P0A08

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PINPOINT TEST 4: DTCs P0A08, P0A09, P0A10, P0A11, P0A12 AND P0A13 - HYBRID

Normal Operation

The PCM controls the DC/DC enable hardwired signal to switch the DC/DC converter on and off. The DC/DC converter provides feedback to the PCM using the hardwired DC/DC fault signal. The DC/DC fault signal indicates to the PCM when the converter is non-operational or when a fault has occurred.





Possible Causes
- DC/DC converter
- High-voltage cable assembly
- PCM
- Electronically controlled continuously variable transmission (ECVT)
- DC/DC converter high-voltage wire harness
- Wiring, terminals or connectors

Diagnostic Procedure

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.

CAUTION:Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE:The 12-volt battery must be sufficiently charged before carrying out any DC/DC converter system diagnostics.
NOTE:The high voltage traction battery (HVTB) must be at a minimum state of charge of 35% in order for the PCM to activate the DC/DC converter enable circuit in the KOER position.
NOTE:DTC P0A09 set alone as a continuous memory diagnostic trouble code (CMDTC) indicates an intermittent DC/DC fault circuit failure or that battery voltage has dropped below a preset limit.

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