DTC P0684
Precautions: General safety (00)
NOTE:
For identification of each cylinder, refer to Statement on Cleanliness and Care:D16AA.
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0684: Glow Plug Control Module to PCM Communication Circuit Range / Performance Invalid data is received from glow plug control module. (1 D/C detection logic but MIL does not light up) |
•Glow plug control module and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | C1: | Glow plug No.1 drive circuit | 3. | Glow plug No.1 |
| A1: | Glow plug control module power supply circuit | C2: | Glow plug No.2 drive circuit | 4. | Glow plug No.2 |
| A2: | Glow plug control module power supply circuit | C3: | Glow plug No.3 drive circuit | 5. | Glow plug No.3 |
| A3: | Glow plug control module ground circuit | C4: | Glow plug No.4 drive circuit | 6. | Glow plug No.4 |
| B1: | Glow plug control module drive circuit | 1. | ECM | ||
| B2: | Glow plug control module communication circuit | 2. | Glow plug control module |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Glow plug control module power supply circuit, ground circuit and communication circuit check
1)Check “A1”, “A2”, “A3” and “B2” circuits according to Step 2 – 6 of Glow Plug Operation Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
DTC recheck
1)Replace glow plug control module.
2)Clear DTC.
3)Set ignition “OFF”.
4)Check DTCs.
Is DTC P0684 still detected?
|
Replace ECM and recheck DTC.
|
End.
|