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Home › Kia › 2003 › Rio Base, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0340: Camshaft Position Sensor Circuit Malfunction › Test Procedure

Test Procedure

  1. Turn ignition off. Thoroughly check CMP sensor. Also check for loose, bent, corroded, contaminated, deteriorated or damage CMP sensor and ECM harness connectors terminals. If sensor and connectors terminals are okay, go to next step. If sensor and connectors terminals are faulty, repair or replace as necessary. Go to step  7 .
  2. Disconnect CMP sensor 3-pin harness connector. See Figure . Turn ignition on. Measure voltage between ground and CMP sensor connector terminal No. 1 (Red/Yellow wire). Voltage should be battery voltage. If voltage is as specified, go to step  4 . If voltage is not as specified, go to next step.
  3. Turn ignition off. Locate fuses and Main relay in engine compartment fuse/relay box. See Figure . Check Main relay operation and fuses condition. For Main relay operation test. See FUEL PUMP & MAIN RELAYS (RIO) under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. If necessary, also check Main relay circuits. See RIO under ENGINE PERFORMANCE in WIRING DIAGRAMS article. If fuses, relay and circuits are okay, go to next step. If fuses, relay or circuits are faulty, repair or replace as necessary. Go to step  7 .
  4. Disconnect ECM harness connector "B04". See Figure . Measure resistance between CMP sensor connector terminal No. 2 (Red/Black wire) and ECM connector terminal B04-18. Also measure resistance between CMP sensor connector terminal No. 3 (Yellow wire) and ECM connector terminal B04-8. Both resistances should be below one ohm. If resistances are as specified, go to next step. If any resistance is not as specified, repair open circuit as necessary. Go to step  7 .
  5. With CMP sensor and ECM harness connectors disconnected. Turn ignition on. Measure voltage between ground and CMP harness connector terminal No. 2 (Red/Black wire). Voltage should be below 0.5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short circuit as necessary go to step  7 .
  6. Turn ignition off. With CMP sensor and ECM harness connectors disconnected. Measure resistance between ground and CMP sensor connector terminal No. 2 (Red/Black wire). Also measure resistance between CMP sensor connector terminals No. 1 (Red/Yellow wire) and No. 2 (Red/Black wire). Measure resistance between terminals No. 1 (Red/Yellow wire) and No. 3 (Yellow wire). Measure resistance between terminals No. 2 (Red/Black wire) and No. 3 (Yellow wire). All resistances should be infinite. If resistances are as specified, temporarily install a known good CMP sensor and check for proper operation. If problem is corrected, replace CMP sensor. Go to next step. If any resistance is not as specified, repair short circuit as necessary. Go to next step.
  7. After repair, return vehicle to original condition. Clear codes using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.
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