Thunderbird V8-281 4.6L SOHC (1994)
Install pressure gauges (0-300 psi) on the forward and direct clutch pressure taps (Figure 3) to monitor and record hydraulic system pressures. Also
install the Rotunda New Generation Star Tester (NGS 007-00500), Service Bay Diagnostic System (SBDS 001-00001) or equivalent equipment to
monitor and record the following transmission control system inputs/outputs:
^
PCM gear command
^
Throttle position
^
Engine RPM
^
Mass air flow
^
Vehicle speed
^
Transmission fluid temperature
^
OSS sensor voltage
^
PRNDL position
^
TR/MLP sensor voltage
Road test vehicle under the conditions at which the customer described as being present when the concern occurred (i.e., the first shift in the morning,
after driving 20-30 minutes, heavy throttle shifts, etc.). If the concern does not occur, let the vehicle sit outside overnight and repeat the test drive with
cold transmission fluid. Continue to drive the vehicle until the transmission fluid temperature reaches at least 150~F (65~C). Monitor and record the
sensor signals and hydraulic pressures as stated earlier in this article. After completing the test drive, use the following charts (Figures 1 and 2) to help
diagnose and correct the customer's concern.
