DTC 41: Abnormal Signal Output To Engine Control Module

NOTE: DTC 41 is set when serial communication circuit between TCL module and Engine Control Module (ECM) is interrupted due to open or short circuit.

Ensure ignition is off. Disconnect TCL module connector and ECM connector. See Figure and Figure . Connect jumper wires between TCL module terminals No. 7 (White wire) and ground, and No. 17 (Black wire) and ground. See Figure .
Using DVOM in ohmmeter mode, check continuity between specified ECM connector terminals and ground. See Figure . See DTC 41 CONTINUITY CHECK table. If continuity exists, go to next step. If continuity does not exist, inspect and repair open circuit(s) as needed. See WIRING DIAGRAMS .
Disconnect jumper wires. Check continuity between TCL module connector terminals No. 7 and 17, and ground. If continuity does not exist, go to next step. If continuity exists, inspect and repair circuit(s) for short to ground.
Check continuity between TCL connector terminals No. 7 and 17. If continuity exists, inspect and repair circuit(s) for short as needed. If continuity does not exist, substitute ECM with known-good unit.
Clear DTCs. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM. Test drive vehicle. Retrieve DTCs. If DTC 41 resets, replace TCL module. If DTC 41 does not reset, replace ECM.

DTC 41 CONTINUITY CHECK

TCL Connector Terminal No. ⁽¹⁾

Wire Color

⁽²⁾ ECM Connector Terminal No.

White

Black

⁽¹⁾	See Figure .

⁽²⁾	See Figure .