Entering PCM Output Overrides

1. With ".7.0" displayed on FDC (to cause ".7.0" to be displayed on FDC, see INTRODUCTION TO DIAGNOSTIC TESTING), depress HI button on ECCP and display will change from ".7.0" to "E.9.5". Simultaneously depress ECON and WARMER button on ECCP and display will advance from "E.9.5" to "E.5.0", signaling beginning of output override cycle.
2. To advance display to higher numbered override, depress HI button on ECCP. If test conditions are not appropriate for performing test, ECCP will display "8.8.8." until test conditions are corrected or test is by-passed. To return to a lower numbered output override, depress LO button on ECCP.
3. Following is a descriptive list of available overrides:
   • "E.5.0"  - No override.
   • "E.5.1" Viscous Converter Clutch (VCC) Override  - Upon selecting this mode, PCM controls VCC at normal operating parameters. Technician can initiate an override by pushing WARMER button on ECCP to switch on VCC solenoid or by pushing COOLER button on ECCP to turn off VCC solenoid. Override continues only while button is depressed.
     NOTE: EGR test will have little significance with engine at idle because a positive backpressure type of EGR valve is used.
   • "E.5.2" EGR Override  - While in this mode, PCM displays amount of EGR flow on a scale of "00" (no flow) to "99" (full flow). If WARMER button on ECCP is depressed, EGR is commanded on until button is released. If COOLER button on ECCP is depressed, EGR is commanded off until button is released. PCM controls EGR at normal operating parameters when no button is depressed.
   • "E.5.3" ISC Override  - While in this mode, Idle Speed Control (ISC) motor can be commanded and held to a fully retracted position by using ECCP COOLER and WARMER buttons. Vehicle must be standing still with transmission in Park or Neutral. Depressing COOLER button on ECCP causes ISC to retract and remain in this position while button is depressed; FDC will display "00". Depressing WARMER button on ECCP causes ISC motor to extend until throttle switch closes. ECCP will display "99". When throttle switch closes, normal control of ISC is restored.
     NOTE: During test "E.5.4", A/C compressor clutch and EGR are commanded off and spark advance is fixed.
   • "E.5.4" Injectors 1-8 Override  - While in this mode, each of 8 fuel injectors can be individually selected and turned off using ECCP WARMER and COOLER buttons. Transmission must be in Park or Neutral. Depressing WARMER button on ECCP selects injector number to be tested. With WARMER button depressed and held down, injector number will increase at a rate of one per second and be displayed on FDC. Depressing COOLER button on ECCP turns off selected injector and "00" is displayed on FDC. Selected injector will remain off while COOLER button remains depressed.
   • "E.5.5" Fuel Pump Relay Override  - While in this mode, fuel pump relay is commanded off using ECCP COOLER button. Transmission must be in Park or Neutral. Depressing and holding COOLER button on ECCP causes FDC to display "00", indicating fuel pump relay has been de-energized. Releasing COOLER button causes "99" to be displayed; normal control of fuel pump relay is resumed.
     NOTE: To ensure sufficient vacuum is available to operate cruise control servo, engine should be run and then turned off immediately before using cruise control override. Cruise override test cannot be performed with engine running.
   • "E.5.7" Cruise Servo Feedback Override  - While in this mode, cruise control servo position can be changed using ECCP WARMER and COOLER buttons. Depressing WARMER button on ECCP retracts cruise servo and increases commanded servo position one percent at a time to a maximum of 100 percent. Depressing COOLER button on ECCP will command a decrease in servo position and extend cruise servo one percent at a time to a minimum of zero percent. FDC will display current commanded cruise control servo position as percent.
   • "E.5.8" Coolant Fans Override  - While in this mode, COOLER button on ECCP is depressed to invert state of low speed fan relay. "00" is displayed on FDC with fans not running. With fans running at low speed and low speed relay energized, FDC displays "10". Depressing WARMER button on ECCP will invert high speed fans operation. With fans running at high speed, "11" will be displayed on FDC, indicating high and low speed fan relays are energized.
   • "E.5.9" Fixed Spark Override  - While in this mode, spark advance is controlled manually and displayed on FDC in degrees. First time COOLER button on FDC panel is depressed and released, spark angle is fixed at 10° BTDC. Second and subsequent times COOLER button is depressed, spark timing is retarded 1-2 degrees until 0° TDC is reached. Each time WARMER button on ECCP is depressed, spark is advanced 1-2 degrees until PCM-controlled spark advance present when override was initiated is again reached. Spark advance cannot be advanced beyond original setting and attempt to do so will cause FDC to display "8.8.8.".
   • "E.6.0" Injector Flow Override  - While in this mode, each fuel injector can be individually selected and energized once per engine run cycle. Injector to be tested is selected by depressing and holding COOLER button on ECCP. FDC will display injector number, which will increase at a rate of one per second.

Depressing WARMER button on ECCP energizes displayed injector for 500 milliseconds. Each injector can be energized only once per engine cycle to avoid possible engine flooding. "8.8.8." will be displayed and override disabled if an attempt is made to energize an injector which has already been energized.

• "E.6.1" Transaxle Override  - While in this mode, transaxle can be downshifted by depressing COOLER button and upshifted by depressing WARMER button. Transaxle will not downshift from 2nd to 1st gear at speeds greater than 30 MPH or from 3rd to 2nd gear at speeds greater than 60 MPH.