Ford Ranger EV (2001 year). Manual — part 77
412-02-13
412-02-13
Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST E: DTC C1776 HEATER SYSTEM FAILURE
TEST STEP
ACTION TO TAKE
E9 CHECK PTC HEATER CORE B CONTROL CIRCUIT FOR
SHORT TO GROUND
•
With key OFF, disconnect BOB from IAA module; leave BOB
Yes =
GO to E10.
connected to IAA module C1945.
•
With key OFF, measure the resistance between BOB pin 34 and ground
No =
REPLACE the IAA module.
(BOB pin 80).
REFER to
•
Is the resistance less than 7,000 ohms?
E10 CHECK CIRCUIT 3261 (PK/Y) FOR SHORT TO GROUND
•
Reconnect the 12-volt auxiliary battery negative cable.
Yes =
REPLACE the PTC
switching module. REFER
to
•
With key OFF, disconnect PTC switching module C1999 and measure
No =
REPAIR the PK/Y wire.
the resistance between BOB pin 34 and ground (BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
E11 CHECK PTC HEATER CORES
•
Disconnect the 12-volt auxiliary battery negative cable.
Yes =
GO to E12.
•
Remove the high-voltage power distribution box (HVPDB) cover.
No =
REPLACE the PTC heater
•
Disconnect PTC switching module high-voltage C1912 and measure the
core.
resistance between the DB wire and DG wire on PTC switching module
C1912M.
•
Measure the resistance between the R wire and W wire on PTC
switching module C1912M.
•
Are the resistances between 65 and 140 ohms?
E12 CHECK HIGH-VOLTAGE POWER TO PTC SWITCHING
MODULE
Yes =
WARNING: The following test steps contain high-voltage
procedures. High-voltage insulated safety gloves and face shield must
be worn when carrying out the following steps. Failure to follow this
warning may result in severe personal injury or death.
•
Disconnect HVPDB PTC switching module high-voltage C1920.
•
Reinstall the HVPDB cover.
No =
GO to E13.
•
Reconnect the 12-volt auxiliary battery negative cable.
•
With key ON, measure the voltage between circuit 3104 (DB wire) and
circuit 3105 (W wire) on HVPDB PTC switching module C1920F.
•
Is the voltage greater than 300 volts?
E13 CHECK HIGH-VOLTAGE FUSE
•
With key OFF, disconnect the 12-volt auxiliary battery negative cable.
Yes =
REPLACE the 25A PTC
HTR fuse. GO to E14.
•
Disconnect high-voltage auxiliary load in-line C1935 on the traction
No =
REPLACE the HVPDB.
battery support tray.
REFER to
•
Disconnect all HVPDB high-voltage connectors.
or
•
Disconnect power steering assembly high-voltage C1895.
•
Measure the resistance of the 25A PTC HTR fuse.
•
Is the resistance greater than 1,000 ohms?
E14 CHECK PTC SWITCHING MODULE FOR SHORT
•
Measure the resistance between circuit 3104 (DB wire) and circuit 3105
Yes =
REPLACE the PTC
(W wire) on HVPDB PTC switching module C1920M.
switching module.
•
Is the resistance less than 30 ohms?
No =
GO to E15.
E15 CHECK HVPDB FOR SHORT
•
Measure the resistance between circuit 3104 (DB wire) and circuit 3105
Yes =
(W wire) on HVPDB PTC switching module C1920F.
(Continued)
412-02-14
412-02-14
Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST E: DTC C1776 HEATER SYSTEM FAILURE
TEST STEP
ACTION TO TAKE
•
Is the resistance greater than 10,000 ohms?
No =
REPLACE the HVPDB.
REFER to
or
E16 CHECK SYSTEM
•
With key OFF, reconnect all component connectors that were
Yes =
REPLACE the PTC
disconnected.
switching module.
REPLACE the 25A PTC
HTR fuse. REFER to
•
With key ON, set the mode select knob to the PANEL/FLOOR position,
No =
System OK.
the temperature control knob to the full warm position, and the blower
control knob to the HIGH speed position.
•
Does the 25A PTC HTR high-voltage fuse fail again?
E17 INSPECT PTC HEATER CORES
•
Remove the PTC heater core and check for contaminants (excessive
Yes =
REPLACE the PTC
moisture or debris) on the heater core.
switching module.
