D3 Switch Circuit Troubleshooting

1. Turn the ignition switch to ON (II).
2. Shift to D and select D3 driving mode by pressing the D3 switch, and watch the D3 indicator.

   Does the D3 indicator come on? 

   YES  -The system is OK at this time.

   NO  -Go to step 3.

3. Check the PGM-FI DTCs with the HDS.

   Are DTC U0028 or U0155 indicated? 

   YES  -Go to the indicated DTC's troubleshooting recheck.

   NO  -Go to step 4.

4. Turn the ignition switch to LOCK (0).
5. Disconnect the D3 switch/shift lock solenoid connector.
6. Check for continuity between D3 switch/shift lock solenoid connector terminals No. 1 and No. 2 while pressing the switch and when the switch is released.
   Fig 1: Checking Continuity Between D3 Switch/Shift Lock Solenoid Connector Terminals No. 1 And No. 2

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity while pressing the D3 switch, and no continuity when the D3 switch is released? 

   YES  -Go to step 7.

   NO  -Replace the D3 switch (see D3 SWITCH TEST/REPLACEMENT ).

7. Turn the ignition switch to ON (II).
8. Shift the shift lever to D.
9. Measure the voltage between D3 switch/shift lock solenoid connector terminals No. 1 and No. 2.
   Fig 2: Measuring Voltage Between D3 Switch/Shift Lock Solenoid Connector Terminals No. 1 And No. 2

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage? 

   YES  -D3 switch circuit is OK. Check for loose terminals.

   NO  -Go to step 10.

10. Measure the voltage between D3 switch/shift lock solenoid connector terminal No. 1 and body ground.
    Fig 3: Measuring Voltage Between D3 Switch/Shift Lock Solenoid Connector Terminal No. 1 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair open in the wire between D3 switch/shift lock solenoid connector terminal No. 2 and body ground (G451), or repair poor body ground (G451).

    NO  -Go to step 11.

11. Measure the voltage between PCM connector terminal D3 and body ground.

Fig 4: Measuring Voltage Between PCM Connector Terminal D3 And Body Ground

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage? 

YES  -Repair open or short in the wire between PCM connector terminal D3 and the D3 switch/shift lock solenoid connector.

NO  -Check for a short in the wire between PCM terminal D3 and the D3 switch/shift lock solenoid connector. Check for loose or poor connections at PCM connector terminal D3. If the wire and connections are OK, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ) and recheck.