A8 Sedan V8-3.7L (AEW) (1997)
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Switch ignition on.
Using adapter cables from VAG1594 connector test kit:
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Connect jumper wire between test box terminals D11 and A4 (to activate fuel pump relay).
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Connect jumper wire between test box terminals A2 and E7 (to activate Motronic ECM power supply relay and supply voltage to fuel injectors).
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Connect harness connector for cylinder 1 fuel injector to fuel injector being tested on right cylinder bank (bank 1).
To check fuel injectors for right cylinder bank (bank 1):
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Temporarily connect jumper wire between test box terminals E11 (Ground) and terminal E1 for 30 seconds.
Specified value: 105-115 ml (3.5-3.8 oz.)
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Connect harness connector for cylinder 5 fuel injector to fuel injector being tested on left cylinder bank (bank 2).
To check fuel injectors for left cylinder bank (bank 2):
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Temporarily connect jumper wire between test box terminal E11 (Ground) and terminal E5, for 30 seconds.
Specified value: 105-115 ml (3.5-3.8 oz.)
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Switch ignition off.
If fuel delivery is not OK:
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Switch off fuel pump and Motronic ECM power supply relay (disconnect jumpered connections at test box).
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Replace faulty fuel injector(s).
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Install fuel rail.
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Check readiness code. If DTC memory has been erased, generate new readiness code.
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If fuel delivery for all fuel injectors is not OK:
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Check fuel pressure.
NOTE: When checking fuel injector delivery volume, also check injector spray pattern. The spray pattern must be the same for all 8 fuel injectors.
Installing
Installation of the fuel rail and the fuel injectors is the reverse of removal. Also observe the following special points:
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Replace all O-rings at all connections that have been opened.
To replace the front O-ring, do not remove the plastic cap from the valve head. Slip the O-ring over the plastic cap.
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Lubricate O-rings with clean engine oil.
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Install fuel injectors upright to stop (open connectors must face outward) and secure injectors with retaining clips.
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Place fuel rail with installed fuel injectors into position at intake manifold and press in to stop.
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Insert bolts by hand. Lightly push fuel rail by hand toward intake manifold and tighten bolts to 10 Nm (7 ft lb).
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Check fuel injectors for correct installation position (open electrical connectors face outward).
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Check to see that fuel injector retaining clamps are properly seated.