Tribute 4WD L4-2.5L Hybrid (2009)
Engine Control Module: Scan Tool Testing and Procedures
Quick Test Description
QUICK TEST
Quick Test Description
The quick test is divided into 3 specialized tests:
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Key On Engine Off (KOEO) On-Demand Self-Test
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Key On Engine Running (KOER) On-Demand Self-Test
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Continuous Memory Self-Test The quick test checks the integrity and function of the electronic engine control (EEC) system and outputs the test
results when requested by the scan tool. The quick test also provides a quick check of the powertrain control system, and is usually carried out at
the start of each diagnostic procedure with all accessories off. The quick test is also carried out at the end of most pinpoint tests for verification of
the repair and to make sure no other concerns are incurred while repairing a previous concern. A system pass is displayed when no DTCs are
output and a scan tool communication error does not exist. System pass means that hardware monitored by the PCM is functioning within the
normal operating limits. Only a system pass, a DTC, or an incomplete on board diagnostic (OBD) drive cycle (P1000) is displayed.For
applications that use a stand-alone transmission control module (TCM) the PCM does not output TCM DTCs.
Key On Engine Off (KOEO) On-Demand Self-Test
The KOEO on-demand self-test is a functional test of the PCM carried out on-demand with the key on and the engine off. This test carries out checks on
certain sensor and actuator circuits. A concern must be present at the time of testing for the KOEO self-test to detect the concern. When a concern is
detected, a DTC is output on the data link at the end of the test as requested by the scan tool.
Key On Engine Running (KOER) On-Demand Self-Test
The KOER on-demand self-test is a functional test of the PCM carried out on-demand with the key on, the engine running and the vehicle stopped. A
check of certain inputs and outputs is made during operating conditions and at a normal operating temperature. The brake pedal position, transmission
control, and the power steering tests are part of the KOER on-demand self-test and must be carried out during this operation if applicable. These are
described below. A concern must be present at the time of testing for the KOER on-demand self-test to detect the concern. When a concern is detected, a
DTC is output on the data link at the end of the test as requested by the scan tool.
Brake Pedal Position (BPP) Test
The BPP test checks the ability of the EEC system to detect a change of state in the BPP switch. The brake pedal is briefly applied and released on all
vehicles equipped with a BPP input. This is done during a KOER on-demand self-test.
Power Steering Pressure (PSP) Test
The PSP test checks the ability of the EEC system to detect a change in the power steering system fluid pressure. The steering wheel is briefly turned at
least 1/4 of a revolution on vehicles equipped with a PSP switch or sensor. This is done during a KOER on-demand self-test.
Transmission Control Switch (TCS) Test
The TCS test checks the ability of the EEC system to detect a change of state in the TCS. The switch is briefly cycled on all vehicles equipped with a
TCS input. This is done during a KOER on-demand self-test.
Continuous Memory Self-Test
The continuous memory self-test is a functional test of the PCM carried out under any condition (engine running or off) with the key on. Unlike the
KOEO and KOER self-tests, which can only be activated on-demand, the continuous self-test is always active. A concern does not need to be present
when accessing continuous memory self-test DTCs, making the test valuable when diagnosing intermittent concerns. The vehicle may need to be driven
or the on board diagnostic (OBD) drive cycle completed to allow the PCM to detect a concern. See See: Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes/On Board Diagnostic (OBD) Drive Cycle for more information. When a concern is stored in memory, a DTC is output on
the data link when requested by the scan tool.
There are 2 types of continuous DTCs. The first type is an emission-related code which illuminates the malfunction indicator lamp (MIL) in the
instrument cluster. The second is a non-emission related, non-MIL code which does not illuminate the cluster indicator.
For emission-related MIL DTCs, the PCM stores the DTC in continuous memory when a concern is detected for the first time. At this point the DTC
does not illuminate the MIL and is considered a pending code. The purpose of pending codes is to assist in repair verification by reporting a pending
DTC after one drive cycle. If the same concern is detected after the next drive cycle, the emission-related MIL code illuminates the MIL and sets both a
confirmed MIL DTC and a permanent DTC. The MIL remains illuminated even if the concern is intermittent. A permanent DTC is stored until three
consecutive passing drive cycles have been completed after a repair and the MIL turns off, or after a request to clear DTCs has been made using the scan
