Pre-Check

Precheck Diagnosis Procedure

1. Check for DTC's. (See How To Display And Read Diagnostic Trouble Codes.
Displaying & Reading Trouble Codes

2. Clear DTC's. (See How To Clear Diagnostic Trouble Codes.)
Clearing Trouble Codes

3. Measure ECU Terminal Values. (See ECU Pinout Values.)
Pinout Values and Diagnostic Parameters

4. Perform Speed Sensor Signal Check. (See Wheel Speed Sensor.)
Wheel Speed Sensor