Quick Test Description

QUICK TEST DESCRIPTION

Quick Test
The 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 the hybrid-electric system. The results of the quick test are requested and displayed on the scan tool. The quick test also provides a quick end check of both the powertrain control system and the hybrid-electric system. It 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 faults were incurred while repairing a previous fault. A system pass is displayed when no diagnostic trouble codes (DTCs) are output and a scan tool communication error does not exist. System pass means that hardware monitored by the powertrain control module (PCM) or the transaxle control module (TCM) 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.

NOTE:
- Do not carry out consecutive quick tests without turning the key to OFF position for a minimum of 15 seconds.
- Some faults within the hybrid-electric system may prevent the TCM from executing the KOEO on-demand self-test. When one or more of the following DTCs are stored in the TCM continuous memory the KOEO on-demand self-test is not executed: P0613, P0A90, P0A1B, P0A1A, P2806, P0A0A, and U0294.

Key On Engine Off (KOEO) On-Demand Self-Test
The KOEO on-demand self-test is a functional test of the PCM or the TCM, and is carried out on demand with the key in the ON position and the engine OFF. This test carries out checks on certain input and output circuits. A fault must be present at the time of testing for the KOEO self-test to detect the fault. When a fault is detected, a DTC is output on the data link at the end of the test when requested by a scan tool. The KOEO on-demand self-test can be executed with the gear selector in PARK only.

Key On Engine Running (KOER) On-Demand Self-Test
The KOER on-demand self-test is a functional test of the PCM, and is carried out on-demand with the key in the START position, the engine running and the vehicle stopped. A check of certain inputs and outputs is made during operating conditions and at a normal temperature. The brake pedal position (BPP) test is a part of the KOER on-demand self-test and must be carried out during this operation. A fault must be present at the time of testing for the KOER on-demand self-test to detect the fault. When a fault is detected, a DTC is output on the data link at the end of the test when requested by a scan tool. The KOER on-demand self-test can be executed with the gear selector in PARK only.

Brake Pedal Position (BPP) Test
This tests the ability of the EEC system to detect a change of state in the BPP switch. The brake pedal must be briefly applied and released on all vehicles equipped with a BPP input. This is done during a KOER on-demand self-test.

Continuous Memory Self-Test

NOTE: In order to retrieve the DTCs, the scan tool communication protocol must be compatible with the vehicle communication protocol.

The continuous memory self-test is a functional test of the PCM or the TCM which is carried out under any condition (engine running or OFF) with the key in ON position. Unlike the KOEO and KOER on-demand self-tests, the continuous self-test is always active. A fault does not need to be present when retrieving continuous memory self-test DTCs, making the test valuable when diagnosing intermittent faults. The vehicle may need to be driven or the OBD drive cycle completed to allow the PCM or the TCM to detect a fault. Refer to On Board Diagnostic (OBD) Drive Cycle for more information. When a fault is stored in memory, a DTC is output on the data link at the end of the test when requested by a scan tool. On Board Diagnostic (OBD) Drive Cycle

There are 3 types of continuous DTCs:
- a an emission-related malfunction indicator lamp (MIL) code which illuminates the CHECK ENGINE indicator in the instrument cluster.
- a non-emission related, non-MIL code which does not illuminate the CHECK ENGINE indicator, but illuminates the powertrain malfunction indicator (wrench), HAZARD, or both indicators.
- a non-emission, non-MIL code which does not illuminate any indicators.

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 1 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, the DTC that illuminates the MIL is cleared, or the keep alive memory (KAM) is reset. Also, an emission-related pending MIL and non-emission related (non-MIL) DTCs are erased after approximately 40 vehicle warm up cycles, a KAM reset, or when the DTCs are cleared.

Any scan tool that meets OBD requirements can access the continuous memory to retrieve emission-related MIL DTCs. However, not all scan tools access pending and non-emission related (non-MIL) DTCs in the same way.

During most diagnostic procedures in this manual, it is required that all DTCs be retrieved and cleared. Consult the instruction manual from the tool manufacturer for specific instructions.