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Home >> Isuzu >> 1990 >> Trooper S, 2.6 E, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.8L >> Diagnostic Circuit Check >> Code 33: Map Sensor (Signal Volt Hi) >> Notes
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Code 33: Map Sensor (Signal Volt Hi): Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 33 will set when the signal is too high, for more than 5 seconds, TPS is less than 4 percent and vehicle speed is zero MPH. Engine misfire or a low unstable idle may set Code 33. Disconnect MAP sensor and system will go into back-up mode, using TPS signal to control fuel delivery.
  2. If ECM recognizes the low MAP signal, ECM and wiring are okay.
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