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Engine Cooling Fan: Diagnosis Ford Focus I

Cooling Fan 33 illustrations ~18147 words

TROUBLE SHOOTING

For cooling fan diagnosis, go to TEST KF: FAN CONTROL (FC) RELAY . DTCs P1474, P1477 and P1479 will set if a cooling fan control circuit failure is present. See step 1) under TEST KF test procedure.

On Escort and Mustang, also refer to TEST X: CONSTANT CONTROL RELAY MODULE (CCRM) . CCRM interfaces with the EEC-V system to provide control for cooling fan and A/C clutch. CCRM also contains EEC-V power relay, which provides battery power (VPWR) to the PCM and EEC-V system. Perform this test only when instructed by QUICK TEST or if directed by a system test.

DIAGNOSTIC FORMATS

QUICK TEST and SYSTEM TESTS are diagnostic formats used to test and service EEC-V system. QUICK TEST allows technician to identify problems and retrieve Diagnostic Trouble Codes (DTC). SYSTEM TESTS are used to check circuits, sensors and actuators.

Before starting any SYSTEM TEST, follow all steps under QUICK TEST to determine appropriate system test to perform. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-V system is okay.

DIAGNOSTIC TROUBLE CODES

During QUICK TEST, 3 types of Diagnostic Trouble Codes (DTCs) are retrieved: KOEO, KOER and Continuous Memory DTCs. See QUICK TEST for self-test procedures. DTCs may be cleared from PCM memory after DTCs have been recorded or fault has been repaired. See CLEARING DIAGNOSTIC TROUBLE CODES . If fault is still present after clearing DTCs, fault will reset.

RETRIEVING DIAGNOSTIC TROUBLE CODES

Fault codes are retrieved from EEC-V system through Data Link Connector (DLC). (Scheme 1) Self-diagnostic test procedures are for use with New Generation Star (NGS) scan tool. If a generic scan tool is used, ensure scan tool is certified to OBD-II standard.

ApplicationLocation
All ModelsBelow Instrument Panel, Right Of Steering Wheel

DATA LINK CONNECTOR (DLC) LOCATIONS

Scheme 1

Scheme 1
Scheme 1

KOEO & KOER On-Demand Self-Test Codes

Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in the same order it was set.

Note. If self-test will not activate or TOOL COMMUNICATION ERROR is received, go to TEST QA under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE.

CLEARING DIAGNOSTIC TROUBLE CODES

CAUTIONDO NOT disconnect vehicle battery to clear DTCs. This will erase operating information from Keep-Alive Memory (KAM). To clear KAM, see Keep Alive Random Access Memory (RAM) Reset Procedure .

QUICK TEST

Note. If vehicle has an emission compliance failure symptom, go to EMISSIONS COMPLIANCE under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article.

Quick Test is divided into 3 specialized test procedures that are functional tests of EEC-V system. All self-tests are completely menu driven using the New Generation Star (NGS) scan tool. The following procedures must be followed in sequence to avoid misdiagnosis

  1. «VISUAL CHECK»(ref-97420-S22072700932001050700000)
  2. «VEHICLE PREPARATION & EQUIPMENT HOOKUP»(ref-97420-S14168075732001050700000)
  3. «KEY ON ENGINE OFF (KOEO) ON-DEMAND SELF-TEST»(ref-97420-S05083176622001050700000)
  4. «KEY ON ENGINE RUNNING (KOER) ON-DEMAND SELF-TEST»(ref-97420-S18413912892001050700000)
  5. «CONTINUOUS MEMORY SELF-TEST»(ref-97420-S14688228452001050800000)

Complete QUICK TEST before performing any system tests. Record any DTCs retrieved. Service DTCs in the following order: KOEO DTCs, KOER DTCs and then Continuous Memory DTCs. After each service or repair procedure has been completed, always repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Generic Scan Tool

Ensure scan tool meets or exceeds OBD-II standard. Follow scan tool manufacturer's operating instructions to hook up equipment and record DTCs.

New Generation STAR (NGS) Scan Tool

Turn ignition off. Ensure proper memory (EPROM) card is inserted into NGS scan tool. Connect service connectors of adapter cable to vehicle Data Link Connector (DLC) and NGS scan tool. (Scheme 2) Connect NGS scan tool power supply cable to power and go to KOEO ON-DEMAND SELF-TEST.

Scheme 2

Scheme 2: New Generation STAR (NGS) Scan Tool
Scheme 2: New Generation STAR (NGS) Scan Tool

Performing Self-Test

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

  1. Select VEHICLE & ENGINE SELECTION menu.
  2. Select NEW VEHICLE, YEAR & MODEL.
  3. Select DIAGNOSTIC DATA LINK.
  4. Select PCM-POWERTRAIN CONTROL MODULE.
  5. Select DIAGNOSTIC TEST MODE.
  6. Select KOEO ON-DEMAND SELF-TEST.
  7. Turn ignition on.
  8. Follow operating instructions from scan tool menu.
  9. Record DTCs and perform appropriate system test. After test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

BPP, PSP & TCS Test Procedures

This test ensures EEC-V system is able to detect a change of state in brakelight switch, TCS and PSP switches. During KOER on-demand self-test, the brake pedal must be applied and then released, TCS must be cycled, and steering wheel must be turned at least 1/4 of a revolution.

To perform self-test, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

  1. Select VEHICLE & ENGINE SELECTION menu.
  2. Select NEW VEHICLE, YEAR & MODEL.
  3. Select DIAGNOSTIC DATA LINK.
  4. Select POWERTRAIN CONTROL MODULE.
  5. Select DIAGNOSTIC TEST MODE.
  6. Select KOER ON-DEMAND SELF-TEST.
  7. Start engine and allow to idle.
  8. Perform «BPP, PSP & TCS TEST PROCEDURES»(ref-97420-S30670228632001050800000) when instructed by scan tool.
  9. Record DTCs and perform appropriate system test. See SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. After KOER on-demand self-test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

To perform self-test, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

  1. Select VEHICLE & ENGINE SELECTION menu.
  2. Select NEW VEHICLE, YEAR & MODEL.
  3. Select DIAGNOSTIC DATA LINK.
  4. Select POWERTRAIN CONTROL MODULE.
  5. Select DIAGNOSTIC TEST MODE.
  6. Select RETRIEVE/CLEAR CONTINUOUS DTCs.
  7. Turn ignition switch to ON position.
  8. Follow operating instructions from scan tool menu.
  9. Record DTCs and perform appropriate system test. See SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. After continuous memory self-test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

An injector circuit fault can result in unrelated DTCs being received from PCM. If engine idles rough or Continuous Memory DTCs are present, turn ignition switch to ON position. Using scan tool, select INJxF PIDs from PID/DATA MONITOR & RECORD menu. There is one INJxF PID available for each engine cylinder and the "x" indicates the appropriate injector number (1-10). If any PID value indicates YES, an injector fault exists. Turn ignition switch to OFF position and disregard any DTCs that are present at this time. On natural gas models, go to TEST HA, step 60) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. On all other models, go to TEST H, step 56) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. If all PID values indicate NO, service DTCs that are present in the following order: KOEO DTCs, KOER DTCs and then continuous memory DTCs. See SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. After test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

Accessing OSR Test Mode

To enter OSR, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

  1. Select VEHICLE & ENGINE SELECTION menu.
  2. Select NEW VEHICLE, YEAR & MODEL.
  3. Follow operating instructions from scan tool menu.
  4. Select GENERIC OBD-II FUNCTIONS. Press TEST button if monitors are not complete.
  5. Start engine and allow to idle.
  6. Select ON-BOARD SYSTEM READINESS.

OUTPUT TEST MODE

WARNINGWhen all outputs are on, the electric fuel pump is briefly energized, ensure fuel system is intact and is not being serviced. When low or high speed fan control(s) are actuated, ensure fan blades are clear of obstructions.

Note. OUTPUT TEST MODE will default outputs to off after 10 minutes, and fuel pump to off after 7-10 seconds.

Accessing Output Test Mode

To access OUTPUT TEST MODE, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

  1. Select VEHICLE & ENGINE SELECTION menu.
  2. Select NEW VEHICLE, YEAR & MODEL.
  3. Follow operating instructions from scan tool menu.
  4. Select DIAGNOSTIC DATA LINK.
  5. Select POWERTRAIN CONTROL MODULE.
  6. Select DIAGNOSTIC TEST MODE.
  7. Select ACTIVE COMMAND MODE.
  8. Select OUTPUT TEST MODE.
  9. Turn ignition switch to ON position.
  10. Follow operating instructions from scan tool menu.
  11. Select START to turn outputs on.
  12. Select STOP to turn outputs off.
  13. Select either LOW SPEED FAN, HIGH SPEED FAN or ALL ON mode.

TEST KF: FAN CONTROL (FC) RELAY

Note. This article only tests the Fan Control (FC) relay and Constant Relay Control Module (CCRM) circuits. Other test may be referenced while performing electric cooling fan diagnosis. For complete Ford EEC-V system diagnosis, see SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE.

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Diagnostic Aids

This system test is for Crown Victoria, Escape 2.0L and 3.0L, Grand Marquis, Ranger 2.3L, Sable, Taurus, Town Car and Windstar only. On all models, PCM determines engine cooling fan requirements and controls fan operation through Low Fan Control (LFC) and High Fan Control (HFC) circuits. HFC relay is normally open.

Perform this test only when instructed by QUICK TEST or directed by other test procedures. This test is only intended to diagnose

  1. Wiring Harness Circuits (B+, FAN PWR & VPWR, Ignition START/RUN, LFC, MFC & HFC). (Scheme 3)- (Scheme 11)
  2. Low Speed Fan Control (LFC), Medium Speed Fan Control (MFC) & High Speed Fan Control (HFC) Relays
  3. Powertrain Control Module (PCM)

