DTC Troubleshooting: P16BC
  1. Check for continuity between alternator 4P connector terminal No. 4 and ECM/PCM connector terminal B47.
Is there continuity?
YES -
Go to Step 27 .
NO -
Repair open in the wire between the ECM/PCM (B47) and the alternator, then go to Step 18 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Do the ECM/PCM idle learn procedure.
  1. Start the engine.
  1. Check under these conditions:
    • A/C on
    • Temperature control at maximum cool
    • Blower fan at maximum speed
    • Rear window defogger on
    • Headlights on high beam
  1. Hold the engine speed 2,000 rpm (min −1 ) (A/T in P or N, M/T in neutral) for 1 minute.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16BC indicated?
YES -
Check for poor connections or loose terminals at the alternator and the ECM/PCM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
  1. Start the engine.
  1. Check under these conditions:
    • A/C on
    • Temperature control at maximum cool
    • Blower fan at maximum speed
    • Rear window defogger on
    • Headlights on high beam
  1. Hold the engine speed 2,000 rpm (min −1 ) (A/T in P or N, M/T in neutral) for 1 minute.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16BC indicated?
YES -
Check for poor connections or loose terminals at the alternator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 29 . If the ECM/PCM was substituted, go to Step 1 .
NO -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■