Component Tests and General Diagnostics
INSPECTION1. Disconnect the PCM connector.
2. Connect the SST 49 UNO1 127 104 pin Breakout Box, or equivalent.
3. Measure the voltage at each terminal with a voltmeter.
4. If any PCM terminal voltage is incorrect, check the related input or output devices and wiring. If no problem is found, replace the PCM. (Refer to above.)