Federal Models

System Operation Diagram:

CIS-E Control Unit Pin Designations:

The CIS-E (Continuous Injection System / Electric) system precisely controls fuel injection quantity under varying operating conditions. The CIS-E control unit evaluates information provided by various sensors concerning engine operating conditions, and from the information received generates a control signal for the electro-hydraulic actuator. Input signals include:

^ Overvoltage protection relay B+
^ Coolant temperature sensor
^ EGR temperature sensor (California Only)
^ Electronic ignition control unit (EZL)
^ Air flow sensor position indicator
^ Throttle valve switch (idle and full load)
^ Microswitch
^ Oxygen sensor
^ Transmission range selector
^ Vehicle speed sensor

The electro-hydraulic actuator regulates pressure in the lower chambers of the CIS-E fuel distributor which provides for the optimal fuel quantity. Furthermore, the CIS-E control unit provides output signals for operation of the:

^ The fuel pump
^ Idle control valve
^ Transmission shift point delay
^ On-Off ratio output (Diagnostic Socket)
^ "Check Engine" warning lamp
^ Upshift delay switchover valve

Warm-up Enrichment Chart:

AFTER-START AND WARM-UP ENRICHMENT (ELECTRO-HYDRAULIC ACTUATOR CONTROL)

With the throttle valve switch closed and engine temperatures below 68°F the after-start enrichment current to the electro-hydraulic actuator is 7 - 13 mA for a maximum of 8 seconds (increased current to electro-hydraulic actuator equals more fuel at the injectors). This provides for good initial start-up. If the engine temperature remains below 68°F the current will then drop to a warm-up constant of 1 - 5 mA and will remain fixed for a maximum of 2 minutes. Oxygen sensor control begins when the after-start enrichment has been canceled and the engine coolant temperature has reached 122°F. Oxygen sensor control will then continue until the next start-up cycle is repeated.

Transmission Up-shift Delay Diagram:

TRANSMISSION UP-SHIFT DELAY

In order to have the catalytic converter reach its operating temperature more quickly during the warm-up phase, the automatic transmission 2nd - 3rd light throttle upshift point is raised at coolant temperatures below approx. 104°F. The upshift occurs at a higher vehicle speed, thus engine temperatures rise more rapidly.

ON-BOARD DIAGNOSTICS

While the engine is running, malfunctions that are encountered and recognized, such as short circuits and implausible values are stored in the CIS-E control unit. Faults due to intermittent contacts are also recognized and stored as malfunctions. The stored faults can be extracted by use of an impulse counter at the on-board diagnostic connector. The battery or the CIS-E control unit must not be disconnected before code extraction is completed or faults will be erased. On Federal models the "CHECK ENGINE" light in the instrument panel will illuminate if a fault is recognized in the oxygen sensor circuit.