DTC detecting condition | Trouble area |
---|---|
Transmission error that is inconsistent between transmission data and transmission monitor (CAN bus monitor) data is detected more than 7 times continuously.
(1 driving detection logic) |
•
ECM
• TCM • CAN communication line circuit |
Step | Action | YES | NO |
---|---|---|---|
1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
2 |
DTC check
1)
Connect scan tool to DLC with ignition switch turned OFF.
2)
Check ECM and TCM for DTC.
Is there any DTC(s) (other than DTC P1674, P1675, P1676 in ECM and DTC P1774, P1775, P1777 in TCM)?
|
Go to applicable DTC diag. flow.
|
Go to Step 3.
|
3 |
ECM and TCM connectors check
1)
Check for proper connection at each ECM and TCM connector terminals with ignition switch turned OFF.
2)
If connections are OK, recheck ECM for DTC with engine running.
Is there DTC P1674?
|
Go to Step 4.
|
Intermittent trouble. Check for intermittent referring to
Intermittent and Poor Connection Inspection
.
|
4 |
ECM power and ground circuit check
1)
Check for ECM power and ground circuit referring to
MIL Does Not Light with Ignition Switch ON and Engine Does Not Start Though It Is Cranked Up:M13A with VVT
.
Are they in good condition?
|
Go to Step 5.
|
Repair ECM power and/or ground circuits.
|
5 |
DTC check in TCM (bus off)
1)
Check DTC in TCM.
Is there DTC P1774 in TCM?
|
Go to Step 6.
|
Go to Step 7.
|
6 |
DTC check in ECM (bus off)
1)
Disconnect connectors from ECM with ignition switch turned OFF.
2)
Check TCM for DTC.
Is there DTC P1774 in TCM?
|
Go to Step 7.
|
Substitute a known-good ECM and recheck.
|
7 |
DTC check in ECM
1)
Connect connectors to ECM and disconnect connectors from TCM with ignition switch turned OFF.
2)
Check ECM for DTC.
Is there DTC P1674?
|
Go to Step 8.
|
Substitute a known-good TCM and recheck.
|
8 |
CAN communication line circuit insulation check
1)
Disconnect connectors from ECM with ignition switch turned OFF.
2)
Measure resistance between “E118-7” and “E118-8” terminals of ECM connector.
Is resistance infinity?
|
Go to Step 9.
|
Repair insulation of CAN communication line circuit referring to
Precaution for CAN Communication System
.
|
9 |
CAN communication line circuit continuity check
1)
Measure resistance at the following connector terminals.
•
Between “E118-8” terminal of ECM connector and “E121-17” terminal of TCM connector
• Between “E118-7” terminal of ECM connector and “E121-7” terminal of TCM connector
Is each resistance below 1 Ω?
|
Go to Step 10.
|
Repair open or high resistance of CAN communication line circuit referring to
Precaution for CAN Communication System
.
|
10 |
CAN communication line circuit ground short check
1)
Measure resistance at the following connector terminals.
•
Between “E118-8” terminal of ECM connector and vehicle body ground
• Between “E118-7” terminal of ECM connector and vehicle body ground
Is each resistance infinity?
|
Go to Step 11.
|
Repair shorted to ground of CAN communication line circuit referring to
Precaution for CAN Communication System
.
|
11 |
Check for short circuit of CAN communication line to power circuit
1)
Measure voltage at the following connector terminals with ignition switch turned ON.
•
Between “E118-8” terminal of ECM connector and vehicle body ground
• Between “E118-7” terminal of ECM connector and vehicle body ground
Is each voltage 0 – 1 V?
|
Substitute a known-good TCM and recheck. If DTC is still detected, substitute a known-good ECM and recheck.
|
Repair shorted to power supply of CAN communication line circuit referring to
Precaution for CAN Communication System
.
|