Pinpoint Test Instructions

DO NOT perform any of the following Pinpoint Tests unless you are instructed to do so by the Quick Test (On Board Diagnostic Check). Each Pinpoint Test assumes that a fault has been detected in the system with direction to enter a specific repair routine. Service codes retrieved in Erase and Retest or Key On Engine Running (KOER) test, implies that a hard fault is present and the associated Pinpoint Test should be performed to isolate the cause. If more than one service code is received, always start service with the first code received. With the knowledge of the symptom, a close observation can be made of each specified component, by performing the associated Pinpoint Test. Before performing Pinpoint Test, check wiring, wiring circuits, and components to the control module. Loose connections, corrosion, overheating and physical damage are often cause of failure. DO NOT replace any components unless the test result indicates that components should be replaced. Do not measure voltage or resistance at the control module or connect any test lights to it, unless specified to do so by the Pinpoint Test charts. Disconnect solenoids and switches from the harness before measuring for continuity, resistance, or energizing with a power source. When using the Pinpoint test procedure, follow each step in order, starting from the first step in the appropriate test. Follow each step until the fault is located. Erase codes and perform Quick Test to insure any repairs made are effective. An open circuit is defined as any resistance reading obtained greater than 10,000 ohms, unless otherwise specified. A short circuit is defined as any resistance reading obtained of less than 5 ohms, unless otherwise specified.