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With a booking time of almost three-and-a-half hours and just a few special tools required, this repair is a profitable one for technicians. For this scheduled repair, the majority of the work is carried out from the top of the engine bay, so a vehicle lift is not essential.

With the engine at ambient temperature, open the bonnet and remove the air filter assembly Fig 1. This is achieved by disconnecting the two electrical multiplugs, unclipping the oil filler neck and jump start point, before detaching the two air intake pipes, lifting the front of the filter assembly up to withdraw it from the rubber grommets, and then sliding it forwards to remove from the rear mounting points.

Once removed, stow it in a safe area. This now allows greater access to the timing belt area. Now remove the viscous fan. If this proves too tight, unscrew the three bolts from the mounting bracket and stow the fan assembly carefully in the radiator cowling.

Before the auxiliary drive belt is removed, slacken the four spline bolts that retain the bottom pulley Fig 2. Once slackened, turn the auxiliary drive belt tensioner in a clockwise direction. With the tension released, remove the auxiliary drive belt and then the bottom pulley. At this point, check the auxiliary belt tensioner and overrunning alternator pulley for serviceable and correct operation, replacing if required.

Next, remove the timing belt covers, unclip the upper cover and discard, before disconnecting the five bolts from the lower cover.

Belt Replacement Guide: VW Crafter

Using a 19mm point socket on the crankshaft bolt, rotate the engine in a clockwise direction until the locking pin can be inserted into the camshaft pulley Fig 3. Ensure that the crankshaft pulley aligns and locks in with the special tool Fig 4. Finally, the pulley can now be locked for the high-pressure fuel pump Fig 5.

Slacken the three retaining bolts on the camshaft pulley, the three retaining bolts on the high-pressure fuel pump pulley and the timing belt tensioner nut. Once done, rotate the tensioner eccentric in an anticlockwise direction, which, with the tension removed, will allow for the timing belt to be removed from the engine.

These days, technicians need to bear in mind that the use of stretch bolts and onetime use, self-locking fixings are becoming more popular. The INA timing belt kit contains all the fixings needed for this repair. Starting at the top, replace the three bolts that retain the camshaft pulley, the top idler pulley and bolt, the high pressure fuel pump pulley bolts and, finally, the large deflection pulley.

With the latter pulley removed, there is now good access and visibility, which will help replace the coolant pump. Ensure the coolant pump location and timing belt areas are clean and dry before spreading a light smear of silicone-based grease on the new coolant pump seal.A Dodge Durango 4.

The driver says on cold mornings the heater will blow cold during the drive to work in rush hour traffic. Your first reaction might be to install a new thermostat and inspect the heater core for a blockage. On the test drive, the system may perform great for you. The issue could be the auxiliary water pump. This pump is not connected to the cooling of the engine. Its primary function is to circulate warm coolant to the heater core. If too little coolant is circulated, the blower fan will pull enough heat out of the coolant and cause the heater core to get cold.

Coupled with the lower engine speeds, the coolant in the heater core would lose most of its heat before it passed through to the outlet. This would cause drivers to complain about insufficient heating if they drove in stop-and-go traffic or cruised at speeds with lower RPMs.

So, adding an auxiliary coolant pump would provide enough coolant to keep the heater core warm. Mercedes then started to use these pumps on gasoline-powered vehicles like the C- and S-Class for the same purpose allowing vehicle engineers to use larger heater cores to provide better passenger comfort.

Mercedes, Audi and BMW have also used this pump as part of the automatic temperature control system to keep the cabin heated even after the driver has turned off the ignition. The system can keep the interior warm for short periods of time while the driver goes shopping or grabs a bite to eat.

These pumps will show up on more and more vehicles as engines become more efficient and generate less excess heat.

Cooling System Complications: Auxiliary Water Pumps

Note that the auxiliary pump is not running all the time. The BCM or controlling module will control and regulate the pump using information like:. A scan tool can test the pump function in most vehicles, but it is also possible to test the system by pressing an HVAC control head button sequence listed in the service information. The main reason why these pumps fail is age and wear of the electric motor.

Like all rotating electrical devices, brushes wear and windings short. Low coolant can also cause a pump to fail because of its position, which is typically high in the system, either on the firewall or strut tower.

P261A VOLKSWAGEN - Coolant Pump 'B' Control Circuit/Open

A failed pump will almost never cause the vehicle to overheat. If the auxiliary coolant pump is inoperative, the customer might notice reduced heater performance at low speeds and at idle. Your first instinct might be to replace the thermostat, the water pump or the heater core, but if the vehicle is equipped with an auxiliary coolant pump, you will need to dig a little bit deeper with your diagnostic process. The tools needed to diagnose an auxiliary coolant pump include: scan tool, meter and service information, with scan tools and service information being most important for late-model vehicles.

The operation of the pump is dependent on several modules and numerous sensors that are networked. The first step in the diagnostic process is to check for codes with a scan tool. Unrelated codes for collision detection, door module operation and loss of communications incidents can cause the deactivation of the pump. This is where service information can make the difference between a quick diagnostic process and parts swapping.

