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Compression Ignition Addict
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These attachments may help.

Summary of VGT solenoid testing from the second attachment:

Technician Feeling Cam Follower Movement
To check VGT operation, first perform a KOEO. Also look at the MAP, BARO, and EP readings. If these appear unusual, address these before checking VGT operation. Then raise engine speed to 3,500 rpm and hold it at that point while monitoring exhaust pressure (EP) and manifold gauge pressure (MGP).
• Exhaust pressure should be between 20 and 28 psi and manifold gauge pressure should be between 2 and 6 psi.
• If MGP and EP are both high:
– Disconnect the VGT control valve electrical connector and rerun the test.
– If MGP and EP change with the electrical connector disconnected, inspect the wiring harness andconnections.
– If MGP and EP do not change (lower) when the VGTCV is unplugged, remove the valve from the turbocharger.
• Plug the VGTCV into the engine harness, being careful to handle the valve by its solenoid body only.
• Then apply pressure to the cam follower with your thumb while actuating the valve with the WDS and look for
– If the valve does not move, replace the valve.

VGTCV Electrical Test
The VGTCV can be tested electrically, using a digital volt-ohm meter (DVOM) to measure the resistance of the actuator coil.
• The resistance should be between 3.4 and 4.2 ohms @ 73°F EOT.
• If the engine is hot, the resistance should be between 4.4 and 5.3 ohms @ 200°F EOT.
CAUTION: Do not raise the engine rpm above 1,200 while controlling the VGT. Doing so can cause damage to the turbocharger or engine.


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