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8. (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly har- Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes >> Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage. Perform 42RLE TRANSMISSION VERIFICATION TEST - No >> Go To 9 9. TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/Pressure Switch Assembly har- Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. Using a 12-volt test light connected to ground, check (T16) Transmis- NOTE: The test light must illuminate brightly. Compare the bright- Does the test light illuminate brightly? Yes >> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or 21 - 562 AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS LX |