Description
Following procedures are functional tests of EEC-V system. These basic test steps must be followed in sequence to avoid misdiagnosis.
- Visual Check
- Equipment Hookup
- «KOEO SELF-TEST»(ref-23761-S01078547972001010300000) (Key On Engine Off)
- «KOER SELF-TEST»(ref-23761-S38248441082001010300000) (Key On Engine Running)
- Computed Timing Check
- Continuous Memory Self-Test
GENERIC OBD-II PARAMETER IDENTIFICATION (PID)
Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps
- Select vehicle and engine selection menu (optional). see scheme 3
- Select year, engine, model and any additional information requested by scan tester (optional).
- Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
- Select PID/DATA MONITOR.
- Turn ignition on or start engine and allow to idle.
- Follow operating instructions from scan tester menu.
- Select PIDs and press START.
NON-GENERIC OBD-II PARAMETER IDENTIFICATION (PID)
Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps
- Select vehicle and engine selection menu. see scheme 3
- Select year, engine, model and any additional information requested by scan tester.
- Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
- Select DIAGNOSTIC DATA LINK.
- Select PCM - POWERTRAIN CTRL MODULE.
- Select DIAGNOSTIC TEST MODES.
- Select PID DATA MONITOR AND RECORD.
- Turn ignition on or start engine and allow to idle.
- Follow operating instructions from scan tester menu.
- Select PIDs and press START.
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.
OBD-II Sensor Illustration Description
The OBD II monitors described in this section provide a general description of each monitor. In these descriptions, the monitor strategy, hardware, testing requirements and methods are tied together to provide an overall understanding of each monitor operation. An illustration for each monitor is also provided to aid in the description. These illustrations should be used as typical examples and are not intended to represent all the possible configurations.
Each illustration depicts the Powertrain Control Module (PCM) as the main focus with the primary inputs and outputs for each monitor. The icons to the left of the PCM represent the inputs used by each of the monitor strategies to enable or activate the monitor. (Scheme 532) The components and subsystems to the right of the PCM represent the hardware and signals used while performing the tests and the systems being tested. The Comprehensive Component Monitor (CCM) illustration has numerous components and signals involved and is shown generically. see scheme 6 Refer to the illustrations, match the numbers to the corresponding numbers in the monitor descriptions for a better comprehension of the monitor and associated Diagnostic Trouble Codes (DTCs).
These monitor descriptions are intended as general information only. See OBD-II DRIVE CYCLE TEST PROCEDURE for detailed testing instructions for each monitor.
