Engine Control System - Removal & Installation, System Checking (Convertible): Other Volvo C70 I

Accelerator pedal (AP), replacing

C70

1. See «Replacing the accelerator pedal module»(ref-403965-S00316216952011061000000) .

Activating components/functions

Activate the Volvo Scan Tool (ST) Components/functions by pressing the YES/NO button to start and stop activation.

Turn Ignition Key to position II, engine not running.

Scheme 158

The connectors for the heated oxygen sensors (HO2S) are on the transmission.

Scheme 159

Switch off the ignition.

Remove the air cleaner (ACL) housing.

Detach the inlet hose between the air cleaner (ACL) and the turbocharger (TC) from the turbocharger (TC).

Open the catches and disconnect both the connectors for the heated oxygen sensors (HO2S).

Heated oxygen sensors (HO2S), removing

See Heated oxygen sensor (HO2S), replacing .

Scheme 160

Note. Ensure that the ends of the protective sheath on the adapter cable point downwards so that water does not gather in the protective sheath.

Install

1. the adapter cable between the existing 4-pin connectors
2. a tie strap as illustrated.

Scheme 161

Install the adapter wiring between the existing 6-pin connectors.

Note. Ensure that the ends of the protective sheath on the adapter cable point downwards so that water does not gather in the protective sheath.

Install

1. the inlet hose between the air cleaner (ACL) and turbocharger (TC) on the turbocharger (TC)
2. the air cleaner (ACL) housing.

Camshaft seal/variable valve timing (VVT) unit, replacing (B5234T9; B5244T7; 2003-2004)

C70

1. For B5xx4T -2002, see «Replacing the camshaft seals / variable valve timing (VVT) unit»(ref-404029-S24847893182011061000000)
2. For B5xx4T 2003-, see «Camshaft seal/variable valve timing (VVT) unit, replacing»(ref-404029-S32187295762011061000000) .

Camshaft seal/variable valve timing (VVT) unit, replacing (B5244S/S2)

Special tools

9995452

9995651

9995719

9995718

9995474

9995451

9995919

9995450

Note. As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.

Scheme 162

Note. Crankshaft and camshafts must not be turned more than is stated in the method description! If the shafts are turned in any other way the valves may be damaged.

Remove

1. the cable from the battery negative terminal. First read «Battery, disconnecting»(ref-438278-S34403393232011120100000) .
2. the cross stay between the suspension turrets
3. the upper timing belt cover
4. the cover over the ignition coils
5. the inlet hose between the air cleaner (ACL) and throttle body (TB)
6. the crankcase ventilation hose from the inlet hose
7. place the inlet hose to one side
8. the upper engine stabilizer brace
9. the camshaft position (CMP) sensor housing
10. the trigger wheel
11. the rear cover for the intake camshaft
12. the servo reservoir and the expansion tank. Lift them up and place them on top of the engine WARNING: Ensure that no power steering fluid is spilled. Extremely flammable.
13. the auxiliaries belt
14. the front timing belt cover.

Scheme 163

Raise the car.

Remove

1. the right front wheel
2. the nuts for the cover in the fender liner.

Install the upper timing belt cover.

Turn the crankshaft clockwise until the markings on the crankshaft and camshaft pulley correspond.

Remove the upper timing belt cover.

Scheme 164

Slacken off the belt tensioner.

Slacken off the center screw for the belt tensioner slightly.

Hold the center screw in place. Turn the tensioner eccentric clockwise to 10 o'clock using a 6 mm Allen key.

Remove the timing belt from the camshaft pulleys.

Scheme 165

Use camshaft adjustment tool

1. Install camshaft adjustment tool «9995452»(ref-403953-S02369714572011061000000) at the rear of the camshafts.

Remove

1. the plug at the front edge of the variable valve timing unit (TORX 55)
2. the center screw in the variable valve timing unit (TORX 55). Carefully pull out the timing gear pulley with the VVT unit
3. timing gear pulley without VVT
4. the screws and the timing gear pulley.

Scheme 166

Carefully press in tool 9995651 between the sealing ring and the camshaft.

Carefully pry out the seal.

Cleaning

To clean the shaft journal and mating surface, use emery cloth P/N 951 1024.

Note. When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.

