Instructions For Using The Circuit Tests

Circuit Tests are performed to correct a service code. Perform check as instructed. After replacing components or repairing circuits, repeat FUNCTION TEST and check engine operation.

Observe the following instructions when performing Circuit Tests:

DO NOT measure voltage or resistance at MCU, or connect test lamps to it (unless specific instructions say to do so).
Disconnect both ends of a circuit when checking for continuity or shorts. Ensure ignition is turned off.
Disconnect solenoids and switches from harness before measuring resistance or continuity.
When more than one service code is indicated, start service with the first code received.
Use diagrams to locate pin locations and connectors.

NOTE: Partial wiring diagrams are provided for most CIRCUIT TESTS to aid in servicing. For complete system wiring diagram and connector terminal locations, see Figure .