•
Is the heater core clear of contaminants?
No =
REMOVE the contaminants.
If necessary, REPLACE the
PTC heater core.
PINPOINT TEST F: DTC C1779 BLOWER SWITCH FAILURE
TEST STEP
ACTION TO TAKE
F1 CHECK BLOWER SWITCH STATUS
•
With key ON, monitor the interface adapter assembly (IAA) module PID
Yes =
System OK. CHECK wiring
BLOWER while rotating the blower control knob through all the blower
for intermittent connections.
speed positions.
•
Does the BLOWER PID agree with all the blower speed positions?
No =
GO to F2.
F2 CHECK BLOWER SWITCH INPUT VOLTAGE REFERENCES
•
Connect 104-Pin Breakout Box (BOB) to IAA module and IAA module
Yes =
C1945.
•
With key ON, measure the voltage between BOB pins 60, 61, 62 and
No =
GO to F3.
ground (BOB pin 80).
•
Do the voltages fluctuate between 0 and 2.8 volts?
F3 CHECK GROUND TO BLOWER SWITCH
•
With key OFF, disconnect blower switch C232 and measure the
Yes =
GO to F4.
resistance between the BK wire on blower switch C232 and ground.
•
Is the resistance less than 5 ohms?
No =
REPAIR the BK wire.
F4 CHECK CIRCUITS 751 (DB/W), 752 (Y/R), AND 754 (LG/W) FOR
OPEN(S)
•
With key OFF, disconnect IAA module from BOB; leave BOB
Yes =
GO to F5.
connected to IAA module C1945.
•
With key OFF, measure the resistance of the DB/W wire between blower No =
REPAIR the wire(s) in
switch C232 and BOB pin 62.
question.
•
With key OFF, measure the resistance of the Y/R wire between blower
switch C232 and BOB pin 61.
•
With key OFF, measure the resistance of the LG/W wire between blower
switch C232 and BOB pin 60.
•
Are the resistances less than 5 ohms?
F5 CHECK CIRCUITS 751 (DB/W), 752 (Y/R), AND 754 (LG/W) FOR
SHORT(S) TO GROUND
(Continued)
412-02-15
412-02-15
Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST F: DTC C1779 BLOWER SWITCH FAILURE
TEST STEP
ACTION TO TAKE
•
With key OFF, measure the resistance between BOB pins 60, 61, 62 and
Yes =
GO to F6.
ground (BOB pin 80).
•
Are the resistances greater than 10,000 ohms?
No =
REPAIR the wire(s) in
question.
F6 CHECK CIRCUITS 751 (DB/W), 752 (Y/R), AND 754 (LG/W) FOR
SHORT(S) TO POWER
•
With key ON, measure the voltage between BOB pins 60, 61, 62 and
Yes =
REPAIR the wire(s) in
ground (BOB pin 80).
question.
•
Are any of the voltages greater than 0 volts?
No =
REPLACE the IAA module.
REFER to
F7 CHECK BLOWER SWITCH
•
With key OFF, disconnect blower switch C232 and check the continuity
Yes =
REPLACE the IAA module.
of the blower switch by measuring the resistance between the circuit 57
REFER to
(BK wire) terminal and the indicated terminals on the blower switch.
Compare the readings to the values below:
Low Blower Position
No =
REPLACE the blower
switch.
— Circuit 751 (DB/W wire) terminal = Open
— Circuit 752 (Y/R wire) terminal = Open
— Circuit 754 (LG/W wire) terminal = Open
Medium Blower Position
— Circuit 751 (DB/W wire) terminal = Closed
— Circuit 752 (Y/R wire) terminal = Open
— Circuit 754 (LG/W wire) terminal = Open
Medium-High Blower Position
— Circuit 751 (DB/W wire) terminal = Closed
— Circuit 752 (Y/R wire) terminal = Closed
— Circuit 754 (LG/W wire) terminal = Open
High Blower Position
— Circuit 751 (DB/W wire) terminal = Open
— Circuit 752 (Y/R wire) terminal = Closed
— Circuit 754 (LG/W wire) terminal = Closed
•
Is the blower switch OK?
