Ford 2001 Ranger, Manual

Page: 299 / 1218

412-02-5 412-02-5 Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
Electrical Schematic
•
DTC B2516 Blower Control Circuit Failure
Refer to Electrical and Vacuum Troubleshooting
— The interface adapter assembly (IAA) module
Manual, Cell 53, Heater or Cell 54, Air
provides the pulse width modulation (PWM)
Conditioner/Heater for schematic and connector
control signal to the variable blower controller
information.
(VBC) and monitors the VBC feedback. The
IAA module sets DTC B2516 if the blower
Inspection and Verification
motor relay is closed, the VBC control PWM
Refer to Section 100-07 .
is greater than 80% duty cycle for more than
30 seconds, and the VBC feedback is greater
than the auxiliary battery voltage minus 2
volts.
Symptom Chart
Symptom Chart
Condition Possible Sources Action
•
DTC B1238 Over
•
Positive temperature
•
GO to Pinpoint Test A.
Temperature Fault coefficient (PTC) heater
overtemperature switch
harness assembly.
•
Circuit(s).
•
Interface adapter assembly
(IAA) module.
•
PTC switching module.
•
DTC B1249 Blend Door
•
Blend door actuator.
•
GO to Pinpoint Test B.
Failure
•
Circuit(s).
•
Interface adapter assembly
(IAA) module.
•
DTC B1250 Air Temperature
•
Interface adapter assembly
•
GO to Pinpoint Test C.
Internal Sensor Circuit Failure (IAA) module.
•
Circuit(s).
•
In-car temperature sensor.
•
In-car temperature sensor
hose and elbow.
•
DTC B1254 Air Temperature
•
Ambient temperature sensor.
•
GO to Pinpoint Test D.
External Sensor Circuit
•
Circuit(s).
Failure
•
Interface adapter assembly
(IAA) module.
•
DTC C1776 Heater System
•
Positive temperature
•
GO to Pinpoint Test E.
Failure coefficient (PTC) heater core.
•
Circuit(s).
•
PTC switching module.
•
Interface adapter assembly
(IAA) module.
•
High-voltage power
distribution box (HVPDB).
•
High-voltage PTC HTR fuse.
•
DTC C1779 Blower Switch
•
Circuit(s).
•
GO to Pinpoint Test F.
Failure
•
Interface adapter assembly
(IAA) module.
•
Blower switch.
2001 Ranger EV, 01/2001