GM > Engine Diagnostics > General
General
- Firing Order: Engine Firing order, used for misfire detection
TPS Sensor
- P0121 Max MAP: The VCM will calculate an expected TPS position in two MAP ranges. If the MAP is less than MinMAP then it will use one table to calculated expected TPS, if MAP is greater than MaxMAP it will use a different TPS calculation table. To disable this test set MaxMAP to 100.
- P0121 Min MAP: The VCM will calculate an expected TPS position in two MAP ranges. If the MAP is less than MinMAP then it will use one table to calculated expected TPS, if MAP is greater than MaxMAP it will use a different TPS calculation table. To disable this test set MinMAP to 0.
- Calculated Airflow vs. TPS% vs. RPM - P1514/P0068 Error: The VCM uses this table to determine the maximum airflow/cylair the Electronic Throttle should be passing at a certain TPS position and RPM. If the measured cylair/airflow exceeds this value then P1514/P0068 is set.
Diagnostic Tests
- P0101, P0106, P0121 Min ECT: ECT must be above this for the tests to run.
- P0101, P0106, P0121 Max ECT: ECT must be below this for the tests to run.
- P0068 Enable RPM: RPM must be above this for the tests to run.