LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 1983 >> Sentra Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR System - Diesel >> System Testing >> System Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Check

  1. Check vacuum hoses and electrical harness connectors. With engine off, check EGR control valve and throttle chamber diaphragm/rod for binding or sticking.
  2. With engine cold, the EGR control valve should not operate and the throttle valve should be open when engine is accelerated. If the control valve operates or the throttle valve is closed, check water temperature sensor. If sensor is functioning properly, replace faulty EGR control unit.
  3. With engine idling at normal operating temperature, EGR control valve should open and throttle valve should be closed. While gradually increasing engine speed, the throttle valve should open and the control valve should close. If not, check each valve individually.
  4. Disconnect harness connector at each solenoid valve and, with engine idling, apply battery voltage to the terminals in 1 connector. Repeat test with other solenoid valves
  5. When voltage is applied, the EGR valve should operate and the throttle valve should close. If EGR and throttle valves are operating properly, check revolution sensor, potentiometer and electrical connections.
  6. If these systems are okay, replace EGR control unit. If the EGR and throttle valves do not operate as described, check solenoid valves, EGR control valve and throttle diaphragm.
scientia non olet · About LEMON Manuals