Ford 2001 Ranger, Manual

Page: 338 / 1218

412-03-6 412-03-6 Air Conditioning
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST B: DTC B1946 A/C POST EVAPORATOR SENSOR CIRCUIT FAILURE
TEST STEP ACTION TO TAKE
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = GO to B4.
module disconnected.
•
With key OFF, disconnect evaporator temperature sensor C1972 and No = REPAIR the wire(s) in
measure the resistance of the BK/W wire between evaporator temperature question.
sensor C1972 and BOB pin 102.
•
With key OFF, measure the resistance of the T/O wire between
evaporator temperature sensor C1972 and BOB pin 67.
•
Are the resistances less than 5 ohms?
B4 CHECK CIRCUIT 3063 (T/O) FOR SHORT TO POWER
•
With key OFF, measure the voltage between BOB pin 67 and ground Yes = REPAIR the T/O wire.
(BOB pin 80).
•
Is the voltage greater than 0 volt?
No = GO to B7.
B5 CHECK CIRCUIT 3063 (T/O) FOR SHORT TO GROUND
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = GO to B7.
module disconnected.
•
With key OFF, disconnect evaporator temperature sensor C1972 and No = REPAIR the T/O wire.
measure the resistance between BOB pin 67 and ground (BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
B6 CHECK EVAPORATOR TEMPERATURE READING FOR
NORMAL A/C OPERATION
•
Is the temperature reading in test step B1 between 0
°
C (32
°
F) and
Yes = System OK. CHECK wiring
10
°
C (50
°
F)?
for intermittent connections.
No = GO to B7.
B7 CHECK EVAPORATOR TEMPERATURE SENSOR
•
With key OFF, disconnect evaporator temperature sensor C1972 and Yes = REPLACE the IAA module.
measure the resistance between the terminals of the evaporator REFER to Section 412-04 .
temperature sensor and compare the reading to the values below:
Actual Temperature (Approximate)
No = REPLACE the evaporator
temperature sensor.
— 0
°
C (32
°
F) = 1350-1650 ohms
— 10
°
C (50
°
F) = 834-1020 ohms
— 15
°
C (59
°
F) = 646-790 ohms
— 20
°
C (68
°
F) = 531-649 ohms
— 25
°
C (77
°
F) = 419-512 ohms
— 30
°
C (86
°
F) = 348-425 ohms
— 35
°
C (95
°
F) = 278-340 ohms
•
Is the resistance OK?
PINPOINT TEST C: DTC B2119 COMPRESSOR FAILURE
TEST STEP ACTION TO TAKE
C1 CHECK A/C SWITCHED POWER OUTPUT FROM A/C
INVERTER MOTOR CONTROLLER (IMC) INTERLOCK
•
With key OFF, disconnect A/C C1902. Yes = GO to C4.
•
With key ON, set the mode select knob to the A/C position and measure No = GO to C2.
the voltage between terminal A on the A/C IMC and ground.
•
Is the voltage greater than 10 volts?
C2 CHECK A/C SWITCHED POWER TO A/C IMC INTERLOCK
•
With key OFF, disconnect A/C IMC C1947. Yes = REPLACE A/C IMC.
•
With key ON, set the mode select knob to the A/C position and measure No = GO to C3.
the voltage between pin 7 (P wire) on A/C IMC C1947 and ground.
•
Is the voltage greater than 10 volts?
(Continued)
2001 Ranger EV, 01/2001