DTC Troubleshooting: P16B1 (128)
DTC P16B1:
 A/C Clutch Relay Control Circuit Overheating
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Check the heat source around ECM
Is there heat source around ECM?
YES -
Remove the heat source, then go to Step 2 .
NO -
Go to Step 2 .
  1. Make a temperature in the cabin sufficiently low.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Turn the A/C switch on.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16B1 indicated?
YES -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO -
Intermittent failure, the system is OK at this time.■