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Home >> Isuzu >> 1991 >> Rodeo LS, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.6L EFI >> Trouble Code Identification >> Code 33 - Fuel Injector Circuit (Open Or Grounded) >> Diagnostic Aid
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Diagnostic Aid

  1. Check circuit 21 with key ON, engine stopped. Measure the voltage between terminal 75 and battery (-) at Dropping Resistor connector. See Fig 2 . Voltage should be more than 8 volts.
  2. Measure the voltage difference between battery (+) and each injector at Dropping Resistor connector. Voltage should be almost zero volts.
  3. Measure the voltage difference between battery (-) and each injector at Dropping Resistor connector. Voltage should be more than 8 volts.
  4. With key OFF, disconnect all ECM connectors. Then with key ON, measure the voltage between battery (+) and injector terminals.
  5. Measure the voltage of injector terminals No. 1 and 2 at ECM connector (10 pin).
Fig 1: Code No. 33 Schematic, Fuel Injector Circuit
G91I17085Courtesy of ISUZU MOTOR CO.
Fig 2: Code No. 33 Connector, Fuel Injector Circuit
G91J17086Courtesy of ISUZU MOTOR CO.
Fig 3: Code No. 33 Flow Chart, Fuel Injector Circuit
G91A17087Courtesy of ISUZU MOTOR CO.
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