Shift Lock System Circuit Troubleshooting

Press the brake pedal.
NOTE: Use the HDS to verify brake switch input.

Are the brake lights ON?
1. YES- Go to step 2.
2. NO- Repair faulty brake light circuit.
Connect the HDS. Check engine speed and throttle position in the A/T data list.
Is the engine speed at idle, and TPS about 0.5 V?
1. YES- Go to step 3.
2. NO- Repair engine speed or throttle position input.
Disconnect the O/D switch/shift lock solenoid connector (see SHIFT LOCK SOLENOID TEST/REPLACEMENT ).
Turn the ignition switch ON (II).
Measure the voltage between O/D switch/shift lock solenoid connector terminal No. 3 and body ground.

Fig 1: Measuring Voltage Between O/D Switch/Shift Lock Solenoid Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES- Go to step 6.
2. NO- Check for blown No. 10 fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the O/D switch/shift lock solenoid connector and the under-dash fuse/relay box.
Shift the shift lever into the P position, and press the brake pedal.
Measure the voltage between O/D switch/shift lock solenoid connector terminals No. 3 and No. 4 while pressing the brake pedal.

Fig 2: Measuring Voltage Between O/D Switch/Shift Lock Solenoid Connector Terminals No. 3 And 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES- Check the shift lock mechanism. If the mechanism is OK, replace the shift lock solenoid (see SHIFT LOCK SOLENOID TEST/REPLACEMENT ).
2. NO- Check for an open in the wire between PCM connector terminal E2 and shift lock solenoid connector. If the wire is OK, substitute a known-good PCM and recheck.