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11
  1. 1) KOEO & KOER DTC P1474, P1477 & P1479: Check VPWR (Or Ignition START/RUN On Escape) Voltage To Applicable Fan Control Relay DTC P1474 indicates a Low Speed Fan Control (LFC) primary circuit failure. DTC P1477 (Escape only) indicates a Medium Speed Fan Control (MFC) primary circuit failure. DTC P1479 indicates a High Speed Fan Control (HFC) primary circuit failure. Possible causes are: Open Or Shorted LFC, MFC Or HFC Circuit Open VPWR Circuit To LFC, MFC Or HFC Relay Faulty LFC, MFC Or HFC Relay Faulty PCM Turn ignition switch to OFF position. Disconnect appropriate fan control (LFC, MFC or HFC) relay. Turn ignition switch to ON position, engine off. Using a DVOM, measure voltage between negative battery terminal and VPWR terminal (ignition START/RUN terminal on Escape) at appropriate fan control relay harness connector. (Scheme 3)- (Scheme 11). If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit (IGN START/RUN circuit on Escape) to appropriate fan control relay.
  2. 2) Check For LFC, MFC Or HFC Circuit Cycling Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position, engine off. Connect a test light between VPWR terminal (ignition START/RUN terminal on Escape) and appropriate fan control relay harness connector LFC, MFC or HFC terminal. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Observe test light while commanding appropriate cooling fan speed (LFC, MFC or HFC) ON and OFF. On Escape, commanding low speed fan ON will also command medium fan ON. If test light turns on and off when appropriate fan control relay is commanded, replace affected fan control relay. If test light does not turn on and off when appropriate fan control relay is commanded, repeat this test step. If test light still does not turn on and off when appropriate fan control relay is commanded, turn ignition switch to OFF position, remove test light and go to next step.
  3. 3) Check LFC, MFC Or HFC Circuit For Short To Power In Harness Turn ignition switch to OFF position. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position, engine off. Using a DVOM, measure voltage between negative battery terminal and appropriate fan control relay harness connector LFC, MFC or HFC terminal. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair LFC, MFC or HFC circuit for short to power.
  4. 4) Check LFC, MFC Or HFC Circuit For Short To Ground In Harness Turn ignition switch to OFF position. Disconnect scan tool from DLC. Using a DVOM, measure resistance between negative battery terminal and appropriate fan control relay harness connector LFC, MFC or HFC terminal. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair LFC, MFC or HFC circuit for short to ground.
  5. 5) Check For Open LFC, MFC Or HFC Circuit Using a DVOM, measure resistance of LFC, MFC or HFC circuit between appropriate PCM harness connector terminal (LFC, MFC or HFC) and appropriate fan control relay harness connector LFC, MFC or HFC terminal. (Scheme 3)- (Scheme 11). If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in LFC, MFC or HFC circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 7). No test procedures have been omitted.
  6. 7) KOEO & KOER DTC P1479 (3.0L Escape): Check Ignition START/RUN Circuit Voltage To HFC Relay DTC P1479 indicates a High Speed Fan Control (HFC) primary circuit failure. Possible causes are: Open Or Shorted HFC Circuit Open VPWR Circuit To HFC Relay Faulty HFC Relay Faulty PCM Turn ignition switch to OFF position. Disconnect HFC relay No. 1 (MAIN FAN in battery junction box, located in engine compartment). Turn ignition switch to ON position. Using a DVOM, measure IGN START/RUN circuit voltage between chassis ground and appropriate HFC relay No. 1 harness connector terminal. (Scheme 7) If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in IGN START/RUN circuit.
  7. 8) Check For HFC Circuit Cycling At HFC Relay No. 1 Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Connect test light between HFC relay No. 1 IGN START/RUN circuit and HFC circuit terminals. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Observe test light while commanding high speed cooling fan ON and OFF. If test light turns on and off when high speed cooling fan is commanded, replace HFC relay No. 1. If test light does not turn on and off when high speed cooling fan is commanded, leave test light connected and go to next step.
  8. 9) Check For HFC Circuit Cycling With HFC Relay No. 2 Disconnected Ensure test light is still connected between HFC relay No. 1 IGN START/RUN circuit and HFC circuit terminals. Using scan tool, access OUTPUT TEST MODE and command cooling fans OFF. Disconnect HFC relay No. 2 (ADD FAN 2 in battery junction box). Using scan tool, command high speed cooling fan ON and OFF while observing test light. If test light turns on and off when high speed cooling fan is commanded, replace HFC relay No. 2. If test light does not turn on and off when high speed cooling fan is commanded, diagnose open, or short to PWR or ground in HFC circuit. Go to step 3).
  9. 10) Continuous Memory DTC P1474: Check LFC Circuit For Open Or Short To PWR Continuous Memory DTC P1474 indicates a Low Speed Control Fan (LFC) circuit failure occurred during vehicle operation. Possible causes are: Open LFC Relay VPWR Circuit (Ignition START/RUN Circuit On Escape) Open Or Shorted LFC Circuit Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure A/C and defroster are off. Disconnect cooling fan connector (both cooling fan connectors on models with 2 fans). Inspect connector(s) for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between negative battery terminal and low cooling fan harness connector LOW FAN PWR terminal (either harness connector on models with 2 fans). (Scheme 3)- (Scheme 11). Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command low speed fan ON. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake, wiggle and bend LFC circuit between PCM and LFC relay. Shake, wiggle and bend VPWR circuit (IGN START/RUN circuit on Escape) to LFC relay. Lightly tap on LFC relay to simulate road shock. If fault is indicated, turn ignition switch to OFF position. Isolate and repair open or short to PWR in wiring harness. If no fault is indicated, go to next step.
  10. 11) Check LFC Circuit For Short To Ground Turn ignition switch to ON position, engine off. Ensure cooling fan connector(s) are disconnected and test light is still connected. Using scan tool, command low speed fan OFF. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake, wiggle and bend LFC circuit between PCM and LFC relay. Lightly tap on LFC relay to simulate road shock. If fault is indicated, isolate and repair short to ground in wiring harness. If fault is not indicated, problem is intermittent. Go to TEST Z, step 1) in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 15). No test procedures have been omitted.
  11. 15) Continuous Memory DTC P1477 (Escape Only): Check MFC Circuit For Open Or Short To Power DTC P1477 indicates a Medium Speed Fan Control (MFC) primary circuit failure occurred during vehicle operation. Possible causes are: Open Or Shorted MFC Circuit Open VPWR Circuit To MFC Relay Faulty MFC Relay Faulty PCM Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure A/C and defroster are off. On Escape 2.0L, disconnect passenger side cooling fan connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between medium cooling fan harness connector MEDIUM FAN PWR circuit and ground circuit terminals. (Scheme 6) On Escape 3.0L, disconnect MFC relay (ADD FAN 3, located on driver's side of fan shroud). Connect a test light between MFC relay harness connector MFC circuit and IGN START/RUN circuit terminals. (Scheme 7) Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command low speed fan ON (this also commands medium fan ON). Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake, wiggle and bend LFC circuit between PCM and MFC relay. Shake, wiggle and bend IGN START/RUN circuit to MFC relay. On 2.0L, lightly tap on MFC relay to simulate road shock. If fault is indicated, turn ignition switch to OFF position. Isolate and repair open or short to PWR in wiring harness. If no fault is indicated, go to next step.
  12. 16) Check MFC Circuit For Short To Ground Turn ignition switch to ON position, engine off. Ensure cooling fan connector is disconnected and test light is still connected. Using scan tool, command low speed fan OFF. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake, wiggle and bend MFC circuit between PCM and MFC relay. On 2.0L, lightly tap on MFC relay to simulate road shock. If fault is indicated, isolate and repair short to ground in wiring harness. If fault is not indicated, problem is intermittent. Go to TEST Z, step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 20). No test procedures have been omitted.
  13. 20) Continuous Memory DTC P1479: Check HFC Circuit For Open Or Short To PWR Continuous Memory DTC P1479 indicates a High Speed Fan Control (HFC) circuit failure has occurred during vehicle operation. Possible causes are: Open HFC Relay VPWR Circuit Open Or Shorted HFC Circuit Turn ignition switch to OFF position. Ensure A/C and defroster are off. Disconnect cooling fan connector (both cooling fan connectors on models with 2 fans). Inspect connector(s) for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between negative battery terminal and cooling fan harness connector HIGH FAN PWR terminal (either connector on models with 2 fans, passenger's side for Escape 2.0L, and driver's side for Escape 3.0L). (Scheme 3)- (Scheme 11). Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan ON. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake, wiggle and bend HFC circuit between PCM and HFC relay. Shake, wiggle and bend VPWR circuit (IGN START/RUN circuit on Escape) to HFC relay (both HFC relays on Escape 3.0L). Lightly tap on HFC relay to simulate road shock. If fault is indicated, turn ignition switch to OFF position. Isolate and repair open or short to power in wiring harness. If fault is not indicated, go to next step.
  14. 21) Check HFC Circuit For Short To Ground Turn ignition switch to ON position, engine off. Ensure cooling fan connector(s) are disconnected and test light is still installed. Using scan tool, command high speed fan OFF. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake, wiggle and bend HFC circuit between PCM and HFC relay. Lightly tap on HFC fan control relay to simulate road shock. If fault is indicated, turn ignition switch to OFF position. Isolate and repair short to ground in wiring harness. If fault is not indicated, problem is intermittent. Go to TEST Z, step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 25). No test procedures have been omitted. NOTE: Perform test step 25) when directed from ELECTRIC COOLING FANS INOPERATIVE AT LOW, MEDIUM &/OR HIGH SPEED symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article.
  15. 25) One Or All Fans Inoperative: Check Fan Control Fault PIDs To Verify Fan Control Primary Circuits Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure A/C is off and engine is warmed to normal operating temperature. Turn ignition switch to ON position, engine off. Using scan tool, access PID/DATA MONITOR & RECORD menu. See «PARAMETER IDENTIFICATION MODE»(ref-97420-S33942728142001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Select LFCF, MFCF or HFCF PIDs for appropriate circuits (some early build Escape models will not have MFCF PID). If LFCF, MFCF or HFCF PIDs indicate YES, a primary circuit fault is present in that specific circuit. For 3.0L Escape models with an HFCF PID indicating YES, go to step 7). For all other models, go to step 1). If LFCF, MFCF or HFCF PIDs do not indicate YES, go to step 85) (for Escape), and go to step 30) (for all other models). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 30). No test procedures have been omitted.
  16. 30) Electric Cooling Fan Concern (With No DTCs): Check Fan Operation Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command cooling fan ON and check fan operation. On models with 2-speed fan, check both fan speeds. Wait 20 seconds after commanding high fan speed ON. Ensure cooling fan speed changes. On all models, if fan(s) operate properly, turn ignition switch to OFF position. Return to test that directed you here. If fan(s) do not operate properly, go to step 50) (Cougar, Focus with A/C and Windstar), go to step 41) (Focus without A/C), or go to next step for all other models.
  17. 31) Determine Fan Operation During operational check of both fan speeds, if cooling fan(s) operated at one speed only, go to step 40). If cooling fan(s) did not operate at any speed, go to next step. If one cooling fan is inoperative and other cooling fan operates normally, go to step 70).
  18. 32) Cooling Fan Will Not Operate At Any Speed: Command High Speed Fan ON & Check For Voltage To Cooling Fan Turn ignition switch to ON position, engine off. Ensure scan tool is connected and still in OUTPUT TEST MODE and cooling fan commanded OFF. Disconnect cooling fan connector (both cooling fan connectors on models with 2 fans). Using scan tool, command high speed cooling fan ON. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector HIGH FAN PWR circuit terminal (appropriate connector on models with 2 fans). (Scheme 3)- (Scheme 11). If voltage is 10 volts or less, turn ignition switch to OFF position and go to next step. If voltage is more than 10 volts, turn ignition switch to OFF position. For Sable and Taurus models, check fan braking relay and ground circuits, go to step 130). For all others, check cooling fan ground circuit, go to step 37).
