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digital signal that will measure 1-4 volts w/DVOMĬonnector Checks to Ground (B-) (Check with breakout box installed, ignition key should be in the OFF position) Test Points 12 volts indicates an open in the PCM or breakout box
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5v indicates an open between the PCM and the IDM. Key ON Engine Off - Voltage Checks (Check with breakout box installed with ignition key "ON" engine off) Test Points NOTE: IDM diagnostic fault codes will not be transmitted if the EF line is not functioning, however, the engine will operate normally. The WARN lamp will be illuminated if this is detected. NOTE: The engine will not operate without a functioning FDCS circuit.Īctive faults can be detected by a toggle sequence that the PCM looks for on start up. NOTE: The engine will not operate without a functioning CI circuit.Īctive faults can be detected by an on demand output circuit check performed during engine off tests. Active faults can be detected by an on demand output circuit check performed during engine off tests. Intermittent open or short to ground conditions can be detected by the IDM through IDM stuck high or low codes (1218 & 1219). The EF signal is generated by the IDM by "pulling down" (switching to gnd) a 12 volt communications circuit in the PCM. In an engine off or engine running diagnostic mode, the EF signal is also used to communicate diagnostic information from the IDM to the PCM. Signal) is generated when the key is first turned "ON" and before the engine starts, communicates to the PCM that the IDM is powered up. Extensions of the EF (Electronic Feedback) signal can indicate to the PCM possible problems with the injectors by the IDM as the engine is running. Injector Driver Module Feedback signal is a 0 to 12 volt wave form signal that communicates from the IDM to the PCM a mirror image of the FDCS signal. The FDCS signal is generated by the PCM by "pulling down" (switching to ground) a volt communication circuit in the IDM. The timing and duration of the signal is determined by the PCM calibration and the signals of various sensor inputs.
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The CI signal is generated by the PCM by "pulling down" (switching to grd.) a 12 volt communication circuit in the IDM.įuel Demand Command signal is a 0 to 12 volt wave form signal that communicates from the PCM to the IDM the required engine timing and duration of injector firing. This signal is calculated from the signal generated from the Camshaft Position Sensor (CMP). This signal is used by IDM to synchronize the injector firing sequence. Cylinder Identification (CI) signal is a 0 to 12 volt wave form signal that communicates from the PCM to the IDM the position of cylinders 1 & 4.
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