Data Link Connector: Testing and Inspection

DLC Circuit Troubleshooting

NOTE: If you suspect the HDS or the HDS DLC cable may be the source of the communication problem, verify that they are working properly by connecting them to a known-good, like vehicle and system, and checking for communication problems.

1. Turn the ignition switch to LOCK (0).

2. Connect the HDS to the DLC.

NOTE: Make sure the HDS is properly connected to the DLC.

3. Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?

YES -

Go to step 4.

NO -

Go to step 25.

4. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

Are any Pending or Confirmed DTCs indicated?

YES -

Go to the indicated DTC's troubleshooting.

NO -

- If the HDS does not communicate with the SRS, go to step 5.
- If the HDS does not communicate with the VSA system, go to step 7.
- If the HDS does not communicate with the TPMS, go to step 9.
- If the HDS does not communicate with the SH-AWD system, go to step 11.
- If the HDS does not communicate with the ACC system, go to step 13.
- If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 15.
- If the HDS does not communicate with the BODY ELECTRICAL system, go to step 17.

5. Turn the ignition switch to LOCK (0).

6. Turn the ignition switch to ON (II), and watch the SRS indicator.

Does the SRS indicator come on and go off?

YES -

Go to step 19.

NO -

Go to the SRS general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

7. Turn the ignition switch to LOCK (0).

8. Turn the ignition switch to ON (II), and watch the VSA indicator.

Does the VSA indicator come on and go off?

YES -

Go to step 19.

NO -

Go to the VSA system symptom troubleshooting for ABS indicator, brake system indicator, or VSA indicator do not go off Symptom Troubleshooting.

9. Turn the ignition switch to LOCK (0).

10. Turn the ignition switch to ON (II), and watch the TPMS indicator.

Does the TPMS indicator come on and go off?

YES -

Go to step 19.

NO -

Go to the TPMS symptom troubleshooting for TPMS indicator does not go off, and no DTCs are stored Initial Inspection and Diagnostic Overview.

11. Turn the ignition switch to LOCK (0).

12. Turn the ignition switch to ON (II), and watch the SH-AWD indicator.

Does the SH-AWD indicator come on and go off?

YES -

Go to step 19.

NO -

Go to the SH-AWD system symptom troubleshooting for SH-AWD indicator does not go off, and no DTCs are stored Initial Inspection and Diagnostic Overview.

13. Turn the ignition switch to LOCK (0).

14. Turn the ignition switch to ON (II), and watch the ACC indicator.

Does the ACC indicator come on and go off?

YES -

Go to step 19.

NO -

Go to the ACC general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

15. Turn the ignition switch to LOCK (0).

16. Turn the ignition switch to ON (II), and watch the immobilizer indicator.

Does the immobilizer indicator stay on or flash?

YES -

Go to the immobilizer system's troubleshooting Immobilizer System Description.

NO -

Go to step 19.

17. Do the gauge self-diagnostic function Testing and Inspection.

18. Check the gauge display.

Is Error 2 indicated?

YES -

Check for B-CAN system DTCs Reading and Clearing Diagnostic Trouble Codes.

NO -

Go to step 19.

19. Turn the ignition switch to LOCK (0), then do the battery terminal disconnection procedure Procedures, and wait at least 3 minutes before continuing.

20. Disconnect the HDS from the DLC.

21. Check for continuity between body ground and DLC terminals No. 1 and No. 7 individually.

Is there continuity?

YES -

Go to step 22.

NO -

Go to step 23.

22. Continue to check for continuity between body ground and DLC terminals No. 1 and No. 7 individually, while disconnecting these connectors, one at a time:

- SRS unit connector A (28P)
- VSA modulator-control unit 36P connector
- TPMS control unit connector B (20P)
- Immobilizer control unit-receiver 7P connector
- SH-AWD control unit connector A (26P)
- ACC (adaptive cruise control) unit 20P connector
- Driver's under-dash fuse/relay box connector P (30P)
- Keyless access control unit connector A (31P)

Does continuity go away when one of the above connectors is disconnected?

YES -

Replace the part that caused continuity go away when it was disconnected.

NO -

Repair a short in the wire between DLC terminal No. 7 (K-LINE) and the VSA modulator-control unit, the SRS unit, the TPMS control unit, the immobilizer control unit-receiver, the SH-AWD control unit, the ACC unit, and the driver's under-dash fuse/relay box, or between DLC terminal No. 1 (DIAG-H line) and the immobilizer control unit-receiver, or the keyless access control unit.

