Diagnostic Test

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN DTCs and perform the appropriate diagnostics before proceeding. Refer to the DTC INDEX article.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - Perform the STORED LOST COMMUNICATION DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .
  No
  - Go To 2
CHECK THE (A194) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the Drivetrain Control Module C1 and C2 harness connectors.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (A194) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (A194) Fused B(+) circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (F946) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
1. Using a 12-volt test light connected to ground, check the (F946) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F946) Fused Ignition Switch Output (Run-Start) circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z901) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z901) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (Z901) Ground circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D301) CAN C(+) BUS CIRCUIT FOR AN OPEN
1. Disconnect the Star Can C Dash C12 harness connector and perform the CAN C DASH STAR CONNECTOR REMOVAL process. Refer to STANDARD PROCEDURE .
2. Measure the resistance of the (D301) CAN C Bus (+) circuit between the Star Can C Dash C12 harness connector and the DTCM C1 harness connector.
  Is the resistances below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (D301) CAN C(+) Bus circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D302) CAN C(-) BUS CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D302) CAN C Bus (-) circuit between the Star Can C Dash C12 harness connector and the DTCM C1 harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL, REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (D302) CAN C(-) Bus circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .