Input Displays

Input displays are operated as defined under Selecting Test  . The ECM Inputs selection is to provide for testing of inputs to the ECM. The input status is shown on the display as HI or LO, the input cycle status is shown as 0 until the ECM sees that the input has cycled from LO to HI or HI to LO. After the ECM has seen the input cycle, the 0 will change to an X to indicate that the input being tested has cycled and has "passed" the input test. The following are a summary of each parameter for the ECM.

• EI70 - CRUISE BRAKE SWITCH
  
  When the brake is not applied and the cruise on/off switch is on, the cruise brake switch will supply 12 volts to the ECM. When the brake is depressed, this input goes from 12 volts to 0 volts. HI means that the brakes are not applied and that the ECM has 12 volts at the cruise brake switch input (cruise switch must be ON.) LO means that the brakes are applied and that the ECM has 0 volts at the input.
• EI71 - VCC BRAKE SWITCH
  
  When the brake is not applied the VCC brake switch allows 12 volts through the VCC solenoid to the ECM. When the brake is depressed, this input goes from 12 volts to 0 volts. HI means that the brakes are not applied and that the ECM has 12 volts at the VCC brake switch input . LO means that the brakes are applied and that the ECM has 0 volts at this input.
• EI72 - THROTTLE
  
  The ISC throttle switch in the ISC motor is supplied with a 5 volt reference signal from the ECM to the ISC motor throttle switch terminal. When the throttle is closed, the throttle linkage is resting on the ISC plunger, the ISC throttle switch shorts the throttle switch input to ground, ECM throttle switch input is 0 volts. When the throttle is open, the throttle switch is open and the ECM throttle switch input is 5 volts. HI means that the throttle is open and the ECM has about 5 volts at the throttle switch input. LO means that the throttle is closed and the ECM has 0 volts at the throttle switch input.
• EI74 - PARK/NEUT
  
  The park/neutral switch is a normally open pair of contacts in the transmission gear selector switch that are closed in park or neutral shorting the park/neutral signal to ground. The ECM supplies a 12 volt reference to the park neutral contacts. When the gear selector is in park or neutral, the ECM park neutral input is 0-volts. When the gear selector is in any other gear range, the ECM park/neutral input is 12 volts. HI means the transmission is not in park or neutral and that the ECM has about 12 volts at the park/neutral input. LO means the transmission is in park or neutral and that the ECM has 0 volts at the park/neutral input.
• EI79 - SECOND GEAR
  
  The second gear switch is a normally closed switch in the transmission that opens when second gear oil is applied with sufficient pressure to allow downshifts (second gear oil is available to the switch when the transmission is in second, third, or fourth gear). The second gear switch grounds the second gear input when the transmission is in first gear or when the transmission is in second, third, or fourth with low oil pressure (0 volts at the ECM). HI means that second gear oil is available with sufficient pressure to allow downshifts without slippage and that the switch is open. LO means that the transmission is in first gear or the transmission is in second, third, or fourth with low oil pressure and the switch is closed.
• EI82 - CRUISE ENABLE
  
  The cruise control on/off switch is located on the right hand switch pod and controls the cruise control system. With the switch in the OFF position, there will be no voltage at the ECM input and cruise control will not be allowed. With the switch in the ON position 12 volts appear at the enable input and cruise control will be allowed to engage. HI means that the on/off switch is ON and the ECM has 12 volts at the cruise enable input. LO means that the on/off switch is off and the ECM has 0 volts at the cruise control input.
• EI83 - CRUISE SET/COAST
  
  The cruise set/coast switch is a normally open switch located on the steering wheel. When pushed, the switch puts 12 volts on the set/coast input and the ECM will engage the cruise control system. The cruise switch must be ON to perform this test. HI means that the set/coast button is closed (pushed) and the ECM has 12 volts on the set/coast input. LO means that the set/coast button is open (not pushed) and the ECM has 0 volts on the set/coast input.
• EI84 - CRUISE RESUME/ACCEL
  
  The cruise resume/accel switch is a normally open switch located on the steering wheel. When pushed, the switch puts 12 volts on the ECM resume/accel input and the ECM will engage the cruise control system. The cruise switch must be on to perform this test. HI means that the resume/accel button is closed (pushed) and the ECM has 12 volts on the resume/accel input. LO means that the resume/accel button is open (not pushed) and the ECM has 0 volts on the resume/accel input.