1984 BMW 318I No Start, With Good Spark, But No Injector Pulse
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Tests/Procedures: Potential Causes: 1. At the L-Jetronic control module, check for battery voltage during cranking at pin number nine, grounds at pins five and 13, and an engine speed (ignition primary) signal at pin 1. 2. At the injectors, check for battery voltage during cranking on the Red/White wires, and for a ground pulse on the Brown/Yellow. 3. If there is power at the injectors but no ground pulse, check the wiring continuity to pin 12 of the L-Jetronic control module. 4. If the wiring is good from the injectors to the control module, the module itself is bad. LH-Jetronic Control Unit Wiring
Tests/Procedures: Potential Causes: 1. At the L-Jetronic control module, check for battery voltage during cranking at pin number nine, grounds at pins five and 13, and an engine speed (ignition primary) signal at pin 1. 2. At the injectors, check for battery voltage during cranking on the Red/White wires, and for a ground pulse on the Brown/Yellow. 3. If there is power at the injectors but no ground pulse, check the wiring continuity to pin 12 of the L-Jetronic control module. 4. If the wiring is good from the injectors to the control module, the module itself is bad. LH-Jetronic Control Unit Wiring
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