Diesel CEC Tests W/Codes: Description

The Diesel Electronic Control (DEC) system is used on California 6.2L diesel engines with light duty emissions. The DEC system monitors various engine functions to electronically control the exhaust gas recirculation (EGR) system and torque converter clutch (TCC). The Electronic Control Module (ECM) is the "brain" of the system.

Fig 1: Engine Speed Sensor Location (Pickup Models Only)

Fig 2: MAP Sensor Location

Fig 3: Throttle Position Sensor Location

Fig 4: EGR System Components and Locations

Fig 5: Diesel Diagnostic Check Tester This tester must be used to determine system failures.

Fig 6: ALCL Connector Identification. ALCL is located under left side of dash on pickup models and under driver's seat on van models.

Fig 7: ECM Location. ECM is located under right side of dash on pickup models and under driver's seat on van models.

Fig 8: DEC System Component Locations for Trucks and Vans