Ignition "OFF" & Engine "OFF".

Connect MAFS & Acceleration pedal sensor 1 connector.

Ignition " ON" & Engine "OFF".

Monitor that DTC P1523 is retrieved again after connecting MAFS & APS.

Is the DTC P1523 retrieved again ?

YES

▶ Substitute with a known-good MAFS or/and APS and check for proper operation.

If the problem is corrected, replace MAFS or/and APS and then go to "Verification of Vehicle Repair" procedure.

NO

▶ Substitute with a known-good ECM and check for proper operation.

If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.