  19. 33) Check B+ Circuit To HFC & LFC Relays Turn ignition switch to OFF position. Ensure cooling fan connector(s) are disconnected. Disconnect HFC and LFC relays. Using a DVOM, measure voltage between negative battery terminal and HFC and LFC relay harness connector B+ terminals. If both voltage measurements are more than 10 volts, go to next step. If either voltage measurement is 10 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse(s). If fuse(s) is okay, check for open in B+ circuit. Repair as necessary. If fuse(s) is blown, check B+ circuit for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
  20. 34) Check For Open In LOW FAN PWR & HIGH FAN PWR Circuits Using a DVOM, measure resistance of HIGH FAN PWR circuit between appropriate HFC relay harness connector terminal and appropriate cooling fan harness connector terminal. Using a DVOM, measure resistance of LOW FAN PWR circuit between appropriate LFC relay harness connector terminal and appropriate cooling fan harness connector terminal. If both resistance measurements are less than 5 ohms (7 ohms on Sable and Taurus), go to next step. If either resistance measurement is 5 ohms or more (7 ohms or more on Sable and Taurus), locate and repair open circuit. On Sable and Taurus, if open is in LOW FAN PWR circuit, check in-line fan dropping resistor. See «COOLING FAN RESISTOR LOCATIONS»(ref-97420-S37332989102001041200000) table. On all other models, repair open in affected circuit. Recheck cooling fan operation. COOLING FAN RESISTOR LOCATIONS Application Location Cougar In Engine Compartment, Below Driver Side Cooling Fan Focus With A/C, Sable & Taurus In Engine Compartment, In Wiring Harness Between Cooling Fans Windstar In Engine Compartment, Between Battery & Left Headlight
  21. 35) Command Low Speed Fan ON & Check For Voltage To Cooling Fans Reconnect HFC and LFC relays. Ensure cooling fan connector(s) are disconnected. Turn ignition switch to ON position, engine off. Using scan tool, access «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000). Command low speed fan ON. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector LOW FAN PWR terminal (appropriate connector on models with 2 fans). (Scheme 3)- (Scheme 11). If voltage is more than 10 volts, replace HFC relay and go to step 130) (Sable and Taurus models), or go to step 37) (all other models). If voltage is 10 volts or less, go to step 75) and follow procedure for low speed fan inoperative. After repair, repeat step 75) and follow procedure for high speed fan inoperative. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 37). No test procedures have been omitted.
  22. 37) Check Cooling Fan Ground Circuit Turn ignition switch to OFF position. Disconnect scan tool from DLC. Using a DVOM, measure resistance of ground circuit between negative battery terminal and cooling fan harness connector (either connector terminal for models with 2 fans). If resistance is less than 5 ohms, replace cooling fan(s). If resistance is 5 ohms or more, locate and repair open in ground circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.
  23. 40) Determine Which Fan Speed Is Operational If high speed fan was inoperative in step 31), go to step 46). If low speed fan was inoperative in step 31), go to next step.
  24. 41) Low Speed Fan Inoperative: Command Low Fan ON & Check Voltage To Cooling Fan Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC) if not previously connected. Turn ignition switch to ON position, engine off. Using scan tool, access «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) and command cooling fan off. Disconnect appropriate cooling fan connector (both connectors on models with 2 fans). Command low speed fan ON. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector LOW FAN PWR terminal (appropriate connector on models with 2 fans). (Scheme 3)- (Scheme 11). If voltage is 10 volts or less, turn ignition switch to OFF position and go to next step. If voltage is more than 10 volts, on Sable and Taurus models, replace cooling fan. On all other models, check ground circuit to cooling fan. If ground is okay, replace cooling fan and recheck cooling fan operation.
  25. 42) Check B+ Voltage To LFC Relay Disconnect LFC relay. Using a DVOM, measure voltage between negative battery terminal and LFC relay harness connector B+ terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse(s). If fuse(s) is okay, check for open in B+ circuit. Repair as necessary. If fuse(s) is blown, check B+ circuit for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
  26. 43) Check For Open In Low Fan PWR Circuit Using a DVOM, measure resistance of LOW FAN PWR circuit between LFC relay harness connector and appropriate cooling fan harness connector(s). If resistance is less than 5 ohms (7 ohms on Sable and Taurus), go to next step. If resistance measurement is 5 ohms or more (7 ohms or more on Sable and Taurus), locate and repair open circuit. On Sable and Taurus, check in-line fan dropping resistor. See «COOLING FAN RESISTOR LOCATIONS»(ref-97420-S37332989102001041200000) table. On all other models, repair open in affected circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 46). No test procedures have been omitted.
  27. 46) High Speed Fan Inoperative: Command High Speed Fan ON & Check For Voltage To Cooling Fan Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC) if not previously connected. Turn ignition switch to ON position, engine off. Using scan tool, access «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) and command cooling fan off. Disconnect appropriate cooling fan connector (both connectors on models with 2 fans). Command high speed fan ON. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector HIGH FAN PWR terminal (appropriate connector on models with 2 fans). (Scheme 3)- (Scheme 11). If voltage is 10 volts or less, turn ignition switch to OFF position and go to next step. If voltage is more than 10 volts, on Sable and Taurus models, replace cooling fan. On all other models, check ground circuit to cooling fan. If ground is okay, replace cooling fan and recheck cooling fan operation.
  28. 47) Check B+ Voltage To HFC Relay Disconnect HFC relay. Using a DVOM, measure voltage between negative battery terminal and HFC relay harness connector B+ terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse(s). If fuse(s) is okay, check for open in B+ circuit. Repair as necessary. If fuse(s) is blown, check B+ circuit for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
  29. 48) Check For Open High Fan PWR Circuit Turn ignition switch to OFF position. Using a DVOM, measure resistance of HIGH FAN PWR circuit between HFC relay harness connector and appropriate cooling fan harness connector. If resistance is less than 5 ohms, go to step 75). If resistance is 5 ohms or more, repair open in HIGH FAN PWR circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 48) to step 50). No test procedures have been omitted.
  30. 50) Low &/Or High Speed Cooling Fan Inoperative (Cougar, Focus With A/C & Windstar): Check For B+ Voltage To HFC & LFC Relays If one cooling fan is inoperative and other cooling fan operates normally, go to step 70). Turn ignition switch to OFF position. Disconnect LFC and HFC relays. Using a DVOM, measure voltage between negative battery terminal and both LFC and HFC relay harness connector B+ terminals. (Scheme 4)and (Scheme 11). If both voltage measurements are more than 10.5 volts, go to next step. If any voltage measurement is 10.5 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse(s). If fuse(s) is okay, check for open in B+ circuit. Repair as necessary. If fuse(s) is blown, check B+ and FAN PWR circuits for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
  31. 51) Check For Open Fan PWR Circuit, Fan Ground & Internal Fan Circuits Ensure ignition switch is turned to OFF position. Using a DVOM, measure resistance between negative battery terminal and both LFC and HFC relay harness connector FAN PWR terminals. If both resistance measurements are less than 15 ohms, go to next step. If either resistance measurement is 15 ohms or more, go to step 56).
  32. 52) Check FAN PWR Circuit For Short To Ground Disconnect both cooling fan harness connectors. Using a DVOM, measure resistance between negative battery terminal and HFC relay harness connector FAN PWR terminal. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, locate and repair short to ground in FAN PWR circuit. Recheck cooling fan operation.
  33. 53) Check HFC & LFC Relay Operation Leave cooling fans disconnected. Reconnect HFC and LFC relays. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Perform appropriate following test procedure as follows: HFC Relay Using scan tool, command high speed fan ON. Wait 15 seconds. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector FAN PWR terminal (either connector). Voltage should be more than 10.5 volts. LFC Relay Using scan tool, command low speed fan ON. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector FAN PWR terminal (either connector). Voltage should be more than 10 volts. If both voltage measurements are as specified, replace cooling fan(s). If either voltage measurement is not as specified, note which fan speed is inoperative and go to step 75). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 56). No test procedures have been omitted.
  34. 56) Check For Open FAN PWR Circuit Between Cooling Fan, & HFC & LFC Relays Turn ignition switch to OFF position. Disconnect cooling fan connector (either connector). Using a DVOM, measure resistance of FAN PWR circuit between cooling fan harness connector and both HFC and LFC relay harness connectors. (Scheme 4)and (Scheme 11). If both resistance measurements are less than 15 ohms, go to next step. If either resistance measurement is 15 ohms or more, locate and repair open in FAN PWR circuit. If open is only between LFC relay and cooling fan, check in-line fan dropping resistor. See «COOLING FAN RESISTOR LOCATIONS»(ref-97420-S37332989102001041200000) table. Recheck cooling fan operation.
  35. 57) Check Cooling Fan Ground Circuit Using a DVOM, measure resistance between negative battery terminal and cooling fan harness connector ground circuit terminal. If resistance is less than 5 ohms, replace inoperative cooling fan(s). If resistance is 5 ohms or more, locate and repair open in ground circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 57) to step 60). No test procedures have been omitted. NOTE: Perform test step 60) when directed from ELECTRIC COOLING FAN ALWAYS ON symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article.
  36. 60) Low, Medium &/Or High Speed Cooling Fan Always Runs (No DTCs): Ensure Fan Is Not On Because Of A/C High Pressure Switch Input To PCM Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Start engine. Using scan tool, access PID/DATA MONITOR & RECORD menu. See «PARAMETER IDENTIFICATION MODE»(ref-97420-S33942728142001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Select ACP PID. If ACP PID value indicates OPEN, go to step 65). If ACP PID indicates CLOSED, Powertrain Control Module (PCM) will turn cooling fan on when A/C high pressure switch is "closed". Leave engine running and go to next step.
  37. 61) Check A/C High Pressure Switch (Normally Open Contacts) Disconnect A/C high pressure switch. Using scan tool, access PID/DATA MONITOR & RECORD menu. Select ACP PID. If ACP PID indicates CLOSED, turn ignition switch to OFF position and go to next step to check A/C high pressure switch input to PCM. If ACP PID indicates OPEN, turn ignition switch to OFF position and reconnect A/C high pressure switch. Check A/C high pressure switch and A/C system for proper operation. Service A/C system as necessary. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  38. 62) Check ACPSW Circuit For Short To Ground In Harness Disconnect scan tool from DLC. Disconnect PCM connector. Using a DVOM, measure resistance between PCM harness connector terminal No. 86 and chassis ground. See appropriate WIRING DIAGRAMS article in ENGINE PERFORMANCE. If resistance is more than 10 k/ohms, replace PCM. If resistance is 10 k/ohms or less, repair short to ground in ACPSW circuit. NOTE: Perform test step 63) when directed from ELECTRIC COOLING FAN ALWAYS ON symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article.
  39. 63) Low &/Or High Speed Cooling Fan Always Runs (No DTCs): Ensure Fan Is Not On Because Of A/C High Pressure Sensor Input To PCM Turn ignition switch to OFF position. Turn A/C off. Connect scan tool to Data Link Connector (DLC). Start engine. Using scan tool, access PID/DATA MONITOR & RECORD menu. See «PARAMETER IDENTIFICATION MODE»(ref-97420-S33942728142001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Select ACP V PID. If ACP V PID voltage reading is 3 volts or less, input is not causing cooling fan to operate, go to step 65). If ACP V PID voltage reading is more than 3 volts, turn ignition switch to OFF position. Check A/C system for high system pressure. Service A/C system as necessary. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 63) to step 65). No test procedures have been omitted.
