911 3.2 ('84-'89) Basic Troubleshooting A Running Problem
 

911 3.2 ('84-'89) Basic Troubleshooting A Running Problem

1. With Key-Off - DME ECM disconnected
a. check for ground on pins; 2, 5, 16, 17, 19
b. check for ground on pin 3 with throttle at full open

2. With Key-On and engine not running and cold - DME ECM connected
a. check for 12V on pins; 1, 14, 15, 18, 20, 35
b. check for about 5V on pin 9
c. check AFM input pin 7 for about .80V to 4.7V, idle to throttle at full open
d. check O2 input pin 24 for about .50V
e. check temp sensor input pin 13 for greater than 1.5V

3. With engine running and warm at idle;
a. check fuel pressure; 30-35 psi (DME relay output pin 20 < 1.5V)
b. check AFM pin 7 for about .80V to 1.2V
c. check temp sensor pin 13 for less than 1.0V
d. check pin 24 (O2 sensor input) for a varying signal (.30 - .80 volts)

Note: All test points are on the DME ECM 35 pin connector, back-probing with the connector shell
removed or with a breakout box.

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