Without Scan Tool

Checking the Diagnostic Trouble Code (DTC)
with the Service Check Connector and Special Tool
When the PCM 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 (II).
When the [D4] indicator light has been reported on, connect the Service Check Connector with the special tool. Then turn the ignition switch on (11) and observe the [D4] indicator light.










Codes 1 through 9 are indicated by individual short blinks. Codes 10 and above 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.






Some PGM-FI problems will also make the [D4], indicator light come on. After repairing the PGM-FI system, disconnect the BACK UP, RADIO fuse (10 A) in the under-hood fuse/relay box for more than 10 seconds to reset the PCM memory, then retest.
NOTE: Disconnecting the BACK UP, RADIO 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.
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS section (24) before performing repairs or service.
1. Remove the heater lower cover on the passenger's side.
2. Pull the carpet back to expose the PCM cover.
3. Remove the PCM cover mounting nuts, then turn the PCM over.






4. Inspect the circuit on the PCM 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 multi meter. 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.