How to Troubleshoot A/T Systems

How to Check for DTCs with the Honda Diagnostic System When the powertrain control module (PCM) senses an abnormality in the input or output systems, the D indicator (A) in the gauge control module (B) will usually blink. |

When the Honda Diagnostic System (HDS) is connected to the data link connector (DLC) (A) (located under the driver's side of the dash), it will indicate the diagnostic trouble code (DTC) when the ignition switch is turned ON (II) and the appropriate menu is selected.
NOTE: The illustration shows LHD model; RHD model 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 HDS to the DLC. (See the HDS user's manual for specific instructions.)

1. Turn the ignition switch ON (II), select A/T system, and observe the DTC in the DTCs MENU on the HDS screen.

1. Record all fuel and emissions DTCs, A/T DTCs, and freeze data.

1. 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).

1. Clear the DTC and data.

1. 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.

Symptom Troubleshooting Versus DTC Troubleshooting Some symptoms will not trigger diagnosis trouble codes (DTCs) or cause the D indicator to blink. If the malfunction indicator lamp (MIL) was reported on or the D indicator has been blinking, check for DTCs. If the vehicle has an abnormal symptom, and there are no DTCs stored, go to the Symptom Troubleshooting Index. Check the list of probable cause(s) for the symptom, in the sequence listed, until you find the problem. |

How to Check for DTCs with the SCS Mode (retrieving the flash codes) When the PCM senses an abnormality in the input or output system, the D indicator (A) in the gauge control module (B) will usually blink. |

When the D indicator has been reported on, connect the HDS to the DLC (A) (located under the driver's side of the dash). Turn the ignition switch ON (II), select SCS mode, then the D indicator will indicate the DTC. NOTE: The illustration shows LHD model; RHD model is symmetrical.
If the D indicator and the MIL come on at the same time, or if a driveability problem is suspected, follow this procedure:

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

1. Turn the ignition switch ON (II), select SCS mode, then observe the D indicator in the gauge control module. 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.

1. Record all fuel and emissions DTCs and A/T DTCs.

1. If there is a fuel and emissions DTC, first check the fuel and emissions system as indicated by the DTC (except DTC 70, DTC 70 means there is one or more A/T DTCs, and no problems were detected in the fuel and emissions circuit of the PCM).

1. Clear the DTC and data.

1. Drive the vehicle for several minutes under the same conditions as those indicated by the freeze data, and then recheck for 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. Pull back the carpet, and remove the passenger's console lower cover.

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

1. 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.

DTC Clear

1. Clear the DTC with the HDS while the engine is stopped.

1. Turn the ignition switch OFF.

1. Turn the ignition switch ON (II), and wait 30 seconds.

1. Turn the ignition switch OFF, and disconnect the HDS from the DLC.

PCM Reset

1. Reset the PCM with the HDS while the engine is stopped.

1. Turn the ignition switch OFF.

1. Turn the ignition switch ON (II), and wait 30 seconds.

1. Turn the ignition switch OFF.

1. Do the PCM idle learn procedure

OBD Status The OBD status shows the current system status of each DTC and all of the parameters. This function is used to see if the technician's repair was successfully finished. The results of diagnostic tests for the DTC are displayed as:

- PASSED: On board diagnosis is successfully finished.
- FAILED: On board diagnosis has finished but failed.
- NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the DTC.

PCM Updating and Substitution for Testing Special Tools Required Honda Interface Module (HIM) EQS05A35570 Use one of these procedures 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.
NOTE: Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF before completion, the PCM can be damaged.
How to Update the PCM
NOTE:

- To ensure the latest program is installed, update a PCM whenever the PCM is substituted or replaced.
- You cannot update a PCM with the program it already has. It will only accept a new program.
- Before you update the PCM, make sure the vehicle's battery is fully charged.
- To prevent PCM damage, do not operate any electrical system; audio system, brakes, air conditioning, power windows, sunroof, and door locks, during the update.
- If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data link connector (DLC). This will prevent PCM damage.

1. Connect the HDS to the DLC (A) located under the driver's side of the dash.
   NOTE: The illustration shows LHD model; RHD model is symmetrical.

1. Turn the ignition switch ON (II).

1. Select PGM-FI, then the INSPECTION MENU with the HDS.

1. Do the TP POSITION CHECK in the ETCS TEST.

1. If the HDS does not have the update function, disconnect the HDS from the vehicle and connect the Honda interface module (HIM).

1. If the software in the PCM is the latest, disconnect the HDS or the HIM from the DLC, and go back to the procedure that you were doing.
   If the software in the PCM is not the latest, do the PCM update procedure as described on the HIM label or in the PCM update system.

1. Do the PCM idle learn procedure.

1. Do the CKP pattern clear/pattern learn procedure.

How to Substitute the PCM

1. Connect the HDS to the DLC (A) located under the driver's side of the dash.

1. Turn the ignition switch ON (II).

1. Select PGM-FI, then the INSPECTION MENU with the HDS.

1. Do the TP POSITION CHECK in the ECTS TEST.

1. Turn the ignition switch OFF.

1. Jump the SCS line with the HDS.

1. Remove the PCM, then install a known-good PCM.

1. Open the SCS line with the HDS.

1. Turn the ignition switch ON (II).

1. Select PGM-FI, then the REPLACE ECM/PCM, WRITE DATA.

1. Rewrite the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.

1. Reset the PCM with the HDS.

1. Do the PCM idle learn procedure.

1. Do the CKP pattern clear/pattern learn procedure.

How to Remove and Install the PCM

1. Pull back the carpet, and remove the driver's and passenger's console lower cover.

1. Connect the HDS to the DLC.

1. Turn the ignition switch OFF.

1. Jump the SCS line with the HDS.

1. Disconnect PCM connectors.

1. Remove the two bolts, and remove the PCM.

1. 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. Turn the ignition switch OFF.

1. Connect the HDS to the DLC.

1. Turn the ignition switch ON (II).

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

1. Turn the ignition switch ON (II).

1. Start the engine in the P or N position, and warm it up to normal operating temperature (the radiator fan comes on).

1. To verify that the problem is repaired, test-drive the vehicle for several minutes at speeds over 50 km/h (31 mph) or in freeze data range.