P0564 Cruise Control Multi-Function Input A Circuit - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The cruise control system keeps the vehicle running at a fixed speed until a signal canceling this fixed speed is received. When the ECM receives a signal from the CC control switch, the ECM controls the ETS motor to hold the vehicle at the current speed. The same circuit between the switches and the ECM is used for all switch functions. As a switch is pressed, the voltage changes on the signal wire. While the system is operating, the “CRUISE” indicator lamp in the instrument cluster lights up.

DTC DESCRIPTION

If the swich signal’s voltage is not within the calibrated ranges when ECM checks the switch signal under detecting condition, ECM sets P0564.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Monitors the status of the invalid input when the input voltage is converted to the switch input signals.

1.	Poor connection

2.	Open or short in cruise switch circuit

3.	Faulty cruise switch

4.	Faulty ECM

Enable Conditions

Engine is running

Ignition voltage ≥ 9V

Cruise control system type is learned

Threshold value

Invalid switch signal is monitored

Diagnosis Time

More than 7.8 seconds failure for 9.36 seconds test

MIL On Condition

NO MIL ON(DTC only)

SPECIFICATION

Item	Resistance(Ω)
ON/OFF switch	3.9 kΩ ± 5%
SET switch	220 Ω ± 5%
RESUME switch	910 Ω ± 5%
CANCEL switch	0 Ω ± 5%

DIAGNOSTIC CIRCUIT DIAGRAM

MONITOR GDS DATA

1.	Connect GDS to Data Link Connector(DLC).

IG “ON”.

3.	Select “DTC” button, and then Press “DTC Status” to check DTC’s information from the DTCs menu.

4.	Read “DTC Status” parameter.

Is parameter displayed “Present fault”?

	▶ Go to “Terminal and Connector inspection” procedure.
	▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary

TERMINAL AND CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness and terminals. 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 and go to “Verification of Vehicle Repair” procedure
	▶ Go to ” Power Circuit Inspection ” procedure.

POWER CIRCUIT INSPECTION

■ Check voltage

1.	IG “OFF” and disconnect Cruise switch connector.

IG “ON”

Measure voltage between power terminal of Cruise switch harness connector and chassis ground.

Approx. B+

Is the measured voltage within specification ?

	▶ Go to “Signal Circuit Inspection” procedure.
	▶ Repair open or short to ground in harness and go to “Verification of Vehicle Repair” procedure.

SIGNAL CIRCUIT INSPECTION

■ Check voltage

1.	IG “OFF” and disconnect Cruise switch connector.

IG “ON”

Measure voltage between signal terminal of Cruise switch harness connector and chassis ground.

Approx. 5V

Is the measured voltage within specification ?

	▶ Go to “Component Inspection” procedure.
	▶ Go to “Check short in harness” as follows.

■ Check short in harness

1.	IG “OFF” and disconnect Cruise switch connector and ECM connector.

2.	Measure resistance between signal and power terminals of Cruise switch harness connector.

Measure resistance between signal and ground terminals of Cruise switch harness connector.

Infinite

Is the measured resistance within specification ?

	▶ Go to “Check open in harness’ as follows.
	▶ Repair short in control harness and go to “Verification of Vehicle Repair” procedure.

■ Check open in harness

1.	IG “OFF” and disconnect Cruise switch connector and ECM connector.

Measure resistance between signal terminal of Cruise switch harness connector and cruise signal terminal of ECM harness connector.

Approx. below 1Ω

Is the measured resistance within specification ?

	▶ Go to “Component Inspection” procedure.
	▶ Repair open in harness

COMPONENT INSPECTION

■ Check auto cruise switch

1.	IG “OFF” and disconnect Cruise switch connector.

2.	Measure resistance between signal and ground terminals of Cruise switch connector with ‘RESUME’ switch depressed.(Component side)

Measure resistance between signal and ground terminals of Cruise remocon connector with each switch depressed.(Component side)

Specification :

Item	Resistance(Ω)
ON/OFF switch	3.9 kΩ ± 5%
SET switch	220 Ω ± 5%
RESUME switch	910 Ω ± 5%
CANCEL switch	0 Ω ± 5%

Is the measured resistance within specification ?

▶ Substitute with a known – good ECM and check for proper operation. If the problem is corrected, replace ECM and go to “Verification of Vehicle Repair” procedure.

There is a memory reset function on GDS that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others.

▶ Substitute with a known – good auto cruise switch and check for proper operation. If the problem is corrected, replace auto cruise switch

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