Ford 2001 Ranger, Manual

Page: 314 / 1218

412-02-20 412-02-20 Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST J: DTC U2015 SIGNAL LINK FAULT (NON SCP)
TEST STEP ACTION TO TAKE
J8 CHECK PTC HEATER CORES
•
Disconnect the 12-volt auxiliary battery negative cable. Yes = GO to J9.
•
Remove the high-voltage power distribution box (HVPDB) cover and No = REPLACE the PTC heater
disconnect PTC switching module high-voltage C1912 . core.
•
If CORE A PID indicated FAULT, measure the resistance between the
DB wire and DG wire on PTC switching module C1912M.
•
If CORE B PID indicated FAULT, measure the resistance between the
R wire and W wire on PTC switching module C1912M.
•
Is the resistance between 65 and 140 ohms?
J9 INSPECT PTC HEATER CORES
•
Remove the PTC heater core and check for contaminants (excessive Yes = REPLACE the PTC
moisture and/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.
J10 CHECK STATUS OF PTC POWER ON SELF-TEST (POST) LINE
TO PTC SWITCHING MODULE
•
With key OFF, disconnect PTC switching module C1999. Yes = GO to J12.
•
With key ON, measure the voltage between pin 6 (LG wire) on PTC No = GO to J11.
switching module C1999 and ground.
•
Is the voltage greater than 9.5 volts?
J11 CHECK CIRCUIT 3834 (LG) FOR OPEN
•
Connect 104-Pin Breakout Box (BOB) to interface adapter assembly Yes = REPLACE the IAA module.
(IAA) module C1945; leave IAA module disconnected. REFER to Section 412-04 .
•
With key OFF, measure the resistance of the LG wire between pin 6 on No = REPAIR the LG wire.
PTC switching module C1999 and BOB pin 65.
•
Is the resistance less than 5 ohms?
J12 CHECK CIRCUIT 3834 (LG) FOR SHORT TO POWER
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = REPAIR the LG wire.
module disconnected.
•
With key ON, measure the voltage between BOB pin 65 and ground No = GO to J13.
(BOB pin 80).
•
Is the voltage greater than 0 volts?
J13 CHECK STATUS OF PTC POST LINE TO IAA MODULE
•
With key OFF, reconnect PTC switching module C1999. Yes = System OK. CHECK wiring
for intermittent connections.
•
With key ON, measure the voltage between BOB pin 65 and ground No = REPLACE the PTC
(BOB pin 80). switching module.
•
Is the voltage greater than 10 volts?
J14 CHECK PTC SWITCHING MODULE FOR SHORT
•
With key ON, monitor IAA module PID HTR SHT. Yes = GO to J15.
•
Disconnect PTC switching module C1999. No = REPLACE the PTC
•
Does the HTR SHT PID indicate YES?
switching module.
J15 CHECK CIRCUIT 3038 (O) FOR SHORT TO GROUND
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = REPLACE the IAA module.
module disconnected. REFER to Section 412-04 .
•
With key OFF, measure the resistance between BOB pin 53 and ground No = REPAIR the O wire.
(BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
2001 Ranger EV, 01/2001