How to Troubleshoot CVT Systems

How to Check for DTCs with the Honda Diagnostic System/Scan Tool


When the powertrain control module (PCM) senses an abnormality in the input or output systems, the D indicator (A) in the gauge assembly (B) will usually blink.

NOTE: The illustration shows 6-position CVT+7Speed Mode; 6-position CVT is similar.

 

When the scan tool or Honda diagnostic system (HDS) is connected to the data link connector (DLC) (A) (located under the dash on driver's side), it will indicate the diagnostic trouble code (DTC) when the ignition switch is turned ON (II).

NOTE: The illustration shows the RHD model; LHD is symmetrical.

 

If the D indicator or malfunction indicator lamp (MIL) has been reported on, or if a driveability problem is suspected, follow this procedure:

1.Connect the scan tool or HDS to the DLC. (See the scan tool or HDS user's manual for specific instructions.)

2.Turn the ignition switch ON (II), and observe the fuel and emissions DTCs, A/T DTCs, and freeze data on the screen.

3.If there is a fuel and emissions DTC, first check the fuel and emissions system as indicated by the DTC (except for DTC P0700, DTC P0700 means there is one or more A/T DTCs, and no problems were detected in the fuel and emissions circuit of the PCM).

4.Clear the DTC and data.

5.Drive the vehicle for several minutes under the same conditions as those indicated by the freeze data, and then recheck for a DTC. If the A/T DTC returns, go to the DTC troubleshooting index. If the DTC does not return, there was an intermittent problem within the circuit. Make sure all pins and terminals in the circuit are tight.

How to Troubleshoot Circuits at the PCM


1.Remove the glove box cover and glove box.

2.Remove the passenger's lower cover, then remove the access cover.

3.Inspect the circuit on the PCM, according to the DTC troubleshooting, with a digital multitester (A) and tapered tip probe (B) as shown.

 

4.If you cannot get to the wire side of the connector or the wire side is sealed, disconnect the connector and use the tester probe to probe the connectors from the terminal side. Do not force the probe into the connector.

How to Clear A/T DTCs with Removing the fuse


1.Write down the radio presets.

2.Turn the ignition switch OFF.

3.Remove the No. 20 ECU fuse (15A) (A) from the under-dash fuse/relay box (B) for more than 10 seconds.

 

How to Clear A/T DTCs with the HDS


1.Connect the HDS to the DLC (A).

NOTE: The illustration shows the RHD model; LHD is symmetrical.

 

2.Turn the ignition switch ON (II).

3.Clear the DTC(s) on the HDS screen.

How to Remove and Install the PCM


1.Remove the glove box cover and glove box.

2.Remove the passenger's lower cover (A), side kick panel (B), and access cover (C).

NOTE: The illustration shows the RHD model; LHD is symmetrical.

 

3.Disconnect the connectors (D), and remove the mounting bolt and the PCM (E).

4.Install the PCM in the reverse order of the removal.

How to End a Troubleshooting Session


This procedure must be done after any troubleshooting.

1.Reset the PCM by removing the No. 20 ECU fuse (15A) from the under-dash fuse/relay box for more than 10 seconds, or clear the DTC(s) with the HDS.

2.Disconnect the scan tool or HDS.

3.Enter the radio code, reset the preset stations, and set the clock.

4.Do the PCM idle learn procedure, if the PCM has been replaced or updated.

5.Write the immobilizer code, if necessary.

6.Calibrate the feedback signal for the start clutch control.

7.To verify that problem is repaired, test-drive the vehicle for several minutes at speeds over 50 km/h (30 mph) or under the same conditions as in the freeze data.

PCM Updating and Substitution for Testing


Special Tools Required
Honda Interface Module (HIM) (  EQS05A35570)



Use this procedure when you have to substitute a known-good PCM in a troubleshooting procedure.
Update the PCM only if the PCM does not already have the latest software loaded.

Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF, the PCM can be damaged.

How to Update the PCM


NOTE:

1.Turn the ignition switch ON (II). Do not start the engine.

2.Connect the HIM to the DLC (A).

NOTE: The illustration shows the RHD model; LHD is symmetrical.

 

3.Update the PCM according to the procedures described on the HIM label. If the software in the PCM is the latest, replace the PCM.

How to Substitute the PCM


1.Remove the PCM.

2.Install a known-good PCM.

3.Write the immobilizer code with the PCM replacement procedure in the HDS; this will allow you to start the engine.

4.After completing your test, reinstall the original PCM and rewrite the immobilizer code with the PCM replacement procedure.