Displaying and Reading Trouble Codes
DESCRIPTION1. The Transmission Control Module (TCM) conducts a self-test of most of the wiring and components in the system each time the key is turned "ON". If a fault is detected the TCM will store a Diagnostic Trouble Code (DTC) in memory. It's a number that corresponds to a specific problem.
2. When the problem detected is important: the"CHECK TRANS" Indicator will flash (turned ON 0.2 seconds and "OFF" 0.2 seconds) until the fault is repaired and the TCM memory is cleared.
PROCEDURES
1. Diagnostic trouble Codes (DTCs) can be displayed by the Transmission Control Module (TCM) by shorting together Terminals 1 and 2 of the TCM Diagnosis Connector B-22 located left side of left front foot wall (see image ). This grounds the TCM Pin D16.
2. After this, the "CHECK TRANS" Indicator will be "OFF" for 3.2 seconds and then will flash each DTC three times.
a. When there are more than 9 flashes, this means that the Indicator is constantly flashing; "OFF" for 0.4 seconds, "ON" for 0.4 seconds. In this case there is no DTC stored in memory. To find the problem without a Scan Tool and without DTC, refer to Without DTC Set. Diagnosis Without DTC Set
b. When there are less than 9 flashes you will see DTC of 2 digits repeated 3 times each, and when all codes have been displayed they are displayed again beginning from the first one.
c. DTC order is unimportant: if "21" is before "22" it does not matter.
d. Write down all code numbers, then refer to DTC Check.
3. If "CHECK TRANS" Indicator is not flashing, refer to "CHECK TRANS" Check. Testing and Inspection