Diagnostic System Check - Engine Controls. Chevrolet Epica 2004

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2004 🢒 Epica 🢒 Transmission/Transaxle 🢒 Automatic Transmission - ZF 4HP 16 🢒 Diagnostic System Check - Engine Controls

Diagnostic System Check - Engine Controls Non European Emissions

Circuit Description

The diagnostic system check is an organized approach to identify a problem created by an electronic engine control system malfunction. If must be the starting point for any driveability complaint diagnosis because it directs the technician to the next logical step in diagnosing the complaint. Understanding the table and using it correctly will reduce diagnostic time and prevent the unnecessary replacement of parts.

Step	Action	Yes	No
1	Verify the customer complaints. Are the customer's complaints verified?	Go to Step 2	--
2	Turn ON the ignition. Is the malfunction indicator lamp (MIL) on steadily?	Go to Step 4	Go to Step 3
3	Jumper the data link connector (DLC) terminals 4, 5, and 6. Does the MIL flash code 12?	Go to Step 4	Go to Malfunction Indicator Lamp (MIL) Inoperative
4	Connect the scan tool to the DLC. Turn ON the ignition. Does the scan tool display serial data?	Go to Step 5	Go to Step 12
5	Start the engine. Does the engine start?	Go to Step 6	Go to Engine Cranks but Does Not Run
6	Turn the ignition to LOCK. Connect the scan tool to the DLC. Turn ON the ignition. Are any DTCs displayed?	Go to Step 8	Go to Step 7
7	Start the engine. Compare the scan tool data with typical values. Are the values normal or within the normal range?	Go to Step 9	Go to Step 10
8	Refer to the applicable DTC table. Start with the DTC with the lowest numerical value and move up. Are the DTCs identified as valid trouble codes?	Go to applicable DTC table	Go to Step 6
9	Are there any symptoms that have been identified?	Go to applicable DTC table	Go to Step 11
10	Identify the component that has a serial data value outside the normal range. Has the component been identified?	Go to Diagnostic Aids	--
11	Clear any DTCs from the ECM memory. Verify that the DTCs have been cleared. Road test the vehicle. Recheck for the presence of any DTCs. Is the repair complete?	System OK	Go to Step 1
12	Attach the scan tool to another vehicle. Turn ON the ignition. Does the scan tool read serial data?	Go to Step 13	Go to Step 16
13	Test for an open or short in the wire between ECM terminal D11 and the DLC connector 9. Is the problem found?	Go to Step 14	Go to Step 15
14	Repair the open or short as necessary. Connect the scan tool to the DLC. Start the engine. Does the scan tool display serial data?	System OK	Go to Step 15
15	Replace the electronic control module. Connect the scan tool to the DLC. Start the engine. Does the scan tool display serial data?	Go to Step 6	--
16	Replace the scan tool. Connect the scan tool to the DLC. Turn ON the ignition. Does the scan tool read serial data?	Go to Step 5	--

Diagnostic System Check - Engine Controls European Emissions

Description

The Diagnostic System Check-Engine Controls is an organized approach to identifying a condition that is created by a malfunction in the engine control system. The Diagnostic System Check must be the starting point for any driveability concern. The Diagnostic System Check directs the service technician to the next logical step in order to diagnose the concern. Understanding and correctly using the diagnostic table reduces diagnostic time and prevents the replacement of good parts.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step is for areas that have inspection and maintenance testing procedures for emissions testing. Use this step if the testing facility found one or more I/M system statuses that did not set.

Step

Action

Yes

Perform the following preliminary inspections:

•	Ensure that the battery is fully charged. Refer to Battery Inspection/Test in Engine Electrical.

•	Ensure that the battery cables are clean and tight.

•	Inspect the easily accessible systems or the visible system components for obvious damage or conditions that could cause the symptom.

•	Ensure that the engine and control module grounds are clean, tight, and in the correct location.

•	Inspect for aftermarket devices that could affect the operation of the system. Refer to Checking Aftermarket Accessories in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 2

Install a scan tool.
Turn ON the scan tool.

Does the scan tool turn ON?

Go to Step 3

Go to Scan Tool Does Not Power Up in Data Link Communications

Turn ON the ignition, with the engine OFF.
Attempt to establish communication with the Engine control module (ECM).

Does the scan tool communicate with the ECM?

Go to Step 4

Go to Scan Tool Does Not Communicate with Component in Data Link Communications

Attempt to start the engine.

Does the engine crank?

Go to Step 5

Go to Symptoms - Engine Electrical in Engine Electrical

Did the engine start and idle?

Go to Step 6

Go to Engine Cranks but Does Not Run

Important: Do NOT clear the DTCs unless instructed by a diagnostic procedure.

Select the DTC display function for the engine control module and record the DTCs.
If multiple powertrain DTCs are stored, diagnose the DTCs in the following order:

2.1.	Test for component level DTCs. For example, sensor DTCs, solenoid DTCs, and relay DTCs

Begin with the lowest number DTC unless the diagnostic table directs you otherwise.

2.2.	Test for system level DTCs. For example, misfire DTCs, EVAP system DTCs and fuel trim DTCs.

If there are any powertrain DTCs, Select Capture Info in order to store the Powertrain DTC information with a scan tool.

Does the scan tool display any DTCs?

Go to Step 7

Go to Step 10

Does the scan tool display DTCs P1601, P1607, P1650, P1655?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 8

Does the scan tool display DTCs P0601, P0602, or P0607?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 9

Does the scan tool display DTCs P0562 or P0563?

Go to DTC P0562 or DTC P0563 in Engine Electrical

Go to Diagnostic Trouble Code (DTC) List

Are there any TCM DTCs or any automatic transmission symptoms?

Go to Diagnostic System Check - Automatic Transmission in Automatic Transmission - Aisin (ZF 4HP 16)

Go to Step 11

Are there any engine controls or driveability symptoms observed?

Go to Symptoms - Engine Controls

System OK