  40. 65) Check LFC Relay Always Closed Ensure A/C and defroster are off. Turn ignition switch to OFF position. Disconnect LFC relay. Turn ignition switch to ON position, engine off. Check cooling fan operation. If cooling fan stops, go to step 80). If cooling fan continues to run on Focus without A/C and Ranger models, repair short to power in FAN PWR circuit. If cooling fan continues to run on all other models, go to next step.
  41. 66) Check HFC Relay Leave LFC relay disconnected. Turn ignition switch to OFF position. On all models, disconnect HFC relay (HFC relay No. 1 on Escape 3.0L models). Turn ignition switch to ON position. Check cooling fan operation. If cooling fan stops, turn ignition switch to OFF position and go to step 80). If cooling fan remains on, perform appropriate following test procedure as follows: Cougar, Focus, Sable, Taurus, Ranger & Windstar Turn ignition switch to OFF position. Repair short to power in FAN PWR circuit. Recheck cooling fan operation. Escape 2.0L Turn ignition switch to OFF position and go to step 68) Escape 3.0L If passenger side cooling fan continues to operate, repair short to power in LOW FAN PWR circuit. If driver side cooling fan continues to operate, repair short to power in HIGH FAN PWR circuit. Continental, Crown Victoria, Grand Marquis & Town Car Go to next step.
  42. 67) Check Low Fan PWR Circuit For Short To Power In Harness Turn ignition switch to OFF position. Disconnect cooling fan connector(s). Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and cooling fan harness connector LOW FAN PWR terminal. (Scheme 3)and (Scheme 5). If voltage is less than one volt, repair short to power in HIGH FAN PWR circuit. Recheck cooling fan operation. If voltage is one volt or more, repair short to power in LOW FAN PWR circuit. Recheck cooling fan operation.
  43. 68) Check MFC Relay Ensure LFC and HFC relays are disconnected. Turn ignition switch to OFF position. Disconnect MFC relay. Turn ignition switch to ON position, engine off. Check cooling fan operation. If cooling fan stops, turn ignition switch to OFF position and replace MFC relay. Recheck cooling fan operation. If both cooling fans continue to operate, turn ignition switch to OFF position and repair short to power in HIGH FAN PWR circuit. (Scheme 6) If only one cooling fan continues to operate, turn ignition switch to OFF. Repair short to power to appropriate fan in either LOW FAN PWR or MEDIUM FAN PWR circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 68) to step 70). No test procedures have been omitted.
  44. 70) One Cooling Fan Inoperative & Other Cooling Fan Operates Normal (No DTCs): Check For Open In Ground Circuit To Inoperative Cooling Fan Turn ignition switch to OFF position. Disconnect inoperative cooling fan connector. Perform appropriate following test procedure as follows: Sable & Taurus Disconnect cooling fan braking relay. Using a DVOM, measure resistance of ground circuit between cooling fan harness connector and cooling fan braking relay harness connector. All Other Models Using a DVOM, measure resistance of ground circuit between chassis ground and cooling fan harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit. Recheck cooling fan operation.
  45. 71) Command Cooling Fan ON & Check For Voltage To Fan Disconnect remaining cooling fan. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan ON. Using a DVOM, measure voltage between negative battery terminal and inoperative cooling fan harness connector HIGH FAN PWR terminal. (Scheme 3)- (Scheme 11). If voltage is more than 10 volts, replace inoperative cooling fan. Recheck cooling fan operation. If voltage is 10 volts or less, locate and repair open circuit between inoperative cooling fan and splice to other cooling fan. Recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 71) to step 75). No test procedures have been omitted.
  46. 75) Attempt To Access Parameter Identifications (PIDs) With Scan Tool An inoperative low, medium or high speed cooling fan can be caused by a primary circuit fault, even though a DTC was not set. Check if scan tool being used is capable of accessing PID values while in OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. If PID access is possible, check primary circuits, go to next step. If PID access is not possible and low speed fan is inoperative or cooling fan is inoperative for single speed cooling fans, go to step 77). On Escape models, if medium speed fan is inoperative, go to step 78). On all models, if high speed fan is inoperative, go to step 79).
  47. 76) Check Operation Of Low, Medium &/Or High Speed Fan Primary Circuits Reconnect all cooling fan and relay connectors. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Perform appropriate test procedure as follows: Low Speed Fan Inoperative (Cooling Fan Inoperative For Single Speed Cooling Fans) Using scan tool, select LFC and LFCF PIDs. With low speed fan commanded off, LFC PID should read OFF and LFCF PID should read NO. Command low speed fan ON. LFC PID should now read ON and LFCF PID should still read NO. Medium Speed Fan Inoperative (Escape) Using scan tool, select MFC and MFCF PIDs. If MFC and MFCF PIDs are not available, go to step 78). With medium speed fan commanded off, MFC PID should read OFF and MFCF PID should read NO. Command medium speed fan ON. MFC PID should now read ON and MFCF PID should still read NO. High Speed Fan Inoperative Using scan tool, select HFC and HFCF PIDs. With high speed fan commanded off, HFC PID should read OFF and HFCF PID should read NO. Command high speed fan ON. HFC PID should read ON and HFCF PID should still read NO. If LFCF, MFCF and HFCF PIDs indicated YES with fan commanded ON or OFF, an LFC, MFC or HFC primary circuit fault is detected. Go to step 1) and perform appropriate diagnosis for DTC P1474 (if LFCF PID reading was YES), DTC 1477 (if MFCF reading was YES), or DTC P1479 (if HFCF PID reading was YES). If LFCF, MFCF or HFCF PIDs indicated NO with fan commanded ON and OFF, LFC, MFC or HFC primary circuits are okay. Replace appropriate LFC relay (if low speed fan is inoperative), MFC relay (if medium fan is inoperative) or HFC relay (if high speed fan is inoperative). Ensure applicable FAN PWR circuit is not shorted to ground. Recheck cooling fan operation.
  48. 77) Check Operation Of Low Speed Fan Primary Circuits Reconnect all cooling fan and relay connectors, as necessary. Turn ignition switch to ON position, engine off. Connect a test light between LFC relay harness connector VPWR and LFC terminals. (Scheme 3)- (Scheme 11). Using scan tool, access OUTPUT TEST MODE. Observe test light while commanding low speed fan ON then OFF. If test light turns on then off, LFC primary circuits are okay. Replace LFC relay. Ensure FAN PWR circuit is not shorted to ground. Recheck cooling fan operation. If test light did not turn on then off, LFC primary circuit fault is detected. Turn ignition switch to OFF position, go to step 1) and perform diagnosis for DTC P1474.
  49. 78) Check Operation Of Medium Speed Fan Primary Circuits Reconnect all cooling fan and relay connectors, as necessary. Turn ignition switch to ON position, engine off. Connect a test light between MFC relay harness connector VPWR and MFC terminals. Using scan tool, access OUTPUT TEST MODE. Observe test light while commanding medium speed fan ON then OFF. If test light turns on then off, MFC primary circuits are okay. Replace MFC relay. Ensure FAN PWR circuit is not shorted to ground. Recheck cooling fan operation. If test light did not turn on then off, MFC primary circuit fault is detected. Turn ignition switch to OFF position, go to step 1) and perform diagnosis for DTC P1477.
  50. 79) Check Operation Of High Speed Fan Primary Circuits Reconnect all cooling fan and relay connectors, as necessary. Turn ignition switch to ON position, engine off. Connect a test light between HFC relay harness connector VPWR and HFC terminals. Using scan tool, access OUTPUT TEST MODE. Observe test light while commanding high speed fan ON (wait 15 seconds) then OFF. If test light turns on then off, HFC primary circuits are okay. Replace HFC relay. Ensure FAN PWR circuit is not shorted to ground. Recheck cooling fan operation. If test light did not turn on then off, HFC primary circuit fault is detected. Turn ignition switch to OFF position, go to step 1) and perform diagnosis for DTC P1479.
  51. 80) Check Operation Of Low Or High Speed Fan Primary Circuits An inoperative high speed or low speed fan can be caused by a primary circuit fault, even though a DTC was not set. Reconnect all cooling fan and relay connectors. Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Perform appropriate test procedure as follows: Fan Stops Running With LFC Relay Disconnected Using scan tool, select LFC and LFCF PIDs from PID/DATA MONITOR & RECORD menu. Command low speed fan OFF. LFC PID should read OFF and LFCF PID should read NO. Fan Stops Running With HFC Relay Disconnected Using scan tool, select HFC and HFCF PIDs from PID/DATA MONITOR & RECORD menu. Command high speed fan OFF. HFC PID should read OFF and HFCF PID should read NO. If LFCF or HFCF PIDs indicated YES with fan commanded OFF, an LFC or HFC primary circuit fault is detected. Go to step 1) and perform appropriate diagnosis for DTC P1474 (if LFCF PID was YES), or DTC P1479 (if HFCF PID was YES). If LFCF or HFCF PIDs indicated NO with fan commanded OFF, LFC and HFC primary circuits are okay. Replace LFC relay (if fan stopped running with LFC relay disconnected), or HFC relay (if fan stopped running with HFC relay disconnected). Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 80) to step 85). No test procedures have been omitted.
  52. 85) Electric Cooling Fan Concern - Escape (No DTCs): Check Fan Operation Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Observe cooling fan operation while commanding low speed cooling fan ON. Both cooling fans should be operating at low speed (medium speed for 3.0L Escape). Using scan tool, command high speed cooling fan ON. Both cooling fans should be operating at high speed. If cooling fans operate as specified, return to SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article. If cooling fans do not operate as specified, go to step 86) for 2.0L Escape. For 3.0L Escape, perform appropriate test procedure as follows: If both cooling fans are inoperative when low speed fan is commanded ON, but both cooling fans operate when high speed fan is commanded ON, go to step 95). If both cooling fans are inoperative when low speed fan is commanded ON and only one cooling fan operates when high speed fan is commanded ON, leave scan tool connected and go to step 105). If both cooling fans operate when low speed fan is commanded ON, but only one cooling fan operates when high speed fan is commanded ON, go to step 115). If only one cooling fan operates when low speed fan is commanded ON, but both cooling fans operate when high speed fan is commanded ON, go to step 124).
  53. 86) Check B+ Voltage To LFC, MFC &/Or HFC Relays (Escape 2.0L) Refer to cooling fan diagnosis table to determine cooling fan and/or fan speeds to diagnose. See «COOLING FAN DIAGNOSIS (ESCAPE 2.0L)»(ref-97420-S25036085662001041300000) table. Disconnect appropriate LFC, MFC and/or HFC relays. Using a DVOM, measure B+ circuit voltage between chassis ground and appropriate LFC, MFC and/or HFC relay harness connector(s). (Scheme 6) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse(s). If fuse(s) is okay, check for open in B+ circuit. Repair as necessary. If fuse(s) is blown, check B+ and FAN PWR circuits for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation. COOLING FAN DIAGNOSIS (ESCAPE 2.0L) Inoperative Cooling Fan Inoperative Output Test Mode Component(s) To Check Both Low & High LFC, MFC & HFC Relays; Both Cooling Fans Both Low Only LFC & MFC Relays; Both Cooling Fans Both High Only HFC Relay; Both Cooling Fans Driver's Side Low & High LFC & HFC Relays; Driver's Side Cooling Fan Driver's Side Low Only LFC Relay; Driver's Side Cooling Fan Driver's Side High Only HFC Relay; Driver's Side Cooling Fan Passenger's Side Low & High MFC & HFC Relays; Passenger's Side Cooling Fan Passenger's Side Low Only MFC Relay; Passenger's Side Cooling Fan Passenger's Side High Only HFC Relay; Passenger's Side Cooling Fan
  54. 87) Check Continuity Of Appropriate FAN PWR Circuits Disconnect appropriate cooling fan harness connectors. Refer to «COOLING FAN DIAGNOSIS (ESCAPE 2.0L)»(ref-97420-S25036085662001041300000) table. Using a DVOM, measure resistance of LOW, MEDIUM and/or HIGH FAN PWR circuit(s) between appropriate cooling fan harness connector(s) and appropriate fan control relay harness connector(s). If resistance(s) is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected circuits. Recheck cooling fan operation.
