Diagnostic Aids
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- If the voltage for the ignition circuit voltage between the K56 Serial Data Gateway Module and K20 Engine Control Module is greater than within 1 V of each other the DTC will set.
- If the fault is not current, the high system voltage could be a result of overcharging with a battery charger or after jump starting the vehicle.
- Wiring Schematics for the component(s) being tested need to be used to accurately identify the specific circuit numbers and terminals.
- The last 2 digits of the circuit number are significant in identifying its power and/or ground function.
- Circuits ending in 42 are primary fused B+ circuits (generally the first fuse in the circuit after the battery)
- Circuits ending in 40 are secondary fused circuits (generally fuses in a fuse block after the primary circuit)
- Circuits ending in 39 and 41 are ignition voltage circuits.
- Circuits ending in 50 are grounds.
- Circuits ending in 51 are low reference (ground).