Scheme 167

Oil the new seal.

Install the new seal for the exhaust camshaft. Use drift 9995719 .

Install the new seal for the intake camshaft. Use drift 9995718 .

Scheme 168

Remove

1. slacken off the brake vacuum hose from the intake
2. the air cleaner (ACL) housing intake pipe from the connection above the radiator. Twist the pipe up
3. the manifold absolute pressure (MAP) sensor from the front cover plate
4. the evaporative emission system (EVAP) valve from the engine cooling fan (FC) shroud
5. release the wiring from the fan shroud.

Lift out the hose for the expansion tank from the holders on top of the fan shroud.

Disconnect both the engine cooling fan (FC) connectors.

1. both screws holding the fan shroud.

Carefully lift up the engine cooling fan (FC).

Install radiator protection 9995474 .

Checking and adjusting the variable valve timing unit

Check and adjust the variable valve timing unit. See: Variable valve timing unit, checking and adjusting

Scheme 169

Install

1. the front timing belt cover. Tighten to 12 Nm
2. the cover over the ignition coils
3. the upper timing belt cover
4. the auxiliaries belt
5. the expansion tank
6. the servo reservoir. Check that the hoses are correctly positioned
7. the starter motor. Tighten the screws at the transmission to 40 Nm . Tighten the screw for the support bracket. Tighten to 25 Nm . Remove the radiator protector.

Scheme 170

Carefully lower the fan shroud. Align it with the holders at the sides of the radiator.

Tighten both the mounting screws.

Connect the engine cooling fan (FC) connectors.

Press the hose down from the expansion tank into the holder on the fan shroud.

Secure the wiring with tie straps as before.

Press the manifold absolute pressure (MAP) sensor onto the holder at the front cover plate.

Press the evaporative emission system (EVAP) valve into the holder on the fan shroud.

Turn down the air cleaner (ACL) intake manifold and locate against the sleeve connector above the air conditioning aggregate.

Install

1. the brake vacuum hose
2. the trigger wheel. Tighten to 17 Nm
3. the camshaft position (CMP) sensor housing and a new cover. Tighten to 17 Nm
4. the torque rod bracket. Tighten to 50 Nm
5. the inlet hose between the air cleaner (ACL) and throttle body (TB)
6. the crankcase ventilation hose on the inlet hose
7. the plastic nuts for the cover in fender liner
8. the wheel. See «Installing wheels»(ref-404068-S25186346592011061000000)
9. the engine stabilizer brace. Tighten the screws at the suspension turrets. Tighten to 50 Nm . Tighten the engine bracket screw. Tighten to 80 Nm
10. the negative battery cable. First read «Battery, disconnecting»(ref-438278-S34403393232011120100000) .

Checking the engine

Test drive the car to check the function of the engine.

Rear camshaft seal

The following components must be removed when replacing the rear camshaft seal

1. the inlet hose between the air cleaner (ACL) and throttle body (TB)
2. the crankcase ventilation hose from the inlet hose
3. place the air cleaner (ACL) cover to one side
4. the cover over the ignition coils
5. the upper torque rod bracket
6. the camshaft position sensor (CMP) housing and trigger wheel.

Scheme 171

Pull out the seal. Use puller 9995919 . Use emery cloth 951 1024 to clean the shaft journal and mating surface.

Note. When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.

Lubricate the surface of the seal that the camshaft rotates against. Install the camshaft seal. Use drift 9995450 .

Note. The seal is normally pressed in so that it is level with the internal beveled edge. If the shaft journal is showing signs of wear, the seal can be pressed in 2 mm deeper by turning the drift socket.

Reinstall

Install

1. the trigger wheel. Tighten to 17 Nm
2. the camshaft position (CMP) sensor housing and a new cover. Tighten to 17 Nm
3. the torque rod bracket. Tighten to 50 Nm
4. the cover over the ignition coils
5. air cleaner (ACL) cover
6. the inlet hose between the air cleaner (ACL) and throttle body (TB)
7. the crankcase ventilation hose on the inlet hose

Check the engine compartment. Wipe the engine compartment clean.

Test drive the car to check the function of the engine.

Camshaft seal/variable valve timing (VVT) unit, replacing (B5244S6)

Special tools

9995452

9995651

9995719

9995718

9995474

9995451

9995919

9995450

Note. As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.

