Troubleshooting (S4XA) (Honda Civic 5)

When the TCM detects a fault in the input or output systems, the [D4] indicator on the instrument cluster will flash.

When the diagnostic connector (located under the dashboard on the passenger side) connected to the special tool as shown. [D4] indicator will flash showing a trouble code (DTC) when the ignition switch is on (position II).

When the [D4] indicator lights up, connect the diagnostic connector to the special tool. Then turn the ignition switch to position (II) and observe the [D4] indicator.



Codes 1 through 9 are displayed as short flashes. Codes 10 through 15 are displayed as a series of long and short flashes. One long flash is equivalent to 10 short flashes. Add the long and short flashes together to determine the code. After determining the code, refer to the electrical system troubleshooting chart on pages 14-A-306 and A-307.



Some PGM-FI problems will also cause the [D4] indicator to come on. After repairing the PGM-FI system, disconnect the backup fuse (7.5A) in the underhood fuse/relay box for more than 10 seconds to reset the TCM memory, then test again.

Note: Removing the backup fuse will also reset the radio and clock. Note how the radio was set before removing the fuse so you can reset it correctly later.

1. Remove the driver's side flap.

2. Loosen the two mounting bolts and remove one mounting bolt.

3. Remove the TCM, then turn it over.



4. Check the TCM target according to the fault table using a digital tester and feeler gauge as shown.

Performing a re-check of the TCM.

1. Turn off the ignition

2. Remove the backup fuse No.46 (7.5A) from the underhood fuse and relay box for 10 seconds to clear the TCM memory.

Note: Removing the backup fuse will also reset the radio and clock. Note the radio readings before removing the fuse so you can reset them correctly later.

Final operation

Note: This operation must be performed after any malfunction.

1. Remove the special tool from the diagnostic connector.

2. Install the TCM.

3. Set the radio and clock.

Table of malfunction symptoms

Diagnostic Trouble Code (DTC): This is the number of times the [D4|] indicator flashes when the diagnostic connector is connected to the special tool (SCS - shorted connector).



Diagnostic Trouble Code (DTC): This is the number of times the [D4] indicator flashes when the diagnostic connector is connected to the special tools (SCS short connector).



If the self-diagnosis indicator [D4] does not flash, perform inspection according to the table.

Note:

• If the customer describes a symptom for code 3, although the [D4] indicator does not flash, 6 or 11, the symptom must be recreated by driving test, then recheck the DTC.
• Sometimes the [D4] indicator and the multi-function indicator lamp (MIL) may come on at the same time. If so, check the PGM-R system according to the DTC, then reset the memory by removing the backup fuse in the under-valve fuse and relay box for more than 10 seconds. Drive the vehicle for several minutes at speeds above 50 km/h, check the DTC again.
• Disconnecting the backup fuse also disables the radio and clock. Note how the radio was installed so that you can reinstall it later.