Without Scan Tool

When the 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 (11).

When the D4 indicator light has been reported on, connect the Service Check Connector with the special tool. Then turn on (11) the ignition switch and observe the D4 indicator light.




Codes 1 through 9 are indicated by individual short blinks, codes 10 through 16 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 electrical system Diagnosis By Symptom / Symptom-to-Component Chart. Testing and Inspection

Some 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, then retest.

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 SRS wire harnesses are covered with yellow insulation. Before you disconnect any part of an SRS wire harness, disconnect the airbag connectors.
- Whenever the ignition switch is ON (11), or has been turned OFF for less than three minutes, be careful not to bump the SRS unit; the airbag(s) could accidentally deploy and cause damage or injuries.

1. Remove the right door sill molding.
2. Pull the carpet back to expose the TCM.




3. Remove the ECM cover mounting nuts, and turn the TCM over.




4. Inspect the circuit on the TCM according to the troubleshooting flowchart with the special tools and a digital multimeter as shown.

How to use the Backprobe Set
Connect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter. Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it comes in contact with the terminal end of the wire.