Ford Ranger EV (2001 year). Manual — part 85

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.

412-03-8

412-03-8

Air Conditioning

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST D: DTC B2518 COMPRESSOR OVERTEMPERATURE FAULT

TEST STEP

ACTION TO TAKE

D1 CHECK FOR A/C TEMPERATURE SENSOR OUT OF RANGE

FAULT

•

Check the interface adapter assembly (IAA) module for continuous Yes = GO to

Pinpoint Test E.

diagnostic trouble codes (DTCs).

•

Does DTC B2606 A/C Temperature Sensor Out of Range occur

No =

GO to D2.

along with DTC B2518 Compressor Overtemperature Fault?

D2 CHECK COMPRESSOR TEMPERATURE

•

With key ON, monitor IAA module PID AC CTMP.

Yes =

GO to D3.

•

Is the temperature greater than 77

°

C (171

°

F)?

No =

GO to D4.

D3 CHECK COMPRESSOR TEMPERATURE AFTER COOLING

•

Open the hood and allow the underhood compartment to cool for one

Yes =

GO to D5.

hour.

•

With key ON, monitor IAA module PID AC CTMP.

No =

GO to D4.

•

Is the temperature greater than 77

°

C (171

°

F)?

D4 CHECK FOR COMPRESSOR OVERTEMPERATURE FAULT

•

Clear the continuous DTCs from the IAA module.

Yes =

GO to D5.

•

Operate the A/C system for five minutes and retrieve continuous DTCs

No =

System OK.

from the IAA module.

•

Does DTC B2518 Compressor Overtemperature Fault occur?

D5 CHECK A/C OVERTEMPERATURE SENSOR

•

With key OFF, disconnect A/C overtemperature sensor C1995 and

Yes =

REPLACE the IAA module.

measure the resistance between the terminals of the A/C overtemperature

REFER to

Section 412-04

.

sensor and compare the reading to the values below:

Actual Temperature (Approximate)

No =

REPLACE the A/C

compressor.

— 0

°

C (32

°

F) = 111,960-136,840 ohms

— 10

°

C (50

°

F) = 77,040-94,160 ohms

— 15

°

C (59

°

F) = 63,900-78,100 ohms

— 20

°

C (68

°

F) = 53,010-64,790 ohms

— 25

°

C (77

°

F) = 44,010-53,790 ohms

— 30

°

C (86

°

F) = 36,540-44,660 ohms

— 35

°

C (95

°

F) = 30,330-37,070 ohms

— 40

°

C (104

°

F) = 25,110-30,690 ohms

— 45

°

C (113

°

F) = 20,520-25,080 ohms

— 50

°

C (122

°

F) = 17,100-20,900 ohms

— 55

°

C (131

°

F) = 15,300-18,700 ohms

— 60

°

C (140

°

F) = 11,880-14,520 ohms

— 65

°

C (149

°

F) = 9,630-11,770 ohms

— 70

°

C (158

°

F) = 8,010-9,790 ohms

— 75

°

C (167

°

F) = 6,570-8,030 ohms

— 80

°

C (176

°

F) = 5,580-6,820 ohms

— 85

°

C (185

°

F) = 4,680-5,720 ohms

— 90

°

C (194

°

F) = 3,780-4,620 ohms

— 95

°

C (203

°

F) = 3,150-3,850 ohms

— 100

°

C (212

°

F) = 2,610-3,190 ohms

•

Is the resistance OK?

412-03-9

412-03-9

Air Conditioning

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST E: DTC B2606 A/C TEMPERATURE SENSOR OUT OF RANGE

TEST STEP

ACTION TO TAKE

E1 CHECK FOR COMPRESSOR OVERTEMPERATURE FAULT

•

Check the interface adapter assembly (IAA) module for continuous

Yes =

GO to E2.

diagnostic trouble codes (DTCs).

•

Does DTC B2518 Compressor Overtemperature Fault occur along

No =

GO to E3.

with DTC B2606 A/C Temperature Sensor Out of Range?

E2 CHECK CIRCUIT 3220 (PK) FOR SHORT TO GROUND

•

Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =

GO to E5.

module disconnected.

•

With key OFF, disconnect A/C overtemperature sensor C1995 and

No =

REPAIR the PK wire.

measure the resistance between BOB pin 47 and ground (BOB pin 80).

•

Is the resistance greater than 10,000 ohms?

E3 CHECK COMPRESSOR TEMPERATURE

•

With key ON, monitor IAA module PID AC CTMP.

Yes =

GO to E4.

•

Is the temperature equal to 215

°

C (419

°

F)?

No =

GO to E5.

E4 CHECK CIRCUITS 3220 (PK) AND 3221 (BR/LB) FOR OPEN(S)

•

Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes =

GO to E5.

module disconnected.

•

With key OFF, disconnect A/C overtemperature sensor C1995 and

No =

REPAIR the wire(s) in

measure the resistance of the PK wire between A/C overtemperature

question.

sensor C1995 and BOB pin 47.

•

With key OFF, measure the resistance of the BR/LB wire between A/C

overtemperature sensor C1995 and BOB pin 57.

•

Are the resistances less than 5 ohms?

