Data Link Connector: Testing and Inspection
DLC Circuit TroubleshootingNOTE: Make sure the HDS and the DLC cable of the HDS is normal.
1. Turn the ignition switch OFF.
2. Connect the HDS to the DLC.
NOTE: Make sure the HDS is properly connected to the DLC.
3. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES - Go to step 4.
NO - Go to step 21.
4. Check for Temporary DTCs or DTCs in the PGM-PI system with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II), and watch the SRS indicator.
Does the SRS indicator stay on?
YES - Go to the SRS system's general troubleshooting information.
NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Turn the ignition switch ON (II), and watch the ABS indicator.
Does the ABS indicator stay on?
YES - Go to the ABS system's general troubleshooting information.
NO - Go to step 9.
9. Turn the ignition switch OFF.
10. Turn the ignition switch ON (II), and watch the EPS indicator.
Does the EPS indicator stay on?
YES - Go to the EPS system's general troubleshooting information.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Turn the ignition switch ON (II), and watch the immobilizer indicator.
Does the immobilizer indicator stay on or flash?
YES - Go to the immobilizer system's troubleshooting.
NO - Go to step 13.
13. Do the gauge self-diagnostic function.
14. Check for B-CAN system DTCs without the HDS.
Are any B-CAN DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.
NO - Go to step 15.
15. Turn the ignition switch OFF.
16. Disconnect the HDS from the DLC.
17. Check for continuity between DLC terminal No. 7 and body ground.
Is there 5 Ohm or less?
YES - Go to step 18.
NO - Go to step 19.
18. Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these parts, one at a time:
- SRS unit connector A (28P)
- ABS modulator-control unit 25P connector
- EPS control unit connector D (28P)
- Immobilizer-keyless control unit 7P connector
- Audio unit 17P connector
- Under-dash fuse/relay box (Q) (16P) connector
Does continuity go away when one of the above components is disconnected?
YES - Replace the part that caused an open when it was disconnected.
NO - Repair short in the wire between the DLC (K-line) and the ABS modulator-control unit, the SRS unit, the EPS control unit, the immobilizer-keyless control unit, the audio unit, or the under-dash fuse/relay box.
19. Connect DLC terminal No. 7 to body ground with a jumper wire.
20. Check for continuity between body ground and these connector terminals:
Is there continuity between the DLC terminal and each of the terminals in the chart?
YES - Replace the unit which cannot communicate with the HDS.
NO - Repair open in the wire between the DLC (K-line) and the appropriate connector.
21. Do the gauge self-diagnostic function.
22. Check for B-CAN system DTCs without the HDS.
Is DTC B1168, B1169 and/or B1178 indicated?
YES - Go to step 35.
NO - Go to step 23.
23. Turn the ignition switch OFF.
24. Disconnect the HDS from the DLC.
25. Measure voltage between DLC terminal No. 16 and body ground.
Is there battery voltage?
YES - Go to step 26.
NO - Repair open in the wire between DLC terminal No. 16 and the No. 23 BACK UP (10 A) fuse in the under-hood fuse/relay box.
26. Measure voltage between DLC terminals No. 4 and No. 16.
Is there battery voltage?
YES - Go to step 28.
NO - Repair open in the wire between DLC terminal No. 4 and body ground (G502).
27. Connect the HDS to the DLC.
28. Jump the SCS line with the HDS.
29. Disconnect ECM connector A (44P).
30. Disconnect the HDS from the DLC.
31. Connect DLC terminal No. 6 to body ground with a jumper wire.
32. Check for continuity between ECM connector terminal A36 and body ground.
Is there continuity?
YES - Go to step 33.
NO - Repair open in the wire between the ECM (A36) and DLC terminal No. 6.
33. Connect DLC terminal No. 14 to body ground with a jumper wire.
34. Check for continuity between ECM connector terminal A37 and body ground.
Is there continuity?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair open in the wire between the ECM (A37) and DLC terminal No. 14.
35. Try to start the engine.
Does the engine start and idle smoothly?
YES - Go to F-CAN circuit troubleshooting.
NO - Go to step 36.
36. Turn the ignition switch OFF.
37. Check the No. 2 IG MAIN (50 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Repair open in the wire between the No. 2 IG MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 38.
