Computers - Diagnostic Module Code Read-Out

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MB-NET ADMINISTRATIVE MESSAGE NOVEMBER 20, 1991 MESSAGE # 478


SUBJECT: GROUP 07 - DIAGNOSTIC MODULE READ-OUT, ENGINE M120


THE MALFUNCTION MEMORY OF THE DIAGNOSTIC MODULE CONTROL UNIT (N59) FOR CALIFORNIA VERSION M120 ENGINES HAS THE CAPABILITY TO INDICATE FAULTS FOR THE LEFT OR RIGHT CYLINDER BANKS. TO IDENTIFY FAULT CODES RELATING TO THE LEFT CYLINDER BANK, THE NUMBER 32 MUST BE SUBTRACTED FROM THE IMPULSE READOUT IF THE INDICATED READOUT IS A NUMBER HIGHER THAN 32.

SEE BELOW EXAMPLES OF IMPULSE READOUTS:

2: TEXT IN MANUAL: "02 SENSOR INOPERATIVE"
REFERS TO RIGHT BANK.

34: ACTUAL CODE 2 (IMPULSE READOUT 34-32 = CODE 2).
TEXT IN MANUAL: "02 SENSOR INOPERATIVE"
REFERS TO LEFT BANK.


12: TEXT IN MANUAL: "02 SENSOR HEATER, OPEN/SHORT CIRCUIT"
REFERS TO RIGHT BANK

44: ACTUAL CODE 12 (IMPULSE READOUT 44-32 = CODE 12).
TEXT IN MANUAL: "02 SENSOR HEATER, OPEN/SHORT CIRCUIT"
REFERS TO LEFT BANK


21: TEXT IN MANUAL: "PURGE SWITCHOVER VALVE, OPEN/SHORT CIRCUIT"
REFERS TO RIGHT BANK

53: ACTUAL CODE 21: (IMPULSE READOUT 53-32 = CODE 21).
TEXT IN MANUAL: "PURGE SWITCHOVER VALVE, OPEN/SHORT CIRCUIT"
REFERS TO LEFT BANK


SECTION 8 OF DIAGNOSTIC MANUAL ENGINES, VOLUME 2. WILL BE REVISED TO INDICATE THIS INFORMATION AS SOON AS POSSIBLE.