DTC Troubleshooting: P0670 (173)
DTC P0670:
 Lost Communication with Glow Plug Control Module (With DPF System)
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Do the GLOW ON/OFF in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0670 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the glow plug control module and the ECM.■
  1. Turn the ignition switch OFF.
  1. Disconnect the glow plug control module 11P connector.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between glow plug control module 11P connector terminal No. 6 and body ground.
Is there battery voltage?
YES -
Go to Step 9 .
NO -
Repair open in the wire between PGM-FI main relay 2 and the glow plug control module, then go to Step 24 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 2 (58P).