NO - Repair short in the wire between the No. 2 IG MAIN (50 A) fuse and the under-hood fuse/relay box. Also replace the No. 2 IG MAIN (50 A) fuse.
38. Inspect the No. 19 FI MAIN (15 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Go to step 45.
NO - Go to step 39.
39. Remove the blown No. 19 F1 MAIN (15 A) fuse from the under-hood fuse/relay box.
40. Remove PGM-FI main relay 1 (C) from the under-hood fuse/relay box.
41. Check for continuity between body ground and PGM-FI main relay 1 C 4P connector terminals No. 1 and No. 3 individually.
Is there continuity?
YES - Replace the under-hood fuse/relay box. Also replace the No. 19 FI MAIN (15 A) fuse.
NO - Go to step 42.
42. Disconnect each of the components or connectors these components, one at a time, and check for continuity between PGM-FI main relay 1 C 4P connector terminal No. 2 and body ground.
- PGM-FI main relay 2 (FUEL PUMP)
- ECM connector A (44P)
- Each injector 2P connector
- Camshaft position (CMP) sensor B 3P connector
- Crankshaft position (CKP) sensor 3P connector
- Ignition coil relay
- Electronic throttle control system (ETCS) control relay
Does continuity go away when one of the above components is disconnected?
YES - Replace the component that made the short to body ground go away when disconnected. If the item is the ECM, update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. Also replace the No. 19 FI MAIN (15 A) fuse.
NO - Go to step 43.
43. Disconnect the all connectors from these components:
- PGM-FI main relay 2 (FUEL PUMP)
- ECM connector A (44P)
- Injectors
- Camshaft position (CMP) sensor B
- Crankshaft position (CKP) sensor
- Ignition coil relay
- Electronic throttle control system (ETCS) control relay (F)
44. Check for continuity between PGM-FI main relay 1 C 4P connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair short in the wire between PGM-FI main relay 1 C and each item. Also replace the No. 19 FI MAIN (15 A) fuse.
NO - Replace PGM-FI main relay 1 C. Also replace the No. 19 FI MAIN (15 A) fuse.
45. Inspect the No. 2 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 58.
NO - Go to step 46.
46. Remove the blown No. 2 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.
47. Jump the SCS line with the HDS.
48. Disconnect ECM connector C (44P).
49. Check for continuity between ECM connector terminal C36 and body ground.
Is there continuity?
YES - Go to step 50.
NO - Replace the No. 2 FUEL PUMP (15 A) fuse, and update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
50. Remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-dash fuse/relay box.
51. Check for continuity between ECM connector terminal C36 and body ground.
Is there continuity?
YES - Repair short in the wire between the No. 2 FUEL PUMP (15 A) fuse and the ECM (C36), between the No. 2 FUEL PUMP (15 A) fuse and PGM-FI main relay 2 (FUEL PUMP), or between the No. FUEL PUMP (15 A) fuse and the immobilizer control unit. Also replace the No. 2 FUEL PUMP (15 A) fuse.
NO - Go to step 52.
52. Remove the rear cushion.
53. Remove the rear floor upper cross-member, and the access panel from the floor.
54. Disconnect the fuel pump 4P connector.
55. Check for continuity between fuel pump 4P connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair short in the wire between the fuel pump and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 2 FUEL PUMP (15 A) fuse.
NO - Go to step 56.
56. Reinstall PGM-FI main relay 2 (FUEL PUMP) (A).
57. Check for continuity between fuel pump 4P connector terminal No. 2 and body ground.
Is there continuity?
YES - Replace PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 2 FUEL PUMP (15 A) fuse.
NO - Check the fuel pump, and replace it if necessary. Also replace the No. 2 FUEL PUMP (15 A) fuse.
58. Jump the SCS line with the HDS.
59. Disconnect ECM connectors A (44P) and C (44P).
60. Turn the ignition switch ON (II).
61. Measure voltage between ECM connector terminal C36 and body ground.
Is there battery voltage?
YES - Go to step 62.
NO - Repair open in the wire between the No. 2 FUEL PUMP (15 A) fuse and the ECM (C36).
62. Measure voltage between ECM connector terminal A6 and body ground.
Is there battery voltage?
