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Home >> Chevrolet >> 1988 >> Spectrum Express >> Repair and Diagnosis >> Engine Performance >> System >> 1.5L EFI Turbo >> Trouble Shooting >> Component Testing By Trouble Code >> Code 22 (TPS)
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Code 22 (TPS)

  1. Clear codes. Start engine and idle for one minute or until check engine light comes on. If light will not come on, problem is intermittent.
  2. If check engine light comes on, turn off engine. Jumper ALDL and turn ignition on. Note codes. If code 22 is present, turn off engine. Clear code and remove ALDL jumper.
  3. Disconnect TPS connector and jumper between Red and Light Green/Red wire connectors. Start engine and idle for one minute or until light comes on. Turn engine off. Jumper ALDL and turn ignition on. Note code.
  4. If code 21 is present, remove jumper wire and connect harness. Adjust TPS to proper specification. If TPS cannot be adjusted, replace TPS.
  5. If code 22 is present, remove jumper wire. Using a digital voltmeter, check voltage between Green and Light Green/Red wire terminals at TPS connector. With ignition on, reading should be 4-6 volts.
  6. If reading is above 6 volts, check TPS harness Red wire connector to ECM connector B13 for short or ground, faulty connection or bad ECM.
  7. If reading is below 4 volts, repeat step 6) for Light Green/Red harness connector and B14.
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