Diagnostic Tests: Notes
CAUTION:
Before proceeding, see ANTI-LOCK BRAKE SAFETY PROCEDURES
article in GENERAL INFORMATION.
CAUTION:
When battery or ECM is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until adaptation systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION before disconnecting battery.
NOTE:
To properly diagnose vehicle, it is recommended to use MUT II (MB991502) scan tool. Before replacing any component that scan tool suggests is faulty, ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. For circuit identification, see PIN VOLTAGE CHARTS
or WIRING DIAGRAMS
. To locate harness connectors called out in testing, see Figure
and Figure
.