DTC Troubleshooting: P1549 (34) (R18A: M/T)

DTC Troubleshooting: P1549 (34)

DTC P1549:  Charging System High Voltage


NOTE:

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine.

4.Check under these conditions:
  • A/C off
  • Headlights off
  • Rear window defogger off

5.Hold the engine speed at 2,000 rpm (min-1) (in Park or neutral) for 1 minute.

6.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P1549 indicated?


YES - Replace the alternator, then go to 7.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.n


7.Turn the ignition switch ON (II).

8.Reset the ECM/PCM with the HDS.

9.Do the ECM/PCM idle learn procedure.

10.Start the engine.

11.Check under these conditions:
  • A/C off
  • Headlights off
  • Rear window defogger off

12.Hold the engine speed at 2,000 rpm (min-1) (in Park or neutral) for 1 minute.

13.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1549 is indicated, check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n