1990 Nissan-Datsun Van XE, StandardFACTORY OEM SERVICE PROCEDURE

Trouble Code Identification Chart

TROUBLE CODE IDENTIFICATION CHART

Code (1) System Affected Probable Cause
11  Crank Angle Sensor Loss of signal
12  Mass Airflow Sensor MAF signal high or low
13  Coolant Temp. Sensor Open/shorted circuit
14  Vehicle Speed Sensor (VSS) No VSS signal
21  No Ign. Ref. Pulse Loss of primary signal
31  ECU Signals out of range
32  EGR Sensor (Calif.) No EGR action
33  O2 Sensor Open circuit or high O2 signal
35  EGR Temp. Sensor (Calif) Open/shorted circuit
43  Throttle Sensor Open/shorted circuit
45  Injector Leak (Calif.) Leak at injector
51  Injector Injector not working
55 No Malfunction Recorded No faults detected
(1) Not all trouble codes will activate CHECK ENGINE light or are available on all models.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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