replace TAC module
I am working on a 05 Isuzu NPR with 6L GM drivetrain. Both
the pedal sensor and the throttle body have been
substituted. The wiring was tested and each wire bypassed.
Extensive testing shows that the TAC module is outputting a
higher bias voltage on throttle sensor 1 vs sensor 2. This
causes the throttle to lockout (P2135)when the accelerator
is pushed about 3/4 travel, running or not. The scope shows
that the sensor voltages start out together and get farther
apart as the throttle opens. That same voltage difference is
on the sensor input leads of the TAC with the throttle
unplugged. It is a GM TAC module.
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2005 Isuzu NPR 6.0L