Test Point 23 Fuel Injectors Injection Timing Vq

Connect voltmeter on injector plug terminal 2 and ground with help of test leads. Turn on ignition. Disconnect 5-pin plug of fuel injector ballast resistors. Connect voltmeter between terminal 3 (terminal sleeve end) and ground. Turn on ignition. If battery voltage is displayed, turn off ignition and pull off all plugs on fuel injectors. Check power flow and resistance between the 5-pin plug of ballast resistors and terminal 2 of each fuel injector plug with an ohmmeter....

Diagnosable DME Control Unit

Self-diagnosis with a fault memory, with which it is possible to detect and store certain injection, ignition and knock regulating system faults, is integrated in the DME control unit of 944 S cars beginning with 1988 models. The DME control unit has a permanent positive connection to prevent cancellation of detected and stored faults by turning off the ignition. Detected faults remain stored in the memory for at least 50 engine starts exception idle speed switch interruption faults . If the...