Ford Ranger EV (2001 year). Manual — part 84

412-03-3

412-03-3

Air Conditioning

•

DTC B2518 Compressor Overtemperature Fault

DIAGNOSIS AND TESTING

Air Conditioning

— The interface adapter assembly (IAA) module

uses the A/C overtemperature sensor to

Diagnostic Trouble Code (DTC) Definition

monitor the temperature of the A/C

The following DTCs relate to the air conditioning

compressor. The IAA module sets DTC B2606

(A/C) system:

if the compressor temperature is greater than
77

°

C (171

°

F) for more than 5 seconds. If this

•

DTC P1461 A/C Pressure Sensor Circuit High

occurs, the A/C compressor will be disabled.

Input

The compressor will turn back on when the

— The interface adapter assembly (IAA) module

temperature decreases below 67

°

C (153

°

F).

uses the A/C pressure sensor to monitor the

•

DTC B2606 A/C Temperature Sensor Out of

pressure on the high side of the A/C

Range

compressor. The IAA module sets DTC P1461

— The interface adapter assembly (IAA) module

when the ambient temperature is greater than

uses the A/C overtemperature sensor to

18

°

C (64

°

F) and the pressure has been less

monitor the temperature of the A/C

than 80 kPa (12 psi) or greater than 3275 kPa

compressor. The IAA module sets DTC B2518

(475 psi) for more than 30 seconds.

if the compressor temperature is greater than

•

DTC B1946 A/C Post Evaporator Sensor Circuit

125

°

C (257

°

F) or less than -40

°

C (-40

°

F) for

Failure

more than 30 seconds. If this occurs, the A/C

— The interface adapter assembly (IAA) module

compressor will be disabled.

uses the evaporator temperature sensor to

Electrical Schematic

monitor the temperature of the A/C evaporator
core. The IAA module sets DTC B1946 if the

Refer to Electrical and Vacuum Troubleshooting

evaporator temperature is greater than 55

°

C

Manual, Cell 54, Air Conditioner/Heater for

(131

°

F) or less than -40

°

C (-40

°

F) for more

schematic and connector information.

than 30 seconds while the A/C is running.

Inspection and Verification

•

DTC B2119 Compressor Failure

Refer to

Section 100-07

.

— The interface adapter assembly (IAA) module

monitors the A/C compressor speed feedback
signal from the A/C inverter motor controller
(IMC) to determine if the A/C compressor is
not operating when it should be. If the IAA
module is commanding 14% duty cycle and
the compressor speed does not increase above
250 rpms for 30 seconds, DTC B2119 is set.

Symptom Chart

Symptom Chart

Condition

Possible Sources

Action

•

DTC P1461 A/C Pressure

•

Low refrigerant.

•

GO to

Pinpoint Test A.

Sensor Circuit High Input

•

Refrigerant leak.

•

Circuit(s).

•

Interface adapter assembly

(IAA) module.

•

A/C pressure sensor.

•

DTC B1946 A/C Post

•

Evaporator temperature

•

GO to

Pinpoint Test B.

Evaporator Sensor Circuit

sensor.

Failure

•

Circuit(s).

•

Interface adapter assembly

(IAA) module.

412-03-4

412-03-4

Air Conditioning

DIAGNOSIS AND TESTING (Continued)

Symptom Chart (Continued)

Condition

Possible Sources

Action

•

DTC B2119 Compressor

•

A/C inverter motor controller

•

GO to

Pinpoint Test C.

Failure

(IMC).

•

Circuit(s).

•

Interface adapter assembly

(IAA) module.

•

A/C compressor.

•

DTC B2518 Compressor

•

Overtemperature condition.

•

GO to

Pinpoint Test D.

Overtemperature Fault

•

A/C compressor (A/C

overtemperature sensor).

•

Interface adapter assembly

(IAA) module.

•

DTC B2606 A/C Temperature

•

Circuit(s).

•

GO to

Pinpoint Test E.

Sensor Out of Range

•

A/C compressor (A/C

overtemperature sensor).

•

Interface adapter assembly

(IAA) module.

•

A/C Compressor Does Not

•

Low refrigerant.

•

GO to

Pinpoint Test F.

Operate (No Cooling)

•

Refrigerant leak.

•

A/C low pressure switch.

•

Interface adapter assembly

(IAA) module.

•

Circuit(s).

•

A/C inverter motor controller

(IMC).

•

High-voltage power

distribution box (HVPDB).

•

High-voltage A/C fuse.

Special Tool(s)

Pinpoint Tests

R-134a Manifold Gauge Set 176-R032A or equivalent

Special Tool(s)

R-12/R-134a Air Conditioning Test Fitting Set

104-Pin Breakout Box (BOB) 418-049 (014-00950) or

412-DS028 (014-00333) or equivalent

equivalent

A/C Pressure Test Adapter 412-093 (T94P-19623-E)

Capacitor Discharge Tool 418-F213

(Continued)

PINPOINT TEST A: DTC P1461 A/C PRESSURE SENSOR CIRCUIT HIGH INPUT

TEST STEP

ACTION TO TAKE

A1 CHECK A/C PRESSURE

•

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

Yes =

System OK. CHECK wiring

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

for intermittent connections.

knob to HIGH speed position, and monitor the interface adapter assembly

CHECK the refrigerant

(IAA) module PID A/CPRES.

system for proper operation.

•

Is the pressure between 80 and 3275 kPa (12 and 475 psi)?

No =

If pressure is less than 80

kPa (12 psi), GO to A2.
If pressure is greater than

3275 kPa (475 psi), GO to

A3.

A2 CHECK A/C SYSTEM PRESSURE

•

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

Yes =

GO to A3.

A/C system pressure.

(Continued)

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)

412-03-6

412-03-6

Air Conditioning

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST B: DTC B1946 A/C POST EVAPORATOR SENSOR CIRCUIT FAILURE

TEST STEP

ACTION TO TAKE

•

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

GO to B4.

module disconnected.

•

With key OFF, disconnect evaporator temperature sensor C1972 and

No =

REPAIR the wire(s) in

measure the resistance of the BK/W wire between evaporator temperature

question.

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

Yes =

REPAIR the T/O wire.

(BOB pin 80).

•

Is the voltage greater than 0 volt?

No =

GO to B7.

B5 CHECK CIRCUIT 3063 (T/O) FOR SHORT TO GROUND

•

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

GO to B7.

module disconnected.

•

With key OFF, disconnect evaporator temperature sensor C1972 and

No =

REPAIR the T/O wire.

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

Yes =

System OK. CHECK wiring

10

°

C (50

°

F)?

for intermittent connections.

No =

GO to B7.

B7 CHECK EVAPORATOR TEMPERATURE SENSOR

•

With key OFF, disconnect evaporator temperature sensor C1972 and

Yes =

REPLACE the IAA module.

measure the resistance between the terminals of the evaporator

REFER to

Section 412-04

.

temperature sensor and compare the reading to the values below:

Actual Temperature (Approximate)

No =

REPLACE the evaporator

temperature sensor.

— 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

TEST STEP

ACTION TO TAKE

C1 CHECK A/C SWITCHED POWER OUTPUT FROM A/C

INVERTER MOTOR CONTROLLER (IMC) INTERLOCK

•

With key OFF, disconnect A/C C1902.

Yes =

GO to C4.

•

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

No =

GO to C2.

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.

Yes =

REPLACE A/C IMC.

•

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

No =

GO to C3.

the voltage between pin 7 (P wire) on A/C IMC C1947 and ground.

•

Is the voltage greater than 10 volts?

(Continued)