Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING SYSTEMDIAGNOSIS AND TESTINGENGINE COOLINGPINPOINT TESTSPINPOINT TEST E: THE COOLING FANS STAY ON ALL THE TIME

2005 Ford Taurus SEL, 4D Sedan

Pinpoint Test E: The Cooling Fans Stay On All The Time

2005 Ford Taurus SEL, 4D SedanSECTION Pinpoint Test E: The Cooling Fans Stay On All The Time

E1 CHECK THE A/C DUAL FUNCTION PRESSURE SWITCH INPUT TO THE PCM
- Key in START position.
- Verify the A/C is OFF.
- Monitor the A/C dual function pressure switch ACP PID.
- Does the A/C dual function pressure switch ACP PID read CLOSED?
- Yes : GO to E2.
- No : GO to E4.
E2 CHECK THE A/C HIGH PRESSURE SWITCH
- Disconnect: A/C Dual Function Pressure Switch C1062.
- Monitor A/C dual function pressure switch C1062 ACP PID.
- Does the A/C dual function pressure switch ACP PID read CLOSED?
- Yes : GO to E3.
- No : If the A/C system is working correctly, INSTALL a new A/C high pressure switch.
  If the A/C system is not working correctly, REFER to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION to diagnose the A/C system.
E3 CHECK CIRCUIT 347 (BK/YE) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: PCM C175.
- Measure the resistance between PCM C175 pin 86, circuit 347 (BK/YE) harness side and ground.
  
  Fig 1: Measuring Resistance Between PCM C175 Pin 86, Circuit 347 (BK/YE) Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new PCM. See INTRODUCTION - GASOLINE .
- No : REPAIR the circuit. TEST the system for normal operation.
E4 CHECK THE FAN BRAKING RELAY
- Disconnect: Fan Braking Relay.
- Did the cooling fans stop?
- Yes : INSTALL a new fan braking relay. TEST the system for normal operation.
- No : GO to E5.
E5 CHECK CIRCUIT 386 (LB) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: PCM C175.
- Measure the resistance between PCM C175 pin 28, circuit 386 (LB) harness side and ground.
  
  Fig 2: Measuring Resistance Between PCM C175 Pin 28, Circuit 386 (LB) Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to E6.
- No : REPAIR circuit 386 (LB). TEST the system for normal operation.
E6 CHECK CIRCUITS 3850 (LG/VT) AND 229 (RD/OG) FOR A SHORT TO POWER
- Disconnect: Resistor Relay.
- Did the cooling fans stop?
- Yes : REPAIR circuit 3850 (LG/VT). TEST the system for normal operation.
- No : REPAIR circuit 229 (RD/OG). TEST the system for normal operation.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.