C0640 Citroen Auto Trouble Code
Parts or components should not be replaced with reference to only a C0640 Citroen DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
The problem is caused by the variable cylinder management system switching on and off during light throttle conditions, at cruising speeds, or when driving on flat roads. The constant switching causes excessive oil consumption and the trouble codes appear when oil pressure drops to the point where it can no longer operate the VCM system.
C0640 Citroen Possible Solution:
Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.
C0640 Citroen Description For All Models :
- Citroen 10 Hp
- Citroen 11
- Citroen 11 L
- Citroen 12
- Citroen 15
- Citroen 15cv
- Citroen 2cv
- Citroen 5cv
- Citroen 7 Hp
- Citroen 7a
- Citroen Activa
- Citroen Ak
- Citroen Ami
- Citroen Aventure
- Citroen Ax
- Citroen Axel
- Citroen B2
- Citroen Berlingo
- Citroen Berlingo Ii
- Citroen Berlingo Iii
- Citroen Big Fifteen
- Citroen Bijou
- Citroen Bx
- Citroen C
- Citroen C1
- Citroen C1 Ii
- Citroen C15
- Citroen C2
- Citroen C3
- Citroen C3 Aircross
- Citroen C3 Ii
- Citroen C3 Iii
- Citroen C3 Picasso
- Citroen C4
- Citroen C4 Aircross
- Citroen C4 Cactus
- Citroen C4 Ii
- Citroen C4 Picasso Ii
- Citroen C5
- Citroen C5 Ii
- Citroen C6
- Citroen C8
- Citroen C-crosser
- Citroen C-elysee
- Citroen Cx
- Citroen C-zero
- Citroen Ds
- Citroen Ds3
- Citroen Ds4
- Citroen Ds5
- Citroen Dyane
- Citroen Eco
- Citroen Eole
- Citroen Evasion
- Citroen G
- Citroen Gs
- Citroen Gsa
- Citroen Gsx
- Citroen Id
- Citroen Jumper
- Citroen Jumper Ii
- Citroen Jumpy
- Citroen Jumpy Iii
- Citroen Karin
- Citroen Light 15
- Citroen Ln
- Citroen Lna
- Citroen Mehari
- Citroen Mini-zup
- Citroen Multispace
- Citroen Nemo
- Citroen Osee
- Citroen Pluriel
- Citroen Rally Raid
- Citroen Saxo
- Citroen Six
- Citroen Sm
- Citroen Spacetourer
- Citroen Traction
- Citroen Tub
- Citroen Visa
- Citroen Xanae
- Citroen Xantia
- Citroen Xm
- Citroen Xsara
- Citroen Zx
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C0640 Citroen Trouble Repair :
If your vehicle failed a C0640 Citroen test and the C0640 Citroen Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature. |
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