Pinpoint Test Instructions

Do not perform any of the following pinpoint test unless you are instructed to do so by the Quick Test. Each pinpoint test assumes that a fault has been detected in the system with direction to enter a specific repair routine. Doing any Pinpoint Test without direction from the Quick Test may produce incorrect results and replacement of satisfactory components.
Correct test results for the Quick Test procedure are dependent on the proper operation of releated non-electronic components/systems. It may be necessary to correct any defects in these areas before the system will pass the Quick Test procedure. Refer to Diagnostic Routines for service.
Do not replace any components unless the test results indicates that components should be replaced. When more than one service code is received, always start service with the first code received.
Do not measure voltage or resistance at the processor or connect any test lights to it, unless specified to do so by the pinpoint test.
Isolate both ends of a circuit, and turn the ignition key to the Off position, whenever checking for shorts or continuity, unless specified.
Disconnect solenoids and switches from the harness before measuring for continuity, resistance, or energizing by of a 12 volt source.
When using the Pinpoint Test, follow each step in order, starting from the first step in the appropriate test. Follow each step until the fault is found.
After completing any repairs to the EEC system, verify all components are properly reconnected and repeat the functional test.
An open is defined as any resistance reading greater than 5 ohms unless otherwise specified. A short is defined as any resistance reading less than 10,000 ohms to ground, unless otherwise specified.