Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 1988 >> 924 S L4-2479cc 2.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Coolant Temperature Sensor/Switch (For Computer) >> Testing and Inspection
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

Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection


1. With ignition Off, disconnect multiple pin plug from DME ECM.
2. With temperature sensor wire connector attached, connect suitable ohmmeter test leads across ECM connector terminal 13 and ground. Resistance should be as follows:
Resistance @ 0°C (32°F) 4.4K - 6.8K ohms
Resistance @ 15 - 30°C (59 - 86°F) 1.4K - 3.6K ohms
Resistance @ 40°C (104°F) 1.0K - 1.3K ohms
Resistance @ 80°C (176°F) 250 - 390 ohms
Resistance @ 100°C (212°F) 160 - 210 ohms
3. If measurements obtained are outside specifications, repeat test on temperature sensor to determine if problem lies with sensor or with wiring.


pro multis · About Operation CHARM