DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK THAT MIL IS ILLUMINATED
CHECK WHETHER MIL TURNS OFF
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
CHECK THAT MIL IS ILLUMINATED
CHECK THAT ENGINE STARTS
INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)
ECD SYSTEM (w/o DPF) - MIL Circuit
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually. When the ignition switch is first turned to ON, the MIL should be illuminated and should then turn off when the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK THAT MIL IS ILLUMINATED |
Perform troubleshooting in accordance with the table below.
Result| Condition | Proceed to |
| MIL remains on | A |
| MIL does not illuminate | B |
| 2.CHECK WHETHER MIL TURNS OFF |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Check if DTCs have been stored (). If DTCs are present, write them down.
Check that the MIL turns off.
| OK | |
| |
| REPAIR CIRCUITS INDICATED BY OUTPUT DTCS ()
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| 3.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Check that the MIL is not illuminated.
- OK:
- MIL is not illuminated.
Reconnect the ECM connector.
| 4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) |
Disconnect the ECM connector.
Disconnect the combination meter connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
for LHD| Tester Connection | Condition | Specified Condition |
| E8-12 (CHK) - A38-24 (W) | Always | Below 1 Ω |
for RHD| Tester Connection | Condition | Specified Condition |
| E8-12 (CHK) - A52-24 (W) | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
for LHD| Tester Connection | Condition | Specified Condition |
| E8-12 (CHK) or A38-24 (W) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| E8-12 (CHK) or A52-24 (W) - Body ground | Always | 10 kΩ or higher |
Reconnect the ECM connector.
Reconnect the combination meter connector.
Result| Result | Proceed to |
| OK (w/ Multi-information Display) | A |
| OK (w/o Multi-information Display) | B |
| NG | C |
| | REPLACE COMBINATION METER ASSEMBLY (w/ Multi-information Display) ()
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| | REPLACE COMBINATION METER ASSEMBLY (w/o Multi-information Display) ()
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| C | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.CHECK THAT MIL IS ILLUMINATED |
Check if the MIL is illuminated when the ignition switch is turned to ON.
| 6.CHECK THAT ENGINE STARTS |
Turn the ignition switch to ON.
Start the engine.
Result| Result | Proceed to |
| Engine starts | A |
| Engine does not start* | B |
- *: The intelligent tester cannot communicate with the ECM.
| | GO TO VC OUTPUT CIRCUIT ()
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| 7.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) |
See the combination meter troubleshooting procedure ().
Result| Result | Proceed to |
| NG | A |
| OK (w/ Multi-information Display) | B |
| OK (w/o Multi-information Display) | C |
| | REPLACE COMBINATION METER ASSEMBLY (w/ Multi-information Display) ()
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| | REPLACE COMBINATION METER ASSEMBLY (w/o Multi-information Display) ()
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| A | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM) |
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