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Code 34 - EGR Solenoid Valve

NOTE: For ECM harness connector terminal identification, see
  1. Turn ignition on. Using a DVOM, check voltage between ECM harness connector terminal D14 (backprobe) and ground. Voltage should be 10 volts or greater. If voltage is not as specified, go to next step. If voltage is as specified, go to step 4).
  2. Turn ignition off. Disconnect ECM and main relay harness connectors. Using an ohmmeter, check resistance between ECM harness connector terminal D14 and main relay harness connector terminal No. 1 (Black/White wire). Resistance should be zero ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair circuit as necessary.
  3. Turn ignition on. Using a DVOM, check voltage between ground and main relay harness connector terminals No. 1 (Black/White wire) and 2 (Brown/Black wire). Voltage should be 10 volts or greater at both terminals. If voltage is as specified, replace main relay. If voltage is not as specified, repair appropriate circuit as necessary.
  4. Turn ignition on. Using a DVOM, check voltage between ECM harness connector terminal D22 (backprobe) and ground. Voltage should be 7 volts or greater. If voltage is not as specified, go to next step. If voltage is as specified, check ECM harness connector terminals for good contact. Repair terminals as necessary. If harness connector terminals are okay, replace ECM.
  5. Turn ignition off. Remove collector and disconnect EGR solenoid valve harness connector. Using an ohmmeter, check resistance between ECM harness connector terminal D22 and EGR solenoid valve harness connector terminal No. 2 (White/Black wire). Resistance should be zero ohms. If resistance is as specified, replace EGR solenoid valve. If resistance is not as specified, repair circuit as necessary.
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