Removing the camshaft seal

Note. Crankshaft and camshafts must not be turned more than is stated in the method description. If the shafts are turned in any other way the valves may be damaged.

Remove

1. the cable from the battery negative terminal. First read: «Battery, disconnecting»(ref-438278-S34403393232011120100000) .
2. the cross stay between the suspension turrets
3. the upper timing belt cover
4. the cover over the ignition coils
5. the inlet hose between the air cleaner (ACL) and throttle body (TB)
6. the upper and lower engine stabilizer brace
7. the camshaft position (CMP) sensor housing
8. the trigger wheel
9. the servo reservoir and the expansion tank. Lift them up and place them on top of the engine WARNING: Ensure that no power steering fluid is spilled. Extremely flammable.
10. the auxiliaries belt
11. the front timing belt cover.

Position the engine according to the marking

Raise the car.

Remove

1. the right front wheel
2. the nuts for the cover in the wing liner.

Install the upper timing belt cover.

Turn the crankshaft clockwise until the markings on the crankshaft and camshaft pulley correspond.

Remove the upper timing belt cover.

Removing the timing belt

Slacken off the center screw for the belt tensioner slightly.

Hold the center screw in place. Turn the tensioner eccentric clockwise to 10 o'clock using a 6 mm Allen key.

Remove the timing belt from the camshaft pulleys.

Removing the timing gear pulley with the variable valve timing unit

Use camshaft adjustment tool

Install camshaft adjustment tool 9995452 at the rear of the camshafts.

Remove

1. the plug at the front edge of the variable valve timing (VVT) unit (TORX 55). NOTE: Collect any oil spillage when removing the plug using paper
2. the center screw in the variable valve timing unit (TORX 55). Carefully pull out the timing gear pulley with the variable valve timing (VVT) unit.

Replacing the camshaft seal

Carefully press in tool 9995651 between the sealing ring and the camshaft.

Carefully pry out the seal.

Cleaning

To clean the shaft journal and mating surface, use emery cloth P/N 951 1024.

Note. When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.

Oil the new seal. Install the new seal on the camshaft. Use drift 9995718 .

Scheme 172

Oil the new seal.

Install the new seal on the camshaft. Use drift 9995718 .

Check and adjust the variable valve timing unit. See: Variable valve timing unit, checking and adjusting

Installing components

Install

1. the front timing belt cover. Tighten
2. the cover over the ignition coils
3. the upper timing belt cover
4. the auxiliaries belt
5. the expansion tank
6. the servo reservoir. Check that the hoses are correctly positioned
7. the starter motor. Tighten the screws at the gearbox to 40 Nm .

Install

1. the trigger wheel
2. the camshaft position (CMP) sensor housing
3. the upper and lower engine stabilizer brace
4. the inlet hose between the air cleaner (ACL) and throttle body (TB)
5. the plastic nuts for the cover in wing liner
6. the wheel. See «Installing wheels»(ref-438288-S23494824102011120100000)
7. the engine stabilizer brace. Tighten the screws at the suspension turrets and the screw for motor bracket. See «Tightening torque»(ref-404053-S40098285792011061000000)
8. the cable to the battery negative terminal. First read «Battery, disconnecting»(ref-438278-S34403393232011120100000) .

Test drive the car to check the function of the engine.

The following components must be removed when replacing the rear camshaft seal

1. the inlet hose between the air cleaner (ACL) and throttle body (TB)
2. place the air cleaner (ACL) cover to one side
3. the cover over the ignition coils
4. the upper and lower engine stabilizer brace
5. the camshaft position sensor (CMP) housing and trigger wheel.

Replacing the rear camshaft seal

Pull out the seal. Use puller 9995919 . Use emery cloth 951 1024 to clean the shaft journal and mating surface.

Note. When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.

Lubricate the surface of the seal that the camshaft rotates against. Install the camshaft seal. Use drift 9995450 .

Note. The seal is normally pressed in so that it is level with the internal bevelled edge. If the shaft journal is showing signs of wear, the seal can be pressed in 2 mm deeper by turning the drift socket.

