Operation CHARM: Car repair manuals for everyone.
Home >> Isuzu >> 1987 >> Impulse L4-1994cc 2.0L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Engine Control System >> DTC 73
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

DTC 73


1. Disconnect vacuum switching valve.
2. Check vacuum switching valve by applying battery voltage directly to vacuum switching valve.
3. Resistance of vacuum switching valve should be approximately 35 ohms. If not, replace valve.



pro multis · About Operation CHARM