Ford Electric Ranger 2001 Manual page 395

414-02-3
DIAGNOSIS AND TESTING (Continued)
• DTC B1318 Battery Voltage - Low
— The interface adapter assembly (IAA) module
monitors the auxiliary battery voltage at pins
75, 76 (hot at all times). If the auxiliary
battery voltage decreases below 10 volts, the
IAA module generates DTC B1318 and enters
a limited operating mode where it will
attempt to close the auxiliary contactor relay
and reenable the direct current to direct
current (DC/DC) converter. If the auxiliary
contactor relay is already closed and the
DC/DC converter is already enabled, they will
remain so. As the auxiliary voltage continues
to decrease, the IAA module will continue to
try to run the DC/DC converter as long as
possible. The vacuum system will remain
active until the auxiliary battery voltage drops
below 9 volts. The IAA module will shut
down below 9 volts.
Symptom Chart
Symptom Chart
Condition
DTC B1317 Battery Voltage - •
•
High
DTC B1318 Battery Voltage - •
•
Low
Auxiliary Battery Charging
• DTC C1775 DC/DC Converter Failure
— The interface adapter assembly (IAA) module
Electrical Schematic
Refer to Electrical and Vacuum Troubleshooting
Manual, Cell 12, Auxiliary Battery Charging
System and Cell 13, Power Distribution (High
Voltage) for schematic and connector information.
Inspection and Verification
Refer to
Possible Sources
Circuit(s).
Auxiliary battery temperature
•
sensor.
Direct current to direct
•
current (DC/DC) converter.
Circuit(s).
Auxiliary battery temperature
•
sensor.
Direct current to direct
•
current (DC/DC) converter.
monitors the auxiliary battery voltage at pins
75, 76 (hot at all times). If the IAA module
senses the auxiliary battery voltage is too high
for more than 250 milliseconds, it will begin
to isolate the reason for the increase. This
strategy may include up to five attempts to
enable the direct current to direct current
(DC/DC) converter at 30-second intervals. The
IAA module may also open the auxiliary
contactor relay. If the IAA module suspects
the DC/DC converter is supporting the
auxiliary battery voltage too high (more than
16.5 volts) when commanded off, DTC C1775
is generated. The IAA module also generates
DTC C1775 when the auxiliary battery voltage
decreases below 11.5 volts and the DC/DC
converter is not indicating an overcurrent
(current limit) condition.
Section 100-07.
GO to Pinpoint Test A.
•
GO to Pinpoint Test B.
•
2001 Ranger EV, 01/2001
414-02-3
Action