Qt1 Carry Out The Network Test

WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

Carry out all the safety steps required to run the vehicle tests.
Complete the preliminary checks looking for obvious concerns that may relate to the symptom. Check items such as those listed:
- fuses
- electrical circuits and connectors
- vacuum lines (leaks, routing)
- air intake system (leaks, restrictions)
- fuel quality (octane, contamination, winter/summer blend)
- engine cooling system (engine operating at correct temperature)
- motor electronics cooling system
Access any related OASIS or TSB information.
Carry out the network test.
NOTE: If the scan tool being used does not support the network test, an alternative method is to attempt communication with each module on the controller area network (CAN) link.

Does the network test pass?

Yes	No
GO to Quick Test QT2 .	If only the PCM or the TCM has a communication concern: GO to PINPOINT TEST QA . All others: GO to the appropriate Module Communications Network article, to diagnose the network concern.