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Home › Chevrolet › 2006 › Corvette Base, 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - 6.0L - Troubleshooting & Diagnosis › Powertrain Relay Diagnosis › Circuit/System Testing

Circuit/System Testing

  1. With the ignition OFF, remove the powertrain ignition 1 relay from the underhood fuse block.
  2. With the ignition ON, measure for battery positive voltage (B+) between the relay coil voltage supply circuit and ground.
    • If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure less than 2 ohms.
  3. Measure for voltage between the relay coil control circuit and ground.
    • If voltage is measured on the control circuit of the relay, test for a short to voltage or a faulty ECM.
  4. Connect a test lamp between the battery positive voltage supply circuit of the relay coil and the relay coil control circuit at the underhood fuse block. Use a scan tool to command the powertrain ignition 1 relay ON and OFF. The test lamp should turn ON and OFF when toggling between the commanded states.
    • If the test lamp stays ON all the time, test for a short to ground on the relay coil control circuit or a faulty ECM.
    • If the test lamp stays OFF all the time, test for an open or high resistance on the relay coil control circuit or a faulty ECM. All wire circuit resistance should measure less than 2 ohms.
  5. Measure for B+ between the relay armature supply circuit, and ground.
    • If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay armature. All wire circuit resistance should measure less than 2 ohms.
  6. With the ignition ON, test for voltage on each test point of the ETC fuse in the underhood fuse block.
    • If voltage is present, test the ignition 1 voltage circuit between the ECM, the powertrain ignition 1 relay, and the ETC fuse for a short to voltage.
    • If both circuits test normal, replace the ECM.
  7. Connect a 20-amp fused jumper wire between the B+ terminal and the ignition 1 voltage terminal of the powertrain ignition 1 relay at the underhood fuse block. With a test lamp, probe both test points of the ETC fuse.
    • If the test lamp illuminates at both test points of the ETC fuse, repair the ignition 1 voltage circuit between the powertrain ignition 1 relay and the ECM for an open, high resistance, or a faulty ECM. All wire circuit resistance should measure less than 2 ohms.
    • If the test lamp only illuminates at one test point of the ETC fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary.
    • If the test lamp does not illuminate on either test point of the ETC fuse, repair the open or high resistance between the powertrain ignition 1 relay and the ETC fuse. All wire circuit resistance should measure 2 ohms or less.
  8. With a test lamp, test for voltage on both test points of the following fuses:
    • Fuel Fuse
    • O2 Sensor Fuse
    • ETC Fuse
    • Emission Fuse
    • EVEN INJ Fuse
    • ODD INJ Fuse
    • If the test lamp fails to illuminate on one test point of each fuse, repair the open or high resistance between the fuse and the powertrain ignition 1 relay. All wire circuit resistance should measure 2 ohms or less.
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