  55. 88) Check For Power To Cooling Fans Reconnect LFC, MFC and/or HFC relays, as applicable. Disconnect both cooling fans, if not already disconnected. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Perform appropriate test procedure as follows: Low &/Or Medium Speed Cooling Fan Inoperative Command low speed fan ON. Using a DVOM, measure LOW FAN PWR and/or MEDIUM FAN PWR circuit voltage between chassis ground and appropriate cooling fan harness connector. High Speed Cooling Fan Inoperative Command high speed fan ON. Using a DVOM, measure HIGH FAN PWR circuit voltage between chassis ground and appropriate cooling fan harness connector. If voltage measurement(s) is more than 10 volts, go to next step. If either voltage measurement is 10 volts or less, go to step 75) to check appropriate cooling fan(s) primary circuit.
  56. 89) Check Cooling Fan(s) GND Circuit Turn ignition switch to OFF position. Disconnect scan tool from DLC. Using a DVOM, measure resistance of GND circuit between chassis ground and appropriate cooling fan harness connector. If resistance is 5 ohms or more, repair open in GND circuit. Recheck cooling fan(s) operation. If resistance is less than 5 ohms, replace cooling fan(s) that were inoperative in step 85). Recheck cooling fan(s) operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 89) to step 95). No test procedures have been omitted.
  57. 95) Measure Resistance Of Low Fan GND Circuit Between Passenger Side Cooling Fan & MFC Relay (Escape 3.0L) Ensure ignition switch is turned to OFF position. Disconnect MFC relay (ADD FAN 3, located on driver's side of fan shroud). Disconnect passenger side cooling fan harness connector. Using a DVOM, measure resistance of LOW FAN GND circuit between MFC relay and passenger side cooling fan harness connectors. (Scheme 7) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in LOW FAN GND circuit between MFC relay and splice to HFC No. 2. Recheck cooling fan(s) operation.
  58. 96) Measure Resistance Of Violet/Pink Wire Between MFC Relay & HFC Relay No. 1 Ensure ignition switch is turned to OFF position. Reconnect passenger side cooling fan harness connector. Disconnect HFC relay No. 1 (MAIN FAN in battery junction box, located in engine compartment). Using a DVOM, measure resistance of Violet/Pink wire between MFC relay harness connector terminal No.87 and HFC relay No. 1 harness connector terminal No. 87A. DO NOT test resistance of Violet/Pink wire that has in-line LOW SPEED RESISTOR. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/Pink wire between MFC and HFC relays. Recheck cooling fan(s) operation.
  59. 97) By-Pass MFC Relay & Check Cooling Fan Operation Ensure ignition switch is turned to OFF position. Connect scan tool to DLC. Reconnect HFC relay No. 1. Connect a jumper wire between MFC relay harness connector terminals No. 30 (LOW FAN GND circuit to passenger side cooling fan) and 87 (medium speed fan control output circuit to HFC relay No. 1). (Scheme 7) Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Command low speed fan ON. If both fans operate, turn ignition switch to OFF position and replace MFC relay. Recheck cooling fan(s) operation. If both fans still do not operate, turn ignition switch to OFF position and go to next step.
  60. 98) Check Normally Closed Contacts Of HFC Relay No. 1 Ensure ignition switch is turned to OFF position. Disconnect HFC relay No. 1. Using a DVOM, measure resistance between HFC relay terminals No. 30 and 87A. If resistance is less than 5 ohms, no fault is indicated, problem may be intermittent. Repeat steps 95) - 98). If results are the same, return to SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 98) to step 105). No test procedures have been omitted.
  61. 105) Check Cooling Fans For Proper Operation If driver's side cooling fan did not operate in step 85), go to next step. If passenger side cooling fan did not operate in step 85), go to step 110).
  62. 106) Command High Speed Fan ON & Check For B+ To Driver's Side Cooling Fan Turn ignition switch to OFF position. Disconnect driver's side cooling fan. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Command high speed fan ON. Using a DVOM, measure voltage between chassis ground and driver's side cooling fan harness connector HIGH FAN PWR circuit terminal. (Scheme 7) If voltage is more than 10.5 volts turn ignition switch to OFF position and go to next step. If voltage is 10.5 volts or less, turn ignition switch to OFF position and go to step 108).
  63. 107) Check Driver's Side Cooling Fan GND Circuit Ensure ignition switch is turned to OFF position. Using a DVOM, measure resistance between chassis ground and driver's side cooling fan harness connector GND circuit terminal. If resistance is less than 5 ohms, replace driver's side cooling fan. Recheck cooling fans operation. If resistance is 5 ohms or more, repair open in GND circuit. Recheck cooling fans operation.
  64. 108) Measure Resistance Of HIGH FAN PWR Circuit Ensure ignition switch is turned to OFF position. Using a DVOM, measure resistance of HIGH FAN PWR circuit between driver's side cooling fan and HFC relay No. 1 harness connectors. If resistance is less than 5 ohms, replace HFC relay No. 1. Recheck cooling fan operation. If resistance is 5 ohms or more, repair open in HIGH FAN PWR circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 108) to step 110). No test procedures have been omitted.
  65. 110) Check B+ To LFC Relay Turn ignition switch to OFF position. Disconnect LFC relay (ADD FAN in battery junction box). Using a DVOM, measure B+ circuit voltage between negative battery cable and LFC relay harness connector. (Scheme 7) If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for open in B+ circuit. Check appropriate B+ circuit fuse. If fuse is okay, check for open in B+ circuit. Repair as necessary. If fuse is blown, check B+ and FAN PWR circuits for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
  66. 111) Command Low Speed Fan ON & Check For B+ To Passenger's Side Cooling Fan Turn ignition switch to OFF position. Reconnect LFC relay. Disconnect passenger's side cooling fan. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Command low speed fan ON. Using a DVOM, measure voltage between chassis ground and passenger's side cooling fan harness connector LOW FAN PWR circuit terminal. If voltage is more than 10.5 volts turn ignition switch to OFF position and go to next step. If voltage is 10.5 volts or less, turn ignition switch to OFF position and go to step 113).
  67. 112) Measure Resistance Of LOW FAN GND Circuit Ensure ignition switch is turned to OFF position. Using a DVOM, measure resistance of LOW FAN GND circuit between HFC relay and passenger's side cooling fan harness connector. If resistance is less than 5 ohms, replace passenger's side cooling fan. Recheck cooling fan operation. If resistance is 5 ohms or more, repair open in LOW FAN GND circuit between passenger's side cooling fan and HFC relay No. 2. Recheck cooling fan operation.
  68. 113) Measure Resistance Of LOW FAN PWR Circuit Ensure ignition switch is turned to OFF position. Disconnect LFC relay. Using a DVOM, measure resistance of LOW FAN PWR circuit between passenger's side cooling fan and LFC relay harness connectors. If resistance is less than 5 ohms, replace LFC relay. Recheck cooling fan operation. If resistance is 5 ohms or more, repair open in LOW FAN PWR circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 113) to step 115). No test procedures have been omitted.
  69. 115) Check Cooling Fans For Proper Operation If driver's side cooling fan did not operate in step 85), go to next step. If passenger side cooling fan did not operate in step 85), go to step 118).
  70. 116) Check B+ & Ignition START/RUN Circuits To HFC Relay No. 1 Turn ignition switch to OFF position. Disconnect HFC relay No. 1 (MAIN FAN in battery junction box). Using a DVOM, measure B+ circuit voltage between negative battery cable and HFC relay harness connector. (Scheme 7) Also, measure IGN START/RUN circuit voltage between negative battery cable and HFC relay No. 1 harness connector. If both voltage measurements are more than 10.5 volts, turn ignition switch to OFF position and replace HFC relay No. 1. If voltage is 10.5 volts or less, turn ignition switch to OFF position and check appropriate B+ or IGN START/RUN circuit fuse. If fuse(s) is okay, check for open in appropriate circuit. Repair as necessary. If fuse(s) is blown, check B+ and HIGH FAN PWR circuits for short to ground before replacing fuse(s). Repair as necessary. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 116) to step 118). No test procedures have been omitted.
  71. 118) Check Ignition START/RUN & GND Circuits To HFC Relay No. 2 Turn ignition switch to OFF position. Disconnect HFC relay No. 2 (ADD FAN 2 in battery junction box). Turn ignition switch to ON position, engine off. Using a DVOM, measure voltage HFC relay No. 2 harness connector IGN START/RUN circuit and GND circuit terminals. (Scheme 7) If voltage is more than 10.5 volts, turn ignition switch to OFF position and go to step 121). If voltage is 10.5 volts or less, go to next step.
  72. 119) Check Ignition START/RUN Voltage To HFC Relay No. 2 Using a DVOM, measure voltage between chassis ground and HFC relay harness connector IGN START/RUN circuit terminal. If voltage is more than 10.5 volts, turn ignition switch to OFF position and repair open GND circuit to HFC relay No. 2. If voltage is 10.5 volts or less, turn ignition switch to OFF position and repair open in IGN START/RUN circuit to HFC relay No. 2. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 119) to step 121). No test procedures have been omitted.
  73. 121) Check LOW FAN GND Circuit Between Passenger Fan & HFC Relay No. 2 Ensure ignition switch is turned to OFF position. Disconnect passenger side cooling fan. Using a DVOM, measure resistance of LOW FAN GND circuit between HFC relay No. 2 and passenger side cooling fan harness connectors. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in LOW FAN GND circuit between HFC relay No. 2 and splice to passenger side cooling fan. Recheck cooling fan operation.
  74. 122) Measure Resistance Of HFC Circuit Between HFC Relays No. 1 & 2 Ensure ignition switch is turned to OFF position. Disconnect HFC relay No. 1 (MAIN FAN in battery junction box). Using a DVOM, measure resistance of HFC circuit between HFC relays No. 1 and 2 harness connectors. If resistance is less than 5 ohms, repalce HFC relay No. 2. Recheck cooling fan operation. If resistance is 5 ohms or more, repair open in HFC circuit between HFC relays No. 1 and 2. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 122) to step 124). No test procedures have been omitted.
  75. 124) Check Operation Of Both Fans With HFC Relay No. 2 Disconnected & Low Fan Commanded ON Ensure ignition switch is turned to OFF position. Disconnect HFC relay No. 2. Turn ignition switch to ON position, engine off. Using scan tool, access OUTPUT TEST MODE. Command low speed fan ON. If both fans now operate, replace HFC relay No. 2 (contacts are stuck closed). Recheck cooling fan operation. If only one cooling fan operates, no fault is indicated, problem may be intermittent. Repeat step 85). If results are the same, return to SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE article. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 124) to step 130). No test procedures have been omitted.
  76. 130) By-Pass Fan Braking Relay & Check Cooling Fan Operation Turn ignition switch to OFF position. Reconnect cooling fans. Disconnect cooling fan braking relay (in relay center box No. 1, front left side of engine compartment). Connect a jumper wire between cooling fan braking relay harness connector terminals No. 87 (GND circuit) and 30 (ground circuit to cooling fans). (Scheme 10) Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. Command high speed fan ON. If cooling fan does not operate properly, go to next step. If cooling fan now operates properly, go to step 135).
  77. 131) Check GND Circuit From Cooling Fan Braking Relay Turn ignition switch to OFF position. Disconnect scan tool from DLC. Using a DVOM, measure resistance of GND circuit between chassis ground and cooling fan braking relay harness connector terminal No. 87. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in GND circuit. Recheck cooling fan operation.
  78. 132) Measure Resistance Of Cooling Fan GND Circuit Between Cooling Fan & Cooling Fan Braking Relay Using a DVOM, measure resistance of cooling fan ground circuit between appropriate cooling fan harness connector and cooling fan braking relay harness connector terminal No. 30. If resistance is less than 5 ohms, replace appropriate cooling fan. If resistance is 5 ohms or more, repair open in cooling fan ground circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 132) to step 135). No test procedures have been omitted.
  79. 135) Check VPWR Voltage To Cooling Fan Braking Relay Ensure ignition switch is turned to ON position, engine off. Using scan tool, measure VPWR voltage between negative battery terminal and cooling fan braking relay harness connector VPWR terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit. Recheck cooling fan operation.
  80. 136) Measure Resistance Of LFC Circuit To Cooling Fan Braking Relay Turn ignition switch to OFF position. Disconnect LFC relay. Using a DVOM, measure resistance of LFC circuit between LFC relay and cooling fan braking relay harness connectors. If resistance is less than 5 ohms, replace cooling fan braking relay. Recheck cooling fan operation. If resistance is 5 ohms or more, repair open in LFC circuit. Recheck cooling fan operation.

