C1605 CAN Hardware error - Automotive Repair Guides & Equipment

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 RAM for normal TCS control, and sets this code if a CAN RAM malfunction is detected.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

CAN RAM monitoring

Faulty HECU

Enable Conditions

CAN Hardware failure.

Fail Safe

Inhibit the ESP control and allow the ABS/EBD control.

The ESP warning lamp is activated.

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.

Has a problem been found?

	▶ Repair as necessary .
	▶ Go to “Component Inspection” Procedure.

COMPONENT INSPECTION

1.	Ignition “OFF” & Engine “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.

Are any DTCs present ?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU
	▶ Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared.

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