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Home >> Isuzu >> 1990 >> Trooper LS, 2.8 R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.8L >> Diagnostic Circuit Check >> Code 22: TPS Circuit (Signal Volt Lo) >> Notes

Code 22: TPS Circuit (Signal Volt Lo): Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 22 will set if the engine is running and TPS signal voltage is less than .2 volt for 3 seconds.
  2. This test simulates Code 21. If ECM recognizes the high signal voltage, ECM wiring is okay.
  3. This simulates a high signal voltage to check for an open circuit No. 417. What is important is that "Scan" tester recognizes the voltage change.
  4. There should be 5 volts at terminal "C" if measured with a voltmeter and ignition on.
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