DTC P0564 for Chevrolet Epica 2008

Circuit Description

The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/ coast and resume/accelerate switch signal circuit in order to detect when a cruise control function has been requested. The ECM detects a specific voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit when a cruise control function switch is activated, with each switch having a different predetermined voltage value.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0564 Cruise Control Multi-Function Switch Circuit

Conditions for Setting the DTC

This DTC sets when the ECM detects an invalid voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit.

Action Taken When the DTC Sets

•	The malfunction indicator lamp (MIL) will illuminate.

•	The ECM will record operating conditions at the time the diagnostic fail.

•	This information will be stored in the Freeze Frame and Failure Records buffers.

•	A history DTC is stored.

Conditions for Clearing the MIL/DTC

•	The MIL will turn off at the end of a consecutive validation cycle in which the diagnostic runs without a fault.

•	A history DTC will clear after 40 warm up cycles without a fault

•	DTC(s) can be cleared by using the scan tool

Step	Action	Values	Yes	No
Schematic Reference: Refer to LINK
1	Did you perform the Diagnostic System Check - Vehicle?	--	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn OFF the ignition. Disconnect the cruise control switch connector. Turn ON the ignition, with the engine OFF. With a DMM, measure the voltage of the ignition 1 voltage circuit. Does the voltage measure at the specified value?	B+	Go to Step 3	Go to Step 7
3	Turn OFF the ignition. With a DMM, measure the resistance of the cruise control switch between the connector terminal 1 and the terminal 2, 3, 4 respectively, while pressing the cruise control switch ON and OFF. Do the cruise control function switch resistance values measure between the specified values?	Switch OFF=∞ Switch ON=0 ohms	Go to Step 4	Go to Step 5
4	Test the cruise control set/coast and resume/accelerate switch signal circuit for a high resistance, a short to voltage, or a short to ground between the cruise control switch and the engine control module (ECM). Did you find and correct the condition?	--	Go to Step 10	Go to Step 6
5	Inspect for poor connections at the connector of the multifunction switch. Did you find and correct the condition?	--	Go to Step 10	Go to Step 8
6	Inspect for poor connections at the harness connector of the ECM. Did you find and correct the condition?	--	Go to Step 10	Go to Step 9
7	Repair the high resistance in the ignition 1 voltage circuit. Did you complete the repair?	--	Go to Step 10	--
8	Replace the cruise control switch. Did you complete the repair?	--	Go to Step 10	--
9	Replace the ECM. Did you complete the replacement?	--	Go to Step 10	--
10	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Setting the DTC. Does the DTC reset?	--	Go to Step 2	System OK