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A/C Compressor Clutch Field Coil C106

Measure the voltage between the A/C compressor clutch field coil C106, circuit 321 (GY/WH) and ground.

Is the voltage reading greater than 10 volts?

Yes

GO to

C14

.

No

GO to

C15

.

C14

CHECK FOR GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL

Measure the resistance between the A/C compressor clutch field coil C106, circuit 57 (BK) and ground.

Is the resistance less than 5 ohms?

Yes

GO to

C19

.

No

REPAIR circuit 57 (BK). TEST the system for normal operation.

C15

CHECK CIRCUIT 321 (GY/WH)

A/C Clutch Relay

Measure the resistance between the A/C clutch relay socket pin 5, circuit 321 (GY/WH) and the A/C compressor
clutch field coil C106, circuit 321 (GY/WH).

Is the resistance less than 5 ohms?

Yes

GO to

C16

.

No

REPAIR Circuit 321(GY/WH). TEST the system for normal operation.

Page 16 of 30

1999 F-150/250 Workshop Manual

8/16/2010

http://www.fordtechservice.dealerconnection.com/pubs/con...

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Содержание 1999 F-150

Страница 1: ...ster ARBST 010 00725 or equivalent New Generation Star NGS Tester 418 F048 007 00500 or equivalent R 134a Manifold Gauge Set 176 R032A or equivalent A C Pressure Test Adapter 412 093 T94P 19623 E R 12 R 134a Air Conditioning Test Fitting Set 412 DS028 014 00333 or equivalent Refrigeant Leak Detector 216 00001 or equivalent Radiator Heater Core Pressure Tester 014 R1072 or equivalent EEC V 104 Pin ...

Страница 2: ...otor air inlet duct door 10 Recirculated air inlet 11 19805 Blower motor 12 Vacuum to emission control 13 Vacuum from the engine intake manifold 14 19A563 A C vacuum check valve 15 19A566 A C vacuum reservoir tank and bracket 16 19B888 A C heater function selector switch 17 18476 Heater core 18 18A559 Floor panel door full vacuum position 19 Floor airflow 20 18A318 Vacuum control motor floor panel...

Страница 3: ...rtrain control module PCM is not listed for a communication concern turn the A C function selector switch to OFF and execute self test diagnostics for the PCM 6 If any PCM DTCs are retrieved and are related to the concern go to the Powertrain Control Module Diagnostic Trouble Code DTC Index to continue diagnostics 7 If no DTCs related to the concern are retrieved go to the Symptom Chart to continu...

Страница 4: ...switch GO to Pinpoint Test G CONDITIONS DETAILS RESULTS ACTIONS A1 CHECK THE SYSTEM AIRFLOW Place the heater blower motor switch in the HI position Check for proper airflow from each function selector switch position at engine idle and during engine speed acceleration Is there airflow from defroster outlets under all conditions Yes GO to A2 No If the airflow is from defroster outlets in all switch...

Страница 5: ... hose and the control assembly source hose from the A C vacuum check valve Check for vacuum Is vacuum available at both check valve ports Yes GO to A6 No GO to A5 A5 INSPECT THE VACUUM CHECK VALVE A C Vacuum Check Valve Inspect the A C vacuum check valve for an obstruction and or proper operation Airflow through the A C vacuum check valve should be in the direction toward the engine engine connect...

Страница 6: ...alve TEST the system for normal operation No RECONNECT the A C vacuum check valve GO to A7 A7 CHECK THE VACUUM RESERVOIR A C Vacuum Reservoir Tank Use a vacuum pump to leak test the A C vacuum reservoir tank Does the reservoir leak Yes REPLACE the A C vacuum reservoir tank TEST the system for normal operation No RECONNECT the A C vacuum reservoir tank GO to A8 A8 CHECK THE SUPPLY HOSE Function Sel...

Страница 7: ...to A11 A10 LEAK TEST THE CONTROL ASSEMBLY Function Selector Switch Vacuum Connect a vacuum pump to the function selector switch supply port and plug the control port that indicated a leak in Step A9 Select the function selector switch position that indicated a leak in Step A9 and then apply 51 kPa 15 in Hg of vacuum Does the vacuum drop exceed 1 68 kPa 1 2 in Hg per minute Yes REPLACE the function...

Страница 8: ... vacuum drop Yes REPAIR or REPLACE the vacuum jumper harness TEST the system for normal operation No REPAIR or REPLACE the function selector switch TEST the system for normal operation A13 REVIEW THE VEHICLE S HISTORY Review the vehicle s history Did the climate control system function properly prior to this concern Yes GO to A16 No GO to A14 A14 CHECK THE VACUUM HOSES TO DAMPER DOORS Connect a va...

Страница 9: ...HECK THE VACUUM CIRCUIT CONNECTIONS Check each vacuum hose connection to determine if it is partially connected or disconnected Is a vacuum hose disconnected or partially connected Yes RECONNECT the hose TEST the system for normal operation No GO to A18 A18 CHECK THE VACUUM HOSE Disconnect the suspect hose Plug one end of the hose and attach a vacuum pump to the other end Apply vacuum and observe ...

