Pinpoint Test D: Transmission Control Indicator Lamp (TCIL) Does Not Illuminate

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK THE TRANSMISSION CONTROL INDICATOR LAMP (TCIL) CIRCUIT FOR VOLTAGE
- Key in OFF position.
- Disconnect: Powertrain Control Module (PCM).
- Connect breakout box.
- Leave the PCM disconnected.
- Key in ON position.
- Measure the voltage between test pin 79 and test pins 24 and 76 at 104-Pin Breakout Box.
  
  Fig 1: Checking Transmission Control Indicator Lamp (TCIL) Circuit For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage reading greater than 2 volts?
1. Yes : INSTALL a new PCM. REMOVE 104-Pin Breakout Box. CYCLE the TCS to check the operation of the TCIL. TEST the system for normal operation.
2. No : CHECK the indicator bulb and the fuse.
  If OK, REPAIR wiring between the ignition switch and test pin 79 at the PCM harness connector. TEST the system for normal operation.