DTC 64

DTC 63/64 Baro Sensor Circuit High/Baro Sensor Circuit Low:

BARO Sensor Circuit:

CIRCUIT DESCRIPTION
The Transmission Control Module (TCM) supplies 5 volts to the BARO sensor. As the atmospheric pressure changes the resistance within the BARO sensor also changes, modifying the voltage on the BARO sensor input signal. When atmospheric pressure is high (100 kPa) input signal voltage will also be high (approx. 4.5V). As atmospheric pressure decreases, so does the input signal voltage.

DTC 64 WILL SET WHEN
^ BARO sensor signal voltage less than 1.9 volts.
^ Longer than 2 seconds.

ACTION TAKEN (TCM will default to)
No altitude compensation of shift patterns.

DTC 64 WILL CLEAR WHEN:
Fault condition(s) no longer exist.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This verifies the 5 volt supply to the BARO sensor.
2. If the entire circuit is OK, the voltage measured will be 5 volts.

DIAGNOSTIC AIDS
If the DTC will not set, use snapshot mode on scan tool to trigger "ON" this DTC, then review data to identify source.