DTC Troubleshooting: P16BC (116)
DTC P16BC:
 Alternator FR Terminal Circuit/IGP Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Check for poor connections or loose terminals at the alternator 4P connector.
Are the connections and terminals OK?
YES -
Go to Step 2 .
NO -
Repair the connector or terminals, then go to Step 18 .
  1. Check the alternator mounting surface for corrosion.
Is the mounting surface corroded?
YES -
Remove the alternator. Clean all mounting surface and reinstall the alternator, then go to Step 18 .
NO -
Go to Step 3 .
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  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 ) (in neutral) for 1 minute.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16BC indicated?
YES -
Go to Step 9 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the ECM.■
  1. Turn the ignition switch OFF.
  1. Disconnect the alternator 4P connector.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between alternator 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to Step 13 .
NO -
Repair open in the wire between the alternator (IG1 line) and the No. 3 ALTERNATOR (10 A) fuse in the under-dash fuse/relay box, then go to Step 18 .