Circuit Description
The transmission control module (TCM) malfunction indicator lamp (MIL) request circuit signals the engine control module (ECM) that the TCM is requesting MIL illumination.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0802 Transmission Control Module (TCM) MIL Request Circuit
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTC P0802 runs once an ignition cycle. |
Conditions for Setting the DTC
The ECM is detecting an improper voltage level on the TCM MIL request circuit within 7 seconds of the key ON.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||
2 |
Does the DTC fail this ignition? | -- | Go to Step 3 | Go to Intermittent Conditions | ||||
3 |
Does the voltage measure near the specified value? | B+ | Go to Step 4 | Go to Step 5 | ||||
4 | Test the TCM MIL request circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6 | ||||
5 | Test the TCM MIL request circuit for an open and repair. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6 | ||||
6 |
Does DTC P0700 set, but not DTC P0802? | -- | Go to Step 7 | Go to Step 9 | ||||
7 | Perform the following procedures:
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | ||||
8 | Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the action? | -- | Go to Step 11 | -- | ||||
9 | Test the engine control module (ECM) connectors for a poor connection. Refer to Circuit Testing and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||
10 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- | ||||
11 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 12 | ||||
12 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK | ||||
