Reading and Clearing Diagnostic Trouble Codes

When the Transmission Control Module (TCM) senses an abnormality in the input or output systems, the D4 Indicator Light in the Gauge Assembly will blink.





When the Service Check Connector (located under the dash on the passenger side) is connected with the Special Tool as shown, the D4 Indicator Light will blink the Diagnostic Trouble Code (DTC) when the Ignition Switch is turned on.

When the D4 Indicator Light has been reported on, connect the Service Check Connector with the Special Tool. Then turn on the Ignition Switch and observe the D4 Indicator Light.





Codes 1 through 9 are indicated by individual short blinks, codes 10 through 15 are indicated by a series of long and short blinks. One long blink equals 10 short blinks. Add the long and short blinks together to determine the code. After determining the code, refer to the Diagnosis By Symptom / Electrical System Symptom-to-Component Chart. Testing and Inspection

Some Sequential Multiport Fuel Injection (PGM-FI) problems will also make the D4 Indicator Light come on. After repairing the PGM-FI system, disconnect the BACK UP fuse (7.5 A) in the under-hood Fuse/Relay Box for more than 10 seconds to reset the TCM memory.

NOTE: Disconnecting the BACK UP fuse also cancels the radio anti-theft code, preset stations and the clock setting. Get the customer's code number and make note of the radio presets before removing the fuse so you can reset them.





CAUTION: All Supplemental Restraint System (SRS) Wire Harnesses are covered with yellow insulation. Before you disconnect any part of an SRS Wire Harness, connect the Short Connectors.

WARNING: WHENEVER THE IGNITION SWITCH IS "ON", OR HAS BEEN TURNED "OFF" FOR LESS THAN THREE MINUTES, BE CAREFUL NOT TO BUMP THE SRS UNIT; THE AIRBAGS COULD ACCIDENTALLY DEPLOY AND CAUSE DAMAGE OR INJURIES. FOR ADDITIONAL PRECAUTIONS, REFER TO AIRBAG ARMING/DISARMING.





Inspection For Failure Codes Requiring Use of Test Harness (O7LAJ-PT3O1OA)
1. Remove the Right Door Sill Molding.
2. Pull the carpet back to expose the TCM.
3. Remove the Engine Control Module (ECM) Cover mounting nuts and turn the TCM over.
4. Connect the Wire Harness to the Test Harness, and/or connect the Test Harness to the TCM according to the Troubleshooting Flowchart.

NOTE:
- Only the A and D Terminals of the Test Harness are used for Automatic Transmission (A/T) troubleshooting.
- Unless otherwise noted, use only the Digital Multimeter, KS-AHM-32-003 or equivalent, for testing.





TCM Reset Procedure
1. Turn the Ignition Switch "OFF".
2. Remove the No. 39 BACK UP fuse (7.5 A) from the under-hood Fuse/Relay Box for 10 seconds to reset the TCM.

NOTE: Disconnecting the No. 39 BACK UP fuse also cancels the radio anti-theft code, preset stations and the clock setting. Get the customer's code number and make note of the radio presets before removing the fuse so you can reset them.

Final Procedure

NOTE: This procedure must be done after any troubleshooting.

1. Remove the Special Tool from the Service Check Connector.
2. Reset the TCM.
3. Set the radio preset stations and clock setting.