Test 10: Fuel Pump Inspection
TEST 10: FUEL PUMP INSPECTION
| TEST 10 |
FUEL PUMP INSPECTION |
| STEP |
INSPECTION |
ACTION |
| 1 |
CHECK FUEL PUMP FOR OPERATION
- Verify that the battery is fully charged.
- Verify that the fuel tank assembly connector B-422 is securely connected.
- Key ON, Engine OFF (KOEO).
- Connect NGS Tester to DLC and select Active Command Mode.
- Select OUTPUT TEST MODE.
- Press MODE to change to "ALL ON" mode, and press START to run fuel pump.
- Listen to the fuel pump to verify operation.
- Turn relay off.
- Did the fuel pump operate?
|
Yes |
Fuel pump is operating.
See
TEST 5: FUEL DELIVERY SYSTEM
for more troubleshooting procedures. |
| No |
Go to step 2. |
| 2 |
CHECK FUEL PUMP FOR CONTINUITY
- Disconnect fuel tank assembly connector B-422.
- Check for continuity between fuel tank unit power (P/B) and ground (B) terminals.
- Is continuity present?
|
Yes |
Go to step 3. |
| No |
Replace fuel pump.
See FUEL SYSTEM
in REMOVAL, OVERHAUL, & INSTALLATION article in Engine Performance
. |
| 3 |
CHECK VOLTAGE AT FUEL PUMP VEHICLE HARNESS CONNECTED
- Connect NGS Tester to DLC.
- Key ON, Engine OFF (KOEO).
- Select Active Command Mode.
- Select OUTPUT TEST MODE.
- Press MODE to change to "ALL ON" mode, and press START to run fuel pump.
- Measure the voltage at the power terminal of the fuel tank assembly connector B-422.
- Is voltage greater than 10.5 volts?
|
Yes |
Go to step 4. |
| No |
Check fuel pump relay and fuel pump shutoff switch. |
| 4 |
CHECK FUEL PUMP GROUND CIRCUIT
- Fuel tank assembly connector B-422 disconnected.
- Measure resistance between tank assembly connector B-422 ground terminal and chassis ground.
- Is resistance less than 1 ohm?
|
Yes |
Ground circuit is OK.
Recheck fuel pump. |
| No |
Repair open circuit on connector to chassis ground circuit. |