Scan Tool Does Not Communicate with Keyword Data Line. Chevrolet Spark 2009

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Spark 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Scan Tool Does Not Communicate with Keyword Data Line

Circuit Description

The provisions for communicating with the engine control module (ECM), electronic brake control module (EBCM), SIR module, and the theft deterrent module are located in the data link connector (DLC). The DLC is located under the instrument panel (I/P). The 16 pin DLC for the Sirius application provides the serial data signals at terminals 7 (ECM serial data), 8 (theft deterrent serial data), 9 (ABS serial data), and 13 (SIR serial data). The 12 pin DLC for the Fenix provides the serial data signals at terminals C (ECM serial data), H (theft deterrent serial data), J (SIR serial data), and M (ABS serial data). The DLC is used to link a scan tool to the ECM, EBCM, SIR, and theft deterrent modules serial data stream. Some common uses of the scan tool are listed below:

•	Identifying the stored diagnostic trouble codes (DTC)

•	Reading the serial data stream

•	Clearing the DTCs

•	Storing the Freeze Frame data

Diagnostic Aids

Some scan tools may require an external power supply. Ensure the scan tool is correctly connected to the power feed.

Ensure that the correct application (model year, carline, VIN code) has been selected on the scan tool. If communications are still not established, try the scan tool on another vehicle in order to ensure that the scan tool or the connecting cables are not the cause of the malfunction. Always try the scan tool on a vehicle that uses the same DLC terminal for serial data communication.

Any circuitry that is suspect to an intermittent complaint should be thoroughly inspected for the following:

•	Backed-out terminals

•	Improper mating of terminals

•	Broken electrical connector locks

•	Improperly formed or damaged terminals

•	Faulty terminal-to-wiring connections

•	Physical damage to the wiring harness

•	A broken conductor inside the wire insulation

•	Corrosion of the electrical connections, the splices, or the terminals

Test Description

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

This step checks whether the scan tool can communicate with other control modules on the vehicle. If the scan tool can communicate with one of the other modules then the DLC connector, the shared circuits, and the scan tool are OK.

This step checks whether the ECM is receiving ignition positive voltage from the Main relay when the ignition is ON. The PCM cannot provide serial data without ignition positive voltage from the Main relay.

This step checks for a high resistance or open/short in the ECM serial data circuit.

This step checks the ECM/DLC Diagnostic circuit high resistance or open/short. This could cause the ECM not to communicate.

This step checks to see if the EBCM is not communicating with the scan tool.

This step checks to see if the SIR system is not communicating with the scan tool.

This step checks to see if the Theft Deterrent-Immobilizer system is not communicating with the scan tool.

Step	Action	Yes	No
Schematic Reference: Data Communication Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Does the scan tool power up?	Go to Step 3	Go to Scan Tool Does Not Power Up
3	Does the scan tool communicate with the engine control module (ECM)?	Go to Step 9	Go to Step 4
4	With the ignition OFF: Disconnect the ECM connector. Turn ON the ignition. Test the ECM battery positive (B+) and/or ignition voltage circuits with a test lamp connected to ground. Does the test lamp illuminate for all circuits?	Go to Step 5	Go to Step 24
5	With the ECM still disconnected, test the ECM ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all ground circuits?	Go to Step 6	Go to Step 24
6	Reconnect the ECM connector. Connect the scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool display serial data?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 7
7	Test the serial data circuit for an open, high resistance, or a short circuit. Refer to Circuit Testing . Did you find and correct the condition?	Go to Step 29	Go to Step 8
8	Test the data link connector (DLC) diagnostic circuit for an open, high resistance, or a short circuit. Refer to Circuit Testing . Did you find and correct the condition?	Go to Step 29	Go to Step 25
9	Does the scan tool communicate with the electronic brake control module (EBCM)?	Go to Step 14	Go to Step 10
10	Test the EBCM battery positive (B+) and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits?	Go to Step 11	Go to Step 24
11	Test the EBCM ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits?	Go to Step 12	Go to Step 24
12	Test the EBCM serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition?	Go to Step 29	Go to Step 13
13	Check the EBCM connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition?	Go to Step 29	Go to Step 26
14	Does the scan tool communicate with the SIR module?	Go to Step 19	Go to Step 15
15	Test the SIR module battery positive (B+) and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits?	Go to Step 19	Go to Step 24
16	Test the SIR module ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits?	Go to Step 17	Go to Step 24
17	Test the SIR serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition?	Go to Step 29	Go to Step 18
18	Check the SIR module connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition?	Go to Step 29	Go to Step 27
19	Does the scan tool communicate with the theft deterrent module?	Go to Step 29	Go to Step 20
20	Test the theft deterrent module battery positive (B+) and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits?	Go to Step 21	Go to Step 24
21	Test the theft deterrent module ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits?	Go to Step 22	Go to Step 24
22	Test the theft deterrent serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition?	Go to Step 29	Go to Step 23
23	Check the theft deterrent module connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition?	Go to Step 29	Go to Step 28
24	Repair the circuit as necessary. Refer to Wiring Repairs or Connector Repairs . Is the action complete?	Go to Step 29	--
25	Replace the ECM. Refer to Engine Control Module Replacement for the 0.8L engine, or Engine Control Module Replacement for the 1.0L engine. Is the action complete?	Go to Step 29	--
26	Replace the EBCM. Refer to Link in Antilock Brake System. Is the action complete?	Go to Step 29	--
27	Replace the SIR module. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the action complete?	Go to Step 29	--
28	Replace the theft deterrent module. Refer to Theft Deterrent Module Replacement . Is the action complete?	Go to Step 29	--
29	Operate the system in order to verify the repair. Is the action complete?	System OK	Go to Step 3