Description:

Error code ECU 000637.05 is triggered when the ECU detects low current on the crankshaft speed sensor wiring, indicating high circuit resistance, which suggests an open circuit. This condition can lead to inaccurate or missing crankshaft position data, affecting engine timing and performance.

Reaction:

The ECU may limit engine power or alter timing to prevent potential damage due to inaccurate crankshaft position data.

Recommendations:

• Inspect Wiring for Damage: Check the crankshaft speed sensor wiring for any signs of wear, damage, or disconnections that could cause an open circuit.
• Measure Circuit Resistance: Use a multimeter to measure the resistance in the sensor circuit and identify any points of high resistance.
• Repair or Replace Wiring: Address any issues by repairing or replacing the wiring to restore proper current flow.
• Test Sensor Operation: After repairs, test the crankshaft speed sensor to ensure it provides accurate data to the ECU.
• Reset ECU and Verify Functionality: Reset the ECU and verify the system operates correctly, with no further errors.

Note:

Maintaining proper wiring and connections for sensors is crucial for accurate engine management and performance.