Diagnostic Test

CHECK FOR ENGINE CHARGING SYSTEM DTCS
1. With the scan tool, read Engine DTCs.
  Are there any Engine Charging System DTCs present?
  
  Yes
  - Repair any Charging System symptoms before proceeding. After repairing the Charging System, perform the Transmission Verification test to verify the transmission and or controller was not damaged. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 2
CHECK SYSTEM VOLTAGE
1. Start the engine.
2. With the scan tool, under transmission, check system voltage.
  Is the transmission system voltage above 9.0 volts?
  
  Yes
  - Go To 7
  No
  - Go To 3
CHECK THE (A1) B (+) CIRCUIT

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1. Turn the ignition off to the lock position.
2. Remove the Transmission Control relay.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check the (A1) B (+) circuit in the Transmission Relay connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (A1) B (+) circuit for high resistance.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
CHECK THE (F942) TRANSMISSION RELAY OUTPUT CIRCUIT

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1. Turn the ignition off to the lock position.
2. Remove the Transmission Relay.
3. Connect a jumper wire between the (A1) B (+) circuit and the (F2) Transmission Relay Output circuit in the Transmission Relay connector.
4. Start the engine.
5. With the scan tool, under transmission, check system voltage.
  Is the transmission system voltage above 9.0 volts?
  
  Yes
  - Replace the Transmission Relay.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (F942) FUSED TRANSMISSION RELAY OUTPUT CIRCUIT

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1. Turn the ignition off to the lock position.
2. Disconnect the TCM C1 harness connector.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check the (F942) Fused Transmission Relay Output circuit in the TCM C1 harness connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the (F942) Fused Transmission Relay Output circuit for high resistance. Make sure the check the fuse cavities.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
CHECK THE (Z912) GROUND CIRCUIT

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1. Turn the ignition off to the lock position.
2. Using a 12-volt test light connected to 12-volts, check the (Z912) Ground circuit in the TCM C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance to the Service Information. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL .
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Repair the (Z912) Ground circuit for high resistance.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
  Where there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Test Complete.