Diagnostics

Diagnostics

Special Tools:

Self Diagnosis Function
The transmission control module (TCM) monitors the communication status of each sensor, electronic component and the powertrain control module (PCM). If any malfunction should occur, the TCM function warns the driver and stores the malfunction as a diagnosis code.

Fail-Safe
With the fail-safe function, if any malfunction should occur in the automatic transmission system, the TCM will output a control signal, and control will be carried out to make traveling a minimum distance possible. If all shift solenoids malfunction, the TCM will cancel the output of control signals to the solenoids. If this happens, the automatic transmission gear shifting will be controlled by fluid pressure circuits only and the gears will shift as shown in the following table.





On-Board Diagnostic With Scan Tool

NOTE: For detailed instruction and other diagnostic methods using the scan tool or equivalent, refer to the scan tool tester manual and the Computers and Controls System.

These Quick Tests should be used to diagnose the powertrain control module (PCM) and should be carried out in order.
- Quick Test 1.0 - Visual Inspection
- Quick Test 2.0 - Set Up
- Quick Test 3.0 - Key On, Engine Off (KOEO)
- Quick Test 4.0 - Continuous Memory Codes
- Quick Test 5.0 - Key On, Engine Running (KOER)
- Special Test Modes
^ Wiggle Test Mode
^ Output Test Mode
- PCM Reset Mode
- Clearing DTC's P1000
- OBD II Drive Cycle
- Other scan tool features