P0522
DTC P0522: EOP Sensor Circuit Low Voltage1. Reset the ECM with the HDS.
2. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
3. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0522 indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EOP sensor and the ECM.
4. Turn the ignition switch OFF.
5. Disconnect the EOP sensor 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between EOP sensor 3P connector terminals No.1 and No.3.
Is there about 5 V?
YES - Go to step 9.
NO - Go to step 8.
8. Measure voltage between ECM connector terminals A10 and A20.
Is there about 5 V?
YES - Repair open in the wire between the ECM (A20) and the EOP sensor.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
9. Turn the ignition switch OFF.
10. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
11. Disconnect ECM connector C (22P).
12. Check for continuity between EOP sensor 3P connector terminal No.2 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (C3) and the EOP sensor.
NO - Go to step 13.
13. Substitute a known-good EOP sensor, then recheck.
14. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0522 indicated?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Replace the EOP sensor.