Testing and Inspection for TT L4-18L Turbo Exhaust Bypass Valve
Exhaust Bypass Valve: Testing and Inspection
With Generic Scan Tool
Recirculating Valve For Turbocharger, Checking
NOTE: Valve opens between connection to intake manifold and connection to deceleration shut-off valve with no voltage. Connection to vacuum
reservoir is closed.
Test sequence
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Switch ignition off.
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Disconnect connector from Recirculating valve for turbocharger -N249-.
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Measure resistance between terminals of valve.
Specified value: 27...30 Ohm
If specified value is not obtained:
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Replace Recirculating valve for turbocharger -N249-.
If specified values are obtained:
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
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Check wire between test box socket 105+2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
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Also check the wire for short circuit to B+ and Ground (GND).
If no malfunctions are found in wire:
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Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
If no malfunctions are found in wires:
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Replace Engine Control Module (ECM).