TEST X: CONSTANT CONTROL RELAY MODULE (CCRM)

Note. This article only tests the Fan Control (FC) relay and Constant Relay Control Module (CCRM) circuits. Other test may be referenced while performing electric cooling fan diagnosis. For complete Ford EEC-V system diagnosis, see SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE.

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

CCRM interfaces with the EEC-V system to provide control for cooling fan and A/C clutch. CCRM also contains EEC-V power relay, which provides battery power (VPWR) to the Powertrain Control Module (PCM) and EEC-V system. Perform this test only when instructed by QUICK TEST or if directed by a system test. This test is only intended to diagnose the following

  1. Constant Control Relay Module (CCRM)
  2. Harness Circuits (B+, VPWR, FC, LOW FAN PWR, HIGH FAN PWR, GND, LFC, HFC, ACCS, A/C CLUTCH PWR & WAC). (Scheme 12)- (Scheme 14)
  3. Powertrain Control Module (PCM)

To prevent replacing good components, be aware the following non-EEC related components or systems may be at fault

  1. A/C System
  2. Fuel System
  3. Starting & Charging System

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17

Scheme 18

Scheme 18
Scheme 18
  1. 1) Check VPWR Circuit Continuity Turn ignition switch to OFF position. Disconnect IAC valve connector. Disconnect CCRM connector. See «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Disconnect scan tool from Data Link Connector (DLC). Using a DVOM, measure resistance between VPWR terminal at IAC harness connector and terminals No. 12 and 24 at CCRM harness connector. (Scheme 15) If both resistance measurements are less than 5 ohms, reconnect IAC and go to next step. If any resistance measurement is 5 ohms or more, repair open in VPWR circuit between CCRM and splice to IAC valve. CCRM LOCATIONS Application Location Escort In Left Front Of Engine Compartment Mustang Mounted On Bracket, Behind Engine Coolant Reservoir
  2. 2) Check For Battery Voltage & IGN START/RUN Voltage To CCRM Using a DVOM, measure voltage between negative battery terminal and terminals No. 8 and 10 at CCRM harness connector. Note voltage. Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and terminal No. 13 at CCRM harness connector. If all voltage measurements are more than 10.5 volts, go to next step. If any voltage measurement is 10.5 volts or less, check related fuses. If fuse is blown, check for short to ground in B+ or IGN START/RUN circuits. Repair as necessary and replace fuse. If fuses are okay, repair open in B+ or IGN START/RUN circuit.
  3. 3) Check CCRM Ground Circuit Turn ignition switch to OFF position. Leave CCRM disconnected. Using a DVOM, measure voltage between terminals No. 8 and 15 at CCRM harness connector. If voltage is more than 10.5 volts, replace CCRM. If voltage is 10.5 volts or less, repair open in ground circuit (terminal No. 15). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 15). No test procedures have been omitted.
  4. 15) KOEO & KOER DTC P1479: Check High Fan Control (HFC) Relay DTC P1479 indicates HFC primary circuit failure. Following are possible causes for this fault. Open Or Shorted Circuit Faulty CCRM Faulty Powertrain Control Module (PCM) Turn ignition switch to OFF position. Disconnect CCRM connector. See «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Using a DVOM, measure resistance between terminals No. 17 and 24 at CCRM harness connector. (Scheme 15) Resistance should be 65-100 ohms. Using a DVOM, measure resistance between terminal No. 17 and terminals No. 1 through 11, 13, 15 and 21 at CCRM harness connector. Each resistance should be more than 1000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace CCRM.
  5. 16) Check HFC Circuit Continuity Turn ignition switch to OFF position. Disconnect CCRM and PCM harness connectors. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between PCM harness connector terminal No. 17 (Escort) or No. 46 (Mustang) and terminal No. 17 at CCRM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in HFC circuit.
  6. 17) Check HFC Circuit For Short To Power Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and PCM harness connector terminal No. 17 (Escort) or No. 46 (Mustang). If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in HFC circuit.
  7. 18) Check HFC Circuit For Short To Ground Turn ignition switch to OFF position. Disconnect scan tool from Data Link Connector (DLC). Using a DVOM, measure resistance between PCM harness connector terminal No. 17 (Escort) or No. 46 (Mustang) and negative battery. If resistance is 10 k/ohms or less, repair HFC circuit short to ground. If resistance is more than 10 k/ohms, connect scan tool to DLC. Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan ON and wait 10 seconds. Command high speed fan OFF. If high speed fan turns on and off as expected, disregard DTC P1479. Repeat «QUICK TEST»(ref-97420-S04271227602001050700000) and service any DTCs as necessary. If high speed fan does not turn on and off as expected, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.
  8. 20) KOEO & KOER DTC P1474: Check Fan Operation This DTC indicates primary circuit failure in Low Fan Control (LFC) circuit or Fan Control (FC) circuit for single cooling fan systems. Following are possible causes for this fault. Open Or Shorted Circuit Faulty CCRM Faulty Powertrain Control Module (PCM) Turn ignition switch to ON position. If cooling fan runs continuously, go to step 24). If cooling fan does not run continuously, go to next step.
  9. 21) Check FC/LFC Circuit For Short To Ground Turn ignition switch to OFF position. Disconnect CCRM connector. Disconnect scan tool from Data Link Connector (DLC). Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between terminal No. 14 at CCRM and negative battery terminal. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in FC or LFC circuit.
  10. 22) Check Fan Operation Connect CCRM connector. Leave PCM disconnected. Turn ignition switch to ON position. If cooling fan runs continuously, replace PCM. If cooling fan does not run continuously, replace CCRM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 24). No test procedures have been omitted.
  11. 24) Check FC/LFC Circuit Continuity Disconnect CCRM connector. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between PCM harness connector terminal No. 45 (except Mustang 4.6L) or No. 19 (Mustang 4.6L) and terminal No. 14 at CCRM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FC or LFC circuit.
  12. 25) Check FC/LFC Circuit For Short To Power Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and terminal No. 14 at CCRM. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in FC or LFC circuit.
  13. 26) FC/LFC Circuit Fault Isolation Check Turn ignition switch to OFF position. Reconnect CCRM connector. Connect a jumper wire between PCM harness connector terminal No. 45 (except Mustang 4.6L) or No. 19 (Mustang 4.6L) and negative battery terminal. If cooling fan continues to run, replace CCRM. If cooling fan does not run continuously, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 26) to step 30). No test procedures have been omitted.
  14. 30) Continuous Memory DTC P1474: Check FC/LFC Circuit For Open Circuit Or Short To Power This DTC indicates a circuit failure has occurred on Fan Control (FC) circuit (Mustang 3.8L) or Low Fan Control (LFC) circuit (Escort and Mustang 4.6L). Turn ignition switch to OFF position. Disconnect cooling fan connector. Connect a test light between negative battery terminal and LOW FAN PWR (FAN PWR on Mustang 3.8L) terminal at cooling fan harness connector. (Scheme 12)- (Scheme 14). Turn ignition switch to ON position. Test light should be off. Check for indication of fault (test light blinks or turns on) while performing the following: Shake and bend FC/LFC circuit between CCRM and PCM. Lightly tap CCRM to simulate road shock. If fault is indicated, isolate fault and repair as necessary. If fault is not indicated, go to next step.
  15. 31) Check LFC/FC Circuit For Short To Ground Leave cooling fan connector disconnected and test light connected. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command low speed fan ON. Test light should be on. Check for indication of fault (test light blinks or turns off) while performing the following: Shake and bend FC/LFC circuit between CCRM and PCM. Lightly tap CCRM to simulate road shock. If fault is indicated, isolate fault and repair as necessary. If fault is not indicated, problem is intermittent and cannot be duplicated at this time. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 35). No test procedures have been omitted.
  16. 35) Continuous Memory DTC P1479 This DTC indicates that High Fan Control (HFC) circuit failure has occurred. Turn ignition switch to OFF position. Disconnect cooling fan connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between negative battery terminal and high fan power circuit terminal at cooling fan harness connector. (Scheme 12)or (Scheme 14). Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan ON. Test light should be on. Check for indication of fault (test light blinks or turns off) while performing the following: Shake and bend HFC circuit between CCRM and PCM. Lightly tap CCRM to simulate road shock. If fault is indicated, isolate fault and repair as necessary. If fault is not indicated, go to next step.
  17. 36) Check HFC Circuit For Short To Ground Turn ignition switch to ON position. Command high speed fan OFF. Test light should be off. Check for indication of fault (test light blinks or turns on) while performing the following: Shake and bend HFC circuit between CCRM and PCM. Lightly tap CCRM to simulate road shock. If fault is indicated, isolate fault and repair as necessary. If fault is not indicated, problem is intermittent and cannot be duplicated or identified at this time. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 36) to step 40). No test procedures have been omitted.
  18. 40) Check Cooling Fan Operation Turn ignition switch to OFF position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command cooling fan ON. Check fan operation. On 2-speed fan applications, check both fan speeds (wait 30 seconds after commanding high speed fan on). If fan does not operate, go to next step. If fan operates (all speeds), no problem is indicated at this time. Fault may be intermittent.
  19. 41) Cooling Fan Concern On Mustang 3.8L, go to next step. On all other models, during operational check of both fan speeds, if fan did not operate at any speed, stay in OUTPUT TEST MODE and go to next step. If fan operated at one fan speed, go to step 50).
  20. 42) Cooling Fan Does Not Operate At Any Speed Turn ignition switch to ON position. Disconnect cooling fan. Command fan ON (high speed for 2-speed applications). Using a DVOM, measure voltage between negative battery terminal and HIGH FAN PWR (FAN PWR on Mustang 3.8L) terminal at cooling fan harness connector. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step 45).
  21. 43) Check B+ Circuit To Fan Relays Turn ignition switch to OFF position. Ensure cooling fan is disconnected. Disconnect CCRM connector. Using a DVOM, measure voltage between negative battery terminal and terminals No. 3 and 4 at CCRM harness connector. If both voltage measurements are more than 10 volts, go to next step. If any voltage measurement is 10 volts or less, fault exists in B+ circuit. Check cooling fan related fuse/fuse links. If fuse/fuse link is blown, check for short to ground in B+ circuit. Repair as necessary. If fuse/fuse link is okay, check for open B+ circuit. Repair as necessary, reconnect all components and recheck system operation.
  22. 44) Check Power To Fan(s) Circuit Turn ignition switch to OFF position. Disconnect CCRM connector. See «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Ensure cooling fan is disconnected. Perform appropriate procedure: Mustang 3.8L Using a DVOM, measure resistance of FAN PWR circuit between cooling fan harness connector and terminal No. 2 at CCRM harness connector. If resistance is less than 7 ohms, go to step 70). If resistance is 7 ohms or more, locate and repair open circuit between cooling fan and CCRM. After repair is complete, reconnect all components and recheck system operation. All Models Except Mustang 3.8L Using a DVOM, measure resistance of HIGH FAN PWR circuit between cooling fan harness connector and terminal No. 6 at CCRM harness connector. Using a DVOM, measure resistance of LOW FAN PWR circuit between cooling fan harness connector and terminal No. 2 of CCRM. If both resistance measurements are less than 7 ohms, replace CCRM. If any resistance measurement is 7 ohms or more, locate and repair open circuit(s) between cooling fan and CCRM. After repair is complete, reconnect all components and recheck system operation.
  23. 45) Check Cooling Fan Ground Circuit Disconnect scan tool from Data Link Connector (DLC). Using a DVOM, measure resistance between negative battery terminal and ground circuit terminal at cooling fan harness connector. If resistance is 5 ohms or more, locate and repair open ground circuit. Reconnect all components and recheck system operation. If resistance is less than 5 ohms, replace cooling fan. Reconnect all components and recheck system operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 45) to step 50). No test procedures have been omitted.
  24. 50) Determine Which Fan Speed Is Operational If low speed fan is functioning properly, but high speed fan is inoperative, go to step 65). If low speed fan is not functioning properly, go to next step.
  25. 51) Low Speed Cooling Fan Inoperative Turn ignition switch to ON position. Remain in OUTPUT TEST MODE. Disconnect cooling fan. Command low speed fan ON. Using a DVOM, measure voltage between negative battery terminal and LOW FAN PWR terminal at cooling fan harness connector. If voltage is more than 10 volts, replace cooling fan. Reconnect all components and recheck system operation. If voltage is 10 volts or less, go to next step.
  26. 52) Check Low Fan Power Circuit Continuity Turn ignition switch to OFF position. Disconnect CCRM connector. Using a DVOM, measure resistance between LOW FAN PWR terminal at cooling fan harness connector and terminals No. 1 and 2 at CCRM harness connector. (Scheme 15) If both resistance measurements are less than 5 ohms, go to step 70). If any resistance measurement is 5 ohms or more, locate and repair open in LOW FAN PWR power circuit. Reconnect all components and recheck system operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 65). No test procedures have been omitted.
  27. 65) High Speed Cooling Fan Inoperative With scan tool still in OUTPUT TEST MODE, disconnect cooling fan. Turn ignition switch to ON position. Command high speed cooling fan ON. Using a DVOM, measure voltage between negative battery terminal and HIGH FAN PWR terminal at cooling fan harness connector. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, replace cooling fan. Reconnect all components and recheck system operation.
  28. 66) Check High Fan Power Circuit Resistance Turn ignition switch to OFF position. Disconnect CCRM connector. Using a DVOM, measure resistance of HIGH FAN PWR circuit between terminal No. 6 at CCRM harness connector and cooling fan harness connector. If resistance is less than 5 ohms, go to step 70). If resistance is 5 ohms or more, locate and repair open in HIGH FAN PWR circuit. Reconnect all components and recheck system operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 70). No test procedures have been omitted.
  29. 70) Accessing Parameter Identification (PID) A inoperative high speed or low speed fan can be caused by a primary circuit fault, even though a DTC was not set. Check if scan tool being used is capable of accessing PID values while in OUTPUT TEST MODE. If PID access is possible, go to next step. If PID access is not possible, go to step 73) (if fan inoperative on Mustang 3.8L or if low speed fan inoperative on all other models) or step 16) (if high speed fan inoperative).
  30. 71) Check Operation Of Primary Fan Circuits Reconnect all connectors. Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Perform the appropriate test procedure as follows: Low Speed Fan Inoperative (Fan Inoperative On Mustang 3.8L) Using scan tool, select LFCA and LFCF PIDs from PID/DATA MONITOR & RECORD menu. With low speed fan off, LFCA PID should indicate OFF and LFCF PID should indicate NO. Command low speed fan ON. LFCA PID should indicate ON and LFCF PID should still indicate NO. High Speed Fan Inoperative Using scan tool, select HFCA and HFCF PIDs from PID/DATA MONITOR & RECORD menu. Command high speed fan ON. HFCA PID should indicate OFF and LFCF PID should indicate NO. Command high speed fan ON. HFCA PID should indicate ON and HFCF PID should still indicate NO. On all models, if LFCF PID of HFCF PID indicated YES with fan commanded on or off, a primary circuit fault is detected. Go to step 15) (if HFCF PID was yes) or go to step 20) (if LFCF PID was yes). If LFCF PID of HFCF PID indicated NO with fan commanded on or off, primary circuits are okay. Replace CCRM. Verify applicable FAN PWR circuit is not shorted to ground. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 71) to step 73). No test procedures have been omitted.
  31. 73) Check FC Or LFC Circuit For Short To Ground Turn ignition switch to OFF position. Disconnect scan tool from DLC. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between terminal No. 14 at CCRM and negative battery terminal. If resistance is more than 10 k/ohms, replace CCRM. Ensure appropriate FAN PWR circuit is not shorted to ground. If resistance is 10 k/ohms or less, repair short to ground in LFC or LF circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 73) to step 80). No test procedures have been omitted.
  32. 80) Cooling Fan Always Runs, No DTCs Present Start engine. Using scan tool, select ACP PID from PID/DATA MONITOR & RECORD menu. If PID value indicates CLOSED, leave engine running and go to next step. If PID value indicates OPEN, go to step 82).
  33. 81) Check A/C High Pressure Switch Disconnect A/C high pressure switch. Again, view ACP PID. If PID value indicates CLOSED, turn ignition switch to OFF position. Go to step 135) and check A/C high pressure input to PCM. If PID value indicates OPEN, turn ignition switch to OFF position. Reconnect A/C high pressure switch. Check A/C high pressure switch operation and check for overcharged A/C system. See appropriate article in AIR CONDITIONING & HEATING.
