Harness Inspection

Measure sensor power supply voltage. Disconnect sensor harness connector. Turn ignition on. Using DVOM, measure voltage between vehicle ground and terminal No. 2 (Yellow/Green wire on Sonata V6, Yellow/Red wire on all other models). Voltage should be 4.5-4.9 volts. If voltage is within specification, go to step 3 . If voltage is not within specification, go to next step.

Turn ignition off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal and vehicle ground. See CTS INPUT TERMINAL IDENTIFICATION table for ECM terminal number. Using ohmmeter, check continuity between vehicle ground and sensor harness connector terminal No. 1 (Black wire). If continuity does not exist, inspect and repair circuit. If continuity exists, substitute ECM with known good unit and retest. Go to next step.

CTS INPUT TERMINAL IDENTIFICATION ⁽¹⁾

Engine Application

ECM Terminal Number

Connector Number

Wire Color

Elantra

C01-1

Yellow/Red

Excel (CA)

C50-5

Yellow/Red

Excel (Fed)

C50-1

Yellow/Red

Sonata 4-Cyl.

C01-1

Yellow/Red

Sonata V6

C81-1

Yellow/Green

⁽¹⁾	See Figure , Figure and Figure

Check continuity of sensor to ECM ground circuit. Ensure ignition is off. Using ohmmeter, check resistance between sensor harness connector terminal No. 1 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.