Circuit Description
The PCM has the ability to inhibit cruise control operation, if conditions exist that would make cruise control operation undesirable. The PCM will interrupt the ground on the cruise inhibit circuit to request that the cruise control be disengaged. The PCM also monitors the voltage on this circuit in order to determine if a fault exists.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The system voltage is between 9-16 volts. |
Conditions for Setting the DTC
| • | The PCM detects that an improper voltage exists on the cruise control inhibit signal circuit. |
| • | The above condition is present for at least 30 seconds. |
Action Taken When the DTC Sets
| • | The PCM does not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM stores the conditions which were present when the DTC set as Failure Records data only. This information is not stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
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 between C103 and the cruise control module. 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 an open, for a high resistance, or for a short to ground between C103 and the PCM. 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-3.4 L. Did you complete the replacement? | -- | Go to Step 9 | -- |
8 | Replace the cruise control module. Refer to Cruise Control Module Replacement . Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
