Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1991 >> Navajo 2WD V6-4.0L OHV >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> KP - Octane Adjust
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

KP - Octane Adjust

Enter this Pinpoint Test only when directed here from Quick Test step 9.0 (Diagnosis By Symptom).

This Pinpoint Test is only intended to diagnose the following:

1. Octane shorting bar connector.
2. Harness circuits: VPWR, Octane adjust.

The purpose of the octane adjust shorting bar is to optimize combustion by providing a mechanism to permit spark advance modification.

If detonation occurs, removing the octane adjust shorting bar will retard spark timing an additional three to four degrees. If detonation continues, use of a higher octane grade of fuel is recommended.


PINPOINT TEST KP SCHEMATIC

Pinpoint Test KP Schematic:






pro multis · About Operation CHARM