CODE 32 - BARO SENSOR Pontiac Firebird III

CODE 32 - BARO SENSOR

Note. The BARO sensor reacts like a MAP sensor in that it measures highest voltage when barometric pressure is highest.

Code 32 says that the ECM has seen a BARO pressure (measured in volts) too low at terminal "1" of the ECM.

Note. The following step numbers refer to the numbers in the accompanying flow chart(s).

1. This test checks voltage output from sensor at the ECM. Voltage normally falls within the middle range on table.
2. Installing a jumper lead between Baro sensor harness terminals "B" and "C" should cause a voltage reading of more than 2.5 volts at the ECM. This indicates circuits 416 and 432 are okay.
3. Possible causes of low voltage in step 2) are checked by measuring voltage between Baro harness terminal "A" and "C". A voltage reading of 4-6 volts limit possible causes to be an open circuit 433, a poor connection at ECM terminal "1" or a faulty ECM.
4. This test verifies the presence of reference voltage at Baro harness terminal "C".

Code 32 - Baro Sensor Flow Chart. Scheme 393

Code 32 - Baro Sensor Flow Chart. Scheme 394

Code 34 indicates the ECM has seen the following

1. Pressure outside a specified voltage range (seen by ECM as voltage at terminal "20").
2. Engine RPM less than a given value.
3. Engine at operating temperature.
4. All the above for a time greater than specified.

Note. The following step numbers refer to the numbers in the accompanying flow chart.

1. This tests output of sensor at idle to determine if sensor is within specification. Normal sensor will read .59-.64 volts with key in the "ON" position and engine not running.
2. Signal voltage should read over 2 volts with engine idling with a minimum of 15 in. Hg vacuum.
3. If voltage reads between 4-6 volts, VAC sensor is faulty.
4. Low voltage indicates a faulty circuit 416.

Code 34 - Diff. Press. (VAC) Sensor Flow Chart - 1986 Models. Scheme 395

Code 34 - Diff. Press. (VAC) Sensor Flow Chart - 1986 Models. Scheme 396

Code 34 indicates the ECM has seen the following

1. Pressure outside a specified voltage range (seen by ECM as voltage at terminal "20").
2. Engine RPM less than a given value.
3. Engine at operating temperature.
4. All the above for a time greater than specified.

Note. The following step numbers refer to the numbers in the accompanying flow chart.

1. This tests output of sensor at idle to determine if sensor is within specification. Normal sensor will read .59-.64 volts with key in the "ON" position and engine not running.
2. Signal voltage should read over 2 volts with engine idling with a minimum of 15 in. Hg vacuum.
3. If voltage reads below 2 volts and adequate vacuum was available, the VAC sensor is faulty.
4. If voltage remains over 0.5 volts with the sensor harness disconnected the fault is in the harness or ECM. Low voltage indicates a faulty vacuum sensor.
5. If voltage remains low when harness terminals B and C are jumpered together the faulty is in the harness or ECM. High voltage indicates a faulty vacuum sensor.

Code 34 - Diff. Press. (VAC) Sensor Flow Chart - 1987 Models. Scheme 397