- Check whether the
indicator light indicates another code.
Does the indicator light indicate another code?
YES - Perform the Troubleshooting Flowchart for the indicated Code(s). Recheck for DTC 42 after troubleshooting. 
NO - Go to step 2.
- Check for deterioration in the quality of ATF.
Does ATF have deteriorated?
YES - Replace ATF (see page 14-320). Test-drive the vehicle under the same conditions the code was appeared, then recheck.
NO - Go to step 3.
- Measure the stall speed RPM in position (see page 14-315).
Is the stall speed over 3,500 rpm (min-1)?
YES - Replace the transmission.
NO - If the stall speed is below 2,000 rpm (min-1), replace the lower valve body assembly. If the stall speed is 2,000-3,500 rpm (min-1), go to step 4.
- Drive the vehicle at 30 mph (50 km/h) constantly for several minutes.
- Check the engine speed with respect to vehicle speed (see page 14-312).
Is the engine speed within the specification?
YES - Replace the lower valve body assembly.
NO - Replace the transmission.
