Circuit Description
The watchdog is a monitoring algorithm within the engine control module (ECM). The external watchdog will be triggered. If the external watchdog does not run out after 30 milliseconds then the fault will be detected.
Conditions for Setting the DTC
| • | The system voltage is too high or too low. |
| • | The transaxle input voltage is too high or too low. |
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The transmission control module (TCM) will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer. |
| • | Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control. |
| • | After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
| • | Power supply cut off to the PCS valve. |
Conditions for Clearing the MIL/DTC
| • | A MIL will turn OFF when the malfunction has not occurred after 3 ignition cycles. |
| • | A history DTC will clear after 40 consecutive warm-up cycles without a fault. |
| • | Using a scan tool can clear history DTCs. |
Diagnostic Aids
When DTC P0606 sets, the possible cause of the fault could be the TCM.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Automatic Transmission? | Go to Step 2 | |
2 |
Does the scan tool display DTC P1606? | Go to Step 3 | Go to Diagnostic Aids |
3 | Inspect the EF30 or F10 fuse for an open. Was a problem found? | Go to Step 4 | Go to Step 5 |
4 | Replace the fuse as necessary. Is the action complete? | System OK | -- |
5 |
Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect the wiring harness for an open between the fuses EF30 and F10 and the TCM terminals B3, C15, or C16. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
7 | Inspect the wiring harness for an open or a short to ground between the TCM terminals B12 or B13 and G103. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | Inspect the wiring harness for a short to power between terminals B12 or B13 and G103. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
9 | Replace the TCM. Refer to Transmission Control Module Replacement . Is the replacement complete? | Go to Step 10 | -- |
10 |
Does the scan tool indicate that this diagnostic has run and passed? | Go to Step 11 | Go to Step 2 |
11 | Check if any DTCs are set. Are any DTCs displayed that have not been diagnosed? | System OK |
