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Sonata (2.7L)

  1. Turn ignition off. Disconnect PCM/ECM control relay harness connector and remove relay. Relay is mounted behind center console, under radio. Check for continuity between relay terminals No. 2 and 4. See Figure. If continuity is present, go to next step. If continuity is not present, replace PCM/ECM control relay. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary.
  2. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. Using another fused jumper wire, connect relay terminal No. 2 to ground. Check for continuity between relay terminals No. 1 and 5. If continuity is present, go to next step. If continuity is not present, replace PCM/ECM control relay.
  3. Remove battery voltage and ground from PCM/ECM control relay. Check for continuity between relay terminals No. 1 and 5. If continuity is not present, go to next step. If continuity is present, replace PCM/ECM control relay.
  4. Turn ignition off. Measure voltage between ground and PCM/ECM control relay harness connector terminals No. 1 (Orange wire) and No. 4 (Orange wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in Orange wire between relay and MAIN fuse (30-amp) located in engine compartment junction block. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary.
  5. Turn ignition off. Check for an open or short in Blue wire between engine control relay connector terminal No. 2 and PCM/ECM connector No. C94-2 terminal No. 23. See Figure. Perform repairs as necessary. If Blue wire is okay, test is complete.
  6. Turn ignition off. Check for an open or short in Pink wire between engine control relay connector terminal No. 5 and PCM/ECM connector No. C94-1 terminal No. 8. Perform repairs as necessary. If Pink wire is okay, inspection is complete. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary.
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