Install

1. the mixer. Tighten
2. the camshaft position (CMP) sensor and new cover. Tighten
3. the upper and lower engine stabilizer brace
4. the cover over the ignition coils
5. air cleaner (ACL) cover
6. the inlet hose between the air cleaner (ACL) and throttle body (TB)

Check the engine compartment. Wipe the engine compartment clean.

Test drive the car to check the function of the engine.

General

CAN (Controller Area Network) is a standardized system for multiplex-communication. Volvo has developed a new standard for multiplex communication - VOLCANO. VOLCANO is a further development of CAN and operates with real time operation and prioritizing. The description of prioritizing is developed from VOLCANO but is designated CAN.

The standard for Control area network (CAN) specifies

1. That two cables should be used (CAN H and CAN L)
2. Which voltage levels should be used
3. What a message should look like
4. How transfer errors should be handled.

Scheme 173

The CAN H and CAN L cables must not be confused with HS CAN and LS CAN which are speeds on the Controller area network. CAN H and CAN L are a way of distributing signals within the multiplex communication network.

Communication occurs through two cables. These two cables are paired together. CAN H is always white and CAN L is always green.

The cables are made of copper and are easily identified by the green and white colouring.

The voltage levels for communication occur using differential voltage levels.

The reason for communicating using paired cables and differential voltage levels is that the network becomes less sensitive to interference.

The same message is transferred simultaneously by both cables, but different voltage levels are used.

1. Binary 1 = 2.5 V on both CAN H and CAN L.
2. Binary 0 = 4 V on CAN H and 1 V on CAN L.

Average voltage level is 2.5V.

Scheme 174

The message consists of the following components

1. Identifier ("flag"), which indicates the message identity and prioritisation
2. Data information (value, information etc.)
3. Check sum, used to check that the message has arrived correctly
4. Stop signal, which indicates that the message has finished.

A complete Controller area message is called a frame.

Prioritising

Conflicts can occur in a network when several control modules wish to send a message at the same time. For example when the driver presses the brake pedal at the same time as the passenger changes the climate control settings and a passenger in the rear seat opens the power window.

For safe function the messages must be prioritised. In addition the time delays which occur in the event of a queue situation must be held with reasonable limits. This is so that the customer does not experience the system as slow.

To solve problems with conflicts and time delays there is a priority order of messages to ensure good functionality.

Prioritisation of messages is determined by the number of zeroes at the beginning of a message, the more zeroes the higher the priority.

Prioritisation occurs as follows

1. When the network is available all the control modules with "something to say" send bit one in their message
2. All the control modules detect what has been transmitted on the network
3. If a control module has transmitted 0 those that have sent 1 stop and wait until the next time the network is available
4. Those that transmitted 0 transmit bit two of the message
5. If a control module has transmitted 0 as bit two those that have sent 1 stop and wait until the next time the network is available and so on.

The message with the highest priority (most zeroes at the beginning) "wins" and is sent first.

The end of a message is seven zeroes. The control modules then know that the network is available and a new message can be sent in priority order.

Two types of message

There are two types of message in the system

1. Periodical frames. These messages are sent regularly and give the present status of a parameter. They are used for information which is frequently updated, speed signals for example
2. Event frames, which are only sent when predetermined conditions have been met. This type of message is used for things that seldom occur, raising / lowering a window for example.

The message can contain an update bit which states how "fresh" the information is.

The system assumes that the receiver has received the message so an acknowledgement is not sent (a reply is only sent to a direct question from another control module).

But the receiver knows how often it should receive a message about which status applies. If the message is missing the receiver can connect an emergency program and / or set a diagnostic trouble code.

Compatibility

The units must "speak" the same language and must be compatible with each other. A standardized communication protocol is used for this.

Signal configuration (sfg) contains the language between the units. If any module has a signal configuration which does not correspond to other units the module cannot communicate. This means that all the units must have compatible signal configuration. The signal configuration is occasionally modified so that the new messages are added and old messages removed.

Configuration

Instructions for the following are downloaded when a system is configured

1. Which control modules are included in the system (for example central electronic module, and others.)
2. Which control module should do what (for example "you are the control module for the passenger door - you are the control module for the driver's door")
3. Which functions should be included (for example if the alarm function should be on or off)
4. Which components are connected to the control modules (for example whether the inclination sensor is included in the alarm or not)
5. Which messages a control module is to transmit and which it is to receive
6. Where the different data should be stored.

