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Possible Causes

Possible Causes 
(K601) MFV CONTROL CIRCUIT SHORTED TO VOLTAGE
(K601) MFV CONTROL CIRCUIT SHORTED TO GROUND
(K601) MFV CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
(Z909) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
MANIFOLD FLOW VALVE
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  .