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Emission Maintenance Warning Light

RESETTING

1987-88 Models
  1. Make sure the ignition key is OFF.
  2. Locate the sensor (above the right front corner of the glove box), and lightly push a Phillips screwdriver or small rod tool through the 0.2 inch (5mm) diameter hole with the sticker labeled "RESET'' and lightly press down and hold.
  3. While lightly holding the screwdriver or tool down, turn the ignition switch to the RUN position. The emission warning light will then light and should remain on for as long as the screwdriver is held down. Hold the screwdriver down for approximately 5 seconds.
  4. Remove the screwdriver or tool. The lamp should go out within 2–5 seconds, indicating that a reset has occurred. If the light remains on, begin again at Step 1. If the light goes out, turn the ignition off and go to the next Step.
  5. Turn the ignition to the RUN position. The warning light should illuminate for 2–5 seconds and then go out. This verifies that a proper reset of the module has been accomplished. If the light remains on, repeat the reset procedure.
1989-93 Models
B SERIES PICKUP

On Federal and Canadian vehicles, the Malfunction Indicator Light (MIL) will come on at 60,000-80,000 mile (96,500-128,700 km) intervals to indicate the need for scheduled maintenance of the emission control system.

Fig. 1: The MIL reset connectors are located under the dashboard, near the realay box

Fig. 2: At the recommended mileage, switch the reset connectors

On California vehicles, the MIL will come on any time an engine management input device malfunctions, indicating that service is necessary.

After the required service or maintenance has been performed, the MIL can be reset by changing the connector connections.

MPV

Federal and Canadian vehicles are equipped with a mileage sensor which is linked to the odometer. At every 80,000 miles (128,744 km), the mileage sensor will cause the Malfunction Indicator Light (MIL) to illuminate, indicating that the oxygen sensor must be replaced.

Fig. 3: After replacing the oxygen sensor, remove the instrument gauge cluster assembly and, on the back, reset the MIL by reversing the set screw position

After replacing the oxygen sensor, remove the instrument cluster and reset the MIL by reversing the position of the MIL set screw.

NAVAJO

All vehicles are equipped with a "CHECK ENGINE'' or warning light located on the instrument cluster. This light should come on briefly when the ignition key is turned ON, but should turn off when the engine starts. If the light does not come ON when the ignition key is turned ON or if it comes ON and stays ON when the engine is running, there is a malfunction in the electronic engine control system. After the malfunction has been remedied, using the proper procedures, the "CHECK ENGINE'' light will go out.

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