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NS11 - Checking Injector Control Circuits

  1. Connect DRB II to engine harness connector. Put system in Diagnostic Test Mode. Disconnect fuel injector connector. Connect analog voltmeter to Dark Green/Black and White wire terminals in injector harness connector. Select lowest voltage scale available on voltmeter (4-volt scale is recommended). Put system in ATM Test "02".
    Fig 1: Checking Injector Control Circuits "A"
    G55914
  2. If voltmeter reading is not pulsating, go to step 3). If voltmeter reading is pulsating between zero and one volt, go to step 5). If voltmeter is showing negative voltage, reverse leads at injector connector and repeat test.
  3. Connect voltmeter to injector harness connector Dark Green/Black wire and ground. If voltmeter reads battery voltage, go to next step. If voltmeter reading is zero volts, repair Dark Green/Black wire of injector harness connector for an open circuit to wiring harness splice.
    Fig 2: Checking Injector Control Circuits "B"
    G55915
  4. Turn ignition off. Disconnect 14-pin connector from SMEC. Connect ohmmeter to 14-pin connector cavity No. 9 and White wire of injector harness connector. If there is no continuity, repair White wire to 14-pin connector cavity No. 9 for an open circuit to injector connector. 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.
    Fig 3: Checking Injector Control Circuits "C"
    G55916
  5. Reconnect fuel injector connector. Remove screw and lift cap from injector. Connect analog voltmeter between terminals of injector cap. Select lowest scale available on voltmeter (4-volt scale is recommended). Put system in ATM Test "02".
    Fig 4: Checking Injector Control Circuits "D"
    G55917
  6. If voltmeter reading is pulsating between zero and one volt, replace fuel injector. Before replacing injector, ensure terminals in injector cap are not damaged causing a poor connection. If voltmeter is showing a negative reading, reverse leads at injector connector and repeat test.
  7. If voltmeter reading is not pulsating, replace fuel injector cap and wiring harness assembly. Before replacing injector cap and wiring harness assembly, ensure terminals in injector cap are not damaged causing a poor connection.
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