Diagnostic Aids

NOTE: If this code IS NOT displayed during the third pass of diagnostic codes, it is an intermittent failure and cannot be diagnosed using this procedure . For an intermittent code, refer to NOTE ON INTERMITTENTS.

The ECM supplies a 5 volt signal to pin C (circuit 474) of the Barometric pressure (BARO) sensor and supplies a ground path to pin A (circuit 476-X). The BARO signal from pin B (circuit 433) is a variable voltage which is dependent on the barometric pressure.

Trouble Code 35 indicates that the voltage signal from the BARO sensor is too high. This situation can be observed in engine data display as a "BARO" reading (parameter .0.3) of 106 to 108 kPa. Possible causes of this condition are:

A. Defective BARO sensor.
B. Defective wiring, terminals, etc.
C. An ECM which is unable to properly process signals.

If the opposite condition (low BARO signal) can be created, then the self-diagnostics can be used to detect this failure by displaying engine data parameter .0.3. With the opposite condition created, parameter .0.3 should display a "BARO" reading of 14 to 16 kPa. To create a low sensor signal, disconnect the BARO sensor connector. If the "BARO" reading is 14 to 16 kPa, then the problem must be a faulty BARO sensor. If the "BARO" reading is 17 kPa degrees or greater, then there is a short to voltage in the wiring or the ECM.