Ford Electric Ranger 2001 Manual page 318

412-02-24
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST N: DTC B2516 BLOWER CONTROL CIRCUIT FAILURE
• Do DTC B2514 Blower (Fan) Circuit Short to Vbat and/or DTC
B2515 Heater Blower Relay Circuit Failure also occur?
N2 CHECK GROUND TO VARIABLE BLOWER CONTROLLER
(VBC)
• With key OFF, disconnect VBC C1971 and measure the resistance
between pin 5 (BK wire) on VBC C1971 and ground.
• Is the resistance less than 5 ohms?
N3 CHECK VARIABLE BLOWER CONTROLLER (VBC) FEEDBACK
CIRCUIT FOR SHORT TO POWER
• With key OFF, disconnect VBC C1971.
• With key ON, measure the voltage between pin 1 (Y/R wire) on VBC
C1971 and ground.
• Is the voltage greater than 0 volts?
N4 CHECK CIRCUIT 148 (Y/R) FOR SHORT TO POWER
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key ON, measure the voltage between BOB pin 64 and ground
(BOB pin 80).
• Is the voltage greater than 0 volts?
N5 CHECK BLOWER/FAN STATUS
• With key ON, set the mode select knob to the PANEL/FLOOR position
and monitor the IAA module PIDs BLOWER and BFSV while rotating
the blower control knob through all the blower speed positions and verify
the voltages below:
— LOW = 9.8-10.4 volts
— MED 1 = 6.8-7.4 volts
— MED 2 = 3.9-4.5 volts
— HIGH = 1.4-2.1 volts
• Are the voltages correct?
N6 CHECK CIRCUIT 515 (O/R) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to interface adapter assembly
(IAA) module C1945; leave IAA module disconnected.
• With key OFF, disconnect variable blower controller (VBC) C1971 and
measure the resistance of the O/R wire between pin 2 on VBC C1971
and BOB pin 5.
• Is the resistance less than 5 ohms?
N7 CHECK CIRCUIT 515 (O/R) FOR SHORT TO GROUND
• With key OFF, measure the resistance between BOB pin 5 and ground
(BOB pin 80).
• Is the resistance greater than 10,000 ohms?
N8 CHECK CIRCUIT 515 (O/R) FOR SHORT TO POWER
• With key ON, measure the voltage between BOB pin 5 and ground
(BOB pin 80).
• Is the voltage greater than 0 volts?
Heating and Ventilation
TEST STEP ACTION TO TAKE
If both DTC B2514 and
DTC B2515, GO to N3.
No = GO to N5.
Yes = REPLACE the VBC.
REFER to Section
No = REPAIR the BK wire.
Yes = GO to N4.
No = System OK. CHECK wiring
for intermittent connections.
REPAIR the Y/R wire.
No = REPLACE the IAA module.
REFER to Section
Yes = System OK. CHECK wiring
for intermittent connections.
GO to N6.
No =
GO to N7.
Yes =
No = REPAIR the O/R wire.
GO to N8.
Yes =
No = REPAIR the O/R wire.
Yes = REPAIR the O/R wire.
No = REPLACE the VBC.
REFER to Section
2001 Ranger EV, 01/2001
412-02-24
412-04.
412-04.
412-04.