For 1990-2009 cars

## CHECK GAGES Indicator Always On Pontiac w/UB3

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. Disconnect connector C2 of the powertrain control module (PCM).
2. Turn the ignition switch to the RUN position.

Does the CHECK GAUGES indicator illuminate?

--

Go to Step 3

Go to Powertrain Control Module Diagnosis

3 | Inspect for a short to ground in CKT 35 (DK GRN). Was there a problem with CKT 35? | -- | Go to Step 5 | Go to Step 4
4 | Inspect for a short to ground in CKT 25 (BRN). Was there a problem with CKT 25? | -- | Go to Step 7 | Go to Step 6
5 | Repair the short to ground in CKT 35 (DK GRN). Refer to Repairing Damaged Wire Insulation in Wiring Systems. Is the repair complete? | -- | Go to Instrument Cluster System Check | --
6 | Replace the instrument cluster. Refer to Instrument Cluster Replacement Is the repair complete? | -- | Go to Instrument Cluster System Check | --
7 | Repair the short to ground in CKT 25 (BRN). Refer to Repairing Damaged Wire Insulation in Wiring Systems. Is the repair complete? | -- | Go to Instrument Cluster System Check | --

## CHECK GAGES Indicator Always On Pontiac w/ U50/U2F

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

1. Start the engine.
2. Watch the instrument cluster.

Does the fuel tank symbol light along with the CHECK GAUGES indicator?

--

Go to Step 4

Go to Step 3

3 | Does the engine symbol light along with the CHECK GAUGES indicator? | -- | Go to Step 5 | Go to Step 11
4 | Inspect for a suspected fuel gauge problem, refer to Fuel Gage Inaccurate or Inoperative . Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
5 | Inspect for a suspected coolant temperature gauge condition. Was there a problem with the coolant temperature gauge? | -- | Go to Engine Coolant Temperature Gage Inaccurate or Inoperative | Go to Step 8
6 | Inspect for a suspected oil pressure gauge condition. Was there a problem with the oil pressure gauge? | -- | Go to Engine Coolant Temperature Gage Inaccurate or Inoperative | Go to Step 8
7 | Inspect for a suspected volts gauge condition. Was there a problem with the volts gauge? | -- | Go to Volt Gage Inaccurate or Inoperative | Go to Step 8
8 |

1. Disconnect the instrument cluster connector C2.
2. Measure the resistance between the instrument cluster connector C2 terminal A9 and ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 10

Go to Step 9

9 |

1. For the U50 cluster, disconnect the instrument cluster connector C1.
2. Test the resistance between the instrument cluster connector C1 terminal B13 (BRN) and ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 12

Go to Step 11

10 | Test CKT 35 (DK GRN) for a short to ground. Was there a problem with CKT 35? | -- | Go to Step 13 | Go to Step 14
11 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
12 | Test CKT 25 (BRN) for a short to ground between the generator and the instrument cluster. Was there a problem with CKT 25? | -- | Go to Step 15 | Go to Step 14
13 | Repair the short to ground in CKT 35 (DK GRN). Refer to Repairing Damaged Wire Insulation in Wiring Systems. Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
14 | Refer to Engine Electrical. Did you complete the repair? | -- | Go to Instrument Cluster System Check | --
15 | Repair a short to ground in CKT 25 (BRN). Refer to Repairing Damaged Wire Insulation in Wiring Systems. Did you complete the repair? | -- | Go to Instrument Cluster System Check | --