Initial Inspection and Diagnostic Overview
Checking the Diagnostic Trouble Code (DTC) with an OBD II Scan tool or Honda PGM Tester
When the PCM senses an abnormality in the input or output systems, the [D4] indicator light in the gauge assembly will blink. When the 16P Data Link Connector (DLC) (located behind the ashtray) is connected to the OBD II Scan Tool or Honda PGM Tester as shown, the scan tool or tester will indicate the Diagnostic Trouble Code (DTC) when the ignition switch is turned ON.
When the [D4] indicator light has been reported on, connect the OBD II Scan Tool conforming to SAE J1978 or Honda PGM Tester to the DLC (16P) behind the ashtray. Turn the ignition switch ON, and observe the DTC on the screen of the OBD II Scan Tool or Honda PGM Tester. After determining the DTC, refer to Diagnosis by Symptom.
NOTE: See the OBD II Scan Tool or Honda PGM Tester user's manual for specific instructions.
NOTES:
- 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.
- The PCM memory must be reset after reconnecting the battery or the BACKUP, RADIO fuse. Testing and Inspection
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.
When the [D4] indicator light has been reported on, connect the Service Check Connector with the special tool. Then turn the ignition switch ON 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 on blink equals 10 short blinks. Add the long and short blinks together to determine the code. After determining the code, refer to Diagnosis by Symptom.
NOTES:
- 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.
- The PCM memory must be reset after reconnecting the battery or the BACK UP, RADIO fuse. Testing and Inspection
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in SRS before performing repairs or service.
1. Remove the right door sill molding.
2. Pull the carpet back to expose the PCM.
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 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.
PCM Reset Procedure
1. Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
2. Turn the ignition switch OFF.
3. Remove the No. 56 BACK UP, RADIO fuse (7.5 A) from the under-hood fuse/relay box for 10 seconds to reset the PCM.
NOTES:
- The A/T control system memory cannot be cleared by using the OBD II Scan Tool or Honda PGM Tester; be sure to remove the BACK UP, RADIO fuse to reset the A/T control system memory.
- The PCM memory must be reset after reconnecting the battery or the BACKUP, RADIO fuse. Testing and Inspection
Final Procedure
NOTE: This procedure must be done after any troubleshooting.
1. Turn the ignition switch OFF.
2. Disconnect the OBD II Scan Tool or Honda PGM Tester from the Data Link Connector (16P), or remove the special tool from the Service Check Connector.
3. Reset the PCM.
4. Turn the ignition switch ON.
5. Enter the anti-theft code for the radio, then enter the customer's radio station presets.
6. Memorize the engine idle speed signal in the PCM. Testing and Inspection