Ford Electric Ranger 2001 Manual page 337

412-03-5
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: DTC P1461 A/C PRESSURE SENSOR CIRCUIT HIGH INPUT
• Is the pressure above 345 kPa (50 psi)?
A3 CHECK A/C PRESSURE SENSOR VOLTAGE REFERENCE
• With key OFF, disconnect A/C pressure sensor C1994.
• With key ON, measure the voltage between pin 1 (BK/PK wire) and pin
2 (DG/O wire) on A/C pressure sensor C1994.
• Is the voltage between 4.8 and 5.2 volts?
A4 CHECK CIRCUITS 3030 (DG/O) AND 3031 (BK/PK) FOR OPEN(S)
• Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =
module disconnected.
• With key OFF, measure the resistance of the DG/O wire between pin 2
on A/C pressure sensor C1994 and BOB pin 86.
• With key OFF, measure the resistance of the BK/PK wire between pin 1
on A/C pressure sensor C1994 and BOB pin 82.
• Are the resistances less than 5 ohms?
A5 CHECK CIRCUIT 3030 (DG/O) FOR SHORT TO GROUND
• With key OFF, measure the resistance between BOB pin 86 and ground
(BOB pin 80).
• Is the resistance greater than 10,000 ohms?
A6 CHECK CIRCUIT 3029 (DG/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 DG/O wire between A/C
pressure sensor C1994 and BOB pin 3.
• Is the resistance less than 5 ohms?
A7 CHECK CIRCUIT 3029 (DG/O) FOR SHORT TO GROUND
• With key OFF, measure the resistance between BOB pin 3 and ground
(BOB pin 80).
• Is the resistance greater than 10,000 ohms?
A8 CHECK CIRCUIT 3029 (DG/O) FOR SHORT TO POWER
• With key ON, measure the voltage between BOB pin 3 and ground
(BOB pin 80).
• Is the voltage greater than 0 volt?
PINPOINT TEST B: DTC B1946 A/C POST EVAPORATOR SENSOR CIRCUIT FAILURE
B1 CHECK EVAPORATOR TEMPERATURE
• With key ON, set the mode select knob to the A/C position, the
temperature control knob to full cool position, and the blower control
knob to HIGH speed position, and monitor the interface adapter assembly
(IAA) module PID ACPEVAP.
• Is the temperature between -40°C (-40°F) and 215°C (419°F)?
B2 IDENTIFY EVAPORATOR TEMPERATURE READING
• Is the temperature reading in test step B1 equal to 215°C (419°F)?
B3 CHECK CIRCUITS 3051 (BK/W) AND 3063 (T/O) FOR OPEN(S)
(Continued)
Air Conditioning
TEST STEP
TEST STEP
ACTION TO TAKE
No = CHECK the refrigerant
system for leaks. REPAIR
as necessary. RECHARGE
the A/C system.
GO to A6.
Yes =
GO to A4.
No =
GO to A5.
No = REPAIR the wire(s) in
question.
Yes = REPLACE the IAA module.
REFER to Section
No = REPAIR the DG/O wire.
GO to A7.
No = REPAIR the DG/O wire.
Yes = GO to A8.
No = REPAIR the DG/O wire.
Yes = REPAIR the DG/O wire.
No = REPLACE the A/C pressure
sensor.
ACTION TO TAKE
GO to B6.
Yes =
No = GO to B2.
GO to B3.
Yes =
No = GO to B5.
2001 Ranger EV, 01/2001
412-03-5
412-04.