How to Use Quick & Pinpoint Test Charts

NOTE: The QUICK TEST procedure should be used ONLY when the Diagnostic Routines direct you here.


To test and service the EEC-IV subsystem correctly, perform the Quick Test first, and, if the vehicle passes all three phases of the quick test (Key ON/Engine OFF, Engine Running and Continuous Test) without running (performing) any Pinpoint Tests (actually correcting faults), the EEC-IV subsystem is satisfactory and the vehicles problem, if any, exists elsewhere (other than the EEC-IV subsystem). However, if a step of the quick test fails, perform only the Pinpoint Tests (by determining the code or codes and actually repairing the problem) specified by the failed step procedure. Do not begin any Pinpoint Test without following the instructions at the beginning of the Pinpoint Test procedure. After all tests and services have been completed, repeat the entire quick test procedure to ensure the EEC-IV subsystem operates satisfactory.





When conducting the pinpoint test procedure(s) the test charts given, indicate the type test that will be made and the chart number (A through Z). Within each pinpoint test procedure, references are made to substeps within the actual test procedure. For example, the first pinpoint test that you are referred to (from the quick test procedures) will be Pinpoint test, No Start Problem. The test letter indicated is located on the upper righthand corner of the pinpoint test chart. As you perform the procedure, references to A, A1, A2, etc. These references are pinpoint test substeps. These substeps are not found on the pinpoint test index. These references are located in the Quick test charts, and found under each main test letter.



Each pinpoint test assumes that a fault (malfunction) has been detected in the system with direction to enter a specific repair routine. Conducting any pinpoint test without direction from the quick test procedures may produce incorrect results and replacement of satisfactory components. Correct test results are dependent on the proper operation of non-related EEC components/systems. Do not replace any components unless it has been determined that they should be replaced. If more than one service code is received, always start the service with the first code received. Do not measure voltage or resistance at the processor or connect any test lights to the processor unless specified to do so with the quick and/or pinpoint test procedures. Isolate both ends of a circuit, then turn ignition switch to OFF position when checking for shorts of circuit continuity, unless specified to do so with the quick and/or pinpoint test procedures. Disconnect solenoids and/or switches from the harness before measuring for continuity or resistance. When using the pinpoint tests, follow each step in order, starting from the first step in the appropriate test. Follow each step until the fault (malfunction) is found. After completing any repairs to the EEC-IV system, ensure all components are properly connected and repeat functional test. During the test procedure, an open is defined as any resistance obtained greater than 5 ohms, unless otherwise specified within the quick and/or pinpoint test charts. A short is defined as any resistance value obtained of less than 10,000 ohms to ground.


QUICK TESTS TESTING STEPS




To conduct accurate and safe EEC-IV quick test procedures, the proper equipment must be used and correctly installed or serious EEC-IV system and/or system component(s) damage may result. As stated previously, the tools listed or suitable equivalents must be used to conduct and complete these test procedures. The quick test steps are as follows:
1. Visual check and vehicle preparation. Check system for obvious faults or malfunctions. Properly prepare vehicle for system test.
2. Equipment Hookup. Ensure that the proper equipment for gathering test data is ready, prior to testing this system.
3. Service codes. The service codes are as follows: fast codes, engine identification code, engine service code and continuous codes.
4. Key ON/Engine OFF Self-Test. This step checks the processor inputs against calibrated sensor values.
5. Continuous Self-Test, checks the sensor inputs for opens and/or shorts while the vehicle is in operation.
6. Output Cycling Test. The processor activates all outputs when the throttle is cycled for additional diagnostics.
7. Computed Timing Check, verifies the systems ability to compute and maintain engine timing in the self-test.
8. Engine Running Test, checks sensors and actuators under operating conditions.
9. Pinpoint Tests. Is the corrective action to take only when a problem is detected by the functional test.