Electrical Throttle and Governor Control System
GM 4.3L Engine ECU Diagnostics Tester Tools required • ECU Diagnostics Tester MCF-1101 and your Lift Truck Service Manual. • Inductive Tachometer • Digital Volt/Ohmmeter How to read error code flashes, when an error occurs 1. Turn the engine off. 2. Connect the Diagnostic Tester harness to the engine harness connector located near the distributor. 3. Move the toggle switch on tester MCF-1101 to the OFF position. 4. Turn the truck key switch to the ON position (the light on the tester MCF-1101 will flash continuously at 1 second intervals). 5. Flip the toggle switch on tester MCF-1101 to the ON position - Error codes will flash at 3 second intervals. If there are no errors, the light will continue to flash at 1 second intervals. 6. From the error code, determine the reason and result for the error from the following table. 7. Turn the key switch OFFand remove the diagnostic tool. How to clear the error history from the ECU. 1. Repeat Steps 1 and 2 above. 2. Move the toggle switch on tester MCF-1101 to the ON position. 3. Turn the truck key switch to the ON position (the light on tester MCF-1101 will flash continuously at 1 second intervals). 4. Turn the key switch OFF and remove the diagnostic tool.
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