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Home >> Dodge and Ram >> 1984 >> Ramcharger AW150, 5.2 T, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 3.7L & 5.2L EFC System >> Testing >> Electronic Fuel Control System Tests >> Electronic Fuel Control Computer Test

Electronic Fuel Control Computer Test

  1. Connect a tachometer and set parking brake. Start engine, warm to normal operating temperature and maintain engine speed of 1500 RPM. DO NOT ground carburetor switch. Connect a voltmeter to duty cycle solenoid output wire going to carburetor (Green wire). Do not separate the solenoid connector from the wiring harness.
  2. Disconnect electrical connector at oxygen sensor and connect a jumper to a good ground. Engine speed should increase at least 50 RPM and voltmeter should indicate more than 9 volts.
  3. Hold jumper wire with 1 hand and with the other hand, touch the battery positive terminal with jumper wire. Engine speed should decrease at least 50 RPM and voltmeter should indicate less than 3 volts. If computer fails both tests, replace it. Reconnect oxygen sensor harness.
CAUTION: Before performing next test, ensure fuel control computer is operating properly.
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