E5 CHECK A/C OVERTEMPERATURE SENSOR

•

With key OFF, disconnect A/C overtemperature sensor C1995 and

Yes =

REPLACE the IAA module.

measure the resistance between the terminals of the A/C overtemperature

REFER to

Section 412-04

.

sensor and compare the reading to the values below:

Actual Temperature (Approximate)

No =

REPLACE the A/C

compressor.

— 0

°

C (32

°

F) = 111,960-136,840 ohms

— 10

°

C (50

°

F) = 77,040-94,160 ohms

— 15

°

C (59

°

F) = 63,900-78,100 ohms

— 20

°

C (68

°

F) = 53,010-64,790 ohms

— 25

°

C (77

°

F) = 44,010-53,790 ohms

— 30

°

C (86

°

F) = 36,540-44,660 ohms

— 35

°

C (95

°

F) = 30,330-37,070 ohms

— 40

°

C (104

°

F) = 25,110-30,690 ohms

— 45

°

C (113

°

F) = 20,520-25,080 ohms

— 50

°

C (122

°

F) = 17,100-20,900 ohms

— 55

°

C (131

°

F) = 15,300-18,700 ohms

— 60

°

C (140

°

F) = 11,880-14,520 ohms

— 65

°

C (149

°

F) = 9,630-11,770 ohms

— 70

°

C (158

°

F) = 8,010-9,790 ohms

— 75

°

C (167

°

F) = 6,570-8,030 ohms

— 80

°

C (176

°

F) = 5,580-6,820 ohms

— 85

°

C (185

°

F) = 4,680-5,720 ohms

— 90

°

C (194

°

F) = 3,780-4,620 ohms

— 95

°

C (203

°

F) = 3,150-3,850 ohms

— 100

°

C (212

°

F) = 2,610-3,190 ohms

•

Is the resistance OK?

412-03-10

412-03-10

Air Conditioning

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST F: A/C COMPRESSOR DOES NOT OPERATE (NO COOLING)

TEST STEP

ACTION TO TAKE

F1 CHECK A/C LOW PRESSURE SWITCH

•

With key OFF, disconnect A/C low pressure switch C1973 and connect a Yes =

GO to F2.

jumper wire between the P wire and PK/LB wire on A/C low pressure

switch C1973.

•

With key ON, set the mode select knob to the A/C position, the

No =

GO to F3.

temperature control knob to full cool position, and the blower control

knob to HIGH speed position.

•

Does the A/C compressor operate?

F2 CHECK A/C SYSTEM PRESSURE

•

Connect R-134a Manifold Gauge Set to charge ports and observe the

Yes =

REPLACE the A/C low

A/C system pressure (with jumper wire still connected to A/C low

pressure switch.

pressure switch C1973).

•

Is the pressure above 345 kPa (50 psi)?

No =

CHECK refrigerant system

for leaks. REPAIR as

necessary. RECHARGE the

A/C system.

F3 CHECK A/C LOW PRESSURE SWITCH STATUS

•

With key OFF, remove jumper wire and reconnect A/C low pressure

Yes =

GO to F7.

switch C1973.

•

With key ON, set the mode select knob to the A/C position and monitor

No =

GO to F4.

the interface adapter assembly (IAA) module PID AC LOWP.

•

Does the AC LOWP PID indicate DISABLE?

F4 CHECK A/C LOW PRESSURE SWITCH SIGNAL (12-VOLT

POWER) TO INTERFACE ADAPTER ASSEMBLY (IAA) MODULE

•

Connect the 104-Pin Breakout Box (BOB) to the IAA module and IAA

Yes =

REPLACE the IAA module.

module C1945.

REFER to

Section 412-04

.

•

With key ON, set the mode select knob to the A/C position and measure

No =

GO to F5.

the voltage between BOB pin 56 and ground (BOB pin 80).

•

Is the voltage greater than 10 volts?

F5 CHECK A/C SWITCHED POWER (12 VOLT) TO A/C LOW

PRESSURE SWITCH

•

With key OFF, disconnect A/C low pressure switch C1973.

Yes =

REPAIR the PK/LB wire

between A/C low pressure

switch C1973 and IAA

module C1945.

•

With key ON, set the mode select knob to the A/C position and measure

No =

GO to F6.

the voltage between the P wire on A/C low pressure switch C1973 and

ground.

•

Is the voltage greater than 10 volts?

F6 CHECK CIRCUIT 3232 (P) FOR OPEN

•

With key OFF, measure the resistance of the P wire between A/C low

Yes =

REPLACE the IAA module.

pressure switch C1973 and BOB pin 36.

REFER to

Section 412-04

.

•

Is the resistance less than 5 ohms?

No =

REPAIR the P wire.

F7 CHECK A/C COMPRESSOR PWM OUTPUT SIGNAL FROM

INTERFACE ADAPTER ASSEMBLY (IAA) MODULE

•

Connect the 104-Pin Breakout Box (BOB) to the IAA module and IAA

Yes =

GO to F9.

module C1945.

•

With key ON, set the mode select knob to the A/C position, the

No =

GO to F8.

temperature control knob to the full cool position, and measure the

frequency between BOB pin 46 and ground (BOB pin 80).

•

Is the frequency between 45 and 120 Hz?

F8 CHECK CIRCUIT 3026 (R/PK) FOR SHORT TO GROUND

(Continued)