Igot a call from a technician who was working on a 4T65-E.
It seems that after the freshly rebuilt transmission was re-installed,
the car would not start in park or neutral and the transmission would
make a wrong-gear start and shift only once. I came to find out that this
was not an original problem, which means it was created during the repair
process. First, we checked for codes; there were none. Then we checked
our data list on the scan tool, first looking at solenoid command. Sure
enough, the transmission was being told to do what it was doing. It couldn’t
be the transmission-fluid pressure-switch assembly. It had nothing to
do with starting the car in the correct gearshift position. Let’s
see – we had no shift-solenoid circuit codes, or any other codes
for that matter; how about the park/neutral switch?Sure enough, when ranges
A, B, C and P were checked, they were all over the place any time the
gearshift lever was moved, as shown in the scan-tool screen capture in
Figure 1. The chart in Figure 2 shows the correct ranging for the IMS,
which can be seen on the scan-tool data list.
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