Part 2 (Trans Range Switch Check - 4T60E Trans)

Diagnostic Chart C-1A (2 Of 2, 4T60E Trans):

Trans Range Switch Electrical Schematic (4T60E Trans):

CIRCUIT DESCRIPTION
The transmission range switch is part of the Transmission Neutral Start Switch (TMNSS) mounted on the transaxle assembly. It is a multi-signal switch sending information indicating gear selector position to the PCM. The transmission range switch uses 4 discrete circuits to pull 4 PCM voltages low in various combinations to indicate each gear range. The voltage level of each of the circuits is represented as LOW = grounded circuit, HIGH = open circuit. The 4 states displayed represent decoder P, A, B and C inputs in sequence.


TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. & 2. These steps check for proper operation of the transmission range switch.
2. This test checks for an open or grounded circuit.

NOTE: When a fault is present, the PCM assumes selector in "D4" position until a correct combination is received by the PCM. Therefore, some gear select positions may not be possible until the fault is repaired.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.
^ Poor Connection or Damaged Harness - Inspect PCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
^ Intermittent Test - Monitor a Tech 1 while moving related connectors and wiring harness. If the failure is induced, the scan data will change from "LOW" to "HIGH" or "HIGH" to "LOW." Moving the gear selector slowly through each gear position while monitoring the PRNDL status with the Tech-1 may locate a faulty switch. This may help to isolate the location of the malfunction.