DTC 35

Fig. 24 Manifold absolute pressure sensor & barometric pressure sensor wiring circuit. 1984:

Fig. 25 Manifold absolute pressure sensor & barometric pressure sensor wiring circuit. 1985:

If this code is not displayed during the third pass of diagnostic codes, the problem is an intermittent failure. To help isolate the problem, manipulate related wiring while observing parameter .0.3. If failure is induced, BARO reading will jump from its normal value to a shorted reading of 106 to 108 kPa.
The ECM supplies 5 volts to pin C (circuit 474) of barometric pressure (BARO) sensor and supplies a ground path to pin A (circuit 476-X). The BARO signal from pin B (circuit 433) is variable voltage dependent on barometric pressure. Code 35 indicates that voltage signal from BARO sensor is too high. This can be observed in parameter .0.3 as a BARO reading of 106 to 108 kPa. Possible causes of this condition are:
a. Defective BARO sensor.
b. Defective wiring or electrical connections.
c. ECM unable to process signals properly.

To diagnose a Code 35, proceed as follows:
1. Turn ignition on, enter diagnostics and display parameter .0.3. Code 35 condition will be verified by a reading of 106-108 kPa.
2. Disconnect BARO sensor electrical connector and note parameter value.
3. If BARO reading is 14-16 kPa, replace BARO sensor.
4. If BARO reading is 17 kPa or greater, check circuit 433 for a short to voltage. If circuit is satisfactory, check for faulty ECM or ECM connector and repair or replace as necessary.