Mazda CX-9 Grand Touring 2009 Manual page 1144

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P0620 [MZI-3.7]
DTC P0620 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0620
DETECTION
CONDITION
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
Generator control circuit
The PCM reads the generator and sends a DTC through the network when the
generator indicates a concern.
Drive belt misadjustment
Generator malfunction
Open circuit between generator terminal LI and PCM terminal 2AG
Open circuit between generator terminal B and battery positive terminal
Short to ground between generator terminal LI and PCM terminal 2AG
Short to power supply between generator terminal LI and PCM terminal 2AG
Connector or terminal malfunction
PCM malfunction