The configuration must be adapted after installation of accessories and must be downloaded again after any control module is replaced. The configuration is adapted and downloaded via VIDA.

Note. Even if two cars appear identical, they may behave differently because of differing configurations, a parameter may have been modified by, e.g., the customer or workshop.

Carbon filter container, replacing

1. For C70, see «Carbon filter container, replacing»(ref-403955-S13465566912011061000000) .

Checking exhaust system

Special tools

9995544

9995546

Connection of tools

Note. The exhaust system may be extremely hot if the car has been driven immediately before commencing work. Allow the system to cool before starting the procedure, otherwise the special tool may be damaged by the heat.

Scheme 175

1. Remove exhaust system tail pipe.
2. Attach tool «9995546»(ref-403953-S01007068732011061000000) and pressure regulator «9995544»(ref-403953-S05241159092011061000000) to exhaust system.
3. Adjust pressure to 0.4 bar (5.8 psi). Lower pressure may be necessary depending on condition of exhaust system.

Scheme 176

1. Check exhaust system by spraying soapy water on all joints and connections between cylinder head and rear HO2S.
2. Only extremely small and slowly increasing bubbles are permissible.

Checking for air leakage in exhaust system

For S60, V70 2000-, XC70, S80, XC90 and C70

1. For 1999 model year cars, see «Checking for air leakage in the exhaust system»(ref-403972-S34152999212011061000000)
2. For 2000- model year cars, see «Checking for air leakage in the exhaust system»(ref-403972-S14998600972011061000000) .

Checking for air leakage in the exhaust system

Special tools

9995544

9995546

Engagement

Install tool 9995546 and pressure regulator 9995544 on the exhaust system.

Adjust the pressure to 0.4 bar . Depending on the condition of the exhaust system a lower pressure may be necessary.

Check the exhaust system. Spray a soap solution on all joints and connections between the cylinder head and the rear heated oxygen sensor (HO2S).

Only very small and slow bubbles are permissible.

Special tools

9995544

9997085

Note. The illustrations in this service information are used for different model years and / or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Scheme 177

Remove

1. the nut where the three-way catalytic converter (TWC) and exhaust system separate
2. the gasket. Separate the exhaust system from the three-way catalytic converter (TWC).

Scheme 178

Install

1. The tool (1) «9997085»(ref-403953-S05162907402011061000000) using a new gasket
2. pressure regulator «9995544»(ref-403953-S05241159092011061000000) on tool «9997085»(ref-403953-S05162907402011061000000) . Adjust the pressure to 0.4 bar .

Check the exhaust system by spraying a soap solution on all joints and connections between the cylinder head and the rear heated oxygen sensor (HO2S). Only very small and slow bubbles are permissible.

Removing tools

Remove

1. pressure regulator «9995544»(ref-403953-S05241159092011061000000)
2. tool «9997085»(ref-403953-S05162907402011061000000) .

Install

1. a new gasket where the exhaust system and three-way catalytic converter (TWC) divide
2. a new nut for the exhaust system. Tighten.

Start the engine. Check for leaks where the three-way catalytic converter (TWC) and the exhaust system divide.

Checking intake system

Special tools

9814215

9995544

9995545

9995843

Preparations

1. Check that all hoses are intact and are in position with hose clips tightened.

Scheme 179

1. Disconnect fresh air hose from MAF sensor.
2. Connect tool «9995545»(ref-403953-S32978956662011061000000) and pressure regulator «9995544»(ref-403953-S05241159092011061000000) to hose and tighten hose clip.
3. Use hose clamp to block crankcase ventilation hose.
4. Remove oil filler cap.
5. Disconnect bottom hose from EVAP valve.

Scheme 180

1. Adjust regulator until pressure gauge reads max. 0.3 bar (4.35 psi).
2. Gentle hissing sound can be heard from oil filler opening due to opening of an intake valve and leakage of cylinder pressure past piston rings.

