Ranger 4WD V6-3.0L VIN U (1997)
General Module: Reading and Clearing Diagnostic Trouble Codes
Erasing Diagnostic Trouble Codes
Trouble codes are erased when either:
1. The ignition has been moved to the start position at any time during the diagnostic mode or
2. Power is removed from the Central Timer Module (CTM).
Interface
Central Timer Module Diagnostic Connector
The Central Timer Module (CTM) diagnostic mode is entered by grounding the dedicated diagnostic mode input. This one-pin connector is located
under the instrument panel. The diagnostic mode is exited (returned to normal operation) immediately upon removal of the ground on the diagnostic
mode input.
Retrieving Diagnostic Trouble Codes
The diagnostic mode is made up of the three following separate steps:
1. Tone and door ajar lamp test
2. Trouble code test
3. Input test
Step 1 is run immediately upon entry into the diagnostic mode.
Step 2 is run without the key in the ignition.
Step 3 is run with the key in the ignition.
The operator may switch between Steps 2 and 3 indefinitely until the diagnostic mode input is ungrounded.
Step 1 - Tone and Door Ajar Lamp Test
When the diagnostic mode is first entered, the CTM will generate a tone and light the door ajar lamp for three seconds. If the key is in the RUN or
ACCY position, use the following table to diagnose problems entering the diagnostic mode.
After the three-second test, the CTM will pause for one-second and then proceed to either Step 2 or Step 3 depending on whether the key is in the
ignition.