A A TM03 227 1987 1991 LM E C M MODULE WIRING HARNESS LB4 4 3Z LU2 4 38 1 2 525 HARNESS ENGINE WIRING 1987 1988 1ST DES W 4 32 M TRNS 1 12070701 2 525 HARNESS ENGINE WIRING 1988 2ND DES W 4 32 M TRNS T 1 12070829 2 525 HARNESS ENGINEWIRING 1987 1988 IST DES W 4 32 A TRNS 1 12070702 I 2 525 HARNESS ENGINE WIRING 1988 2ND DES W 4 3Z A TRNS 1 12070830 2 525 HARNESS ENGINE WIRING 1989 W 4 32 M TRNS 12070717 I 2 525 IHARNESS ENGINE WIRING 1988 W 4 32 81 A TRNS NB2 12070827 2 525 HARNESS ENGINE WIRING 1988 W 4 3Z A TRNS NA5 NA6 L 12070828 2 525 HARNESS ENGINE WIRING 1989 W A TRNS 12070715 2 525 HARNESS ENGINE WIRING 1990 91 M W 4 3Z 4 38 C42 12097484 2 525 HARNESS ENGINE WIRING 1990 91 L W 4 3Z C42 12097466 2 525 HARNESS ENGINE WIRING 1990 91 M W 4 32 4 38 C60 12097478 2 525 HARNESS ENGINE WIRING 1990 91 L W 4 32 8 C60 12097469 2 3 671 RETAINER ENGINE WIRING HARNESS 12020307 3 N S MODULE ENGINE CONTROL SERVICEDBY THE FOLLOWING COMPONENTS V I A 3 670 CONTROLLER ENGINE CONTROL MODULE 18144288 V 3 870 CALPAK ENGINE CONTROL MODULE W 4 32 18051636 I 3 870 CALIBRATOR PROM 2 16147428 4 8 977 BOLT HEX W FLAT WASHER TAP M4 2X1 41X16 POR 11509374 5 3 671 HOUSING ELECTRIC FUEL CONTROL MODULE 15599065 6 3 871 RETAINER ELECTRIC FUEL CONTROL MODULE I 15599068 7 3 682 SENSOR EXHAUST OXYGEN 1987 8990625 3 882 SENSOR EXHAUST OXYGEN 1988 91 25105901 NOTE 1 1ST DESIGN HAS EXHAUST OXYGEN SENSOR IN EXHAUST MANIFOLD 2ND DESIGN IS IN FRT EXHAUST PIPE V NOTE 2 SEE PARTS CATALOG FOR ADDITIONAL USAGE RPO DEFINITIONS C42 HEATER DELUXE I C60 AIR CONDITIONING I NA5 FEDERAL EMISSIONS I I NA6 ALTITUDE EMISSIONS REQUIREMENTS A NB2 CALIFORNIA EMISSIONS A I I UWC ELECTRIC SPEEDOMETER I I 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52MI L 1 91 3 61 I 3 000 GROUP