P1784
DTC P1784: MAP Sensor Circuit Low Voltage2005 Model
NOTE:
^ Record all freeze data and review General Troubleshooting information before you troubleshoot.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Turn the ignition switch ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HDS.
Is about 101 kPa (760 mmHg, 30 inch Hg), or 2.9 V indicated?
YES- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor, the TCM, and at the ECM.
NO- Go to step 3.
3. Check the DTCs with HDS.
Is DTC P0107 indicated?
YES- Do the DTC Troubleshooting for the MAP sensor circuit low voltage. Recheck for DTC P1784 after troubleshooting.
NO- Go to step 4.
4. Disconnect the TCM connector B (22P) and ECM connector C (31P).
5. Check for continuity between MAP sensor connector terminal No. 3 and body ground.
Is there continuity?
YES- Repair short in the wire between the TCM (B2), and the MAP sensor.
NO- Substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.