Without TCS(Traction Control System), 4WD ECM recieves the signal directly from the wheel speed sensors. With TCS, 4WD ECM receives the signal through CAN communication line from TCS module which gets the wheel speed sensor signal from the sensors.
This DTC is about TCS module - ECM Communication Line and will set when there are no signals from the wheel speed sensors to 4WD ECM.
Item | Detecting Condition & Fail Safe | Possible Cause |
DTC Strategy | ● TCS-ITM Communication Line, or ECU side malfunction | ● ABS MODULE, 4WD ECM connector looseness and poor terminal to wire connection. ● Wheel sensor comm line circuit open/short. ● Wheel sensor malfunction. ● TCS MODULE malfunction. ● 4WD ECM malfunction. |
Enable Conditions | ● Message present 1.0 sec self clearing | |
Threshold Value | ● No Signal | |
Diagnostic Time | ● 1 Sec. | |
Fail safe |
Many malfunctions in the electrical system may be caused from poor harness and terminals. These faults can be caused by interference from other electrical systems and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to the next procedure.
Short to ground inspection
IG KEY OFF, ENG OFF
4WD ECM connector and TCS module: Disconnect.
Measure resistance between terminal 4 or 5 of 4WD ECM harness connector and chassis ground.
Specification : Approx. ∞Ω
Is resistance display near the specified value?
▶ Proceed next inspection procedure.
▶ Repair ground to short circuit.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
IG KEY OFF, ENG OFF
4WD ECM connector and TCS module: Disconnect.
Measure resistance between terminal 5 of 4WD ECM harness connector and terminal 11 of TCS control module harness connector.
Measure resistance between terminal 4 of 4WD ECM harness connector and terminal 10 of TCS control module harness connector.
Specification : Approx. ∞Ω
Is resistance display near the specified value?
▶ Replace with normal TCS control module temporarily and check if vehicle run normally.
If trouble is disappeared, replace TCS control module.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
▶ Repair open circuit.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
IG KEY ON, ENG ON
TCS module connector and 4WD ECM connector: Connect.
Clear the DTCs with a scan tool.
Start and drive vehicle in gear and maintain vehicle speed is approx. 10km/h or less(6mph or less).
Check TCS signals and verify the malfunction.
Does the scan tool display any DTC relevent to this signal?
▶ Go to the applicable troubleshooting procedure.
▶ System OK.
