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Home >> GMC >> 1988 >> Forward Control 4.8 T, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Code 45 - Rich Exhaust Indication >> Test Description

Test Description

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 45 is set when the O2 signal on circuit No. 412 remains below .7 volts for 50 seconds, the system is operating in "Closed Loop", time since engine start has been one minute or longer, and throttle angle is greater than 2% (about .2 volt above idle voltage).
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