Precautions For ECCS Testing - Electrical Testing (ITB96-048)

Publication date: 1996-11-13
Reference number: ITB96-048
Supersedes refnos: EC96-009

PRECAUTIONS FOR ECCS TESTING - ELECTRICAL TESTING

TECHNICAL SERVICE BULLETIN

Reference Number(s): EC96-009, Date of Issue: November 13, 1996

PRECAUTIONS FOR ELECTRONIC CONCENTRATED ENGINE CONTROL SYSTEM (ECCS) TESTING

Model(s): All Infiniti Models

Classification: EC96-009

Section: Engine Control System

Bulletin No.: ITB96-048

Date: November 13, 1996

SERVICE INFORMATION

Always use caution when performing electrical checks on the electrical harness or engine control module (ECM) to avoid damaging the ECM. NEVER apply direct battery voltage to any terminal of the ECM by either connecting a 12 volt battery positive (+) terminal, or by jumping (short circuiting) any actuator that is connected to the ECM. See Fig 1 . Below is a partial list of typical actuators:

Relays (fuel pump, A/C, cooling fan, EFI)
Solenoid valves (EGR control, purge control, vent control, vacuum cut valve bypass or intake valve timing control
Fuel injectors
IACV-AAC valve or IACV-FICD valve.

NOTE: Applying battery voltage to the ECM without sufficient resistive load (normally supplied by an actuator) will cause an over-current condition to the ECM transistor resulting in instant, permanent damage to the ECM.

Fig 1: Electronic Concentrated Engine Control System Testing