23. Connect DLC terminals No. 1 and No. 7 to body ground with jumper wires.

24. Check for continuity between body ground and the following connector terminals:

Is there continuity between body ground and each of the terminals in the chart?

YES -

Replace the part that does not communicate with the HDS.

NO -

Repair an open in the wire between the DLC (K-LINE and DIAG-H lines) and the appropriate connector.

25. Check for B-CAN system DTCs without the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC U0029 and/or U0100 indicated?

YES -

Go to step 37.

NO -

Go to step 26.

26. Turn the ignition switch to LOCK (0).

27. Disconnect the HDS from the DLC.

28. Measure the voltage between DLC terminal No. 16 and body ground.

Is there battery voltage?

YES -

Go to step 29.

NO -

Repair an open in the wire between DLC terminal No. 16 and the No. 7 BACK UP (10 A) fuse in the driver's under-dash fuse/relay box.

29. Measure the voltage between DLC terminals No. 4 and No. 16.

Is there battery voltage?

YES -

Go to step 30.

NO -

Repair an open in the wire between DLC terminal No. 4 and G501.

30. Connect the HDS to the DLC.

31. Jump the SCS line with the HDS.

32. Disconnect PCM connector A (49P).

33. Disconnect the HDS from the DLC.

34. Check for continuity between PCM connector terminal A48 and DLC terminal No. 6.

Is there continuity?

YES -

Go to step 35.

NO -

Repair an open in the wire between the PCM (A48) and DLC terminal No. 6.

35. Check for continuity between PCM connector terminal A49 and DLC terminal No. 14.

Is there continuity?

YES -

Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM Service and Repair.

NO -

Repair an open in the wire between the PCM (A49) and DLC terminal No. 14.

36. Try to start the engine.

Does the engine start and idle?

YES -

Go to the F-CAN circuit troubleshooting F-CAN Circuit Troubleshooting.

NO -

- If the starter does not crank, go to step 37.
- If the starter cranks, turn the ignition switch to LOCK (0), and go to step 39.

37. Turn the ignition switch to LOCK (0).

38. Check the No. 23 +B IG MAIN (50 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES -

Repair an open in the wire between the No. 23 +B IG MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 39.

NO -

Repair a short in the wire between the No. 23 +B IG MAIN (50 A) fuse and the ignition switch. Also replace the No. 23 +B IG MAIN (50 A) fuse in the under-hood fuse/relay box.

39. Check the No. 8 FI ECU (PCM) (15 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES -

Go to step 50.

NO -

Go to step 40.

40. Remove the blown No. 8 FI ECU (PCM) (15 A) fuse from the under-hood fuse/relay box.

41. Remove PGM-FI main relay 1 (A) from the driver's under-dash fuse/relay box.

42. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 4 individually.

Is there continuity?

YES -

Go to step 43.

NO -

Go to step 47.

43. Disconnect under-hood fuse/relay box connector D (9P).

44. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 4 individually.

Is there continuity?

YES -

Go to step 45.

NO -

Replace the under-hood fuse/relay box. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

45. Disconnect driver's under-dash fuse/relay box connector D (17P).

46. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 4 individually.

Is there continuity?

YES -

Replace the driver's under-dash fuse/relay box. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

NO -

Repair a short in the wire between the under-hood fuse/relay box and the driver's under-dash fuse/relay box. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

47. While disconnecting each of the parts or connectors below, one at a time, check for continuity between PGM-FI main relay 4P connector terminal No. 2 and body ground.

- PGM-FI main relay 2
- PCM connector B (49P)
- Each injector 2P connector
- CMP sensor 3P connector
- CKP sensor 3P connector
- MAF sensor/IAT sensor 5P connector
- ETCS control relay

Does continuity go away when one of the above parts or connectors is disconnected?

YES -

Replace the part that made the short to body ground go away when disconnected. If the part is the PCM, update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM is updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM Service and Repair. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

NO -

Go to step 48.

48. While disconnecting each of the parts or connectors below, one at a time, check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground.

- PGM-FI main relay 2
- PCM connector B (49P)
- Each injector 2P connector
- CMP sensor 3P connector
- CKP sensor 3P connector
- MAF sensor/IAT sensor 5P connector
- ETCS control relay

49. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground.

