Honda Civic. Manual — part 266

Fig. 333: A/T Interlock System - Circuit Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.

SHIFT LOCK SYSTEM CIRCUIT TROUBLESHOOTING

1. Connect the HDS tot he DLC located behind the driver's dashboard lower

cover.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

2. Turn the ignition switch to ON (II). Make sure the HDS communicates with

the PCM. If it does not, go to the DLC circuit troubleshooting (see DLC
CIRCUIT TROUBLESHOOTING ).

3. Select Shift Lock Solenoid Test in the Miscellaneous Test Menu, and check

that the shift lock solenoid operates with the HDS.

Does the shift lock solenoid work properly?

YES -Go to step 15.

NO -Go to step 4.

4. Remove the center console (see CENTER CONSOLE

REMOVAL/INSTALLATION ).

5. Disconnect the shift lock solenoid connector.
6. Turn the ignition switch to ON (II).
7. Measure the voltage between shift lock solenoid connector terminal No. 1 and

body ground.

Fig. 334: Measuring Voltage Between Shift Lock Solenoid Connector
Terminal 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 8.

NO -Check for a blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box. If

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

the fuse is OK, repair open or short to body ground in the wire between the
shift lock solenoid connector and the under-dash fuse/relay box.

8. Shift to P, and press the brake pedal. Do not press the accelerator.
9. Measure the voltage between shift lock solenoid connector terminals No. 1 and

No. 2 while pressing the brake pedal.

Fig. 335: Measuring Voltage Between Shift Lock Solenoid Connector
Terminals 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 10.

NO -Go to step 11.

10. Release the brake pedal, and measure the voltage between shift lock solenoid

connector terminals No. 1 and No. 2. The shift lever must be in P.

Fig. 336: Measuring Voltage Between Shift Lock Solenoid Connector

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Terminals 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair short to body ground in the wire between PCM connector
terminal A27 and the shift lock solenoid.

NO -Check the shift lock mechanism. If the mechanism is OK, replace the shift
lock solenoid (see SHIFT LOCK SOLENOID REPLACEMENT ).

11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector A (44P).
14. Check for continuity between PCM connector terminal A27 and shift lock

solenoid connector terminal No. 2.

Fig. 337: Checking Continuity Between PCM Connector Terminal A27
And Shift Lock Solenoid Connector Terminal 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good PCM (see SUBSTITUTING THE PCM ) and
recheck.

NO -Repair open in the wire between PCM connector terminal A27 and the
shift lock solenoid connector.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)