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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC P1644: Control Unit >> DTC Description >> DTC Detection Logic
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DTC Detection Logic

DTC CONSULT screen terms MELCO code DTC detection condition
(Trouble diagnosis content) [Malfunction type]
P1644 00 INTERNAL CONTROL MODULE
(An incorrect variant coding or configuration was detected.)
[NO SUBTYPE INFORMATION] 50 Diagnosis condition Ignition switch ON
Signal (terminal) -
Threshold Control unit detects internal malfunction.
Diagnosis delay time 1 time
P1644 00 INTERNAL CONTROL MODULE
(An incorrect variant coding or configuration was detected.)
[NO SUBTYPE INFORMATION] 72 Diagnosis condition
  • Ignition switch ON
  • CAN communication is active
Signal (terminal) -
Threshold Control unit detects internal malfunction.
Diagnosis delay time -
P1644 00 INTERNAL CONTROL MODULE
(An incorrect variant coding or configuration was detected.)
[NO SUBTYPE INFORMATION] 73 Diagnosis condition Ignition switch ON
Signal (terminal) -
Threshold Control unit detects internal malfunction.
Diagnosis delay time -