Operation Section
-92-
Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC Probable Fault Action Corrective Action, First Check
74 O2SensorSwitching
O2 sensor is not switching across
the reference AFR voltage
(G643E only)
Stored Fault Code
(MIL, Disable Adaptive
learns)
Note : If LP fuel in LP tank is not
enough, this fault code can be set. If
LP tank is frozen, this fault code can
be set, too. It is not system trouble.
Check the FTV for proper operation
z Check FTV Hose Connections
77 OxygenSensorInputHigh
O2 sensor SECM driver signal is
shorted to power
(G643E only)
Stored Fault Code
(MIL, Disable Adapts)
Check if O2 sensor is shorted to
+5VDC or Battery.
(AFRTrimValveLowerDC fault should
also occur)
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