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Home >> Lincoln >> 2004 >> Aviator AWD V8-4.6L DOHC VIN H >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Tests >> Test H
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Test H

PINPOINT TEST H: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL


Test H1:






Test H1-H2:






Normal Operation
The PCM communicates with the diagnostic tool through the SCP communications network circuits 914 (TN/OG) and 915 (PK/LB). If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 914 (TN/OG) and 915 (PK/LB) between the PCM C175b and the data link connector (DLC) C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuit 914 (TN/OG) or 915 (PK/LB), damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector.

Possible Causes
- SCP circuits 914 (TN/OG) or 915 (PK/LB) shorted to ground or open
- DLC C251
- PCM
- PCM C175b
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