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NS10 - Checking Injector Driver Circuits

  1. Connect DRB II to engine harness connector. Disconnect all injectors. Put system in ATM Test Mode "02". Connect negative voltmeter lead to ground and touch positive voltmeter lead to Dark Green/Black wire in each injector connector. If there is no voltage at one or more of the connectors, repair Dark Green/Black wire for an open circuit to injector connector.
    Fig 1: Checking Injector Driver Circuits (Turbo) "A"
    G55911
  2. If there is battery voltage at each connector, connect No. 1 injector and listen for a click. Disconnect No. 1 injector. Connect No. 2 injector and listen for a click. Disconnect No. 2 injector. Connect No. 3 injector and listen for a click. Disconnect No. 3 injector. Connect No. 4 injector and listen for a click.
  3. If any injector does not click, replace injector. Before replacing injector, check Tan and White wires to injectors for an open circuit. If No. 1 and No. 2 injectors do not click, go to next step. If injectors No. 3 and No. 4 do not click, go to step 6).
  4. Turn ignition off. Disconnect 14-pin connector from SMEC. Connect ohmmeter to 14-pin connector cavity No. 9 and ground. If there is continuity, repair White wire to cavity No. 9 for a short to ground. If there is no continuity, connect ohmmeter to 14-pin connector cavity No. 9 and White wire of injector harness connectors No. 1 and No. 2.
    Fig 2: Checking Injector Driver Circuits (Turbo) "B"
    G55912
  5. If there is continuity, replace SMEC for a defective power board. Before replacing SMEC, ensure terminal in 14-pin connector cavity No. 9 is not damaged causing a poor connection. If there is no continuity, repair White wire to cavity No. 9 for an open circuit to injector harness connector.
  6. With ignition off and 14-pin connector disconnected from SMEC, connect ohmmeter to 14-pin connector cavity No. 10 and ground. If there is continuity, repair Tan wire to connector cavity No. 10 for a short to ground. If there is no continuity, connect ohmmeter to 14 pin connector cavity No. 10 and Tan wire of injector connectors No. 3 and No. 4.
    Fig 3: Checking Injector Driver Circuits (Turbo) "C"
    G55913
  7. If there is continuity, replace SMEC for a defective power board. Before replacing SMEC, ensure terminal in 14-pin connector cavity No. 10 is not damaged causing a poor connection. If there is no continuity, repair Tan wire to cavity No. 10 for an open circuit to injector harness connector.
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