Is there continuity?

YES -

Repair a short in the wire between PGM-FI main relay 1 and each part. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

NO -

Replace the PGM-FI main relay 1. Also replace the No. 8 FI ECU (PCM) (15 A) fuse.

50. Check the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 60.

NO -

Go to step 51.

51. Remove the blown No. 19 FUEL PUMP (20 A) fuse from the driver's under-dash fuse/relay box.

52. Remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.

53. Test PGM-FI main relay 2 Testing and Inspection.

Is the relay is OK?

YES -

Go to step 54.

NO -

Replace PGM-FI main relay 2. Also replace the No. 19 FUEL PUMP (20 A) fuse.

54. Check for continuity between PGM-FI main relay 2 4P connector terminal No. 1 and body ground.

Is there continuity?

YES -

Go to step 55.

NO -

Go to step 58.

55. Jump the SCS line with the HDS.

56. Disconnect PCM connector B (49P).

57. Check for continuity between PCM connector terminal B42 and body ground.

Is there continuity?

YES -

Repair a short in the wire between the No. 19 FUEL PUMP (20 A) fuse and the PCM (B42), between the No. 19 FUEL PUMP (20 A) fuse and PGM-FI main relay 2, or between the No. 19 FUEL PUMP (20 A) fuse and the immobilizer control unit-receiver. Also replace the No. 19 FUEL PUMP (20 A) fuse.

NO -

Replace the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box, and update the PCM if it does not have the latest software PCM Update , or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM Service and Repair.

58. Disconnect the fuel pump control module 10P connector Service and Repair.

59. Check for continuity between fuel pump control module 10P connector terminal No. 3 and body ground.

Is there continuity?

YES -

Repair a short in the wire between the fuel pump control module and PGM-FI main relay 2. Also replace the No. 19 FUEL PUMP (20 A) fuse.

NO -

Replace the No. 19 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box, and substitute a known-good fuel pump control module, then recheck. If the symptom/indication goes away with a known-good fuel pump control module, replace the original fuel pump control module.

60. Jump the SCS line with the HDS.

61. Disconnect PCM connectors A (49P) and B (49P).

62. Turn the ignition switch to ON (II).

63. Measure the voltage between PCM connector terminal B42 and body ground.

Is there battery voltage?

YES -

Go to step 64.

NO -

Repair an open in the wire between the No. 19 FUEL PUMP (20 A) fuse and the PCM (B42).

64. Measure the voltage between PCM connector terminal A6 and body ground.

Is there battery voltage?

YES -

Go to step 70.

NO -

Go to step 65.

65. Turn the ignition switch to LOCK (0).

66. Remove PGM-FI main relay 1 (A) from the driver's under-dash fuse/relay box.

67. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 4 and body ground.

Is there battery voltage?

YES -

Go to step 69.

NO -

Replace the driver's under-dash fuse/relay box Drivers Under-Dash Fuse/Relay Box (MICU) Removal/Installation.

68. Connect PGM-FI main relay 1 4P connector terminal No. 3 to body ground with a jumper wire.

69. Check for continuity between PCM connector terminal A6 and body ground.

Is there continuity?

YES -

Test PGM-FI main relay 1 Testing and Inspection. If the relay is OK, update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM Service and Repair.

NO -

Repair an open in the wire between the PCM (A6) and PGM-FI main relay 1.

70. Turn the ignition switch to LOCK (0).

71. Remove PGM-FI main relay 1 (A) from the driver's under-dash fuse/relay box.

72. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 1 and body ground.

Is there battery voltage?

YES -

Go to step 74.

NO -

Replace the driver's under-dash fuse/relay box Drivers Under-Dash Fuse/Relay Box (MICU) Removal/Installation.

73. Connect PGM-FI main relay 1 4P connector terminal No. 2 to body ground with a jumper wire.

74. Check for continuity between PCM connector terminal B3 and body ground.

Is there continuity?

YES -

Go to step 75.

NO -

Repair an open in the wire between the PCM (B3) and the PGM-FI main relay 1.

75. Test PGM-FI main relay 1 Testing and Inspection.

Is PGM-FI main relay 1 OK?

YES -

Go to step 76.

NO -

Replace PGM-FI main relay 1.

76. Disconnect PCM connector C (49P).

77. Check for continuity between body ground and PCM connector terminals A41, B1, B40, B41, C1, and C41 individually.