Shift Lock System Circuit Troubleshooting

Press the brake pedal.
Are the brake lights ON?

YES - Go to step 2.

NO - Repair faulty brake light circuit.
Turn the ignition switch ON (II).
With the brake pedal depressed, check the BRAKE SWITCH INPUT in the ENGINE DATA list with the HDS.
Is ON indicated?

YES - Go to step 8.

NO - Go to step 4.
Turn the ignition switch OFF (0).
Jump the SCS line with the HDS.
Disconnect PCM connectors A (44P), B (44P), and C (44P).
Press the brake pedal, and measure the voltage between PCM connector terminals A8 and B43 or C40.

Fig 1: Measuring Voltage Between PCM Connector Terminals A8 And B43 Or C40
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Check PCM connector terminal A8 pin fit. If pin fit is OK, substitute a known-good PCM, then recheck. If the symptom/problem goes away with a known-good PCM, replace the original PCM.

NO - Repair open in the wire between PCM connector terminal A8 and the brake pedal position switch.
With the brake pedal depressed, check the SHIFT LOCK INPUT in the ENGINE DATA list with the HDS.
Is HIGH indicated?

YES - Go to step 11.

NO - Go to step 9.
Check the APP SENSOR-A input in the ENGINE DATA list with the HDS.
Is 11.0 % or 0.90 V or more with the accelerator pedal fully released?

YES - Go to step 10.

NO - Substitute a known-good PCM, then recheck. If the symptom/problem goes away with a known-good PCM, replace the original PCM.
Check the throttle cable adjustment (see THROTTLE CABLE ADJUSTMENT ).
Is it within specification?

YES - Check APP Sensor-A terminal pin fit, and repair if necessary. If the pin is OK, replace the APP Sensor (see APP SENSOR REPLACEMENT ).

NO - Adjust the cable or repair the throttle linkage.
Turn the ignition switch OFF (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (44P), B (44P), and C (44P).
Turn the ignition switch ON (II).
Measure the voltage between PCM connector terminals A2 and B43 or C40.

Fig 2: Measuring Voltage Between PCM Connector Terminals A2 And B43 Or C40
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 16.

NO - Go to step 17.
Jump PCM connector terminal A2 to body ground with a jumper wire.

Fig 3: Identifying PCM Connector Terminal A2 To Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the shift lock solenoid operate?

YES - Check PCM connector terminal A2 pin fit. If pin fit is OK, substitute a known-good PCM, then recheck. If the symptom/problem goes away with a known-good PCM, replace the original PCM.

NO - Check shift lock solenoid circuit pin fit. If pin fit is OK, replace the shift lock solenoid (see SHIFT LOCK SOLENOID REPLACEMENT ).
Remove the steering column upper and lower covers (see step 6 on REMOVAL ).
Disconnect the shift lock solenoid connector.
Measure the voltage between shift lock solenoid connector terminal No. 1 and body ground.

Fig 4: Measuring Voltage Between Shift Lock Solenoid Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 20.

NO - Check for a blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the driver's under-dash fuse/relay box and the shift lock solenoid connector.
Jump the shift lock solenoid connector terminals No. 1 and No. 2 with a jumper wire.

Fig 5: Identifying Shift Lock Solenoid Connector Terminals No. 1 And No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the voltage between PCM connector terminals A2 and B43 or C40.

Fig 6: Measuring Voltage Between PCM Connector Terminals A2 And B43 Or C40
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Replace the shift lock solenoid (see SHIFT LOCK SOLENOID REPLACEMENT ).

NO - Repair open in the wire between the shift lock solenoid connector and PCM connector terminal A2.