Ford 2001 Ranger, Manual

Page: 337 / 1218

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