Fuel Injection (CIS-E)
CIS-E 5 Control Unit Input-Output Chart:
CIS-E 5 Control Unit Terminal Designations:
The CIS-E 5 system precisely controls fuel injection quantity under varying operating conditions. The CIS-E 5 control module 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
^ Electronic ignition control module (EZL/AKR)
^ Air flow sensor position indicator
^ Throttle valve switch (idle and full load)
^ Electronic speedometer
^ Microswitch
^ Oxygen sensor
^ Intake air temperature sensor
^ Transmission range selector
^ Engine systems (MAS) control module
The electro-hydraulic actuator regulates pressure in the lower chambers of the CIS-E 5 fuel distributor which provides for the optimal fuel quantity. Furthermore, the CIS-E 5 control module provides output signals for operation of the:
^ The fuel pumps
^ Camshaft timing adjuster
^ Purge switchover valve
^ Idle control valve
^ Start valve
^ Transmission shift point delay
^ EGR switchover valve
^ Engine systems (MAS) control module
^ On-Off ratio output (Diagnostic Socket)
^ "Check Engine" warning lamp
^ Upshift delay switchover valve
Warm-up 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 3 - 5 mA (park or neutral), 5 - 8 mA (drive) 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 0 - 1 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.
COLD START VALVE OPERATION
The cold start valve is activated by the CIS-E 5 control module based on coolant temperature information. Activation of the cold start valve occurs according to a pre-programed map in the CIS-E control module and results in a pulsating injection of the cold start valve. Cold start injection does not occur above temperatures of 158°F.
Camshaft Timing Adjuster:
CAMSHAFT TIMING ADJUSTER
The intake camshaft of the 104 engine is equipped with an electro-magnetic camshaft adjuster. The CIS-E 5 control module specifically adjusts the intake camshaft for improved torque, volumetric efficiency, and driveability.
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.
IDLE SPEED CONTROL VALVE
When the ignition is switched to the run (ON) position and the engine is off the idle control valve is activated by a specific voltage from the CIS-E 5 control module which sets the valve opening, depending upon coolant temperature. After the engine is running the nominal engine speed is maintained between 600 RPM and 750 RPM depending upon inputs to the CIS-E 5 control module. Should there be an open or short circuit of the idle speed control valve circuit, or an interruption in the data exchange circuit between the CIS-E 5 and EZL/AKR ignition control modules, the power to the idle speed control valve is shut off. The ignition timing is also retarded to the extent that the idle speed increases only slightly.
HEATED O2 SENSOR
The CIS-E 5 control module controls O2-sensor heater operation via the engine systems (MAS) control module. The MAS control module sends information regarding the O2-sensor heater current via the data exchange signal to the CIS-E 5 control module for on-board diagnostics.
AIR INJECTION REACTOR CONTROL
The electromagnetic clutch of the air injection reactor system pump is controlled by a coolant temperature dependent signal from the CIS-E 5 control module through the engine systems (MAS) control module. The diagnostics of the CIS-E 5 control module checks the function of the entire system. The air pump is operated after each start for 5 seconds if the vehicle is stationary, the engine at operating temperature and at idle, and lambda control is operating. By means of the O2-sensor signal, it can be determined whether the air injection reactor system is in operation. If a fault is recognized, it is stored in the on-board diagnostics of the CIS-E 5 control module.
EXHAUST GAS RECIRCULATION
The CIS-E 5 control module actuates the EGR switchover valve. Coolant temperature, air flow sensor position indicator, and throttle valve input are determining factors for CIS-E 5 control of the EGR system. Futhermore, the diagnostics of the CIS-E 5 control module tests the function of the EGR system. During deceleration fuel cutoff the EGR switchover valve is actuated for 1.5 seconds. From the intake vacuum signal, which is measured by the ignition control module, it can be determined whether the EGR system is functioning. If a fault is recognized, it is stored in the fault memory of the CIS-E 5 control module.
DIAGNOSIS AND TESTING
The CIS-E 5 control module can recognize and indicate malfunctions that have occurred in three different manners.
A. ON-BOARD DIAGNOSTIC CONNECTOR
While the engine is running, malfunctions that are encountered and recognized, such as, short circuits and implausible values are stored in the CIS-E 5 control module. Faults due to intermittent contacts are also recognized and stored as malfunctions. The stored faults can be extracted by use of the push-button and LED" or an impulse counter at the on-board diagnostic connector. The battery or the CIS-E 5 control module must not be disconnected before code extraction is completed or faults will be erased. On California models the "CHECK ENGINE" light in the instrument panel will illuminate if a fault is recognized in the emission control system. On Federal models the "CHECK ENGINE" light will illuminate only if there is a fault in the oxygen sensor circuit. Refer to DIAGNOSIS AND TESTING PROCEDURES.
B. ON-OFF RATIO WITH IGNITION ON
With the ignition switched (on), the input signals to the CIS-E 5 control module are tested with the components in a static condition. Stored faults are not indicated by this test. Only faults that are present in the system at the time of testing can be detected. This mode can be used for a quick test of the signals that are monitored. Refer to DIAGNOSIS AND TESTING PROCEDURES.
C. ON-OFF RATIO WITH ENGINE RUNNING
This test is to be conducted with the engine at normal operating temperatures an running. Signals to and from the control module are tested in a dynamic state. An on-off ratio that is not oscillating (fixed) indicates a system malfunction. Refer to DIAGNOSIS AND TESTING PROCEDURES.