4.2L V8 5V Generic Scan Tool, Engine Code(s): Bfm: Adjustments Audi A8 D3 facelift

Camshaft, Checking Adjustment

> Camshaft Adjustment, Function

> Camshaft Adjustment Valves, Checking

Camshaft Adjustment, Function

The adjustment of intake camshaft is load- and RPM dependent. Exhaust camshafts are not adjusted.

Oil pressure is switched to camshaft adjusters (mechanical adjustment devices) via the solenoid valves for camshaft adjustment.

The camshaft adjusters then set intake camshafts of both cylinder banks to the direction "early" , meaning that the intake valves open earlier.

Solenoid Valve for Camshaft Adjustment, Electrical Testing

1. Disconnect connector at respective solenoid valve for camshaft adjustment.

Scheme 707

1. Perform a resistance measurement between terminals on solenoid valve using portable multimeter VAG1526.

Specified value: 10 to 18 ohms.

If specified value is not obtained.

1. Replace respective Camshaft Adjustment Valve 1 N205/Camshaft Adjustment Valve 2 N208.
2. Read readiness code --> «Readiness Code, Reading»(ref-289208-S39034557822008062700000) . If DTC memory was erased, readiness code must be generated again --> «Readiness Code, Generating»(ref-289208-S31500925522008062700000) .

If specified value is obtained, check voltage supply.

Voltage Supply of Solenoid Valves for Camshaft Adjustment, Checking

1. Disconnect connector at respective solenoid valve.

1. Connect voltage test lamp VAG1527 to terminal 1 (B+) of connector and to engine Ground (GND) using cables from connector test kit VAG1594.
2. Operate starter for a few seconds. Engine may also start up during this.

LED must light up.

If diode test lamp does not light up, the following tests must be performed

1. Check fuse for solenoid valves for camshaft adjustment. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

If fuse is OK.

1. Check wire connection from terminal 1 to Fuel Pump (FP) relay via fuse for continuity. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

If voltage test lamp lights up, check activation.

Activation of Valves for Camshaft Adjustment, Checking

1. Disconnect connector at respective solenoid valve.

1. Connect voltage test lamp VAG1527 using cables from connector test kit VAG1594 to sockets 1 (B+) and 2 of connector for respective solenoid valve.
2. Operate starter for a few seconds. Engine may also start up during this.

Diode test lamp must blink during activation of camshaft adjustment.

If LED lights up continuously.

1. Check wire connection of socket 2 of respective connector of solenoid valve for camshaft adjustment for short circuit to Ground (GND).

If voltage test lamp does not blink.

1. Check wire connection.

Camshaft Adjustment Valve 1 N205

Wire resistance: max. 1.5 ohms

1. Repair short circuit in wiring or open circuit in wiring if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

Camshaft Adjustment Valve 2 N208

Wire resistance: max. 1.5 ohms

1. Repair short circuit in wiring or open circuit in wiring if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

If there is neither an open circuit in wiring nor a short circuit, replace Engine Control Module (ECM). --> Engine Control Module, Replacing .

1. Read readiness code --> «Readiness Code, Reading»(ref-289208-S39034557822008062700000) . If DTC memory was erased, readiness code must be generated again --> «Readiness Code, Generating»(ref-289208-S31500925522008062700000) .
2. If no malfunction was recognized for all previous tests, replace the respective mechanical camshaft adjuster. --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(ref-289202-S29250302232008062700000)