Newer vehicles may vary the voltage to control pump speed. Like all electrical devices on a vehicle, the operation is a balancing act between driver comfort and minimizing electrical loads on the alternator.

Fuses and relay Volkswagen Crafter

The cooling circuit on some vehicles with electric pumps may be called an auxiliary cooling circuit in the service information. The coolant may travel through the transmission cooler and windshield washer fluid bottle as part of the circuit on some Mercedes models.

Hybrids almost always have an electric water pump to cool the battery packs and inverters, and some hybrids will have a second pump for the heater core in the cabin. If a pump fails on some hybrids, the system will disable the hybrid drive system or put the vehicle into a limp mode.Fuse box in passenger compartment under driver's seat. Skip to content. Tags: Fuse box diagram Volkswagen. Trailer detection control unit Heated rear windscreen relay Or Trailer detection control unit Working speed control switch Power take-off warning switch Tachograph.

Air-conditioning control unit Or Gearbox hydraulic pump relay 40A also used. Interior light s relay Or Tipping mechanism relay Or Tailgate lift relay.

Trailer detection control unit Working speed control switch Power take-off warning switch Tachograph. Radiator fan control unit Cooling fan 60A also used 80A also used or not used. Power supply control unit Power supply relay Fuse and relay box No. Second battery Additional fuse in passenger compartment Or Second battery Additional fuse in passenger compartment Fuse and relay box No.

Terminal 15 voltage supply relay Horn relay Power supply control unit Fuse box No. Heated windscreen Fuse and relay box No.

Ignition lock Control unit with display in the dash panel insert Engine control unit. Fuse box No. Fuel pressure control solenoid Crankcase breather heater Mass airflow meter Reductant reversing valve Reductant pump Exhaust gas cooler solenoid Exhaust gas recirculation coolant pump.

Terminal 15, relief relay 2 Fuse and relay box No. Light switch Control unit with display in the dash panel insert Diagnostic connector. Heater switch Headlight range control Left headlight range control motor Right headlight range control motor. Terminal 15 relief relay Or Terminal 15 relief relay Brake light switch Brake pedal switch.Volkswagen Crafter Fuse Box Diagram Fitting locations overview. Automatic glow period control unit -J Terminal 15 relief relay -J Voltage supply relay 1 -J after November Relief relay 2 for terminal 15 -J only for models in the 3.

Auxiliary air heater element -Z Driver door control unit -J Diagnostic connection -U ABS control unit -J Evaluation unit for reducing agent level -G from November to May Reverse flow valve for reducing agent -N from November to May Pump for reducing agents -V from November to May -Not used- from May Supply unit for reducing agent metering system -GX from November NOx sensor control unit -J from November Relay 1 for voltage supply -J from November NOx sensor 2 control unit -J from November Relay for reducing agent metering system -J from November Pump for reducing agent -V from November Headlight washer system pump -V Turn signal relay for roof mounted turn signals -J from May Radio -R- Control unit with display for radio and navigation -J Mobile telephone operating electronics control unit -J Tachograph control unit -J Pre-selection clock -E Remote control receiver for auxiliary coolant heater -R Operating unit for centre dash panel -J Load area illumination switch -E to October Not used.

Electronic ignition lock -D9- El. Light switch -E1- Operating unit for centre dash panel -J Windscreen wiper motor -V. Fuel system pressurisation pump -G Steering column electronics control unit -J Engine control unit -J Air mass meter -G from May Evaluation unit for reducing agent level -G from May Heater element for crankcase breather -N from May Fuel pressure regulating valve -N Exhaust gas recirculation cooler changeover valve -N from May Reverse flow valve for reducing agent -N from May Exhaust gas recirculation cooler pump -V from May Pump for reducing agent -V from May Relief relay 2 for terminal 15 -J only for models in the 3.

Airbag control unit -JThis can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. The coolant pump control circuit is closely monitored by the powertrain control module PCMand numerous other control modules, such as the transmission control module, fuel injection control module, and body control module.

When the PCM or an accompanying control module detects a coolant pump control circuit malfunction, then the P trouble code will be triggered.

VW Golf 5 door connector locate - little attempt to repair

The P trouble code is usually the result of a faulty coolant pump control relay. However, the code can also be caused by damaged electrical components such as wires, connectors, fuses, and harnesses in the controller area network CAN bus, a broken ground wire, or a loose control module ground strap.

When the P trouble code is detected, the check engine soon Warning Light will likely illuminate on the instrument panel. The vehicle may also experience a diminished heater efficiency, as well as an overheating engine. A certified technician will look at the freeze frame data to assess the P code, and to check for the presence of other trouble codes.

If the mechanic notes that multiple trouble codes are present, then they will need to be addressed in the order in which they appear on the scanner.

