With Manufacturer's Scan Tool
QUICK TESTThe quick test is divided into 3 specialized tests:
1. key On Engine Off (KOEO) On-Demand Self-Test
2. Key On Engine Running (KOER) On-Demand Self-Test
3. 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 a diagnostic 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 will be displayed when no diagnostic trouble codes (DTCs) are output and a diagnostic tool communication error does not exist. System pass means that hardware monitored by the powertrain control module (PCM) is functioning within the normal operating limits. Only a system pass, a DTC, or an incomplete on-board diagnostic (OBD) drive cycle (P1000) will be displayed.
For applications that use a stand-alone transmission control module (TCM) the PCM will not output TCM DTCs. For TCM self-test and diagnostics, refer to Transmission Control Systems.
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 will carry out checks on certain sensor and actuator circuits. A fault 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 a diagnostic 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 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 fault 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 a diagnostic 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.
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.
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.
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. Refer to On Board Diagnostic (OBD) Drive Cycle for more information. When a fault is stored in memory, a DTC will be output on the data link when requested by the diagnostic tool. On-Board Diagnostic (OBD) Drive Cycle
There are two types of continuous DTCs. The first type is an emission-related code which will illuminate the malfunction indicator lamp (MIL) in the instrument cluster. The second is a non-emission related, non-MIL code which will not illuminate the cluster indicator.
For emission-related MIL codes, the PCM stores the DTC in continuous memory when a fault is detected for the first time. At this point the DTC does not illuminate the MIL and is now 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 fault is detected after the next ignition start-run cycle, the emission-related MIL code illuminates the MIL. The MIL remains on even if the fault is intermittent. The MIL is extinguished if the fault is not present through 3 consecutive drive cycles or if fixed the DTCs are cleared. Also, an emission-related pending MIL and any non-emission related, non-MIL DTCs are erased after approximately 40 vehicle warm-up cycles or if the DTCs are cleared.
Any diagnostic tool that meets OBD requirements can access the continuous memory to retrieve emission-related MIL DTCs. However, not all diagnostic tools access pending and non-emission related, non-MIL DTCs in the same way.
During most diagnostic procedures, it is required that all DTCs be retrieved and cleared. Consult the instruction manual from the tool manufacturer for specific instructions.