  34. 82) Cooling Fan Always Runs Turn all accessories off. Turn ignition switch to ON position. Verify that cooling fan is always on. Turn ignition switch to OFF position. See «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Disconnect CCRM connector. Turn ignition switch to ON position. If cooling fan is off, go to step 84). If cooling fan is still on, locate and repair short to power in power to fan circuit (Mustang 3.8L) or go to next step (all other models).
  35. 83) Check For Short To Power Disconnect cooling fan. Using a DVOM, measure voltage between negative battery terminal and LOW FAN PWR and HIGH FAN PWR terminals at cooling fan harness connector. If both voltage measurements are less than one volt, problem is intermittent and cannot be duplicated at this time. If any voltage measurement is one volt or more, locate and repair short to power in applicable FAN PWR circuit. Reconnect all components and recheck system operation.
  36. 84) Check Operation Of Primary Fan Circuits Reconnect all connectors. Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Perform the appropriate test procedure as follows: Low Speed Fan Stops Running (Fan Stops Running On Mustang 3.8L) With CCRM Disconnected Using scan tool, select LFCA and LFCF PIDs from PID/DATA MONITOR & RECORD menu. Command low speed OFF. LFCA PID should indicate OFF and LFCF PID should indicate NO. Fan Stops Running With CCRM Disconnected Using scan tool, select HFCA and HFCF PIDs from PID/DATA MONITOR & RECORD menu. Command high speed fan OFF. HFCA PID should indicate OFF and HFCF PID should indicate NO. If LFCF PID of HFCF PID indicated YES with fan commanded off, a primary circuit fault is detected. Go to step 15) (if HFCF PID was yes) or go to step 20) (if LFCF PID was yes). If LFCF PID of HFCF PID indicated NO with fan commanded off, primary circuits are okay. Replace CCRM. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 84) to step 98). No test procedures have been omitted.
  37. 98) Lack Of Cooling: A/C Not Functioning Turn ignition switch to OFF position. Disconnect A/C cycling switch. Connect a jumper wire between A/C cycling switch harness connector terminals. Disconnect A/C clutch. Connect a DVOM between power and ground terminals at A/C clutch harness connector. Start engine. Turn A/C on and wait 15 seconds. If voltage is not more than 10.5 volts, go to next step. If voltage is more than 10.5 volts, turn ignition switch to OFF position. Remove jumper wire. Reconnect all connectors. If symptom is poor A/C performance in hot ambient temperature on all except Mustang 3.8L, go to step 145). On all others, check and repair A/C system as necessary.
  38. 99) Check ACCS PID Value Ensure jumper wire is still connected between A/C cycling switch harness connector terminals and A/C is on. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. If PID value indicates ON, turn ignition switch to OFF position. Remove jumper wire. Reconnect A/C cycling switch, and go to step 110). If PID value indicates OFF, PCM is not receiving ACCS signal. Go to next step.
  39. 100) Check For Voltage To A/C Cycling Pressure Switch Disconnect A/C cycling switch. Turn ignition switch to ON position. Turn A/C switch on. Using a DVOM, measure voltage between A/C demand switch side of A/C cycling switch harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, EEC-V system is okay. Fault is in A/C system. Check A/C system of cause of voltage loss to A/C cycling switch.
  40. 101) Check A/C Cycling Switch Contacts Turn ignition switch to OFF position. Using a DVOM, measure resistance between A/C cycling switch terminals. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, EEC-V system is okay. Fault is in A/C system. Check A/C cycling switch and for proper refrigerant charge. Repair as necessary.
  41. 102) Check For Voltage To A/C High Pressure Switch (ACPSW) Turn ignition switch to OFF position. Reconnect A/C cycling switch. Disconnect ACPSW. Turn ignition switch to ON position. Turn A/C switch on. Using a DVOM, measure voltage between A/C demand switch terminal at ACPSW harness connector and negative battery terminal. (Scheme 16) If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit between ACPSW and A/C cycling switch.
  42. 103) Measure Resistance Of ACPSW High Pressure Contacts Turn ignition switch to OFF position. Using a DVOM, measure resistance between ACPSW high pressure terminals. (Scheme 17) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, check for overcharged A/C system. Service A/C system as necessary. If system charge is okay, replace ACPSW.
  43. 104) Check Voltage To PCM On ACCS Circuit Turn ignition switch to OFF position. Reconnect ACPSW. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Turn A/C switch on. Using a DVOM, measure voltage between PCM harness connector terminal No. 41 and negative battery terminal. If voltage is more than 10.5 volts, replace PCM. If voltage is 10.5 volts or less, repair open circuit between PCM and ACPSW.
  44. 105) KOEO/KOER DTC P1460: Check ACCS PID This DTC indicates that a fault occurred in Wide Open Throttle A/C Cut-Out (WAC) circuit. Following are possible causes for this fault: A/C On During Self-Test Open Or Shorted Circuit Faulty CCRM Faulty Powertrain Control Module (PCM) Turn A/C and defroster off. Start engine and allow to idle. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. If PID value indicates OFF, go to next step. If PID value indicates ON, go to step 125).
  45. 106) Check WAC Circuit & WOT A/C Cutoff Relay In CCRM Turn ignition switch to OFF position. Disconnect CCRM connector. See «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Using a DVOM, measure resistance between terminal No. 22 and 24 at CCRM harness connector. (Scheme 15) Resistance should be 130-200 ohms. Using a DVOM, measure resistance between terminal No. 22 and terminals No. 1 through 11, 13, 15 and 21 at CCRM harness connector. Each resistance should be more than 1000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace CCRM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000).
  46. 107) WAC Circuit For Short To Power Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Using a DVOM, measure voltage between terminal No. 22 at CCRM and negative battery terminal. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair WAC circuit short to power. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000).
  47. 108) Check WAC Circuit For Short To Ground Turn ignition switch to OFF position. Leave CCRM and PCM disconnected. Disconnect scan tool from Data Link Connector (DLC). Using a DVOM, measure resistance between terminal No. 22 at CCRM harness connector and negative battery terminal. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair WAC circuit short to ground. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000).
  48. 109) Check WAC Circuit Resistance Turn ignition switch to OFF position. Using a DVOM, measure resistance between PCM harness connector terminal No. 69 (WAC) and terminal No. 22 at CCRM harness connector. If resistance is less than 5 ohms, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000). If resistance 5 ohms or more, repair open in WAC circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat QUICK TEST.
  49. 110) Check A/C Voltage To CCRM Turn ignition switch to OFF position. Disconnect CCRM connector. Turn A/C demand switch on. Using a DVOM, measure voltage between terminal No. 21 at CCRM harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in A/C demand circuit between CCRM and ACCS circuit splice to PCM.
  50. 111) Check Circuit Continuity Turn ignition switch to OFF position. Disconnect scan tool from Data Link Connector (DLC). Disconnect A/C clutch connector. Using a DVOM, measure resistance of A/C clutch ground circuit between terminal No. 16 at CCRM harness connector and A/C clutch harness connector. Using a DVOM, measure resistance of A/C clutch PWR circuit between terminal No. 23 at CCRM harness connector and A/C clutch harness connector. If any resistance measurement is 5 ohms or more, repair open circuit. If both resistance measurements are less than 5 ohms, replace CCRM. Verify A/C clutch PWR circuit is not shorted to ground. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 111) to step 115). No test procedures have been omitted.
  51. 115) Continuous Memory DTC P1469: Excessive A/C Compressor Clutch Cycling This DTC indicates ACCS input to PCM has changed states in less than 8.5 second intervals. Possible causes are: A/C system mechanical fault such as low refrigerant charge or damaged A/C cycling switch. Intermittent open circuit between A/C cycling pressure switch and PCM terminal No. 41 (ACCS). Check A/C system for mechanical fault such as low refrigerant charge or damaged A/C cycling switch. See appropriate article in AIR CONDITIONING & HEATING. If fault is indicated, isolate fault and repair as necessary. Clear DTCs. Start engine and turn A/C on for about 2 minutes. Turn engine and A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000). If fault is not indicated, go to next step.
  52. 116) Check Circuit Between A/C Cycling Switch & PCM Turn ignition switch to OFF position. Turn ignition switch to ON position. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. Turn A/C switch on. Check for indication of fault while performing the following: Shake and bend ACCS circuit between A/C cycling switch and PCM. Lightly tap A/C cycling switch to simulate road shock. Fault will be indicated by ACCS PID quickly turning on and off. If fault is indicated, isolate and repair as necessary. Clear DTCs. Start engine and turn A/C on for about 2 minutes. Turn engine and A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000). If fault is not indicated, problem is intermittent and cannot be duplicated at this time. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 116) to step 120). No test procedures have been omitted.
  53. 120) Continuous Memory DTC P1460: Intermittent WAC Circuit Failure Turn ignition switch to OFF position. Disconnect A/C cycling switch. Connect a jumper wire between A/C cycling switch harness connector terminals. Turn ignition switch to ON position. On Mustang, turn A/C demand switch on. On Escort, using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Command outputs ON (this will engage A/C clutch). On all models, check for indication of fault while performing the following: Shake and WAC circuit between CCRM and PCM. Lightly tap on CCRM to simulate road shock. An open circuit or short to power is indicated by A/C clutch clicking on (Mustang) or by A/C clutch clicking off (Escort). On Escort, using scan tool, turn outputs OFF. On all models, check for indication of fault while performing the following: Shake and WAC circuit between CCRM and PCM. Lightly tap on CCRM to simulate road shock. A short to ground is indicated by A/C clutch clicking off (Mustang) or by A/C clutch clicking on (Escort). If a fault is located, isolate fault and repair as necessary. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-97420-S04271227602001050700000). If fault is not located, fault is intermittent. Remove jumper wire and go to TEST Z, step 1) in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE and check for intermittent faults.
  54. 124) DTC P1464: Check ACCS PID This DTC indicates ACCS input to PCM was high during self-test. Turn ignition switch to OFF position. Connect scan tool to DLC. Turn ignition switch to ON position. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. If PID value indicates ON, go to next step. If PID value indicates OFF, indication is A/C and defrost switch were on during self-test. Turn A/C and defrost switch off. Repeat «KOEO ON-DEMAND SELF-TEST»(ref-97420-S05083176622001050700000) or «KOER ON-DEMAND SELF-TEST»(ref-97420-S18413912892001050700000) where DTC P1464 was received.
  55. 125) ACCS PID On Turn ignition switch to OFF position. Disconnect A/C cycling switch. Turn ignition switch to ON position. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. If PID value indicates ON, go to step 127) (Escort) or next step (Mustang). If PID value indicates OFF, check A/C switch and replace switch as necessary. See appropriate article in AIR CONDITIONING & HEATING. If A/C switch is okay, repair short to power in A/C demand circuit to A/C cycling switch.
  56. 126) Check A/C Clutch Circuit For Short To Power Turn ignition switch to OFF position. Disconnect CCRM connector. «CCRM LOCATIONS»(ref-97420-S18395930182001011100000) table. Turn ignition switch to ON position. Using a DVOM, measure voltage between terminal No. 23 at CCRM harness connector and negative battery terminal. (Scheme 15) If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power.
  57. 127) Check ACCS Circuit For Short To Power Turn ignition switch to OFF position. On Escort, reconnect CCRM and A/C cycling switch. On all models, Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Using a DVOM, measure voltage at PCM harness connector terminal No. 41 and negative battery terminal. If voltage is less than one volt, replace PCM (Escort) or go to next step (Mustang). If voltage is one volt or more, repair short to power in ACCS circuit.
  58. 128) Check ACCS Circuit Voltage To PCM Turn ignition switch to OFF position. Leave A/C cycling switch and PCM disconnected. Reconnect CCRM. Turn ignition switch to ON position. Using a DVOM, measure voltage between PCM harness connector terminal No. 41 and ground. If voltage is less than one volt, replace PCM. If voltage is one volt or more, replace CCRM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 128) to step 130). No test procedures have been omitted.
  59. 130) Check If A/C Turns Off When A/C Switch Is Turned Off Turn A/C demand switch off. If A/C turns off, go to next step. If A/C does not turn off, go to step 140).
  60. 131) Check If A/C Cuts Off During WOT Start engine and allow to idle. Turn A/C on. Briefly snap throttle wide open and then return to idle. Listen for A/C clutch disengagement during WOT, then re-engagement after a few seconds of returning to idle. A click noise will be heard when A/C re-engages. Repeat test several times. If A/C clicking noise cannot be heard, disconnect A/C clutch. Connect a test light between A/C clutch power and ground terminals at A/C clutch harness connector. Again, briefly snap throttle to wide open position and return to idle. Test light should be off during WOT and on after a few seconds of returning to idle. If A/C clutch or test light operates as specified, WAC circuit is functioning properly at this time. Go to TEST Z, step 1) SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE and check for intermittents. If A/C clutch or test light does not operate as specified, go to next step.
  61. 132) No WOT A/C Cutoff, No DTCs: Check CCRM Reconnect A/C clutch (if necessary). Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-97420-S37444213662001050800000) under ADDITIONAL SYSTEM FUNCTIONS. Turn A/C DEMAND switch on. While observing A/C clutch engagement, command outputs on and off several times. If A/C clutch engagement cycles, system is functioning properly at this time. Go to TEST Z, step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE and check for intermittent faults. If A/C clutch does not cycle, replace CCRM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 132) to step 135). No test procedures have been omitted.
  62. 135) Check ACPSW Circuit For Short To Ground Turn ignition switch to OFF position. Disconnect A/C high pressure switch connector. Disconnect scan tool from Data Link Connector (DLC). Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between PCM harness connector terminal No. 86 and ground. If resistance is more than 10 k/ohms, replace PCM. If resistance is 10 k/ohms or less, repair short to ground in ACPSW circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 135) to step 140). No test procedures have been omitted.
  63. 140) A/C Always On: Check Voltage At A/C Clutch Turn ignition switch to OFF position. Turn A/C and defroster off. Disconnect A/C clutch. Connect a DVOM between A/C clutch harness connector terminals. Start engine. If voltage is 2 volts or more, go to next step. If voltage is less than 2 volts, electrical portion of A/C system is not at fault. If A/C related symptom still exists, see appropriate article in AIR CONDITIONING & HEATING.
  64. 141) Check ACCS Input To PCM Turn ignition switch to OFF position. Ensure A/C and defroster are off. Start engine. Using scan tool, select ACCS PID from PID/DATA MONITOR & RECORD menu. If PID value indicates ON, go to step 125). If PID value indicates OFF, check A/C system and repair as necessary. See appropriate article in AIR CONDITIONING & HEATING. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 141) to step 145). No test procedures have been omitted.
  65. 145) Check A/C High Pressure Switch Medium Pressure Circuits Turn ignition switch to OFF position. Disconnect A/C high pressure switch. Ensure A/C is off. Connect jumper wire between ACPSW terminal and ground terminal at A/C high pressure switch connector. (Scheme 18) Start engine and allow to idle for 15 seconds. If high speed fan does not come on, go to next step. If high speed fan comes on, turn ignition switch to OFF position. A/C high pressure switch medium pressure circuits are okay. Remove jumper wire and reconnect A/C high pressure switch connector. See appropriate article in AIR CONDITIONING & HEATING to diagnose symptom.
  66. Check Ground Circuit To A/C High Pressure Switch With engine still running, move jumper wire from ground terminal at A/C high pressure switch connector to negative battery post. Wait 15 seconds. If high speed fan comes on, turn ignition switch to OFF position. Repair open ground circuit to A/C high pressure switch. If high speed fan does not come on, remove jumper wire and go to next step.
  67. Check ACPSW Circuit To PCM Disconnect PCM connector(s). Using a DVOM, measure resistance between PCM harness connector terminal No. 86 and A/C high pressure switch connector ACPSW terminal. (Scheme 18) If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open circuit.

