Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
Or, hide this message:
temporarily or
permanently
MAP Output Check - With Speed Density Update
A "Scan" displays manifold pressure in volts. Low pressure (high vacuum) reads a low voltage while a high pressure (low vacuum) reads a high voltage A failure in the
Manifold Absolute Pressure (MAP) sensor circuit should set a Code 33 or 34 and using the chart will find the cause of the problem. A Code 33 may be set if a rough or unstable idle exists. Chart C-1D can also be used to check Manifold Absolute Pressure (MAP) sensor. Refer to System Diagnosis / Diagnostic Charts.