This ECM Chart is for use with a digital voltmeter to further aid in diagnosis. The voltages you get may vary due to low battery or other reasons, but should be close. The ECM has 2 connectors: 1 24-pin (A&B) and a 32-pin (C&D)
The following conditions must be met before testing:
- Engine at operating temperature, Diagnostic terminal not grounded,
- Idling in closed loop (for "Eng. Run" column), ALDL tool not installed.
Key On |
Eng. Run. |
CIRCUIT
|
PIN |
WIRE
|
0* |
B+ |
Fuel Pump Relay |
A1 |
Green/Black |
B+ |
0*/B+ |
A/C Cluth Control |
A2 |
Light Green/Black |
B+ |
B+ |
Canister Purge Control |
A3 |
Green/Yellow |
B+ |
B+ |
EGR Control |
A4 |
Grey |
0* |
B+ |
"SES" Control |
A5 |
Brown/White |
B+ |
B+ |
IGN-ECM Fuse |
A6 |
Pink/Black |
B+ |
B+ |
TCC Control ALDL |
A7 |
Tan/Black |
4.3 |
varies 2-5 |
Serial Data ALDL |
A8 |
Orange |
5.0 |
5.0 |
Diagnostic Term ALDL |
A9 |
White/Black |
0* |
0* |
Speed Sensor Signal |
A10 |
Dark Brown |
0*/B+ |
B+ |
Cam Hi |
A11 |
Black |
0* |
0* |
Ground |
A12 |
Black/White |
. |
. |
Not Used |
B1 |
. |
. |
. |
Not Used |
B2 |
. |
0* |
0* |
Crank Reference Low |
B3 |
Black/Red |
0* |
0* |
EST Control |
B4 |
White |
0*/B+ |
B+ |
Crank Reference High |
B5 |
Purple/White |
2.50 |
2.48 |
MAF Sensor Signal |
B6 |
Yellow |
8.71 |
8.75 |
ESC Signal |
B7 |
Yellow/Black |
B+/0* |
B+/0* |
A/C Signal (On/Off) |
B8 |
Light Blue |
. |
. |
Not Used |
B9 |
. |
0* |
0* |
Park/Neutral Switch |
B10 |
Orange/Black |
. |
. |
Not Used |
B11 |
. |
B+ |
B+ |
Injector #5 |
B12 |
Black/White |
. |
. |
Not Used |
C1 |
. |
. |
. |
Not Used |
C2 |
. |
N/U |
N/U |
Idle Air Control B Lo |
C3 |
Green/Black |
N/U |
N/U |
Idle Air Control B Hi |
C4 |
Green/White |
N/U |
N/U |
Idle Air Control A Hi |
C5 |
Blue/White |
N/U |
N/U |
Idle Air Control A Lo |
C6 |
Blue/Black |
0* |
0* |
3rd Gear Signal |
C7 |
Green/White |
0* |
0* |
4th Gear Signal |
C8 |
Light Blue |
. |
. |
Not Used |
C9 |
. |
2.04 |
2.18 |
Coolant Temp. Signal |
C10 |
Yellow |
2.46 |
2.09 |
Mass Air Temp. Signal |
C11 |
Tan |
B+ |
B+ |
Injector #6 |
C12 |
Black/Yellow |
.36-.44 |
.36-.44 |
TPS Signal |
C13 |
Dark Blue |
5 |
5 |
TPS 5 volt Reference |
C14 |
Grey |
B+ |
B+ |
Injector #2 |
C15 |
Black/Green |
0* |
0* |
Battery 12 volts |
C16 |
Orange |
0* |
0* |
Ground |
D1 |
Black/White |
B+ |
B+ |
Low Speed Fan Control |
D2 |
Dark Green |
B+ |
B+ |
Wastegate Control |
D3 |
Pink/White |
. |
. |
Not Used |
D4 |
. |
4.56 |
4.56 |
Bypass |
D5 |
Tan/Black |
0* |
0* |
O2 Sensor Ground |
D6 |
Tan |
0* |
0* |
O2 Sensor Signal |
D7 |
Purple |
. |
. |
Not Used |
D8 |
. |
0* |
0* |
EGR Diagnostic |
D9 |
Purple/White |
0* |
0* |
Ground |
D10 |
Black/White |
. |
. |
Not Used |
D11 |
. |
0* |
0* |
TPS/CTS/MAT Ground |
D12 |
Black |
. |
. |
Not Used |
D13 |
. |
B+ |
B+ |
Injector #1 |
D14 |
Black |
B+ |
B+ |
Injector #3 |
D15 |
Black/Pink |
B+ |
B+ |
Injector #4 |
D16 |
Black/Red |