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Cylinder head temp sensor symtom ford e250 - Cars & Trucks

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Posted on Jan 02, 2017

chuck943
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SOURCE: location of CHT sensor

It is located at the back of the passenger side cylinder head close to where the intake manifold and head meet.It will have a YE/LG and GY/RD wires to it.

Posted on May 24, 2009

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1 Answer

How do I change fan switch on 2005 E250 cargo van


Fan switch ? Radiator fans not working ? Your vehicle has a cylinder head temperature sensor . The sensor is a input to the PCM - engine computer , the PCM inturn will energize a relay turnning on the cooling fans when temp gets hot enough . Before replacing a sensor your vehicle may not need i suggest you have it diagnoised .

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Diagnostic code P1290 means what? I can not find it anywhere. Please help Thank you


P1290 Ford
P1290 Ford - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3 What does this mean?

http://engine-codes.com/p1290_ford.html

Forum Code

Possible causes

- Wrong thermostat

- Not at operating range

- Engine overheated

- Low engine coolant level

- Faulty Cylinder Head Temperature (CHT) sensor

- Cylinder Head Temperature (CHT) sensor harness is open or shorted

- Cylinder Head Temperature (CHT) sensor circuit poor electrical connection

What does this mean?

When is the code detected?

The Engine Control Module (ECM) detected the cylinder head temp below expected values

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1290 Ford Description

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (-258°F), the PCM disables four fuel injectors at a time. The PCM will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine. If the temperature exceeds 154 °C (310°F), the PCM disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).

Read more: http://engine-codes.com/p1290_ford.html#ixzz3iX7EnL32

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1 Answer

Location of CHT sensor


It is located at the back of the passenger side cylinder head close to where the intake manifold and head meet.It will have a YE/LG and GY/RD wires to it.

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