Circuit Description
The PCM removes the ground from cruise control inhibit signal circuit when the PCM determines that conditions exist for which cruise should not be enabled. The PCM also monitors the voltage on this circuit in order to determine if a fault on the circuit exists.
Conditions for Running the DTC
| • | The engine speed is greater than 450 RPM. |
| • | The ignition is ON. |
| • | The system voltage is between 8 volts and 16 volts. |
Conditions for Setting the DTC
| • | The PCM detects that an improper voltage exists on the cruise control inhibit signal circuit. |
| • | The condition exists for at least 30 seconds. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store the conditions present when the DTC set as Failure Records data only. |
Conditions for Clearing the DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC will clear after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics | ||||
1 | Did you perform the Cruise Control Diagnostic System Check ? | -- | Go to Step 2 | |
2 |
Does the voltage measure near the specified value? | B+ | Go to Step 4 | Go to Step 3 |
3 | Test the cruise control inhibit signal circuit for an open, for a high resistance or for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 6 |
4 | Test the cruise control inhibit signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the cruise control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8 |
7 |
Important: Program the replacement PCM. Refer to Service Programming System (SPS) in Programming. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | -- | Go to Step 9 | -- |
8 | Replace the cruise control module. Refer to Cruise Control Module Replacement in Cruise Control. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
