Octane Adjust Pinpoint Test Kp

EEC-IV - Pinpoint Tests - All Vehicles 17-289
1989

Pinpoint
Octane Adjust KP

Test


[NOTE]


You should enter this Pinpoint Test only when directed here form Quick Test Step 7.0.


[Remember]

This Pinpoint Test is intended to diagnose only the following:

^ Harness circuits; Signal Return, Octane Adjust

^ Octane shorting bar connector




[Pinpoint Test Schematic]


OCTANE ADJUST SHORTING BAR LOCATION

APPLICATION

2.3L EFI Truck Passenger side of fender apron, taped to the self-test connector.
3.0L SEFI SHO Driver side of engine, tie wrapped to a bracket above the transmission.

3.8L SEFI SC Passenger side of engine between shock tower mount and firewall next
to self-test connector.

*TEST PINS LOCATED ON BREAKOUT BOX. ALL HARNESS CONNECTORS VIEWED INTO MATING SURFACE.

The purpose of the Octane Adjust Shorting Bar is to produce effective combustion using optimum spark advance.

^ If the vehicle detonates (spark knock), remove the Octane Adjust Shorting Bar. This will retard spark an additional three to four degrees.

^ If the vehicle continues to detonate (spark knock), use a higher grade of octane fuel.