YES - Go to step 67.
NO - Go to step 63.
63. Turn the ignition switch OFF.
64. Remove PGM-FI main relay 1 (C) from the under-hood fuse/relay box.
65. Measure voltage between PGM-FI main relay 1 C 4P connector terminal No. 3 and body ground.
Is there battery voltage?
YES - Go to step 66.
NO - Replace the under-hood fuse/relay box.
66. Check for continuity between PGM-FI main relay 1 C 4P connector terminal No. 4 and ECM connector terminal A6.
Is there continuity?
YES - Test PGM-FI main relay 1 C. If the relay is OK, update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair open in the wire between the ECM (A6) and PGM-FI main relay 1 C.
67. Turn the ignition switch OFF.
68. Remove PGM-FI main relay 1 (C) from the under-hood fuse/relay box.
69. Measure voltage between PGM-FI main relay 1 C 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES - Go to step 70.
NO - Replace the under-hood fuse/relay box.
70. Check for continuity between PGM-FI main relay 1 C 4P connector terminal No. 2 and ECM connector terminal A8.
Is there continuity?
YES - Go to step 71.
NO - Repair open in the wire between the ECM (A8) and PGM-FI main relay 1 C.
71. Test PGM-FI main relay 1 C.
Is PGM-FI main relay 1 C OK?
YES - Go to step 72.
NO - Replace PGM-FI main relay 1 C.
72. Disconnect ECM connector B (44P).
73. Check for continuity between body ground and ECM connector terminals B1, B36, C2, C40 and C44 individually.
Is there continuity?
YES - Go to step 74.
NO - Repair open in the wire between the ECM (B1, B36, C2,C40, C44) and G101.
74. Check for continuity between ECM connector terminal C13 and body ground.
Is there continuity?
YES - Go to step 75.
NO - Go to step 76.
75. Continue to check for continuity between ECM connector terminal C13 and body ground, while disconnecting the MAP sensor 3P connector.
Is there continuity?
YES - Repair short in the wire between the ECM (C13) and the MAP sensor.
NO - Replace the MAP sensor.
76. Check for continuity between ECM connector terminal B18 and body ground.
Is there continuity?
YES - Go to step 77.
NO - Go to step 78.
77. Continue to check for continuity between ECM connector terminal B18 and body ground, while disconnecting the output shaft (countershaft) speed sensor 3P connector.
Is there continuity?
YES - Repair short in the wire between the ECM (B18) and the output shaft (countershaft) speed sensor.
NO - Replace the output shaft (countershaft) speed sensor.
78. Check for continuity between ECM connector terminal C12 and body ground.
Is there continuity?
YES - Go to step 79.
NO - Go to step 80.
79. Continue to check for continuity between ECM connector terminal C12 and body ground, while disconnecting the throttle body 6P connector.
Is there continuity?
YES - Repair short in the wire between the ECM (C12) and the throttle body.
NO - Replace the throttle body.
80. Check for continuity between ECM connector terminal A25 and body ground.
Is there continuity?
YES - Go to step 81.
NO - Go to step 82.
81. Continue to check for continuity between ECM connector terminal A25 and body ground, while disconnecting the APP sensor 6P connector.
Is there continuity?
YES - Repair short in the wire between the ECM (A25) and APP sensor A.
NO - Replace the accelerator pedal module.
82. Check for continuity between ECM connector terminal A24 and body ground.
Is there continuity?
YES - Go to step 83.
NO - Go to step 84.
83. Continue to check for continuity between ECM connector terminal A24 and body ground, while disconnecting the APP sensor 6P connector.
Is there continuity?
YES - Repair short in the wire between the ECM (A24) and APP sensor B.
NO - Replace the accelerator pedal module.
84. Check over continuity between ECM connector terminal A19 and body ground.
Is there continuity?
YES - Go to step 85.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
85. Continue to check for continuity between ECM connector terminal A19 and body ground, while disconnecting these parts, one at a time:
- A/C pressure sensor 3P connector
- FTP sensor 3P connector
Does continuity go away when one of the above components is disconnected?
YES - Replace the part that caused an open when it was disconnected.
NO - Repair short in the wire between the ECM (A19) and the A/C pressure sensor or the FTP sensor.