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Home >> Honda >> 2001 >> Prelude Type-SH L4-2157cc 2.2L DOHC (VTEC) MFI >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview

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 behind the right console front cover) 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 J19781 or Honda PGM Tester to the DLC (16P). 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.








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 (2P) (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 (2P) to 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

NOTE:
- Check the Malfunction Indicator Lamp (MIL) and repair the PGM-FI control system before repairing the A/T control system under these conditions:
- When the MIL and the [D4] indicator light come on simultaneously.
- When the [D4] indicator light does not indicate the DTC with the ignition switch is turned ON even though the [D4] indicator light has been reported on and the service check connector is connected with the special tool.
- After repairing the PGM-FI control 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.
- 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.

1. Remove the door sill molding on the passenger side.




2. Pull the carpet back to expose the ECM cover.
3. Remove the ECM cover mounting nuts, then turn the ECM over.




4. Remove the TCM from the ECM cover if necessary.
5. Inspect the circuit on the TCM according to the troubleshooting flowchart with the special tools and a digital multimeter.




How to use the Backprobe Set
Connect the backprobe adapters to the patch codes, 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.

TCM 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 BACK UP fuse (7.5 A) from the under-hood fuse/relay box for 10 seconds to reset the TCM.

NOTE: The A/T control system memory can also be cleared by using the OBD II Scan Tool or the Honda PGM Tester.

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 (2P).
3. Reset the TCM.
4. Turn the ignition switch ON.
5. Enter the anti-theft code for the radio, then enter the customer's radio station presets.
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