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I take it you tried swapping the STPS and TPS because you were having a problem. Indications are you had a bad TPS and it is now malfunctioning in the STPS position.
A C28 is caused by the following:
1.When no actuator control signal is supplied from the ECM or
communication signal does not reach ECM or operation voltage
does not reach STVA motor, C28 is indicated. STVA can not
operate.
2. STVA lead wire/coupler.
A C29 means an STPS problem.
1. The sensor should produce following voltage.
0.1 V sensor voltage 4.8 V
Without the above range for 4 sec. and more, C29 is indicated.
2.Secondary throttle position sensor, lead wire/coupler connection.
A C28 is caused by the following:
1.When no actuator control signal is supplied from the ECM or
communication signal does not reach ECM or operation voltage
does not reach STVA motor, C28 is indicated. STVA can not
operate.
2. STVA lead wire/coupler.
A C29 means an STPS problem.
1. The sensor should produce following voltage.
0.1 V sensor voltage 4.8 V
Without the above range for 4 sec. and more, C29 is indicated.
2.Secondary throttle position sensor, lead wire/coupler connection.