Operation CHARM: Car repair manuals for everyone.
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

Calculated ECT

The display shows temperature from -40°C to 151°C. This display indicates the predicted coolant temperature the PCM calculates during the Engine Cooling System Performance test (DTC P1483). This display only updates when DTC P1483 is testing. Catalyst EWMA Samples: The display shows the number of samples from 0 to 255. This display indicates the number of catalyst Exponentially Weighted Moving Average (EWMA) samples that have been completed. The number of samples will reset to 0 if a DTC clear codes or a battery disconnect has occurred. The idle catalyst test requires at least 6 samples to pass but it can fail with less than 6 samples.