Connect scantool and Engine "ON"
Select "Vehicle Speed" parameter on the scantool.
(check wheel speed output value at ABS(ESC) system. And, check vehicle speed at ECM and Air conditioner system.)
Check the "vehicle speed' parameter on the scantool.
Specification : It is changable according to vehicle speed.
Fig.1) Engine ON, 6km/h status after starting - AHLS.
Fig.2) Engine ON, Idle status after starting - VDC, Idle status after starting - Air conditioner system
Are all the parameters normal ?
 | ▶ Fault is intermittent caused by poor contact in the sensor's and/or AHLS ECM connector or was repaired and AHLS ECM memory was not cleared. Throughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.Repair or replace as necessary and go to "Verification Vehicle Repair" procedure. |
 | ▶ Incorrect Vehicle Speed Output (Including ABS(ESC) wheel speed output) : ☞ Repair or replace wheel speed sensor and ABS(ESC) system according to ABS(ESC) troubleshooting guide as necessary and then, go to "Verification of Vehicle Repair" procedure. ▶ Incorrect Vehicle Speed Output after Cluster : ☞ Substitute with a known-good Cluster and check for proper operation. If the problem is corrected, replace Cluster as necessary and then go to "Verification of Vehicle Repair" procedure. ▶ Incorrect Vehicle Speed Output only at AHLS ECM : ☞ Go to "Verification of Vehicle Repair" procedure. |
