Nissan Sentra manuals

Nissan Sentra Service Manual: C1606 EPS Motor

DTC Logic

DTC DETECTION LOGIC

Dtc Display item Malfunction detected condition Possible cause
C1606 EPS MOTOR When the motor driver malfunction of EPS control unit or EPS motor malfunction is detected.
  • Harness or connector
  • EPS motor
  • Eps control unit

Dtc confirmation procedure

1.Preconditioning

If dtc confirmation procedure has been previously conducted, always turn ignition switch off and wait at least 10 seconds before conducting the next test.

>> Go to 2.

2.Dtc reproduction procedure

With consult


  1. Turn the ignition switch off to on.

  2. Perform eps self-diagnosis.

Is dtc “C1606” detected? Yes >> proceed to diagnosis procedure. Refer to stc-27, "diagnosis procedure".

No >> inspection end.

Diagnosis Procedure

1.Check terminals and harness connectors

Check eps control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace the malfunctioning parts.

Is the inspection result normal? Yes >> go to 2.

No >> repair or replace the malfunctioning parts.

2.PERFORM SELF-DIAGNOSIS

With consult


  1. Erase self-diagnostic results for eps.

  2. Turn the ignition switch OFF, and then wait 10 seconds and more.

  3. Perform self-diagnosis for EPS.

Is DTC C1606 detected? YES >> Replace EPS control unit. Refer to STC-39, "Removal and Installation".

NO >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

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Other materials:

Overdrive control switch
Component Function Check 1.CHECK SPORT INDICATOR LAMP FUNCTION Check OD OFF indicator lamp turns ON for approx. 2 seconds when ignition switch turns ON. Is the inspection result normal? YES >> GO TO 2. NO >> Go to TM-239, "Diagnosis Procedure". 2.CHECK SPORT MODE SW ...

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Checking bulbs
With all doors closed, apply the parking brake and place the ignition switch in the ON position without starting the engine. The following lights will come on: If equipped, the following lights come on briefly and then go off: If any light fails to come on, it may indicate an open circuit ...

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