Ford 2001 Ranger, Manual

Page: 628 / 1218

414-03B-25 414-03B-25 High Voltage/Traction Battery — Nickel Metal Hydride
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC C1835 CURRENT SENSE CIRCUIT FAILURE
TEST STEP ACTION TO TAKE
A14 CHECK CIRCUIT 3138 (LB/BK) FOR SHORT TO POWER
•
With key OFF, disconnect the BOB from the BCM; leave BOB Yes = REPAIR the LB/BK wire.
connected to BCM C1986 and C1987.
•
With key OFF, disconnect contactor box C1982. No = REPLACE the BCM.
•
With key ON, measure the voltage between BOB pin B22 and ground
(BOB pin A33).
•
Is the voltage greater than 0 volts?
A15 CHECK CONTACTOR BOX SIGNAL TO BCM
•
With key OFF, disconnect the BOB from the BCM; leave BOB Yes = REPLACE the BCM.
connected to BCM C1986 and C1987.
•
With key ON, measure the voltage between BOB pin B22 and ground No = GO to A16.
(BOB pin A33).
•
Is the voltage between 7.5 and 9 volts?
A16 CHECK CIRCUIT 3138 (LB/BK) FOR OPEN
•
With key OFF, disconnect contactor box C1982 and measure the Yes = GO to A17.
resistance of the LB/BK wire between pin 12 on contactor box C1982
and BOB pin B22.
•
Is the resistance less than 5 ohms?
No = REPAIR the LB/BK wire.
A17 CHECK CIRCUIT 3138 (LB/BK) FOR SHORT TO GROUND
•
With key OFF, measure the resistance between BOB pin B22 and ground Yes = REPLACE the contactor
(BOB pin A33). box.
•
Is the resistance greater than 10,000 ohms?
No = REPAIR the LB/BK wire.
Electrical Schematic
Current Leakage Detection
Refer to Electrical and Vacuum Troubleshooting
Diagnostic Trouble Code (DTC) Definition
Manual, Cell 16, Traction Battery System for
The following DTC relates to current leakage
schematic and connector information.
detection:
Inspection and Verification
•
DTC C1839 Leakage Fault
Refer to Section 100-07 .
— Current leakage is a low level of impedance
between vehicle chassis and either traction
battery positive (TB+) or traction battery
negative (TB-). The battery control module
(BCM) checks for a parallel combination of
bus leakage impedance (between vehicle
chassis and TB+, and between vehicle chassis
and TB-) during the charge and drive cycles.
The BCM sets DTC C1839 when it detects a
low level of leakage (between 10,000 and
50,000 ohms) during charging, high level
leakage (less than 10,000 ohms) during
charging, leakage (less than 50,000 ohms)
during driving, or if the leakage circuit fails.
The BCM uses PIDs to indicate when the
leakage occurred, the severity of the leakage
when it occurred, and the status of the leakage
circuits.
2001 Ranger EV, 01/2001