Component Tests and General Diagnostics
Cruise Control Communication Circuit Troubleshooting (A/T)1. Start the engine.
2. Turn on the cruise control main switch, then drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set.
Does the cruise control operate?
YES - Go to step 3.
NO - Check the cruise control actuator.
3. Turn the ignition switch OFF.
4. Connect the Honda PGM Tester or the Honda Diagnostic System (HDS) to the data link connector (DLC). Turn the ignition switch ON (II), and jump the SCS line with the Honda PGM Tester or the HDS, then turn the ignition switch OFF.
NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
5. Disconnect PCM connector D (17P) and cruise control actuator 12P connector.
6. Check for continuity between PCM connector terminal D12 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between PCM connector terminal D12 and the cruise control actuator 12P connector terminal No. 10.
NO - Go to step 7.
7. Check for continuity between PCM connector terminal D12 and cruise control actuator 12P connector terminal No. 10.
Is there continuity?
YES - Go to step 8.
NO - Repair an open in the wire between PCM connector terminal D12 and cruise control actuator 12P connector terminal No. 10.
8. Reconnect the PCM connector D (17P) and the cruise control actuator 12P connector.
9. Disconnect the PGM Tester or the HDS.
10. Connect a voltmeter between PCM connector terminal D12 and body ground. Drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.
Is there about 1 V?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the system works properly, and the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.
NO - Substitute a known-good cruise control actuator, then recheck. If the system works properly, replace the original cruise control actuator.