Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the System Check?
| --
| Go to
Step 2
| Go to
Instrument Cluster System Check
|
2
|
- Turn the ignition switch to RUN.
- Use the scan tool IPC function in order to read the diagnostic
trouble codes.
Does the scan tool display DTC B1092 (fuel sender fault)?
| --
| Go to
Step 4
| Go to
Step 3
|
3
|
- Turn the ignition switch to OFF.
- Disconnect the fuel tank unit connector.
- Connect 2 red leads from J 33431-C
tester to terminals A (PPL) and D (BLK/WHT)of C420.
- Set the tester resistance dial to 40 ohms (Empty), then
to 250 ohms (Full).
- Cycle the ignition switch from OFF to RUN after each resistance
value is dialed in.
Does the fuel gauge display E at 40 ohms and F at 250 ohms?
| --
| Go to
Step 8
| Go to
Step 7
|
4
|
- Turn the ignition switch OFF.
- Disconnect the fuel tank unit connector.
- Use a fused jumper in order to connect the fuel tank unit harness
connector terminal A (PPL) to ground.
- Turn the ignition switch to RUN.
Does the fuel gauge now read empty before 3 minutes?
| --
| Go to
Step 6
| Go to
Step 5
|
5
|
- Turn the ignition switch to OFF.
- Disconnect the instrument cluster connector.
- Test CKT 30 (PPL) for an open.
- Test the instrument cluster connector C1 terminal E4
(Buick) or Connector C1 terminal C2 (Oldsmobile) for proper terminal
contact.
Are the circuits OK?
| --
| Go to
Step 9
| Go to
Step 11
|
6
|
- Turn the ignition switch to OFF.
- Test CKT 651 (BLK/WHT) for an open.
- Test the fuel tank unit connector for proper terminal contact
at terminals A and D of C420.
- Test the fuel level sender pigtail wiring in the fuel tank unit
for damage.
Are the circuits OK?
| --
| Go to
Step 12
| Go to
Step 11
|
7
|
- Test CKT 30 (PPL) for a short to ground or an open.
- Test CKT 651 (BLK/WHT) for an open.
- Test the instrument cluster connector C1 terminals F16
and E4 (Buick) or connector C1 terminals C2 and 13 (Oldsmobile)
for proper terminal contact.
Are the circuits OK?
| --
| Go to
Step 9
| Go to
Step 11
|
8
| Does the low fuel LED indicator illuminate when the fuel gauge displays E
(Buick)?
Skip this step for Oldsmobile.
| --
| Go to
Step 10
| Go to
Step 9
|
9
| Replace the instrument cluster.
Is the replacement complete?
| --
| Go to
Instrument Cluster System Check
| --
|
10
|
- Test the fuel tank unit connector for proper terminal contact
at terminals A and D of C420.
- Test the fuel level sender pigtail wiring in the fuel tank unit
for damage.
- If the circuit is OK, replace the fuel level sender.
Is the repair complete?
| --
| Go to
Instrument Cluster System Check
| --
|
11
| Repair the affected circuit.
Is the repair complete?
| --
| Go to
Instrument Cluster System Check
| --
|
12
| Replace the fuel level sender.
Is the replacement complete?
| --
| Go to
Instrument Cluster System Check
| --
|
