P1793
DTC P1793: Problem in Manifold Absolute Pressure Sensor CircuitULEV Model
NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.
1. Check whether the scan tool or the HDS indicates a code for the manifold absolute pressure (MAP) sensor in the fuel and emissions system.
Does the scan tool or the HDS indicate a code for MAP sensor?
YES- Do the DTC Troubleshooting for the MAP sensor circuit. Recheck for DTC P1793 after troubleshooting.
NO- Go to step 2.
2. Turn the ignition switch OFF.
3. Disconnect TCM connectors A (31P) and C (17P).
4. Turn the ignition switch ON (II).
5. Measure the voltage between TCM connector terminals C14 and A23 or A24.
Is there about 5 V?
YES- Go to step 6.
NO- Repair open or short in VREF wire between TCM connector terminal C14 and the ECM.
6. Measure the voltage between TCM connector terminals C10 and A23 or A24.
Is there about 2.8 V?
YES- Check the terminal fit at TCM connector terminal C10. ,If the connection is OK, update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM
NO- Repair open in the wire between TCM connector terminal C10 and the MAP sensor.