For a complete wiring diagram Refer to Section 8W.

Theory of Operation

Transmission damage may occur if there is insufficient supply voltage to properly control the solenoids. To prevent this possibility, the battery voltage is monitored and the system is placed in logical limp-in if the battery voltage drops below the limit.

• When Monitored:

  With the engine running and the PCM has closed the Transmission Control Relay.

• Set Condition:

  If the battery voltage of the Transmission Control Relay Output Sense circuit(s) to the PCM is less than 10.0 volts for the period of 15 seconds. Note: P0562 generally indicates a gradually falling battery voltage or a resistive connection(s) to the PCM. The DTC will also set if the battery voltage sensed at the PCM is less than 6.5 volts for 200ms or when Transmission Control Relay Output circuits are less than 7.2 volts for 200ms.

Diagnostic Test

NOTE: Generator, battery, and charging system must be fully functional before performing this test.

• Refer to the Transmission category and perform the appropriate symptom.

NOTE: This counter only applies to the last DTC set.

NOTE: Check connectors - Clean/repair as necessary.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

NOTE: The (T16) Transmission Control Output circuit branches off to both Transmission Solenoid/Pressure Switch Assembly, PCM and (if equipped) the Line Pressure Sensor/Variable Force Solenoid Assembly.