Engine Control Module

9224buick05

Bulletin: 91-6E-20

Date: June '91

Ref. No.: 91-223-6E

Corp. Ref. No.: 116516


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6E-A - ADDITIONAL TYPICAL VOLTAGES AND ECM CONNECTOR END VIEW CHARTS

MODELS AFFECTED:
ALL 1990-91 REGALS


Service technicians have commented about the inability to read typical voltages in the Electronic Control Module (ECM) Connector End View charts. These charts are located in Service Manual Section "6E-A", "Driveability And Emissions." This condition has led to development of new charts. Vehicles equipped with the ECM in the engine compartment require the use of sealed electrical connections. The practice of "backprobing," piercing insulation, or otherwise breaching the integrity of circuits for diagnostic purposes is strongly not recommended.

The charts may be used in conjunction with the T-100 *Yellow Breakout Box (48921) to obtain voltage values for each circuit listed. Furthermore, if the voltage is found to be abnormal, the technician may reference the appropriate section, chart, or figure within the service manual to enhance further diagnosis of the circuit in question.

* "We believe T-100 equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for, or assume responsibility for the products or equipment from those firms or for any such items which may be available from other sources."





3800 Brown Connector





3800 Purple Connector





3800 Red Connector





3800 Gray Connector





3.1L Connector A - Orange





3.1L Connector B - White





3.1L Connector C - Green





3.1L Connector D - Blue