With Voltmeter

INSPECTION PROCEDURE USING VOLTMETER

Extracting Fault Codes With VOM:

READING DIAGNOSTIC CODES
1. Connect an analog voltmeter to the ground and the transmission self diagnosis output pin of the diagnostic connector.
2. Set the ignition switch to "ON".
3. Note the pattern of pulses displayed on the voltmeter. If the voltmeter indicates a steady voltage (either 0 volts or 12 volts) the transmission control module has failed.
4. Refer to the diagnostic codes chart to determine which device is causing the malfunction code.
5. Test and repair the offending components as necessary.
6. Clear the malfunction codes by disconnecting the vehicle battery negative terminal for 15 seconds or longer.
7. Road test the vehicle and recheck for newly stored diagnostic codes.

DIAGNOSTIC CODE INTERPRETATION
The transaxle control module monitors operation of the transaxle control system. Some components are monitored continuously, others only during specified operating conditions. When the transmission control module detects a malfunction lasting longer than a specified period of time the transmission control module will generate an error code that can be detected at the diagnostic connector.

There are 24 diagnostic items and 7 fail safe items that will generate codes. The codes are erased when the vehicle battery is disconnected for more than 15 seconds.

If multiple malfunctions occur the diagnostic trouble codes will be sent sequentially beginning with the lowest number code in ascending order with a 2 second pause between each code. A maximum of up to 10 diagnostic trouble codes can be stored in the transmission control module's memory. If the number of stored codes exceeds 10 previously stored codes will be erased beginning with the oldest code.

The voltmeter needle will deflect for a particular duration and a certain number of times.

EXAMPLES:

Code 13
The needle will deflect one time for approximately 0.5 second. This will represent one unit of ten. There will be approximately a one second delay and then the needle will deflect three times for approximately 0.2 seconds with 0.1 second delay between deflections. This will represent three units of one.

Code 23
The needle will deflect two times for approximately 0.5 second with approximately 0.3 second delay between deflections. This will represent two units of ten. There will be approximately a one second delay and then the needle will deflect three times for approximately 0.2 seconds with 0.1 second delay between deflections. This will represent three units of one.