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Home >> Dodge and Ram >> 1987 >> Caravan Base, 2.2 C, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.2L Electronic Fuel Control CEC >> Diagnosis & Testing >> On-Board Diagnostics >> Sensor Test Mode
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Sensor Test Mode

  1. Run the system through the ATM Test Mode. Press and hold the ATM test button until the desired test code appears on the read-out box display. Release the ATM button. Move the Read/Hold switch to the "Hold" position.
    NOTE: Since sensor access codes are the same as some ATM test codes, the ATM test circuit will turn on before the Read/Hold switch is moved to the "Hold" position.
  2. The computer will now use the diagnostic read-out box to display the output of the selected sensor.
SENSOR TEST MODES

Mode Sensor Checked
91 O2 Sensor
92 Coolant Sensor
93 Cooling Fan Sensor
96 Speed Sensor