Quick Test Description
QUICK TEST DESCRIPTIONNOTE: Verify the power take-off (PTO) system or auxiliary idle control (if equipped) is off when trying to carry out the self-tests.
The Quick Test is carried out by retrieving the key ON engine OFF (KOEO), key ON engine running (KOER), and continuous memory diagnostic trouble codes (DTCs).
Quick Test is divided into 5 specialized tests:
(1) Retrieve/Clear Continuous DTCs
(2) KOEO On-Demand Self-Test
(3) KOEO Injector Electrical Self-Test
(4) KOER On-Demand Self-Test
(5) KOER Glow Plug Monitoring Self-Test
All are described below.
The Quick Test checks the integrity and function of the powertrain control module (PCM) and outputs the test results upon demand. The Quick Test also provides a quick end check of the powertrain control system and is usually carried out at the start of each diagnostic procedure. It is also carried out at the end of the pinpoint tests for verification of repair and to make sure no other concerns were incurred while repairing a previous concern.
Retrieve/Clear Continuous Diagnostic Trouble Codes (DTCs)
Retrieve/clear continuous DTCs is a functional test of the PCM. DTCs can be retrieved or cleared with the key on and the engine off or running. Unlike the KOEO and KOER self-tests, which can only be activated on demand, the continuous monitor is always active in monitoring the system. When a concern is detected, a DTC is stored in memory to be retrieved at a later date, making it possible to diagnose intermittent concerns. DTC P1000 may be the only DTC displayed, indicating an incomplete on board diagnostic (OBD) drive cycle (more drive time needed).
Quick Test
For all concerns, refer to the Symptom Charts in No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index. The Quick Test is carried out by retrieving KOEO, KOER, and continuous memory DTCs. If a DTC is retrieved, you must then go to the appropriate pinpoint test. If unable to complete the self-test, GO to Pinpoint Test AE. No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index Tests AE: Unable To Activate Self-Test/Network Communication Error
Key On Engine Off (KOEO) On-Demand Self-Test
The KOEO on-demand self-test is an on-demand functional test of the PCM carried out with the key ON and the engine OFF. This test checks that all inputs and outputs (circuits, sensors, regulators, relays, and solenoids) connected to the PCM are electrically operating without a concern.
Key On Engine Off (KOEO) Injector Electrical Self-Test
NOTE: If no DTCs are present refer to Performance Diagnostic Procedures and carry out the Power Balance test 8. 8. Power Balance Test
The KOEO injector electrical self-test is an on-demand functional test of the PCM carried out with the key ON and the engine OFF. This test determines if the injectors and circuits are correctly operating. If a concern is detected by the PCM, the corresponding DTCs are displayed at the end of the self-test.
- Turn off all accessories. If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out self-tests.
- Carry out the necessary vehicle preparation and a visual inspection. Refer to Quick Test Operation.
- Refer to the scan tool operating manual for instructions.
- Key ON, engine OFF.
- Carry out the KOEO Injector Electrical Self-Test.
- Key in OFF position.
- Record the DTCs and carry out the appropriate pinpoint test.
Key On Engine Running (KOER) On-Demand Self-Test
The KOER on-demand self-test is an on-demand functional test of the PCM carried out with the engine running. The temperature must be above 60°C (140°F) for KOER to operate. A check is made on the fuel rail pressure (FRP) sensor, variable turbocharger geometry, and exhaust gas recirculation (EGR) systems. During this test, the engine RPM may vary. The brake pedal position test is a part of the KOER on-demand self-test and must be carried out during this operation. A concern must be present at the time of testing for the KOER on demand self-test to detect a concern. If a concern is detected, a DTC is output on the data link at the end of the test when requested by the scan tool.
Brake Pedal Position (BPP) Test
The BPP test checks the ability of the electronic engine control (EEC) system to detect a change of state in the BPP switch. The brake pedal is briefly applied and released. This is done during a KOER on-demand self test.
Key On Engine Running (KOER) Glow Plug Monitoring Self-Test
NOTE: When running this self-test, the battery voltage must not decrease to less than 10 volts or exceed 14 volts. Make sure that the batteries are OK and the charging system is working correctly. If necessary, apply the accelerator pedal to maintain system voltage.
The KOER glow plug monitoring self-test is an on-demand functional test of the glow plug system carried out with the engine running and the A/C off. Maintain battery voltage at 10-14 volts during this test. If necessary, apply the accelerator pedal to increase voltage to the specified level. The PCM activates the glow plug control module (GPCM) and monitors the glow plug circuits. A concern must be present at the time of testing for the test to detect a concern. DTCs are sent to the PCM on the diagnostic line and then output to the scan tool.
Malfunction Indicator Lamp (MIL) DTCs
MIL DTCs are generated to alert the driver that there is a concern with the system or the vehicle is in failure management effects mode (FMEM). MIL DTCs are also used to indicate an emission concern. Non-MIL DTCs indicate a less serious or non-emission related concern with the system.