Ford 2001 Ranger, Manual

Page: 317 / 1218

412-02-23 412-02-23 Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST L: DTC B2514 BLOWER (FAN) CIRCUIT SHORT TO VBAT
TEST STEP ACTION TO TAKE
•
With key ON, measure the voltage between pin 30 on the blower motor No = GO to L5.
relay connector and ground.
•
Is the voltage greater than 0 volts?
L5 CHECK BLOWER MOTOR RELAY CONTROL CIRCUIT
•
Enter the IAA module active command mode CLIMATE SYSTEM Yes = GO to L6.
CONTROL, set the active command PUMP/VBC to OFF, and measure
the resistance between pin 86 on the blower motor relay connector and
ground.
•
Is the resistance less than 5 ohms?
No = System OK. CHECK wiring
for intermittent connections.
L6 CHECK CIRCUIT 3020 (LB) 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 19 and ground No = REPAIR the LB wire.
(BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
PINPOINT TEST M: DTC B2515 HEATER BLOWER RELAY CIRCUIT FAILURE
TEST STEP ACTION TO TAKE
M1 CHECK FOR BLOWER/FAN SYSTEM DIAGNOSTIC TROUBLE
CODES (DTCs)
•
Carry out the on-demand self-test for the interface adapter assembly Yes = GO to Pinpoint Test N.
(IAA) module and check for blower/fan system DTCs.
•
Do DTC B2514 Blower (Fan) Circuit Short to Vbat and/or DTC
No = GO to M2.
B2516 Blower Control Circuit Failure also occur?
M2 CHECK POWER TO VARIABLE BLOWER CONTROLLER
(VBC)
•
With key OFF, disconnect VBC C1971. Yes = REPLACE the VBC.
REFER to Section 412-04 .
•
With key ON, measure the voltage between pin 3 (R wire) on VBC No = GO to M3.
C1971 and ground.
•
Is the voltage greater than 10 volts?
M3 CHECK CIRCUIT 361 (R) FOR OPEN
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = GO to M4.
module disconnected.
•
With key OFF, measure the resistance of the R wire between pin 3 on No = REPAIR the R wire.
VBC C1971 and BOB pin 38.
•
Is the resistance less than 5 ohms?
M4 CHECK CIRCUIT 361 (R) FOR SHORT TO POWER
•
With key ON, measure the voltage between BOB pin 38 and ground Yes = REPAIR the R wire.
(BOB pin 80).
•
Is the voltage greater than 0 volts?
No = REPLACE the IAA module.
REFER to Section 412-04 .
PINPOINT TEST N: DTC B2516 BLOWER CONTROL CIRCUIT FAILURE
TEST STEP ACTION TO TAKE
N1 CHECK FOR BLOWER/FAN SYSTEM DIAGNOSTIC TROUBLE
CODES (DTCs)
•
Carry out the on-demand self-test for the interface adapter assembly Yes = If only DTC B2515, GO to
(IAA) module and check for blower/fan system DTCs.
N2.
(Continued)
2001 Ranger EV, 01/2001