WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL GENERAL DESCRIPTION 1–9. AUTODETECT FEATURE (V9A SOFTWARE) A. Retarder Retarder autodetect will countdown for a maximum of twenty-five ignition cycles while recording detections of a retarder. A retarder will be identified as present and the retarder autodetect logic will stop once it is detected for three consecutive ignition cycles. If the ignition cycle counter completes the twenty-five cycles before there are three consecutive detections of a retarder, the software will log that there is no retarder present and the retarder autodetect logic will stop. Autodetect for any given ignition cycle works as described in Paragraph 1–10. B.
Oil Level Sensor Oil level sensor autodetect will countdown for a maximum of twenty-five engine starts while recording detections of an oil level sensor. An oil level sensor will be identified as present and the oil level sensor autodetect logic will stop once it is detected for five consecutive engine starts. If the engine start counter completes the twenty-five cycles before there are five consecutive detections of an oil level sensor, the software will log that there is no oil level sensor present and the oil level sensor autodetect logic will stop. Autodetect for any given engine start cycle works as described in Paragraph 1–10. C.
Throttle Source (Also Applies to V9 Software) Throttle autodetect will increment a counter for a throttle source on each engine start during which that possible throttle source is detected. When the counter for any of the sources indicates five consecutive detections, the software will set a “confidence flag” to indicate that this is an available throttle source. Multiple throttle sources can be detected on a single engine start and multiple confidence flags can be set. There is no limit to the number of engine starts for autodetection of the throttle source until a confidence flag is set for a source.
Once a confidence flag is set for any one of the sources, a counter begins to countdown for fifteen additional engine starts. During the entire autodetect period, the software will use the highest priority source as the throttle source if multiple sources are detected before any confidence flags are set. Once a confidence flag is set, that source is used as the source for throttle signal. When the countdown period is completed, the software will use the highest priority throttle source having a confidence flag set and the autodetect logic will stop. D.
Engine Coolant Temperature Sensor Source Engine coolant temperature sensor autodetect will countdown for a total of twenty-five engine starts while recording detections of engine coolant temperature sources. A “confidence flag” will be set once a source is detected for five consecutive engine starts. Multiple sources detected before a confidence flag is set or multiple confidence flags will result in the highest priority source being used as the engine coolant temperature source. Multiple sources can be detected on a single engine start cycle. 1–10.
AUTODETECT FEATURE (V8, V8A, V9 SOFTWARE) Autodetect is active on the first 24 engine starts or a larger calibration number of engine starts, depending upon the component or sensor being detected (details follow in A through D below). Autodetect takes place within the first 30 seconds of each engine start monitored. Autodetect searches for the presence of the following transmission components or data inputs: Retarder Present, Not Present Oil Level Sensor (OLS) Present, Not Present Throttle Analog, J1939, J1587 Engine Coolant Temperature Analog, J1939, J1587 1–10 Copyright © 2001 General Motors Corp.