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Home >> Pontiac >> 1990 >> Firebird Formula, 5.0 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V8 PFI >> Code 22: TPS Signal Volt Low >> Notes

Code 22: TPS Signal Volt Low: Notes

  1. Code 22 will set if TPS signal voltage is less than about .2 volt for 3 seconds and the engine running. This test confirms Code 22 is present.
  2. Simulates Code 21. If the ECM recognizes the high signal voltage and sets Code 21, the ECM and wiring are okay.
  3. With throttle closed, the TPS voltage reading should be at idle specification. See DIAGNOSTIC AIDS.
  4. This simulates a high signal voltage to check for an open in circuit No. 417.
  5. On some models a buffered 5-volt throttle position sensor reference circuit is shared by the MAP sensor. If either of these circuits is shorted to ground, a Code 22 will set. To determine if the MAP sensor is causing the Code 22, disconnect the MAP sensor and see if Code 22 is reset.
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