Страница 10: ...m to the door and or crank arm and check operation TEST the system for normal operation CONDITIONS DETAILS RESULTS ACTIONS B1 CHECK FOR PROPER ENGINE COOLANT LEVEL Check the engine coolant level when hot and cold Is the engine coolant at the proper level hot cold as indicated on the engine coolant recovery reservoir Yes GO to B2 No GO to B3 B2 CHECK FOR HOT WATER TO THE HEATER CORE INLET HOSE WARN...

Страница 11: ...the components separately at this time Does the engine cooling system including the radiator cap hold pressure Yes GO to B4 No PRESSURE TEST the heater core B4 CHECK THE HEATER CORE OUTLET HOSE FOR HOT WATER Feel the heater core outlet hose Is the heater core outlet hose cool or cold Yes TEST the heater core for a plugged or partially plugged condition No GO to Pinpoint Test D CONDITIONS DETAILS R...

Страница 12: ...or switch in the MAX A C position Does the PCM PID ACCS read ON Yes GO to C4 No GO to C5 C4 CHECK THE PID WAC WITH THE A C ON NOTE The outside temperature must be over 10 C 50 F PCM PID WAC Does the PCM PID WAC read ON Yes GO to C13 No REFER to the Powertrain Control Emissions Diagnosis PC ED manual C5 CHECK THE A C CYCLING SWITCH VOLTAGE A C Cycling Switch C139 Measure the voltage between the A C...

Страница 13: ...reading between 345 kPa 50 psi and 1724 kPa 250 psi Yes INSTALL a new A C cycling switch TEST the system for normal operation No CHECK for refrigerant leaks REFER to Leak Detection Using the Refrigerant Leak Detector in this section C8 CHECK CIRCUIT 347 BK YE Remove the fused jumper lead from the A C cycling switch C139 A C Cycling Switch C139 PCM C174 Connect the EEC V 104 Pin Breakout Box to the...

Страница 14: ... A C pressure cutoff switch C170 pin 3 circuit 348 VT and ground Is the voltage reading greater than 10 volts Yes GO to C10 No GO to C11 C10 CHECK THE A C PRESSURE CUTOFF SWITCH Connect a fused jumper lead between the A C pressure cutoff switch C170 pin 1 circuit 441 RD YE and pin 3 circuit 348 VT Measure the voltage between the A C cycling switch C139 pin 1 circuit 441 RD YE and ground Page 14 of...

Страница 15: ...348 VT Is the resistance less than 5 ohms Yes GO to C12 No REPAIR circuit 348 VT TEST the system for normal operation C12 CHECK CIRCUIT 295 LB PK Measure the voltage between the function selector switch C217 pin 1 circuit 295 LB PK and ground Is the voltage greater than 10 volts Yes INSTALL a new function selector switch TEST the system for normal operation No REPAIR circuit 295 LB PK TEST the sys...

Страница 16: ...cuit 57 BK and ground Is the resistance less than 5 ohms Yes GO to C19 No REPAIR circuit 57 BK TEST the system for normal operation C15 CHECK CIRCUIT 321 GY WH A C Clutch Relay Measure the resistance between the A C clutch relay socket pin 5 circuit 321 GY WH and the A C compressor clutch field coil C106 circuit 321 GY WH Is the resistance less than 5 ohms Yes GO to C16 No REPAIR Circuit 321 GY WH...

Страница 17: ...nce less than 5 ohms Yes INSTALL a new A C clutch relay TEST the system for normal operation No GO to C18 C18 CHECK CIRCUIT 331 PK YE PCM C174 Connect the EEC V 104 Pin Breakout Box to the PCM C174 Do not connect the breakout box to the PCM Measure the resistance between the A C clutch relay socket pin 2 circuit 331 PK YE and the breakout box pin 69 Is the resistance less than 5 ohms Yes INSTALL a...

Страница 18: ... THE A C ELECTRONIC BLEND DOOR ACTUATOR MOTOR SYSTEM Allow the engine to reach normal operating temperature Set the function selector switch to the MAX A C position Adjust the blend door potentiometer to full COOL left and check for cool air discharge Adjust the blend door potentiometer to full WARM right and check for warm air discharge Vary the blend door actuator control from full WARM to full ...

Страница 19: ...easure the voltage between the A C electronic blend door actuator motor C229 7 Circuit 295 LB PK and ground Is the voltage greater than 10 volts Yes GO to D5 No REPAIR Circuit 295 LB PK TEST the system for normal operation D5 CHECK CIRCUITS 436 R LG 437 Y LG AND 438 R W Blend Door Actuator Control C220 Measure the resistance between the following pins Blend Door Actuator Control C220 A C Electroni...

