ Try a new air conditioning pressure sensor.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Proceed to: Checking For A Short-circuit To Ground section below.





Checking For A Short-circuit To Ground
- The accelerometer power cable is connected to the air conditioning pressure sensor power cable inside the engine control module. If anything happens to either of these cables both will be affected. Air conditioning pressure sensor wiring is pre-routed, even on cars without air conditioning, and should always be checked.

Check cables between:
- Accelerometer terminal 1 and engine control module # B1.
- Air conditioning pressure sensor terminal 3 and engine control module # B29 for a short-circuit to ground.
- Proceed to: Verification section below.





Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition OFF.
- Accelerometer and, if necessary, air conditioning pressure sensor and fuel tank pressure sensor connected.
- Start the engine and idle it.
- Go into scrolling values.
- Read off accelerometer signal.
- The value should be approx. 2.5 Volts.

If reading is OK:
^ Fault corrected.

If reading is incorrect:
^ Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected.

No:
^ Proceed to: Checking Power Cable section above.