Ford Electric Ranger 2001 Manual page 338

412-03-6
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST B: DTC B1946 A/C POST EVAPORATOR SENSOR CIRCUIT FAILURE
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, disconnect evaporator temperature sensor C1972 and
measure the resistance of the BK/W wire between evaporator temperature
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
(BOB pin 80).
• Is the voltage greater than 0 volt?
B5 CHECK CIRCUIT 3063 (T/O) FOR SHORT TO GROUND
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, disconnect evaporator temperature sensor C1972 and
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
10°C (50°F)?
B7 CHECK EVAPORATOR TEMPERATURE SENSOR
• With key OFF, disconnect evaporator temperature sensor C1972 and
measure the resistance between the terminals of the evaporator
temperature sensor and compare the reading to the values below:
Actual Temperature (Approximate)
— 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
C1 CHECK A/C SWITCHED POWER OUTPUT FROM A/C
INVERTER MOTOR CONTROLLER (IMC) INTERLOCK
• With key OFF, disconnect A/C C1902.
• With key ON, set the mode select knob to the A/C position and measure
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.
• With key ON, set the mode select knob to the A/C position and measure
the voltage between pin 7 (P wire) on A/C IMC C1947 and ground.
• Is the voltage greater than 10 volts?
(Continued)
Air Conditioning
TEST STEP
TEST STEP
ACTION TO TAKE
GO to B4.
No = REPAIR the wire(s) in
question.
Yes = REPAIR the T/O wire.
GO to B7.
No =
GO to B7.
No = REPAIR the T/O wire.
Yes = System OK. CHECK wiring
for intermittent connections.
GO to B7.
No =
Yes = REPLACE the IAA module.
REFER to Section
No = REPLACE the evaporator
temperature sensor.
ACTION TO TAKE
GO to C4.
Yes =
No = GO to C2.
Yes = REPLACE A/C IMC.
GO to C3.
No =
2001 Ranger EV, 01/2001
412-03-6
412-04.