Ford Electric Ranger 2001 Manual page 313

412-02-19
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST J: DTC U2015 SIGNAL LINK FAULT (NON SCP)
J1 CHECK HEATER CORE OVERTEMPERATURE STATUS
NOTE: Diagnostic trouble code (DTC) U2015 Signal Link Fault (Non
SCP) occurs with other vehicle faults. Do NOT proceed with the following
test steps unless the heating system is inoperative (no heat condition).
• With key ON, monitor interface adapter assembly (IAA) module PID
HTR OT.
• Does the HTR OT PID indicate YES?
J2 CHECK SWITCHED POWER STATUS TO POSITIVE
TEMPERATURE COEFFICIENT (PTC) SWITCHING MODULE
NOTE: The HTR PWR PID may fluctuate between ENABLE and
DISABLE when the key is turned to the ON position. If this occurs, you
must wait 30 seconds for the final result.
• With key ON, monitor IAA module PID HTR PWR for 30 seconds.
• Does the HTR PWR PID indicate ENABLE?
J3 CHECK SWITCHED POWER TO PTC SWITCHING MODULE
• With key OFF, disconnect PTC switching module C1999.
• With key ON, measure the voltage between pin 1 (LG/O wire) and pin 2
(Y/W wire) on PTC switching module C1999.
• Is the voltage greater than 10 volts?
J4 CHECK GROUND REFERENCE TO PTC SWITCHING MODULE
• With key OFF, measure the resistance between pin 2 (Y/W wire) on
PTC switching module C1999 and ground.
• Is the resistance less than 5 ohms?
J5 CHECK CIRCUIT 3036 (Y/W) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, measure the resistance of the Y/W wire between pin 2 on No =
PTC switching module C1999 and BOB pin 74.
• Is the resistance less than 5 ohms?
J6 CHECK CIRCUIT 3035 (LG/O) FOR OPEN
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, measure the resistance of the LG/O wire between pin 1
on PTC switching module C1999 and BOB pin 37.
• Is the resistance less than 5 ohms?
J7 CHECK STATUS OF PTC HEATER CORES
NOTE: Turn the key to the OFF position and clear continuous IAA
module diagnostic trouble codes (DTCs) before proceeding. If PIDs
CORE A and CORE B indicate RETRY and PIDs HTR CAR and
HTR CBR indicate YES after 45 seconds, wait approximately 4 minutes
for the results. If CORE A or CORE B does not indicate FAULT, cycle
the ignition key OFF/ON and repeat.
• With key ON, set the mode select knob to the PANEL/FLOOR position
and the temperature control knob to the full warm position, and monitor
IAA module PIDs CORE A, CORE B, HTR CAR, HTR CBR, and
HTR SHT for 45 seconds.
NOTE: If CORE A and CORE B PIDs both indicate OFF and the
HTR SHT PID indicates YES, GO to J14.
• Does the CORE A or the CORE B PID indicate FAULT?
(Continued)
Heating and Ventilation
TEST STEP ACTION TO TAKE
Yes = GO to Pinpoint Test A.
GO to J2.
No =
Yes = GO to J7.
No = GO to J3.
Yes = REPLACE the PTC
switching module.
GO to J4.
No =
GO to J6.
Yes =
GO to J5.
No =
REPLACE the IAA module.
REFER to Section
REPAIR the Y/W wire.
REPLACE the IAA module.
REFER to Section
No = REPAIR the LG/O wire.
Yes = GO to J8.
GO to J10.
No =
2001 Ranger EV, 01/2001
412-02-19
412-04.
412-04.