DIAGNOSTIC TOOLS
The CCC system does not require special tools for diagnosis. A tachometer, dwell meter, test light, ohmmeter, digital voltmeter with 10 megohms impedance (minimum), vacuum pump, vacuum gauge and 6 jumper wires 6" long (1 wire with female connectors at both ends, 1 wire with male connectors at both ends, 4 wires with male and female connectors at opposite ends) are the only tools necessary for diagnosis.
A test light, rather than a voltmeter, must be used when indicated by a diagnostic chart.
Some brands of dwell meter are not compatible with General Motors CCC systems. If engine operation seems to change as meter is connected, remove dwell meter and use another type.
Note. Special "SCAN" testers can be used to read trouble codes and check voltages in the system. These tools can save a great deal of time, but are not required. Refer to tester manual for operating procedures.
ECM Terminal ID & Voltage Values (2.5L). Scheme 86
Scheme 86: ECM Terminal ID & Voltage Values (2.5L)
ECM Terminal ID & Voltage Values (2.8L). Scheme 87
Scheme 87: ECM Terminal ID & Voltage Values (2.8L)
ECM Terminal ID & Voltage Values (4.3L, 5.0L, 5.7L & 7.4L). Scheme 88
Scheme 88: ECM Terminal ID & Voltage Values (4.3L, 5.0L, 5.7L & 7.4L)
Astro & Safari 2.5L Wiring Diagram. Scheme 89
Scheme 89: Astro & Safari 2.5L Wiring Diagram
S-10 & S-15 2.5L Wiring Diagram. Scheme 90
Scheme 90: S-10 & S-15 2.5L Wiring Diagram
S-10 & S-15 2.8L Wiring Diagram. Scheme 91
Scheme 91: S-10 & S-15 2.8L Wiring Diagram
Astro & Safari 4.3L Wiring Diagram. Scheme 92
Scheme 92: Astro & Safari 4.3L Wiring Diagram
"G" Series 4.3L, 5.0L & 5.7L Wiring Diagram. Scheme 93
Scheme 93: "G" Series 4.3L, 5.0L & 5.7L Wiring Diagram
Blazer/Jimmy "C/K" & Suburban 4.3L/5.0/5.7L Wiring Diagram. Scheme 94
Scheme 94: Blazer/Jimmy "C/K" & Suburban 4.3L/5.0/5.7L Wiring Diagram
"P" Series (Parcel Delivery Van) 5.7L Wiring Diagram. Scheme 95
Scheme 95: "P" Series (Parcel Delivery Van) 5.7L Wiring Diagram
"C" & "K" Series 7.4L Wiring Diagram. Scheme 96
Scheme 96: "C" & "K" Series 7.4L Wiring Diagram
2.5L VIN "E" - Astro & Safari Component Locations. Scheme 97
Scheme 97: 2.5L VIN "E" - Astro & Safari Component Locations
4.3L VIN "Z" - Astro & Safari Component Locations. Scheme 98
Scheme 98: 4.3L VIN "Z" - Astro & Safari Component Locations
2.5L VIN "E" - "S/T" Series Truck Component Locations. Scheme 99
Scheme 99: 2.5L VIN "E" - "S/T" Series Truck Component Locations
2.8L VIN "R" - "S/T" Series Truck Component Locations. Scheme 100
Scheme 100: 2.8L VIN "R" - "S/T" Series Truck Component Locations
4.3L VIN "Z" - "C/K" Series Truck Component Locations. Scheme 101
Scheme 101: 4.3L VIN "Z" - "C/K" Series Truck Component Locations
5.0L VIN "H" & 5.7L VIN "K" - "C/K" Component Locations. Scheme 102
Scheme 102: 5.0L VIN "H" & 5.7L VIN "K" - "C/K" Component Locations
7.4L VIN "N" - "C/K" & "R/V" Series Truck Component Locations. Scheme 103
Scheme 103: 7.4L VIN "N" - "C/K" & "R/V" Series Truck Component Locations
4.3L VIN "Z" - "R/V" Series Truck Component Locations. Scheme 104
Scheme 104: 4.3L VIN "Z" - "R/V" Series Truck Component Locations
5.0L VIN "H" & 5.7L VIN "K" - "R/V" Component Locations. Scheme 105
Scheme 105: 5.0L VIN "H" & 5.7L VIN "K" - "R/V" Component Locations
4.3L VIN "Z" - "G" Series Van Component Locations. Scheme 106
Scheme 106: 4.3L VIN "Z" - "G" Series Van Component Locations
5.0L VIN "H"/5.7L VIN "K" "G" Series Van Component Locations. Scheme 107
Scheme 107: 5.0L VIN "H"/5.7L VIN "K" "G" Series Van Component Locations
7.4L VIN "K" - "P" Series Parcel Van Component Locations. Scheme 108
Scheme 108: 7.4L VIN "K" - "P" Series Parcel Van Component Locations
Computer Command Control System Schematic. Scheme 109
Scheme 109: Computer Command Control System Schematic
System Check Chart. Scheme 110
Scheme 110: System Check Chart