The trouble codes will then be reset, and the vehicle restarted, so the mechanic can see if the P code remains detected. If not, then an intermittent error, or possibly an erroneous trigger is the likely cause of the code.

If the code remains detected, then the mechanic will visually inspect the electrical components in the CAN bus. If any fuses are blown, connectors are open or corroded, or wires are shorted, then they will need to be replaced.

The ground wire and ground strap will then be tested, and finally the coolant pump control relay should be inspected. If these inspections yield no results, then a specialized CAN scanner can be hooked up.

This diagnostic scanner will help the mechanic inspect the control modules, and pinpoint where the issue is originating. After any component is replaced, the mechanic will halt the inspection, reset the trouble codes, restart the vehicle, and check for the P code. By doing this, the technician will be alerted as soon as the issue is resolved. The most commonly made errors when diagnosing the P code come from a failure to properly comply with the OBD-II diagnosis protocol.

Mechanics should follow the protocol step by step at all times, as this helps ensure thorough and efficient inspections, and avoid erroneous repairs. It is very common for the P code to be joined by numerous other trouble codes. These codes may be in response to a communication issue created by the P code. If the codes are not addressed in the order in which they appear, unnecessary inspections and replacements may take place.

A vehicle with the P trouble code will still be drivable, though the engine may overheat, which can cause damage. Because of this, the vehicle should be inspected and repaired as soon as the code is detected. If either of these need to be replaced, they will also need to be reprogrammed.

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.Remember Me? Results 1 to 7 of 7. Thread: Crafter 2. Thread Tools Show Printable Version. Crafter 2. Turbo was replaced. EGR was replaced. Basic settings to test turbo actuator and solenoid valve was done and actuator pulled out fully.

On test drive full boost aquired and specified in measure value blocks was hPa. Exhaust was removed to check for blockages and found to be OK. Air mass at idling will vary between 1. Intake temperature is at degr without fault logged? When disconnected shows fault voltage high. This Crafter also does not have a airconditioning sytem fitted. Coolant pump no 2 was physically tested and found to be pumping.

vw crafter coolant pump relay location

On start up one can feel the coolant pump being activated and couple of seconds later switched off. Any suggestions will be highly appreciated! Last edited by Uwe; at AM. Reason: CODE tags. Why is Engine Coding zero? Maybe this is correct: C Verify Intake not contaminated. In Conjunction with Coding worked.

vw crafter coolant pump relay location

Just coolant pump 2 open circuit fault to be checked.Ad vertisements. In this article, we consider the first-generation Volkswagen Crafter, produced from to Here you will find fuse box diagrams of Volkswagen Crafter,andget information about the location of the fuse panels inside the car, and learn about the assignment of each fuse fuse layout.

How to check the fuses? How to replace a blown fuse? Why do car fuses blow? Types of automotive fuses. Table of Contents. Fuse box location. Fuse box diagrams. Learn more: How to check the fuses?

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vw crafter coolant pump relay location

If you continue to use this site we will assume that you are happy with it. Ok Privacy policy. Terminal 15 relief relay -J Voltage supply relay 1-J after November Relief relay 2 for terminal 15 -J only for models in the 3. Evaluation unit for reducing agent level -G from November to May Reverse flow valve for reducing agent -N from November to May Pump for reducing agents -V from November to May -Not used- from May Supply unit for reducing agent metering system -GX from November NOx sensor control unit -J from November Relay 1 for voltage supply -J from November NOx sensor 2 control unit -J from November Relay for reducing agent metering system -J from November Pump for reducing agent -V from November Mobile telephone operating electronics control unit -J Tachograph control unit -J Pre-selection clock -El Remote control receiver for auxiliary coolant heater -R Electronic ignition lock Control unit in dash panel insert -J Engine control unit -J from May Air mass meter -G from May Evaluation unit for reducing agent level -G from May Heater element for crankcase breather -N from May Fuel pressure regulating valve -N Exhaust gas recirculation cooler changeover valve -N from May Reverse flow valve for reducing agent -N from May Exhaust gas recirculation cooler pump -V from May Pump for reducing agent -V from May Relief relay 2 for terminal 15 -J only for models in the 3.

vw crafter coolant pump relay location

Brake light switch -F- from July to November Brake pedal switch -F from July to November Relief relay for terminal 15 -J Voltage stabiliser -J after November Relay for special constructions, terminal 15 -J after November Relief relay 3 for terminal 15 -J from November Operating unit for window regulator in driver door -E Heated rear window relay -J9- before June Relay 2 for heated rear window -J From July Rear left wing door window wiper motor -V Rear window wiper motor in right wing door -V Pre-selection clock -E Gearbox neutral position switch -F Display unit control unit -J Mobile telephone operating electronics control unit -J until May Reversing camera -R Battery regulation control unit -J until May Heater element for crankcase breather -N Tilting mechanism button -E Relay for special constructions, terminal 15 -J 6- pin connector -T6ah- from May 7- pin connector -T7f- Tail lift coupling point.