Engine Identification (ID) Codes
Engine ID codes are issued at beginning of KOER SELF-TEST. Codes are one-digit numbers represented by number of pulses displayed. (Схема №1) Engine ID code is equal to one-half the number of engine cylinders. For example, 2 pulses would indicate that engine is a 4-cylinder. ID code is used to verify proper PCM is installed and that SELF-TEST has been entered.
Description
Following procedures are functional tests of EEC-IV system. These 5 basic test steps must be followed in sequence to avoid misdiagnosis
- Visual Check
- Equipment Hookup
- KOEO (Key On Engine Off) SELF-TEST
- KOER (Key On Engine Running) SELF-TEST
- Continuous Monitor Mode (Wiggle Test)
Hardware Limited Operational Strategy (HLOS)
If a number of system or sensor failures are present and PCM is not receiving enough information to operate, PCM will switch to HLOS mode. PCM will output fixed values to allow operation of vehicle. Driveability concerns will be present. PCM will not output diagnostic trouble codes in this mode.