Flow Chart 24B - Park/Neutral Circuit (P/N)
The P/N switch is closed when the gear selector is in Park or Neutral. One side of the switch is connected to the ECM which supplies a buffered 12 volts, the other side is grounded. The P/N switch is an input to the ECM. When the voltage at ECM term. "H" is high (12 volts), the ECM allows activation, at the proper time, of other controls such as TCC, EST, VSS and others.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- This test checks for good P/N circuit. When the switch is closed in Park and Neutral, the voltage across the P/N switch terminals should be low, usually less than 1 volt. When the switch is open in Drive and Reverse, voltage should be about battery voltage.
- This step separates a faulty switch, or switch adjustment, from a faulty electrical circuit or ECM. Normal voltage across the terminals of the connector, when removed from the P/N switch, should be about battery voltage.