Ford 2001 Ranger, Manual

Page: 339 / 1218

412-03-7 412-03-7 Air Conditioning
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST C: DTC B2119 COMPRESSOR FAILURE
TEST STEP ACTION TO TAKE
C3 CHECK CIRCUIT 3232 (P) FOR OPEN
•
Connect 104-Pin Breakout Box (BOB) to interface adapter assembly Yes = REPLACE IAA module.
(IAA) module C1945; leave IAA module disconnected. REFER to Section 412-04 .
•
With key OFF, measure the resistance of the P wire between pin 7 on No = REPAIR the P wire.
A/C IMC C1947 and BOB pin 36.
•
Is the resistance less than 5 ohms?
C4 CHECK A/C COMPRESSOR INTERLOCK CIRCUIT 3230 (Y)
FOR OPEN
•
With key OFF, measure the resistance of the Y wire between pin A and Yes = GO to C5.
pin F on A/C C1902.
•
Is the resistance less than 5 ohms?
No = REPLACE the A/C
compressor.
C5 CHECK A/C COMPRESSOR
•
With key OFF, measure the resistance between pin B (DG wire) and pin Yes = GO to C6.
C (BK wire) on A/C C1902.
•
With key OFF, measure the resistance between pin B (DG wire) and pin No = REPLACE the A/C
D (W wire) on A/C C1902. compressor.
•
With key OFF, measure the resistance between pin C (BK wire) and pin
D (W wire) on A/C C1902.
•
Are the resistances less than 5 ohms?
C6 CHECK CIRCUITS 3025 (Y/LG) AND 3027 (R/W) FOR OPEN(S)
•
Connect 104-Pin Breakout Box (BOB) to interface adapter assembly Yes = GO to C7.
(IAA) module C1945; leave IAA module disconnected.
•
With key OFF, disconnect A/C IMC C1947 and measure the resistance No = REPAIR the wire(s) in
of the Y/LG wire between pin 5 on A/C IMC C1947 and BOB pin 78. question.
•
With key OFF, measure the resistance of the R/W wire between pin 9 on
A/C IMC C1947 and BOB pin 40.
•
Are the resistances less than 5 ohms?
C7 CHECK CIRCUIT 3027 (R/W) FOR SHORT TO GROUND
•
With key OFF, measure the resistance between BOB pin 40 and ground Yes = GO to C8.
(BOB pin 80).
•
Is the resistance greater than 10,000 ohms?
No = REPAIR the R/W wire.
C8 CHECK A/C IMC GROUND REFERENCE
•
With key OFF, connect IAA module to BOB; leave BOB connected to Yes = GO to C9.
IAA module C1945.
•
With key OFF, measure the resistance between BOB pin 78 and ground No = REPLACE the IAA module.
(BOB pin 80). REFER to Section 412-04 .
•
Is the resistance less than 5 ohms?
C9 CHECK IAA MODULE
•
With key OFF, reconnect A/C C1902 and C1947. Yes = GO to C10.
•
With key ON, set the mode select knob to the A/C position, the No = REPLACE the IAA module.
temperature control knob to full cool position, and the blower control REFER to Section 412-04 .
knob to HIGH speed position, and monitor IAA module PID C/M SPD
while connecting a jumper wire between BOB pins 40 and 80.
•
Does the C/M SPD PID indicate 0 rpm?
C10 CHECK A/C COMPRESSOR OPERATION
•
Remove the jumper wire and check the A/C compressor. Yes = System OK. CHECK wiring
for intermittent connections.
•
Does the A/C compressor operate?
No = REPLACE the A/C IMC.
2001 Ranger EV, 01/2001