Electric Cooling Fan Wiring Diagram (Continental). Scheme 19

Scheme 19: Electric Cooling Fan Wiring Diagram (Continental)
Scheme 19: Electric Cooling Fan Wiring Diagram (Continental)

Electric Cooling Fan Wiring Diagram (Cougar). Scheme 20

Scheme 20: Electric Cooling Fan Wiring Diagram (Cougar)
Scheme 20: Electric Cooling Fan Wiring Diagram (Cougar)

Electric Cooling Fan Wiring Diagram (Crown Victoria & Grand Marquis). Scheme 21

Scheme 21: Electric Cooling Fan Wiring Diagram (Crown Victoria & Grand Marquis)
Scheme 21: Electric Cooling Fan Wiring Diagram (Crown Victoria & Grand Marquis)

Electric Cooling Fan Wiring Diagram (Escape - 2.0L). Scheme 22

Scheme 22: Electric Cooling Fan Wiring Diagram (Escape - 2.0L)
Scheme 22: Electric Cooling Fan Wiring Diagram (Escape - 2.0L)

Electric Cooling Fan Wiring Diagram (Escape - 3.0L). Scheme 23

Scheme 23: Electric Cooling Fan Wiring Diagram (Escape - 3.0L)
Scheme 23: Electric Cooling Fan Wiring Diagram (Escape - 3.0L)

Electric Cooling Fan Wiring Diagram (Escort & Escort ZX2). Scheme 24

Scheme 24: Electric Cooling Fan Wiring Diagram (Escort & Escort ZX2)
Scheme 24: Electric Cooling Fan Wiring Diagram (Escort & Escort ZX2)

Electric Cooling Fan Wiring Diagram (Focus With A/C). Scheme 25

Scheme 25: Electric Cooling Fan Wiring Diagram (Focus With A/C)
Scheme 25: Electric Cooling Fan Wiring Diagram (Focus With A/C)

Electric Cooling Fan Wiring Diagram (Focus Without A/C). Scheme 26

Scheme 26: Electric Cooling Fan Wiring Diagram (Focus Without A/C)
Scheme 26: Electric Cooling Fan Wiring Diagram (Focus Without A/C)

Electric Cooling Fan Wiring Diagram (LS). Scheme 27

Scheme 27: Electric Cooling Fan Wiring Diagram (LS)
Scheme 27: Electric Cooling Fan Wiring Diagram (LS)

Electric Cooling Fan Wiring Diagram (Mustang - 3.8L). Scheme 28

Scheme 28: Electric Cooling Fan Wiring Diagram (Mustang - 3.8L)
Scheme 28: Electric Cooling Fan Wiring Diagram (Mustang - 3.8L)

Electric Cooling Fan Wiring Diagram (Mustang - 4.6L). Scheme 29

Scheme 29: Electric Cooling Fan Wiring Diagram (Mustang - 4.6L)
Scheme 29: Electric Cooling Fan Wiring Diagram (Mustang - 4.6L)

Electric Cooling Fan Wiring Diagram (Ranger - 2.3L). Scheme 30

Scheme 30: Electric Cooling Fan Wiring Diagram (Ranger - 2.3L)
Scheme 30: Electric Cooling Fan Wiring Diagram (Ranger - 2.3L)

Electric Cooling Fan Wiring Diagram (Sable & Taurus). Scheme 31

Scheme 31: Electric Cooling Fan Wiring Diagram (Sable & Taurus)
Scheme 31: Electric Cooling Fan Wiring Diagram (Sable & Taurus)

Electric Cooling Fan Wiring Diagram (Town Car). Scheme 32

Scheme 32: Electric Cooling Fan Wiring Diagram (Town Car)
Scheme 32: Electric Cooling Fan Wiring Diagram (Town Car)

Electric Cooling Fan Wiring Diagram (Windstar). Scheme 33

Scheme 33: Electric Cooling Fan Wiring Diagram (Windstar)
Scheme 33: Electric Cooling Fan Wiring Diagram (Windstar)

More articles — Engine Cooling Fan