Scheme 181

1. Check components and connections as per «Checking components»(ref-403972-S03454243152011061000000) and «Checking connections»(ref-403972-S40519885922011061000000) .
2. Coat connections with soapy water if unsure whether leakage is present.
3. Bubbles are permissible around throttle spindle.
4. Small bubbles are permissible between TB and intake hose (if of plastic). No bubbles are permissible with rubber hose.
5. Check for air leakage from EVAP valve. No leakage is permissible.

Checking components

The following points should be checked with particular care if leakage is suspected. Both hoses and connections should be checked.

Scheme 182

1. A Upper charge-air pipe
2. B Turbocompressor and wastegate valve
3. C Brake servo
4. D Combined instrument
5. E Crankcase ventilation and tee-piece
6. F MAF sensor
7. G Fresh air intake hose
8. H TC valve
9. I TB
10. J Lower charge-air pipe
11. K IAC valve
12. L EVAP system carbon filter
13. M EVAP valve
14. N EGR vacuum controller
15. O EGR valve
16. P Vacuum connections to intake manifold
17. Q Charge Air Cooler (CAC)
18. R Intake manifold and gasket
19. S Crankcase ventilation and oil trap
20. T Fuel pressure regulator
21. U Injectors and seals
22. V Exhaust system

Checking connections

The following points should be checked with particular care if leakage is suspected. Both hoses and connections should be checked.

Scheme 183

1. A IAC valve pressure regulator
2. B Turbo Charge Air Cooler (CAC)
3. C Combined instrument
4. D TC valve
5. E EVAP system
6. F EGR system
7. G Crankcase ventilation

Checking EVAP valve

Remove following to gain access to EVAP valve

1. Valve from bracket
2. Soundproofing from valve

Scheme 184

1. tool «9995545»(ref-403953-S32978956662011061000000) and pressure regulator «9995544»(ref-403953-S05241159092011061000000) from fresh air hose
2. hoses from EVAP valve
3. connector
4. Connect hose from vacuum pump «9995843»(ref-403953-S06330547042011061000000) to connection point under connector.
5. Pump up vacuum
6. Vacuum gauge should indicate steady value.
7. If vacuum falls, replace EVAP valve.

Reinstall valve, hoses, soundproofing and connector on completion of check. Use clamp 9814215 and new hose clip, P/N 97 81 65-9, when installing.

Special tools

9995544

9995546

Connecting

Remove the exhaust tail pipe.

Install tool 9995546 with pressure regulator 9995544 on the exhaust system.

Adjust the pressure to 0.4 bar . Depending on the condition of the exhaust system a lower pressure may be necessary.

Check exhaust system by spraying a soap solution on all joints and connections between cylinder head and rear heated oxygen sensor (HO2S).

Only very small and slow bubbles are permissible.

Install tail pipe on exhaust system after check.

Checking fuel and residual pressures

Note. To check the fuel and residual pressures for S70/V70/C70 , see Checking fuel and residual pressures .

Note. For vehicles with demand activated fuel pumps (FP), see VIDA vehicle communication Quick test of fuel pump (FP).

Scheme 185

1. Connect the pressure gauge according to «Connecting fuel pressure gauge»(ref-403954-S34277076412011061000000)
2. Remove the soundproofing panel
3. Remove the fuel pump (FP) relay (CMI 12 in the passenger compartment)
4. Connect a cable to the relay base as illustrated.

Read off the line pressure from the pressure gauge. The line pressure must be 375-395 kPa.

Check the residual pressure if the fuel pressure is OK.

Remedy as necessary.

Other information

1. For the location of and to replace the fuel pump (FP) relay, see «Central electronic module (CEM), replacing»(ref-438278-S24381854472011120100000)
2. For the location of and to replace the fuel pump (FP), see «Level sensor, fuel tank/fuel pump, replacement»(ref-403954-S26810674712011061000000)
3. For the location of and to replace the fuel filter, see «Replacing the fuel filter»(ref-438318-S33908550562011120100000)
4. To disconnect the pressure gauge, see «Disconnecting fuel pressure gauge»(ref-403954-S03914982172011061000000)

Checking the residual pressure

1. Switch off the ignition
2. Disconnect the cable between the terminals on the relay base
3. Reinstall the fuel pump (FP) relay.

The line pressure must not fall below 200 kPa within 20 minutes of the fuel pump (FP) being shut-off.

Remedy as necessary.