PINPOINT TEST G: DTC C1780 TEMPERATURE SELECT FAILURE
TEST STEP
ACTION TO TAKE
G1 CHECK TEMPERATURE CONTROL OPERATION
•
With key ON, monitor the interface adapter assembly (IAA) module PID
Yes =
System OK. CHECK wiring
SET TMP while rotating the temperature control knob from the full
for intermittent connections.
cool position to the full warm position.
•
Does the SET TMP PID indicate approximately 98% at the full
No =
GO to G2.
cool position and approximately 1% at the full warm position?
G2 CHECK TEMPERATURE CONTROL VOLTAGE REFERENCE
•
With key OFF, disconnect temperature control C231.
Yes =
•
With key ON, measure the voltage between the LG/O wire and Y/LG
No =
GO to G3.
wire on temperature control C231.
•
Is the voltage between 4.8 and 5.2 volts?
G3 CHECK CIRCUITS 3057 (LG/O) AND 3059 (Y/LG) FOR OPEN(S)
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
(Continued)
412-02-16
412-02-16
Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST G: DTC C1780 TEMPERATURE SELECT FAILURE
TEST STEP
ACTION TO TAKE
•
With key OFF, measure the resistance of the LG/O wire between
No =
REPAIR the wire(s) in
temperature control C231 and BOB pin 84.
question.
•
With key OFF, measure the resistance of the Y/LG wire between
temperature control C231 and BOB pin 71.
•
Are the resistances less than 5 ohms?
G4 CHECK CIRCUIT 3057 (LG/O) FOR SHORT TO GROUND
•
With key OFF, measure the resistance between BOB pin 84 and ground
Yes =
REPLACE the IAA module.
(BOB pin 80).
REFER to
•
Is the resistance greater than 10,000 ohms?
No =
REPAIR the LG/O wire.
G5 CHECK CIRCUIT 3058 (LG/R) FOR OPEN
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
GO to G6.
module disconnected.
•
With key OFF, measure the resistance of the LG/R wire between pin 2
No =
REPAIR the LG/R wire.
on temperature control C231 and BOB pin 50.
•
Is the resistance less than 5 ohms?
G6 CHECK CIRCUIT 3058 (LG/R) FOR SHORT TO GROUND
•
With key OFF, measure the resistance between BOB pin 50 and ground
Yes =
GO to G7.
(BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
No =
REPAIR the LG/R wire.
G7 CHECK CIRCUIT 3058 (LG/R) FOR SHORT TO POWER
•
With key ON, measure the voltage between BOB pin 50 and ground
Yes =
REPAIR the LG/R wire.
(BOB pin 80).
•
Is the voltage greater than 0 volts?
No =
GO to G8.
G8 CHECK RESISTANCE OF TEMPERATURE CONTROL
POTENTIOMETER
•
With key OFF, reconnect temperature control C231.
Yes =
REPLACE the IAA module.
REFER to
•
With key OFF, measure the resistance between the BOB pins 50 and 84
No =
REPLACE the temperature
with the temperature control knob in the indicated positions and verify
control potentiometer.
the resistances below:
— Full cool = 90-300 ohms
— Midscale = 2,000-3,000 ohms
— Full warm = 4,000-5,000 ohms
•
Are the resistances OK?
PINPOINT TEST H: DTC B1857 CLIMATE CONTROL ON/OFF SWITCH FAILURE
TEST STEP
ACTION TO TAKE
H1 IDENTIFY VACUUM PUMP SYMPTOM
•
With key ON, set the mode select knob to the OFF and PANEL/FLOOR Yes = GO to
positions and listen for the vacuum pump cycling on and off
continuously.
•
Does the vacuum pump cycle on and off continuously?
No =
GO to H2.
H2 IDENTIFY VEHICLE OPTION
•
Identify the vehicle option (A/C or non-A/C).
Yes =
GO to H3.
•
Is the vehicle equipped with A/C?
No =
H3 CARRY OUT ON-DEMAND SELF-TEST IN A/C MODE
•
With key ON, set the mode select knob to the A/C position and carry out Yes =
the on-demand self-test for the interface adapter assembly (IAA) module.
•
Does DTC B1857 Climate Control On/Off Switch Failure occur?
No =
(Continued)
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