Circuit Description
To control which direction the cruise control module moves the accelerator pedal the engine control module (ECM) commands the Cruise Control Servo Move Direction Signal circuit either high , wide open throttle (WOT) or low, idle. DTC P1582 will set if the ECM detects high feedback voltage when the Cruise Control Servo Move Direction Signal circuit should be low.
Conditions for Running the DTC
Every time the Cruise Control Servo Move Direction Signal circuit is commanded low, idle.
Conditions for Setting the DTC
| • | The ECM detects high feedback voltage when the Cruise Control Servo Move Direction Signal circuit is commanded high and the brake pedal is depressed. |
| • | The ECM detects high feedback voltage when the Cruise Control Servo Move Direction Signal circuit is commanded low. |
| • | The condition exists for 500 ms. |
Action Taken When the DTC Sets
| • | The ECM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
| • | To locate an intermittent problem, use a scan tool to perform Cruise Control Cycle special function with the ignition ON, engine OFF. The accelerator pedal should move to 50 percent throttle and then return to idle. If a short to ground exists the pedal will remain at rest or return to idle. |
| • | C/C Dir. Ckt.-High Volt and C/C Dir. Ckt.-Open test can be monitored to aid in diagnosing intermittent fault. If a fault exists, the scan tool will display Test Fail. |
| • | Loss of ground for the cruise control module can cause this DTC to set. If this condition exists DTC P01581 and P1587 will also set. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Connector End View Reference: Cruise Control Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Cruise Control? | Go to Step 2 | |
Does the Test Fail? | Go to Step 3 | Go to Diagnostic Aids | |
3 |
Does the Test Pass? | Go to Step 7 | Go to Step 4 |
4 | Is test light illuminated? | Go to Step 5 | Go to Step 6 |
5 | Inspect Cruise Control Servo Move Direction Signal circuit for short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the problem? | Go to Step 9 | -- |
6 | Inspect Cruise Control Servo Move Direction Signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the problem? | Go to Step 9 | Go to Step 8 |
7 | Replace the cruise control module. Refer to Cruise Control Module Replacement . Did you complete the repair? | Go to Step 9 | -- |
8 |
Important: The replacement ECM must be programmed. Replace ECM. Refer to Engine Control Module Replacement in Engine Controls. Did you complete the repair? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
