2001 CIVIC - Immobilizer System Troubleshooting

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1 Page 1 of CIVIC - Immobilizer System Troubleshooting 1. Turn the ignition switch ON (II) with a programmed key. 2. Check to see if the immobilizer indicator comes on. Does the indicator come on? YES - Go to step 3. Go to step Check the immobilizer indicator operation. Does the indicator come on for 2 seconds, then go off? YES - Go to step 4. Go to step Try to crank the engine. Does the starter motor operate? YES - Go to step Try to start the engine. Check the starter motor. Does the engine start? YES - If available, check the Status Log in the Immobilizer info with the HDS. If the Status Log is not available, the Immobilizer system is OK at this time. Do the symptom troubleshooting. 6. Check to see if the immobilizer indicator comes on and blinks. Does the indicator blink? YES - Go to step 24. Go to step Disconnect the 7P connector from the imobilizer control unit-receiver. 8. Check to see if the immobilizer indicator goes off. Does the indicator go off? YES - Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM. Go to step Turn the ignition switch OFF. 10. Remove the gauge assembly and disconnect gauge assembly connector B (22P). 11. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOARM) terminal and body ground. YES - Repair a short in the wire. Faulty immobilizer indicator, replace the gauge assembly.

2 Page 2 of Try to start the engine. Does the engine start? YES - Go to step 13. Go to step Turn the ignition switch OFF. 14. Disconnect the 7P connector from the immobilizer control unit-receiver. 15. Check for voltage between the immobilizer control unit-receiver 7P connector No. 7 (+B) terminal and body ground. Is there battery voltage? YES - Go to step 16. Faulty No. 9 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box. 16. Remove the gauge assembly and disconnect gauge assembly connector B (22P). 17. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOARM) terminal and gauge assembly connector B (22P) connector No. 1 terminal. YES - Faulty immobilizer indicator, replace the gauge assembly. Repair an open in the wire. 18. Turn the ignition switch OFF. 19. Disconnect the 7P connector from the immobilizer control unit-receiver. 20. Disconnect the ECM/PCM connector E (31P). 21. Attatch the ECM/PCM connector E (31P) No. 7 terminal to body ground with a jumper wire.

3 Page 3 of Turn the ignition switch ON (II). 23. Check for voltage between the immobilizer control unit-receiver 7P connector No. 6 (IG1) terminal and body ground. Is there battery voltage? YES - Go to step 24. Faulty No. 4 (10 A) fuse in the under-dash fuse/relay box. If the fuse OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box. 24. Turn the ignition OFF. 25. Check for continuity between the immobilizer control unit-receiver 7P connector No. 1 (LG3) terminal and body ground. YES - Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM. Repair an open in the wire. If the wire is OK, repair G Turn the ignition switch OFF. 27. Connect the HDS to the data link connector. 28. Turn the ignition switch ON (II). 29. Monitor the System Check in the immobilizer info with the HDS. Is immobilizer system normal? YES - Go to step 1. Go to step Verify the System Check display on the HDS. Harness short from the ECM/PCM to the immobilizer unit. (S-net line short) The communication was not good between the ECM/PCM and the immobilizer unit by the battery voltage low. The communication was not good between the immobilizer unit and the ECM/PCM by influence of some noise. Immobilizer unit failure ECM/PCM failure Does the HDS display the following information?

4 Page 4 of 5 YES - Go to step 31. Go to step Turn the ignition switch OFF. 32. Disconnect the 7P connector from the immobilizer control unit-receiver. 33. Disconnect the ECM/PCM connector E (31P) from the ECM/PCM. 34. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 (IMOCD) terminal and body ground. YES - Repair a short in the wire. Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM. 35. Verify the System Check display on the HDS. Blown fuse Harness open from the ECM/PCM and the immobilizer unit. The communication was not good between the ECM/PCM and the immobilizer unit by battery voltage low. The communication was not good between the immobilizer unit and the ECM/PCM by influence of some noise. Immobilizer unit failure ECM/PCM failure Does the HDS display the following information? YES - Go to step 36. Check the Possible Failures shown on the System Check display. 36. Turn the ignition switch OFF. 37. Disconnect the 7P connector from the immobilizer control unit-receiver. 38. Disconnect the ECM connector E (31P) from the ECM. 39. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 (IMOCD) terminal and ECM connector E (31P) No. 27 terminal. YES - Substitute a known-good immobilizer control unit-receiver and/or ECM. Repair an open in the wire.

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