For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Instrument Cluster System Check? | -- | Go to Step 2 | Go to Instrument Cluster System Check
2 |

1. Turn off the ignition switch.
2. Disconnect the boost/manifold absolute pressure (MAP) sensor.
3. Turn on the ignition switch.

Does the boost gauge remain on?

--

Go to Step 4

Go to Step 3

3 | Replace the boost/manifold absolute pressure (MAP) sensor. Refer to the appropriate procedure:

• | Manifold Absolute Pressure Sensor Replacement

• | Manifold Absolute Pressure Sensor Replacement

Is the repair complete?

--

Go to Instrument Cluster System Check

--

4 | Inspect CKT 891 (BLK) for a short to voltage. Is the wire OK? | -- | Go to Step 6 | Go to Step 5
5 | Repair the short to voltage on CKT 891 (BLK). Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
6 | Inspect connector C101 terminal F7 and connect C200 terminal A9 for proper terminal contact. is the terminal contact OK? | -- | Go to Step 8 | Go to Step 7
7 | Repair the poor terminal contact. Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
8 | Replace the instrument cluster. Refer to one of the following procedures:

• | IP Cluster Replacement (Buick)

• | IP Cluster Replacement (Oldsmobile)

• | IP Cluster Replacement (Pontiac)

Did you complete the repair?

--

Go to Instrument Cluster System Check

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