Other information

1. For the location of and to replace the injector on 5-cylinder engines, see «Injector/pulse damper, replacement»(ref-404036-S29374937892011061000000) . For 6-cylinder engines, see «Injector/pulse damper, replacement»(ref-404036-S28292103182011061000000)
2. For the location of and to replace the fuel pump (FP) relay, see «Central electronic module (CEM), replacing»(ref-438278-S24381854472011120100000)
3. For the location of and to replace the fuel pump (FP), see «Right side fuel pump with level sensor»(ref-438318-S31591968602011120100000)
4. To disconnect the pressure gauge, see, «Disconnecting fuel pressure gauge»(ref-403954-S03914982172011061000000) .

Explanation

Not all the parameters described need to be implemented in the control module. This varies from system to system.

Frozen values are parameter values that are stored when a diagnostic trouble code (DTC) is stored.

Bank 1 indicates cylinders 1-3 on 6 cylinder engines and all cylinders on 5-cylinder engines.

Bank 2 indicates cylinders 4-6 on 6-cylinder engines.

Condition, fuel trim bank X

Fuel trim can assume 5 different conditions

1. no fuel trim, the start conditions have not been met. . This condition occurs at the crank or immediately after start before fuel trim has started
2. fuel trim with 2 probes . This situation occurs during driving when both probes are used during fuel trim (part load).
3. no fuel trim, operation with predefined values . This situation occurs during hard acceleration or during fuel shut-off when there is no fuel trim and operation is under predefined values.
4. no fuel trim, operation with system fault . This situation occurs when an earlier diagnostic trouble code (DTC) was stored that caused the fuel trim to be disabled
5. fuel trim with one probe (front) . This situation occurs at idling speed or during light acceleration when one probe (front) is used during fuel trim.

Calculated load, %

Indicates the calculated engine load. The value is given as a percentage of full load.

Engine coolant temperature (ECT), °C

Indicates the engine temperature. The value is given in °C.

Engine speed, rpm

Indicates the engine speed (RPM). The value is given in rpm

Vehicle speed, km/h

Indicates the vehicle speed. The value is given in km/h.

Boost pressure

Indicates the engine volumetric efficiency. The value is given as a % compared to the atmospheric pressure (during positive boost pressure the value will be higher than 100%).

Battery voltage

Indicates the system voltage. The value is given in volts.

Throttle angle

Indicates the throttle angle. The value is given as a percentage of maximum reading.

Air mass

Indicates the mass air flow. The value is given in kg/h.

Outside temperature

Indicates the outside temperature. The value is given in °C.

Distance

Indicates the mileage when the diagnostic trouble code (DTC) was stored. The value is given in km.

ECU power supply (V)

The value indicates the voltage supply from the system relay to the engine control module (ECM).

Atmospheric pressure (Pa)

The value indicates the ambient pressure. The Engine control module (ECM) receives a signal from the atmospheric pressure sensor.

HINT: The sensor is integrated in the Engine control module (ECM).

Fuel level (l)

The value shows the fuel level in the tank. The Engine control module (ECM) receives a signal from fuel level sensor.

HINT: The sensor is connected to the Central electronic module (CEM) and information is sent to the Engine control module (ECM) via CAN.

Ambient temperature (°C)

The value indicates the ambient temperature. The Engine control module (ECM) receives a signal from the outside temperature sensor.

HINT: The sensor is connected to the Central electronic module (CEM) and information is sent to the Engine control module (ECM) via CAN.

Fuel tank pressure (Pa)

The value indicates the calculated tank pressure. The Engine control module (ECM) calculates the average pressure with the help of the measured power consumption on the leak diagnostic unit's pump. The pressure will rise from 0 Pa to approx. 4500 Pa during the test.

HINT: The calculated pressure can differ from the measured pressure by 15 %. This is normal.

Estimated leak (mm)

The value shows the diameter of the leak. The Engine control module (ECM) calculates the diameter with the help of measurements made during testing.

HINT: The parameter should be used to get an understanding of how close to the diagnostic trouble code limit the system is. If the estimated size of the leak is very close to the diagnostic trouble code limit, fault tracing should probably be carried out despite the test result for the tank system showing "No leakage found", especially if the diagnostic trouble code (DTC) for leakage was initially generated.