Was the Data Link Communications Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Data Link Communications

Attempt to establish communication with the other modules connected to the circuit.

Does the scan tool communicate with the other modules?

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Go to Step 10

Go to Step 20

1. Disconnect the power steering control module (PSCM) connector.
2. Measure the resistance between the PSCM connector terminal 1 and the data link connector (DLC) terminal 12.

Does the resistance measure less than the specified value?

.5 ohms

Go to Step 5

Go to Step 6

1. Disconnect the EBTCM connector.
2. Attempt to communicate with the other modules.

Does the scan tool communicate with the other modules?

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Go to Step 7

Go to Step 8

Inspect for poor connections at terminal 1. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Did you find and correct the poor connection condition?

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Go to Step 9

Go to Step 11

Locate and repair an open in CKT XM88 (BRN/WHT).

Is the repair complete?

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Go to Step 9

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Replace the EBTCM.

Is the replacement complete?

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Go to Step 9

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1. Reconnect the EBTCM.
2. Disconnect connector C1 from the heater and A/C control.
3. Attempt to communicate with the other modules.

Does the scan tool communicate with the other modules?

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Go to Step 12

Go to Step 13

Attempt to establish communications with the PSCM.

Does the scan tool communicate with the PSCM?

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System OK

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1. Inspect the FLASHER fuse for an open.
2. Inspect and test the PSCM ignition feed circuit at terminal 6 for proper voltage with the KEY ON (11-13 V).
3. Inspect and test the PSCM ground circuit (CKT F88) at terminal 8.
4. Make necessary repairs.

Did you find and correct any conditions?

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Go to Step 9

Go to Step 3

Replace the PSCM.

Is the replacement complete?

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Go to Step 9

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Replace the heater and A/C control.

Is the replacement complete?

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Go to Step 9

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1. Reconnect the heater and A/C control.
2. Disconnect the PSCM connector.
3. Attempt to communicate with the other modules.

Does the scan tool communicate with the other modules?

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Go to Step 11

Go to Step 14

1. Reconnect the PSCM.
2. Disconnect the SIR module connector.
3. Attempt to communicate with the other modules.

Does the scan tool communicate with the other modules?

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Go to Step 15

Go to Step 16

Replace the SIR module.

Is the replacement complete?

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Go to Step 9

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1. Disconnect each module on the serial data circuit (DLC terminal 12).
2. Test the serial data circuit, of the DLC, for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.
3. Test between terminal 12 and the following terminals at each module:

•	EBTCM connector terminal 11

•	Heater and A/C Control connector C1 terminal 17

•	SIR Module terminal 12

•	PSCM connector terminal 1

Did you find a short to ground in the serial data circuit?

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Go to Step 17

Go to Step 18

Locate and repair the short to ground in the serial data circuit.

Is the repair complete?

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Go to Step 9

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Test the serial data circuit, of the DLC, for a short to voltage between terminal 12 and each module. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.)

Did you find a short to voltage in the serial data circuit?

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Go to Step 19

Go to Step 21

Locate and repair the short to voltage in the serial data circuit.

Is the repair complete?

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Go to Step 9

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1. Turn Off the ignition.
2. Disconnect the scan tool from the data link connector (DLC).
3. Inspect for poor connections/terminal tension at the DLC terminal 12. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Did you find and correct a poor connection condition?

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Go to Step 2

Go to Step 4

Test the serial data circuit, of the DLC, for an open between terminal 12 and each module. Refer to Testing for Continuity in Wiring Systems.

Did you find an open in the serial data circuit?

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Go to Step 9

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