Symptom Diagnostics

For symptom diagnostic chart reference, refer to the following list.

• Engine starts and accelerates poorly when cold. See Fig 1.
• Engine does not start. See Fig 1.
• Engine has uneven idle. See Fig 1.
• Engine has insufficient output. See Fig 1.
• Engine runs unevenly (shakes). See Fig 2.
• Engine runs unevenly (misfiring). See Fig 2.
• Engine surges after cold start. SeeFig 2.
• Transition failure during warm-up. See Fig 2.
• Transition failure when warm or high fuel consumption. See Fig 2.
• Engine vibrates. See Fig 2.
• EPC MIL (A1e43) illuminates and EA is in "limp-home" mode. See Fig 2.

Fig 1: Symptom Diagnostics (1 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Symptom Diagnostics (2 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.