Chart A1

If Codes EO22 and EO32 are stored, the cause is probably a loss of 5 volts to circuit No. 474, the 5-volt reference to MAP sensor and Throttle Position Sensor (TPS). To verify this condition, probe the following harness terminals with a voltmeter to ground: MAP sensor harness connector terminal "C" and TPS connector terminal "C".

If voltage is zero for both circuits, check circuit No. 474 for an open or short to ground. If wiring is okay, either the ECM connector or the ECM itself is faulty. If 5-volt reference signal is available on both sensor's terminals, go to the diagnostic chart for each individual code.