Initial Inspection and Diagnostic Overview
Checking the Diagnostic Trouble Code (DTC) with an OBD II Scan Tool or the Honda PGM Tester
When the TCM 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 under the dash on the passenger side) is connected to the OBD II Scan Tool or Honda PGM Taster 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 confirming 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 Trouble Code Descriptions. Diagnostic Trouble Code Descriptions
NOTE: See the OBD II Scan Tool or Honda PGM Tester user's manual for specific instructions.
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 recheck.
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.
Checking the Diagnostic Trouble Code (DTC) with the Service Check Connector and Special 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 indicate (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 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. After determining the code, refer to Trouble Code Descriptions. Diagnostic Trouble Code Descriptions
Some PGM-FI problems will also make the [D4] indicator light come on. After repairing the PGM-FI system, disconnect the BACK UP fuse No. 47 (7.5 A) in the under-hood fuse/relay box for more than 10 seconds to reset the TCM memory, then recheck.
NOTE: Disconnecting the BACK UP fuse also cancels the radio anti-theft code, preset stations and the clock setting
1. Remove the two clips securing the kick panel, then remove the left side kick panel on the driver's side.
2. Remove the TCM and turn it over.
3. Inspect the circuit on the TCM according to the troubleshooting flowchart with the special tool and a digital multimeter as shown.
How to use the Backprobe Set
Connect the backprobe adapters to the stacking patch cords and connect the cord 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 until it comes in contact with the terminal end of the wire.
TCM Reset Procedure
1. Turn the ignition switch OFF.
2. Remove the No. 47 BACK UP fuse (7.5 A) from the under-hood fuse/relay box for 10 seconds to reset the TCM
NOTE:
- Disconnecting the No. 47 BACK UP fuse also cancels the radio anti-theft code, preset stations and 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 TCM memory cannot be cleared by using the OBD II Scan Tool or Honda PGM Tester; be sure to remove the BACK UP fuse to reset the TCM.
Final Procedure
NOTE: This procedure must be done after any troubleshooting.
1. Turn the ignition switch OFF.
2. Reset the TCM.
3. Disconnect the OBD II Scan Tool or Honda PGM Tester from the Data Link Connector or remove the special tool from the Service Check Connector.
4. Turn the ignition switch ON and Set the radio presets and clock setting.