Description
Quick test is made up of 7 functional tests of EEC-V system. These basic test steps must be followed in sequence to avoid misdiagnosis. All self-tests are completely menu driven using the New Generation Star (NGS) scan tool.
- Visual Check
- Vehicle Preparation & Equipment Hookup
- KOEO (Key On Engine Off) ON-DEMAND SELF-TEST
- KOER (Key On Engine Running) ON-DEMAND SELF-TEST
- Continuous Memory Self-Test
- KOEO (Key On Engine Off) Injector Electrical Self-Test
- KOER (Key On Engine Running) Switch Self-Test
- KOER (Key On Engine Running) Cylinder Contribution Self-Test
- KOER (Key On Engine Running) Glow Plug Monitoring Self-Test
KOEO on-demand self-test is a functional test of PCM performed with ignition key on, engine off. This test checks if PCM inputs and outputs are functioning electronically without any faults. A fault must be present at time of testing for KOEO ON-DEMAND SELF-TEST to detect a fault.
KOER ON-DEMAND SELF-TEST is a functional test of PCM performed with ignition key on, engine running. A check is made on Injection Control Pressure (ICP) and Exhaust Back Pressure (EBP) systems. During this test, engine RPM will increase, PCM will command ICP high then low, then command EBP high and low. A fault must be present at time of testing for KOER ON-DEMAND SELF-TEST to detect a fault.
Continuous memory self-test is a functional test of PCM. DTCs can be retrieved or cleared with ignition on, engine off or with engine running. Unlike KOEO and KOER self-tests, which can only be activated on demand, continuous monitor is always active in monitoring the system. When a fault is detected, DTC will be stored in memory. This makes it possible to diagnose intermittent faults.
Injector self-test is a functional test of PCM performed with ignition key on, engine off. This test determines if injector circuits and solenoids are electrically operating without fault. All injectors will buzz together for about 2 seconds, then each individual injector will buzz for about one second in numerical order.
KOER switch self-test is a functional test of PCM performed with ignition key on, engine running. This test will set a DTC if test does not detect a transition on one or more switches. After pressing trigger to start self-test, wait 5 seconds before running through driver operated controls to eliminate chance of setting a false DTC. Accelerator pedal must first be depressed and released to begin test, then parking brake, speed control on, off, set, resume, coast, transmission control or clutch. Depress and release brake pedal last, which will test both the Brake Pressure Applied (BPA) switch and Brake On/Off (BOO) switch.
This test determines if all engine cylinders are contributing equally to engine performance. PCM checks cylinders in numerical order. A fault must be present at time of testing to detect a fault.
This test activates glow plug relay and monitors glow plug relay circuits. A fault must be present at time of testing to detect a fault.
PARAMETER IDENTIFICATION (PID)
PID mode allows access to certain data values, analog and digital inputs and outputs, calculated values, and system status information. To access PID mode, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps
- Select VEHICLE & ENGINE SELECTION menu.
- Select NEW VEHICLE, YEAR & MODEL.
- Select DIAGNOSTIC DATA LINK.
- Select PCM - POWERTRAIN CONTROL MODULE.
- Select PID/DATA MONITOR & RECORD.
- Turn ignition on or start engine and allow to idle.
- Follow operating instructions from scan tool menu.
- Select PIDs and press START to begin monitoring. If PID value is not as specified, perform CIRCUIT TEST.
Output state self-test allows a technician to energize and de-energize output actuators on command. After accessing OUTPUT STATE TEST MODE, outputs can be turned on and off separately. After pressing trigger to start self-test, accelerator pedal must be depressed then released to cycle outputs high on solenoids, IDM relay, wait to start light, Fuel Delivery Control Signal (FDCS), Electronic Feedback (EF) and Transmission Control Indicator Light (TCIL). Depress and release accelerator again to cycle outputs low. This self-test does not set any DTCs.
This mode allows access to emission related data values from specific generic PIDs. These values are immediately stored in continuous memory when an emission related fault occurs. This provides a snapshot of the conditions that were present when the fault occurred. Freeze frame will be stored until PCM memory is erased.
Primary function of drive cycle procedure is to clear DTC P1000 and to satisfy specifications for SAE J1979. Each OBD-II monitor must run during drive cycle. If drive cycle is completed and P1000 is not cleared, repeat entire drive cycle. If a particular step is interrupted, repeat drive mode. If drive cycle is interrupted with a key-off, only drive modes that were incomplete must be run. A scan tool can be used to observe a monitor system status, Parameter Identification (PID) values and DTC output.
Note. Rough road conditions may prevent certain steady state conditions and steady accelerations from validating the transmission and load related monitors. On models with Power Take-Off (PTO), disengaged PTO system before performing drive cycle.
CIRCUIT TEST V - CYLINDER IDENTIFICATION (CID)
| WARNING | Voltage at Cylinder Identification (CID) circuit (Yellow/Light Blue wire) is 115 volts. Personal injury may result if proper procedures are not followed. |