Fuse - Ford Electric Ranger 2001 Manual

414-03A-50
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST B: DTC C1837 BATTERY HEATER CIRCUIT FAILURE
B4 CHECK CONTACTOR BOX HIGH-VOLTAGE FUSE
• Remove the 10A HTR fuse from the contactor box. Refer to the
Contactor Box Fuses Removal and Installation procedure in this section.
• Measure the resistance of the 10A HTR fuse.
• Is the resistance greater than 1,000 ohms?
B5 CHECK UPPER BATTERY HEATERS FOR OPEN
• Remove the traction battery and connect Traction Battery High-Voltage
Lockout and Diagnostic Tool to the traction battery high-voltage two-pin
C3994M.
WARNING: The traction battery contains high-voltage
components and wiring. High-voltage insulated safety gloves and face
shield must be worn when performing the following steps. Failure to
follow this warning may result in severe personal injury or death.
• Disconnect contactor box C1864 and measure the resistance between pin
B (BK wire) and pin C (R wire) on contactor box C1864. Record
resistance value on the Repair Order.
• Is the resistance between 330 and 390 ohms?
B6 CHECK CIRCUITS 3709 (R) AND 57 (BK) FOR OPEN(S)
• With key OFF, disconnect upper battery heater C1859 and measure the
resistance of the R wire between pin C on contactor box C1864 and
upper battery heater C1859.
• With key OFF, disconnect upper battery heater C1861 and measure the
resistance of the BK wire between pin B on contactor box C1864 and
upper battery heater C1861.
• Are the resistances less than 5 ohms?
B7 CHECK BATTERY HEATER #1 CONTROL (CLOSE SIGNAL)
• Connect Traction Battery High-Voltage Service Cord to traction battery
support tray in-line C1935F and in-line C1935M.
• Connect Traction Battery Low-Voltage Service Cord to traction battery
support tray in-line C1939F and in-line C1939M.
• Connect 104-Pin Breakout Box (BOB) to BCM and BCM C1986, C1987
using the BCM/TIM BOB Adapter Cable and Overlay.
• Enter BCM active command mode BCM PACKETED COMMANDS, set
the active command BAT HTR 1 to ENABLE, and measure the voltage
between BOB pin A2 and ground (BOB pin A33).
• Is the voltage greater than 10 volts?
B8 CHECK CIRCUIT 3001 (P/O) FOR SHORT TO GROUND
• With key OFF, disconnect BOB from BCM; leave BOB connected to
BCM C1986 and C1987.
• With key OFF, disconnect contactor box C1982 and measure the
resistance between BOB pin A2 and ground (BOB pin A33).
• Is the resistance greater than 10,000 ohms?
B9 CHECK CIRCUIT 3001 (P/O) FOR OPEN
• With key OFF, disconnect contactor box C1982 and measure the
resistance of the P/O wire between pin 2 on contactor box C1982 and
BOB pin A2.
• Is the resistance less than 5 ohms?
(Continued)
High Voltage/Traction Battery
TEST STEP
414-03A-50
ACTION TO TAKE
Yes = REPLACE the 10A HTR

fuse.

No = REPLACE the contactor
box.
GO to B7.
Yes =
No = GO to B6.
Yes = DISCONNECT and
MEASURE the resistance of
each upper battery module
heater (the resistance should
be between 28 and 32
ohms). REPLACE the
battery module heater(s) in
question.
No = REPLACE high-voltage
harness 10B700.
GO to B9.
Yes =
GO to B8.
No =
Yes = REPLACE the BCM.
No = REPAIR the P/O wire.
Yes = REPLACE the contactor
box.
No = REPAIR the P/O wire.
2001 Ranger EV, 01/2001