Ford Ranger Maintaince And Repair Manual page 588

(DTC's) are two or three digit numbers, and can be read through the use of a scan tool, an analog voltmeter, or
with the Malfunction Indicator Lamp (MIL) located on the instrument cluster. Use the accompanying OBD−I
DTC charts to decipher the DTC's for the identification of the malfunctioning component or circuit.
Scan Tool Method
1. Connect the scan tool to the self−test connectors. Make certain the test button is unlatched or up.
2. Start the engine and run it until normal operating temperature is reached.
3. Turn the engine OFFand wait 10 seconds.
4. Activate the test button on the STAR tester.
5. Turn the ignition switch ONbut do not start the engine.
6. The codes will be transmitted. Six to nine seconds after the last code, a single separator pulse will be
transmitted. Six to nine seconds after this pulse, the codes from the Continuous Memory will be
transmitted.
7. Record all service codes displayed. Do not depress the throttle during the test.
8. Afdter the test, compare the DTC's retrieved with the accompanying OBD−I code identification charts
in the Specifications Charts.
Analog Voltmeter Method
In the absence of a scan tool, an analog voltmeter may be used to retrieve stored fault codes. Set the meter
range to read DC 0−15 volts. Connect the positive lead of the meter to the battery positive terminal and
connect the negative lead of the meter to the Self−Test Output (STO) pin of the diagnostic connector.
Follow the directions given previously for performing the scan tool procedure. To activate the procedure, use
a jumper wire to connect the signal return pin on the diagnostic connector to the self−test input connector. The
self−test input line is the separate wire and connector with or near the diagnostic connector.
The codes will be transmitted as groups of needle sweeps. This method may be used to read either 2 or 3 digit
codes. The Continuous Memory codes are separated from the other codes by 6 seconds, a single sweep and
another 6 second delay.
1. After the test, compare the DTC's retrieved with the accompanying OBD−I code identification charts
in the Specifications Charts.
Malfunction Indicator Lamp (MIL) Method
The Malfunction Indicator Lamp (MIL) on the dashboard may also be used to retrieve the stored codes. This
method displays only the stored codes and does not allow any system investigation. It should only be used in
field conditions where a quick check of stored codes is needed.
Follow the directions given previously for performing the scan tool procedure. To activate the tests, use a
jumper wire to connect the signal return pin on the diagnostic connector to the Self−Test Input (STO)
connector. The self−test input line is the separate wire and connector with or near the diagnostic connector.
Codes are transmitted by place value with a pause between the digits; Code 32 would be sent as 3 flashes, a
pause and 2 flashes. A slightly longer pause divides codes from each other. Be ready to count and record
codes; the only way to repeat a code is to recycle the system. This method may be used to read either 2 or 3
digit codes. The Continuous Memory codes are separated from the other codes by 6 seconds, a single flash
and another 6 second delay.
EEC−IV EQUIPPED ENGINES
HOW TO USE THIS BOOK
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