Pinpoint Test AD: DTC U300D:11
Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
Pinpoint Tests
Pinpoint Test AD: DTC U300D:11
Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information. Diagrams By Number
Normal Operation
The Transfer Case Control Module (TCCM) receives ignition switch position status from the hard-wired run/start input to TCCM pin 8 and the ignition switch position status message communicated by the Instrument Cluster (IC) over the High Speed Controller Area Network (HS-CAN). The ignition switch position status message originates from the Smart Junction Box (SJB) which communicates the ignition switch position status over the Medium Speed Controller Area Network (MS-CAN) to the IC which acts as a gateway module, transferring the ignition switch status message from MS-CAN to HS-CAN. For information regarding network messaging, refer to Information Bus.
- DTC U300D:11 (Ignition Input On/Start: No Sub Type Information) - If the ignition switch is not in RUN for the self-test, this code will set.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Ignition switch and/or circuitry
- HS-CAN
PINPOINT TEST AD: DTC U300D:11
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AD1 CARRY OUT NETWORK TEST
- Ignition ON.
- Connect the scan tool.
- Using the scan tool, carry out a Network Test.
- Did the Network Test pass?
Yes
GO to AD2.
No
REFER to Information Bus to diagnose the network concern.
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AD2 CHECK 4X4 INDICATOR PROVE-OUT
- Enter the following diagnostic mode on the scan tool: Self Test - TCCM.
- Carry out the TCCM self-test.
- Are any TCCM DTCs present?
Yes
For DTC U300D:11, GO to AD3. For all other DTCs, refer to the Transfer Case Control Module (TCCM) DTC Chart. Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
No
The system is functioning correctly.
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AD3 CHECK THE TCCM IGNITION SWITCH STATUS PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - TCCM.
- Monitor the following ignition switch PIDs while cycling the ignition through each position:
- Ignition Switch - Off/Unlock Position (IGN_O/U)
- ACC Position (IGN_A)
- Start Position 3 (IGN_S)
- Ignition Switch - Run/Start Position (IGN_R/S)
- Ignition Switch - Run Position (IGN_R)
- Do the ignition switch PIDs match the ignition switch positions?
Yes
The system is functioning correctly.
No
If the IGN_R/S PID did not match, CHECK SJB fuse 35 (10A). If the fuse is OK, REPAIR circuit CBP35 (YE/GY). CLEAR the DTCs. REPEAT the self-test.
If the IGN_O/U, IGN_A, IGN_S or IGN_R PIDs did not match, REFER to Steering Column to diagnose the ignition switch concern.
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