engine AUDI A4 1995 B5 / 1.G APB Engine Valve Gear Service User Guide

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Test sequence

- Connect VAS 5051 tester or VAG 1551 scan
tool and select control module for engine
electronics using "address word" 01. Engine
must run at idle for this.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01

Rapid data transfer
HELP
Select Function XX

When indicated on display
- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q-
button to confirm input.
Initiate basic settin
g
Q
Input display group number XXX

When indicated on display
- Press buttons -0-, -9- and -4- to select "display group number 094" and
press -Q- button to confirm input.
System in basic setting 94
1
2
3
4

When indicated on display
Camshaft adjustment is checked for function.
- Increase engine speed to above 2000 RPM.
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Display fields

1 2 3 4
Display group 94: Function of camshaft adjustment
Display 1 RPM Text Text Text
Indicated Engine speed (RPM) Camshaft adjustment Test result, Bank 1 Test result, Bank 2
Specified value >2000 Cs-CM. ON Test ON
Sys. OK Test ON
Sys. OK
Note: If "not OK" is indicated in display field 3 and/or 4:

- Check solenoid valve for camshaft
adjustment.
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- Initiate output Diagnostic Test Mode (DTM) and
activate the valve for camshaft adjustment.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01

If valves do not click during output Diagnostic
Test Mode (DTM):

Checking internal resistance

- Switch ignition off.

- Remove bolts (arrows) and remove engine covers -A- and -B-.

- Remove air distributor (arrows).
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- Disconnect connector from solenoid valve.

If specified value is not obtained:
Checking voltage supply - Connect multimeter at valve for resistance measurement.

Specified value: 10 ... 18
- Replace valve.
- Disconnect connector from solenoid valve.

If LED does not light: - Connect VAG 1527B voltage tester as follows:Harness connector
terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.

LED must light.
- Perform following tests marked with dots:
Check fuse of solenoid valves for camshaft adjustment.
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Electrical Wiring Diagrams, Troubleshooting & Component Locations
If no malfunctions are detected:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24

Check wire connection from terminal 1 of connector via fuse -S234-
(in fuse holder, socket 34) to Fuel Pump (FP) relay for open circuit:
- Repair open circuit if necessary.
- Check Fuel Pump (FP) relay.
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Checking activation

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 01

If LED does not blink or if it remains constantly lit:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24
- Connect VAG 1527B voltage tester between terminal 1 (+) and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate valve for
camshaft adjustment.

LED must blink.
- Connect VAG 1598/31 test box at wiring harness to ECM, do not
connect ECM.
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Valve 1 for camshaft adjustment -N205- and valve 2 for camshaft
adjustment -N208-
If wire connection is OK:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition, Engine Code(s): APB, Repair Group 24

If no malfunctions are detected: - Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
terminal
VAG 1598/31 or test box
Bushing
2 Electrical Wiring Diagrams, Troubleshooting
&Component Locations
- Repair Ground (GND) connection or open circuit if necessary.
- Replace Engine Control Module (ECM).- Replace mechanical camshaft adjuster.
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Notes:

When new lifters have been installed the engine
must not be started for about 30 minutes. The
hydraulic compensation elements must settle
(otherwise valves will strike pistons). Then turn
crankshaft two full revolutions before starting.
After working on the valve gear, turn over the
engine carefully at least two revolutions by
hand to ensure that none of the valves make
contact when the starter is operated.

- Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver.
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Hydraulic lifters, checking


Notes:

Replace malfunctioning lifters completely (lifters
cannot be adjusted or repaired).
When new lifters have been installed the engine
must not be started for about 30 minutes
(otherwise valves will strike pistons).
Irregular valve noises when starting engine are
normal.

- Start engine and run until coolant temperature
reaches approx. 80 C.

- Increase engine speed to about 2500 RPM for
approx. 2 minutes: if necessary, perform road
test.
If the hydraulic lifters are still noisy, locate
malfunctioning lifters as follows:

- Remove cylinder head cover.

- Rotate crankshaft clockwise by turning securing
bolt for toothed belt sprocket until cams of lifters
to be checked are pointing upward.
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Valve guides, checking

When repairing engines or cylinder heads with
leaking valves, it is not sufficient to reface the
valve seats and replace the valves. The valve
guides must also be checked for wear. This is
particularly important on high-mileage engines.

Wear limit
If the wear limit is exceeded, replace cylinder head. - Insert valve into valve guide so that end of valve stem is flush with end
of guide. The valve stems have different diameters, so only use an inlet
valve in an inlet guide and an exhaust valve in an exhaust guide.
- Measure amount of rock. Inlet valve guide
Exhaust valve guide
0.8 mm 0.8 mm
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