COMPONENT LOCATION |
GENERAL DESCRIPTION |
The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and ESP control requests, to the Engine PCM(ECM & TCM) through CAN bus line.
The Engine PCM(ECM) performs fuel cut functions according to requests from the HECU and retards ignition timing by torque reduction requests.
The PCM(TCM) maintains current gear positions during ESP control time, in order not to increase power which causes a Kickdown shift.
DTC DESCRIPTION |
The HECU checks the CAN communcation lines for normal ESP control, and sets this code if an ECM message is not received within 500ms.
The HECU does not detect this code until 2 seconds after the IG KEY is turned to ON.
DTC DETECTING CONDITION |
Item | Detecting Condition | Possible cause | ||||||||
DTC Strategy |
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Enable Conditions |
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Fail Safe |
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DIAGNOSTIC CIRCUIT DIAGRAM |
TERMINAL AND CONNECTOR INSPECTION |
1. | Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. |
2. | Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. |
3. | Has a problem been found?
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SIGNAL CIRCUIT INSPECTION |
■ Open Check |
1. | Ignition “OFF” & Engine “OFF”. |
2. | Disconnect HECU and ECM connector. |
3. | Measure resistance between CAN HIGH terminal(LOW terminal) of the HECU harness connector and CAN HIGH terminal( LOW terminal) of the ECM harness connector.
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4. | Is the measured resistance within specifications?
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OMPONENT INSPECTION |
1. | Ignition “OFF” |
2. | Ignition “ON” & Engine “OFF”. |
3. | Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode. |
4. | Using a scantool, Clear DTC. |
5. | Select “Diagnostic Trouble Codes(DTCs)” mode again. |
6. | Are any DTCs present ?
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