![]() A timing light may also bee hooked up, and the timing should advance by 20 degrees during this test. The computer will test items, including the timing. The code reader will flash twice (for a four cylinder) three times (for a 6 cylinder), four times (for and 8 cylinder), and five times (for a diesel). This test is complete when code 11 (system pass) has been displayed. A 2 or three digit code will be several quick sweeps (1-9) followed by a 1 second pause, than the next number. Codes will be displayed as needle sweeps in groups of 2 or 3, followed by a 6 second delay. Once the multi-meter is attached, turn the ignition on, and watch the needle. You want to make sure the engine is fully warmed up, automatic transmission in park, or manual transmission in neutral, with the parking brake on, or the wheels blocked. ![]() A jumper wire is also necessary (as below). The Positive lead of the multi-meter can be attached to the battery’s (+) terminal, and the negative lead of the multi-meter can be attached to the connection as below. An easy way to utilize this terminal without an expensive scan tool is with an analog multi-meter, set on DC Voltage (20V setting, or nearest equivalent). It is usually red or gray in color, and has a distinctive shape as shown below. On the passenger’s side, under the hood, there is the computer’s self-diagnostics output terminal.
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