Corvette V8-7.0L VIN E (2006)
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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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:
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Fuel Fuse
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O2 Sensor Fuse
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ETC Fuse
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Emission Fuse
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EVEN INJ Fuse
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ODD INJ Fuse
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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.
COMPONENT TESTING
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Measure for 70-110 ohms between terminals 85 and 86 of the relay.
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If the resistance is not within the specified range, replace the relay.
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Measure for infinite resistance between terminals 30 and 86 of the relay.
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If continuity is detected, replace the relay.
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Measure for infinite resistance between terminals 30 and 87 of the relay.
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If continuity is detected, replace the relay.
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Measure for infinite resistance between terminals 30 and 85 of the relay.
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If continuity is detected, replace the relay.
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Measure for infinite resistance between terminals 85 and 87 of the relay.
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If continuity is detected, replace the relay.
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Connect a 20 amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative
battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM.
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If the resistance measures more than 2 ohms, replace the relay.
REPAIR INSTRUCTIONS
IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness)
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Underhood Electrical Center or Junction Block Replacement
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Engine Control Module Programming and Setup See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests and Procedures