Страница 20: ...ar variation in the resistance between COOL and WARM Yes GO to D7 No REPLACE the blend door actuator control TEST the system for normal operation D7 CHECK CIRCUIT 57 BK Measure the resistance between the A C electronic blend door actuator motor C229 8 Circuit 57 BK and ground Is the resistance less than 5 ohms Yes REPLACE the A C electronic blend door actuator motor TEST the system for normal oper...

Страница 21: ...ormal operation E3 CHECK FUSE 23 40A Fuse 23 40A Is the fuse OK Yes GO to E7 No GO to E4 E4 CHECK THE BLOWER MOTOR SUPPLY FOR A SHORT TO GROUND A C Blower Motor C190 Measure the resistance between the A C blower motor C190 2 Circuit 399 BR Y and ground while selecting each mode on the function selector switch Is the resistance greater than 10 000 ohms in all function selector switch positions exce...

Страница 22: ... LG and ground Is the resistance greater than 10 000 ohms Yes REPLACE the A C blower motor relay TEST the system for normal operation No REPAIR Circuit 364 BK LG for a short TEST the system for normal operation E7 CHECK THE VOLTAGE TO THE A C BLOWER MOTOR A C Blower Motor C190 Measure the voltage between A C blower motor C190 2 Circuit 399 BR Y and ground while selecting each mode on the function ...

Страница 23: ...r motor C190 1 Circuit 261 O BK and the A C blower motor resistor C191 2 Circuit 261 O BK Is the resistance less than 5 ohms Yes REPAIR Circuit 57 BK for an open between the function selector switch C218 1 and ground TEST the system for normal operation No REPAIR Circuit 261 O BK for an open TEST the system for normal operation E10 CHECK CIRCUIT 364 BK LG FOR AN OPEN A C Blower Motor Relay Measure...

Страница 24: ...switch Is the voltage 10 volts or greater in all positions except OFF Yes GO to E14 No GO to E12 E12 CHECK THE VOLTAGE TO THE FUNCTION SELECTOR SWITCH Function Selector Switch C217 Measure the voltage between function selector switch C217 2 Circuit 296 W P and ground Is the voltage 10 volts or greater Yes GO to E13 No REPAIR Circuit 296 W P for an open TEST the system for normal operation E13 CHEC...

Страница 25: ... Pin 85 Circuit 57 BK and ground Is the resistance less than 5 ohms Yes GO to E15 No REPAIR Circuit 57 BK for an open TEST the system for normal operation E15 CHECK FOR AN OPEN IN THE A C BLOWER MOTOR FEED CIRCUIT Blower Motor C190 Measure the resistance between A C blower motor relay connector Pin 30 Circuit 399 BR Y and blower motor C190 Circuit 181 BR O Is the resistance less than 5 ohms Yes RE...

Страница 26: ... GO to F4 No GO to F3 F3 CHECK THE GROUND CIRCUIT A C Blower Motor Resistor Measure the resistance between A C blower motor resistor C191 3 Circuit 57 BK and ground Is the resistance less than 5 ohms Yes REPLACE the A C blower motor resistor RETEST the system for normal operation No REPAIR Circuit 57 BK TEST the system for normal operation F4 CHECK THE CIRCUIT RESISTANCE A C Blower Motor Resistor ...

Страница 27: ...F6 F6 CHECK THE BLOWER MOTOR SWITCH RESISTANCE Blower Motor Switch Measure the resistance between the blower motor switch terminals in each switch position Switch Position Continuity Between Terminals LO None Low medium 2 and 3 High medium 2 3 and 4 HI 1 2 and 4 Is the resistance between the specified terminals less than 5 ohms Yes CHECK for opens and shorts REPAIR as required Circuits 752 Y R or ...

Страница 28: ...h Measure the resistance between the blower motor switch terminals in each switch position Switch Position Continuity Between Terminals LO None Low medium 2 and 3 High medium 2 3 and 4 HI 1 2 and 4 Is the resistance between the specified terminals less than 5 ohms Yes REPAIR Circuit 57 BK RETEST the system for normal operation No REPLACE the blower motor switch RETEST the system for normal operati...

Страница 29: ...refer to Section 412 02 3 Install a short piece of heater water hose approximately 101 mm 4 inches long on each heater core tube 4 Fill the heater core and heater water hoses with water and install Plug BT 7422 B and adapter BT 7422 A from the Radiator Heater Core Pressure Tester in the heater water hose ends Secure the heater water hoses plug and adapter with hose clamps 5 Attach the pump and gau...

Страница 30: ...ting for 45 minutes close the gauge set valves and stop the vacuum pump Observe the low pressure gauge it should remain at the 101 kPa 30 in Hg mark If the low pressure gauge reading rises 34 or more kPa 10 or more in Hg of vacuum from the 101 kPa 30 in Hg position in 10 minutes a leak is indicated If a very small leak is suspected wait 30 minutes and observe the vacuum gauge If a small amount of ...

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