Circuit/System Testing

WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, the fuel pump should not be running.
- If the fuel pump runs continuously, test the relay switch supply circuit terminal 87 for a short to voltage. If the circuit tests normal, replace the fuel pump relay.
Ignition OFF, remove the fuel pump relay from the electrical center with the J 43244 .
Test for less than 5 ohms of resistance between the relay coil ground circuit terminal 85 and ground.
- If greater than the specified range, repair the relay coil ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the relay switch B+ voltage circuit terminal 85 and ground.
- If the test lamp does not illuminate, repair the relay switch B+ voltage circuit for a short to ground or an open/high resistance.
Install a 15A fused jumper wire between the relay switch B+ voltage circuit terminal 85 and the relay switch supply circuit terminal 87. The fuel pump should turn ON.
- If the fuel pump does not turn ON, test for the following conditions:
  - An open/high resistance in the relay switch supply circuit
  - An open/high resistance in the fuel pump ground circuit
- If the above circuits test normal, replace the fuel pump.
Ignition OFF, connect a test lamp between the relay coil control circuit terminal 86 and ground.
Ignition ON, command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
- If the test lamp is always ON, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- If the test lamp is always OFF, test the relay coil control circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the fuel pump relay.