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Home/GMC/Sierra 2500/GMC Sierra 2500 (2012-2012)/Repair manual/Transfer Case - Mp 3023/3024 (nqh)/Circuit/System Testing
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Circuit/System Testing GMC Sierra 2500

Transfer Case - Mp 3023/3024 (nqh) ~302 words

Circuit/System Testing

  1. Remove key. Disconnect the X1 connector at the transfer case shift control switch (TCSCS).
  2. Door open, key ON, engine OFF.
  3. Using the L-BU probe J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4 and a good ground, such as the ground terminal of the EL-49742 harness, black terminal. If the voltage is less than the specified range, test the affected circuit for an open/high resistance, short to ground, or short to voltage. If all circuits and connections test normal, test the body control module (BCM) for proper operation.
  4. Using the L-BU probes J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4 and the AWD indicator control circuit, TSCSC X1 pin 7. If the voltage is less than the specified range, test the AWD indicator control circuit for an open/high resistance or short to power. If all circuits and connections test normal, test the TCCM for proper operation.
  5. Key OFF. Using the L-BU probe J 35616-64B, test for greater than 10 ohms between the indicator dimming control circuit, TCSCS X1 pin 4 and all other pins of the TCSCS X1. If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.
  6. Using the L-BU probe J 35616-64B, test for greater than 10 ohms between the 4WD HI indicator control circuit, TCSCS X1 pin 7 and all other pins of the TCSCS X1. If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.
  7. Test the TCSCS for proper operation.